Agrosystems, Geosciences & Environment最新文献

{"title":"Adaptability and productivity evaluation of Desho grass (Pennisetum pedicellatum) varieties under Bako condition, Western Oromia, Ethiopia","authors":"Wakgari Keba,&nbsp;Mekonen Diribsa,&nbsp;Abuye Tulu","doi":"10.1002/agg2.70174","DOIUrl":"10.1002/agg2.70174","url":null,"abstract":"<p>Adaptability evaluation is a primary step in introducing new varieties (either forage or food crops) from their place of release to another new environment for further studies. This study was conducted in 2022 and 2023 to identify the best adaptable and highest herbage-yielding Desho grass variety/s. The treatment consists of four Desho grass varieties (Kindu Kosha-DZF-591, Kulumsa-DZF-592, Kindu Kosha-DZF-589, and Areka-DZF-590) arranged in a randomized complete block design with three replications. This study showed that Desho grass varieties varied significantly in most of the measured parameters across all sites. The highest plant height (74.00 cm) for Areka-DZF-590 at Bako was recorded; statistically similar higher tillers per plant (TPP) were recorded for Kulumsa-DZF-592 (34.80), Kindu kosha-DZF-589 (38.60), and Areka-DZF-590 (39.9). The highest dry matter yield (DMY) was obtained from Areka-DZF-590 (27.25 t ha⁻¹), followed by Kindu kosha-DZF-589 (21.97 t ha⁻¹), Kulumsa-DZF-592 (21.49 t ha⁻¹), and Kindu kosha-DZF-591 (19.46 t ha⁻¹). Tillering ability and forage DMY were among the traits of greater interest in this study. Even though there were some differences in some of the measured parameters, all the varieties produced a similar large number of TPP and DMY in all the sites. Generally, among the varieties of Desho grass tested in this study, Areka DZF # 590 was superior in producing the highest DMY and TPP during the experimental years. Thus, it is recommended that this variety be demonstrated and familiarized to the farming community to lessen the existing feed shortage in the study area.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing promiscuous traits in soybean genotypes at Bako, Western Ethiopia","authors":"Alemayehu Dabesa,&nbsp;Feyera Takele","doi":"10.1002/agg2.70162","DOIUrl":"10.1002/agg2.70162","url":null,"abstract":"<p>Soil acidity challenges specific <i>Bradyrhizobium japonicum</i> bacteria that soybean [<i>Glycine max</i> L. (Merrill)] varieties require for effective nodulation and nitrogen fixation. Thus, promiscuous soybean varieties or genotypes that can form root nodules with a wide range of indigenous rhizobial bacteria are essential in areas where specific <i>Bradyrhizobium japonicum</i> inoculants may not be readily available. Therefore, this study was conducted to evaluate promiscuous soybean genotypes for effective nodulation, yield, and yield-related traits as potential materials for subsequent breeding work in Bako, Western Ethiopia. One hundred ninety-six promiscuous soybean genotypes were laid out in a partially balanced (simple lattice) design with two replications. The results showed that days to 50% flowering, days to maturity, nodule number, plant height, number of primary branches per plant, number of pods per plant, number of seeds per pod, hundred seed weight, grain yield, bacterial blight, bacterial pustule, and frog eye leaf spot (<i>p</i> &lt; 0.01) varied significantly among the evaluated soybean genotypes. The grain yield of the evaluated soybean genotypes ranged from 1141.8 to 4235.1 kg ha⁻¹. These variable yield responses observed are due to differences in genetic potential, physiological characteristics, growth habits, and maturity differences of the evaluated soybean genotypes. Principal component analysis revealed that plant height, the number of primary branches, the number of nodules, the number of pods per plant, and grain yield are correlated parameters. K-means clustering was used to identify genotypes with similar characteristics. Therefore, 60 promiscuous soybean genotypes were selected and promoted to the next breeding stage based on their nodulation characteristics and yield potential. Thus, from this study, it can be concluded that selecting and promoting soybean genotypes based on their promiscuous nature is one strategy to improve soybean yield, especially where an effective <i>Bradyrhizobium japonicum</i> strain is not available to the farmers.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70162","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Termination strategies for high biomass cereal rye cover crop in soybean planting green systems","authors":"Jacob H. Felsman,&nbsp;Ahmadreza Mobli,&nbsp;Jose J. Nunes,&nbsp;Ryan P. DeWerff,&nbsp;David E. Stoltenberg,&nbsp;Christopher A. Baxter,&nbsp;Rodrigo Werle","doi":"10.1002/agg2.70163","DOIUrl":"10.1002/agg2.70163","url":null,"abstract":"<p>Weed management programs utilizing high-biomass cereal rye (<i>Secale cereale</i> L.) cover crop in Wisconsin soybean [<i>Glycine max</i> (L.) Merr.] production systems are increasing in popularity. Much of this method's success depends on effective cereal rye termination and environmental conditions in the spring. A randomized complete block design field experiment was conducted in 2021 and 2022 at the University of Wisconsin-Madison Arlington Agricultural Research Station in southern Wisconsin designed to determine the efficacy of chemical (glyphosate, clethodim, and quizalofop-P-ethyl) and mechanical (McFarlane roller-crimper) techniques and combinations thereof for termination of high biomass cereal rye cover crop and their impact on yield in planting green soybean systems. The control treatment was glyphosate applied pre-plant (preplant control). Glyphosate-containing treatments were the most effective in percent control of terminated cereal rye 21 days after soybean planting in both years (2021: &gt;98%, 2022: &gt;99%) compared to roller-crimping (2021: &lt;49%, 2022: &gt;96%), the ACCase inhibitors clethodim and quizalofop-P-ethyl (2021: &lt;29%, 2022: &lt;85%), roller-crimper + clethodim (2021: &lt;66%; 2022: 99%), and roller-crimper + planting green quizalofop-P-ethyl (2021: &lt;63%). Soybean stand densities in planting green clethodim (&lt;27%) and planting green quizalofop-P-ethyl (&lt;18%) treatments were less than the pre-plant control in both years. Soybean stand density was not affected by other treatments. Soybean yields in both years were greater in the pre-plant control treatment (2021: 5454 kg ha⁻¹ and 2022: 3912 kg ha⁻¹) than other treatments except for the roller-crimper + planting green glyphosate treatment (2021: 5137 kg ha⁻¹ and 2022: 3541 kg ha⁻¹). Planting green glyphosate, roller-crimper, and all chemical + mechanical combinations did not differ from each other in yield for 2022. This study found that roller-crimper + planting green glyphosate was equivalent to the pre-plant control, and both were followed by planting green glyphosate as the best termination techniques for controlling a high biomass cereal rye cover crop and protecting yield potential in planting green soybean systems.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wheat straw incorporation enhances paddy soil quality: Evidence from a pot experiment","authors":"Wei Dai,&nbsp;Peirong Lu,&nbsp;Xi Zhang","doi":"10.1002/agg2.70159","DOIUrl":"10.1002/agg2.70159","url":null,"abstract":"<p>Evaluating soil quality under various management practices in agroecosystems is crucial for understanding soil functioning. In this study, a soil quality index (SQI) was developed to assess the impact of wheat straw incorporation on soil quality. Several soil attributes, either sensitive or insensitive to straw incorporation, were quantified in a pot experiment, and factor analysis was applied as a dimension reduction technique. Samples were taken from 0–20 cm depth in paddy soil, with treatments including no-fertilizer control and wheat straw incorporation at rates of 0%, 50%, 100%, and 150% under combined NPK fertilization. The wheat straw used in this study was obtained from a rice–wheat rotation system. Soil properties, including physical (mean weight diameter), chemical (organic carbon, total nitrogen, ratio of organic carbon and total nitrogen, and particulate organic carbon), and biological (microbial biomass carbon and nitrogen, and three enzymes) parameters, were measured to create a minimum data set for the SQI evaluation. Results suggested a significant improvement in SQI under 100%S treatment. While the 100%S treatment enhanced most soil microbial attributes, not all of them contributed to SQI due to their interrelationships. Only geometric mean of microbial biomass (GMB) and geometric mean of enzyme activity (GME) were critical for the SQI, collectively contributing 56.97%. Thus, GMB and GME were essential indicators for distinguishing between straw management systems and could be employed to monitor improvements in soil quality under 100%S treatment. Taken together, the 100%S treatment showed the highest SQI, indicating improved soil capacity and functions compared to the control. Smallholder farmers should consider the 100%S treatment for enhanced soil quality in paddy ecosystems.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70159","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of biochar-based inoculant in enhancing rhizobia survival and grain yield of cowpea (Vigna unguiculata (L.) Walp.)","authors":"Winnefred Mensah,&nbsp;Nana Ewusi-Mensah,&nbsp;Jacob Ulzen,&nbsp;Ophelia Osei Ulzen,&nbsp;Azumah Ayamah","doi":"10.1002/agg2.70161","DOIUrl":"10.1002/agg2.70161","url":null,"abstract":"<p>The need for low-cost carrier materials is paramount for rhizobium inoculants production, especially in sub-Saharan Africa. This research studied different feedstocks biochar as potential carriers for inoculant production. Coconut coir (CC), coconut shell (CS), rice husk (RH), and sugarcane bagasse (SB) biochars were used as carriers, and their performance was compared to that of standard industrial peat (control). The biochar and peat carriers were inoculated with two elite <i>Bradyrhizobium</i> strains such as KNUST 1002 and KNUST 1006 and the reference strain BR 3267 (where BR is <i>Bradyrhizobium</i>). The survival rate of the rhizobia was monitored by determining the number of cells, pH, and moisture content for 24 weeks. In addition, the effectiveness of different inoculated carriers was tested in cowpea (<i>Vigna unguiculata</i> (L.) Walp) under field conditions via a randomized complete block design with four replications. CC and SB enhanced <i>Bradyrhizobium</i> survival for up to 16 and 20 weeks, respectively, whereas CS and RH promoted strain survival for up to 8 weeks. The viable cell count was highest in the peat-based inoculant during the 24-week period. BR 3267 in CC and SB significantly (<i>p</i> &lt; 0.001) increased the nodule dry weight of cowpea compared to uninoculated control. The highest grain yield (1774 kg ha⁻¹) was recorded for CC, which was 16% greater than the grain yield of the peat-based inoculant (1524 kg ha⁻¹), although this difference was not significant. CC biochar is a potential carrier for inoculant production in Ghana.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70161","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated nutrient management for maize phenology and growth performance: Biochar, vermicompost, and N-P nutrients in northwestern Ethiopia","authors":"Habtamu Tadele,&nbsp;Tesfaye Feyisa,&nbsp;Lewoye Tsegaye,&nbsp;Sintayehu Musie","doi":"10.1002/agg2.70158","DOIUrl":"10.1002/agg2.70158","url":null,"abstract":"&lt;p&gt;Maize phenological and vegetative growth in the Nitisols of Burie District is hindered by issues such as high soil compaction (bulk density &gt; 1.40 g cm&lt;sup&gt;−3&lt;/sup&gt;), low total soil porosity (&lt;50%), low total nitrogen (2.5 g kg&lt;sup&gt;−1&lt;/sup&gt;), low organic carbon (2.11%), strong acidity (pH 4.94), and very low available phosphorus (11.69 mg kg&lt;sup&gt;−1&lt;/sup&gt;). To address these challenges, a 2-year field experiment was conducted at Burie Campus research site in 2023–2024 and 2024–2025, Burie district, northwestern Ethiopia. The study evaluated the combined effects of inorganic N/P₂O₅ nutrients, maize cob biochar (BC), and vermicompost (VC) on the phenological and growth performance of maize. The randomized complete block design (RCBD) experiment included three replications and three factors, each with three levels: (1) N/P₂O₅ nutrients (N₀P₀ [none], N₁P₁ [120/69 kg ha&lt;sup&gt;−1&lt;/sup&gt;], and N₂P₂ [240/138 kg ha&lt;sup&gt;−1&lt;/sup&gt;]); (2) BC (BC₀ [none], BC₁ [4 t ha&lt;sup&gt;−1&lt;/sup&gt;], BC₂ [8 t ha&lt;sup&gt;−1&lt;/sup&gt;]); and (3) VC rate (VC₀ [none], VC₁ [0.5 of the recommendation], VC₂ [full recommendation]). The results showed that a combined application of N&lt;sub&gt;2&lt;/sub&gt;P&lt;sub&gt;2&lt;/sub&gt;, BC&lt;sub&gt;2&lt;/sub&gt;, and VC&lt;sub&gt;2&lt;/sub&gt; led to earlier emergence (E) and phenological stages. Plants reached 50%E in just 8.13 days, 50% tasseling (T) in 95.28 days, and 50% silking (S) in 103.5 days. The maximum days to 50%E (10.69) were observed with N&lt;sub&gt;2&lt;/sub&gt;P&lt;sub&gt;2&lt;/sub&gt;, followed by N&lt;sub&gt;1&lt;/sub&gt;P&lt;sub&gt;1&lt;/sub&gt; (10.24 days). However, the longest days to 50%T were recorded from the control (101.7 days). Similar to days to 50%T, the longest days to get 50%S were recorded from the control plot (112.67). The tallest plant height (PH) at 30 days after emergence (DAE) (18.49 cm) was achieved with N&lt;sub&gt;1&lt;/sub&gt;P&lt;sub&gt;1&lt;/sub&gt;, BC₀, and VC&lt;sub&gt;2&lt;/sub&gt;. At 60 DAE, the tallest PH (113.23 cm) was observed with N₂P₂, BC₀, and VC&lt;sub&gt;2&lt;/sub&gt;. At 90 DAE, the maximum PH (296.3 cm) resulted from N&lt;sub&gt;1&lt;/sub&gt;P&lt;sub&gt;1&lt;/sub&gt;, BC₀, and VC&lt;sub&gt;1&lt;/sub&gt;. In contrast, the shortest PHs of 11.10 cm, 44.05 cm, and 148.32 cm were recorded in the control plots at 30, 60, and 90 DAE, respectively. Based on 2 years data, at 30 DAE, the maximum number of leaves per plant (NLPP) (7.50) was documented from the combined application of N&lt;sub&gt;2&lt;/sub&gt;P&lt;sub&gt;2&lt;/sub&gt;, BC&lt;sub&gt;2&lt;/sub&gt;, and VC&lt;sub&gt;2&lt;/sub&gt;. While at 60 DAE, the maximum NLPP (12.80) was recorded from the combined application of N&lt;sub&gt;2&lt;/sub&gt;P&lt;sub&gt;2&lt;/sub&gt;, BC&lt;sub&gt;2&lt;/sub&gt;, and VC&lt;sub&gt;0&lt;/sub&gt;. At 90 DAE, the maximum NLPP (17.39) was obtained from the combined application of N&lt;sub&gt;1&lt;/sub&gt;P&lt;sub&gt;1&lt;/sub&gt;, BC&lt;sub&gt;1&lt;/sub&gt;, and VC&lt;sub&gt;2&lt;/sub&gt;. However, the lowest NLPP 5.35, 6.54, and 12.35 was documented from the control at 30, 60, and 90 DAE, respectively. Moreover, a strong positive correlation was observed between days to 50% tasseling and silking (&lt;i&gt;r&lt;/i&gt; = 0.86; &lt;i&gt;p&lt;/i&gt; &lt; 0.01) and between PH and the NLPP at 30 DAE (&lt;i&gt;r&lt;/i&gt; = 0.84; &lt;i&gt;p&lt;/i&gt; &lt; 0.01). In conclusi","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70158","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic diversity and population structure analysis of Pisum sativum var. abyssinicum genotypes from Northern Ethiopia using ISSR markers","authors":"Gebru Equar Gebremichael,&nbsp;YemaneTsehaye Bayratsion,&nbsp;Fetien Abay Abera,&nbsp;Yemane G. Egziabher,&nbsp;Desta Berhe Sbhatu,&nbsp;Kassahun Tesfaye,&nbsp;Tilahun Mekonnen,&nbsp;Genet Atsbeha","doi":"10.1002/agg2.70151","DOIUrl":"10.1002/agg2.70151","url":null,"abstract":"<p><i>Pisum sativum</i> var. <i>abyssinicum</i> is a globally important legume crop, and its genetic diversity is vital for crop improvement, sustainable agriculture, and biodiversity conservation. This study investigated the genetic variability and population structure of <i>P. sativum</i> var. <i>abyssinicum</i> genotypes from Northern Ethiopia using inter simple sequence repeat (ISSR) markers. A total of 120 genotypes from five geographically based populations were analyzed using 12 ISSR primers. Scorable bands ranged from 443 to 1298, with an average of 815.75 per primer. Primer UBC-880 (where UBC is University of British Columbia) produced the most bands (1298), while UBC-841 generated the highest number of polymorphic bands (421), indicating its effectiveness in detecting genetic diversity. Genetic analysis showed that 84% of variation occurred within populations, with only 16% between them, suggesting greater diversity among individuals of the same population. Factors like gene flow, mutation, and natural selection may contribute to this internal variability. The highest Nei's genetic distance (0.468) was observed between populations SET and R, suggesting strong differentiation, while the lowest (0.06) was between NW and SET, indicating close genetic similarity. Principal coordinate analysis (PCoA) revealed that the ST population was distributed across all three clusters, reflecting genetic similarities with other populations. Four genetically distinct clusters were identified using UPGMA clustering. South Tigray showed the greatest genetic variability. Despite its unique traits and historical importance, the genetic variability of <i>P. sativum</i> var. <i>abyssinicum</i> remains underexplored. This study provides essential insights for breeding and conservation, supporting the use of ISSR markers to guide genetic improvement and preservation strategies.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temporal changes in soil organic carbon and other near-surface soil properties under native tallgrass prairie in the Arkansas River Valley","authors":"Katie Jansson,&nbsp;Kristofor R. Brye,&nbsp;Mike Richardson,&nbsp;Lisa S. Wood","doi":"10.1002/agg2.70155","DOIUrl":"10.1002/agg2.70155","url":null,"abstract":"<p>One climate-change mitigation pathway is soil carbon (C) sequestration. Native prairies have long been known for their soil C sequestration abilities, but the full extent of their sequestration capacity is not completely understood, particularly across diverse regions. This study evaluated the effects of soil depth and soil map unit-prairie combination on changes in various soil properties from 2018 to 2022 in the top 20 cm of two native tallgrass prairies in west-central Arkansas. Soil bulk density, pH, electrical conductivity, total nitrogen, total C (TC), soil organic matter (SOM), and Mehlich-3 extractable soil nutrients were evaluated from the 0- to 10-cm and 10- to 20-cm depths in six soil map units across the two prairie ecosystems. Results indicated that soil pH was greater (<i>p</i> &lt; 0.05) in 2022 than in 2018 in all six soil map unit-prairie combinations, but remained acidic, averaging 5.1 in the top 10 cm. Soil organic matter was lower (<i>p</i> &lt; 0.05) in 2022 than in 2018 in all soil depth–prairie combinations, ranging from −11.3 to 11.3 Mg ha⁻¹ in the 0–10 cm of one combination to 3.3 Mg ha⁻¹ in the 10- to 20-cm depth of a different combination. Averaged across soil map unit-prairie combination, soil TC was lower (<i>p</i> &lt; 0.05) in 2022 than in 2018 in both soil depths. Results showed that soil C sequestration did not occur during the 4-year study period, potentially meaning that the prairies have already reached an equilibrium soil C content and may not continue to sequester soil C indefinitely.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70155","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating leaf phosphorus concentration in rice by combining vegetation indices, texture features, and water indices from UAV multispectral imagery","authors":"Canh Van Le,&nbsp;Lan Thi Pham","doi":"10.1002/agg2.70160","DOIUrl":"10.1002/agg2.70160","url":null,"abstract":"<p>Leaf phosphorus (P) concentration is a key factor that reflects the growth of rice <i>(Oryza sativa)</i>, affecting both the quality and productivity of the crop. The estimation of leaf P concentration using unmanned aerial vehicle (UAV) remote sensing plays a pivotal role in fertilization management, monitoring rice growth, and advancing precision agriculture strategies. This study aimed to integrate vegetation indices (VIs), texture features (TFs) indices, and water indices (WIs) obtained from UAV multispectral images to estimate leaf P concentration in rice using the multi-criteria evaluation (MCE) model with analytical hierarchy process–based weights. The MCE method was employed to integrate the 16 VIs, eight TFs, and two WIs with four scenarios (S1, S2, S3, and S4) to evaluate their contributions to estimating the rice leaf P concentration. The S1 integrates the normalized difference vegetation index (NDVI), the modified chlorophyll absorption in reflectance index (MCARI), and the mean (MEA). The S2 extends S1 by incorporating the normalized difference water index (NDWI), while S3 combines the indices from S1 with NIR shoulder region index (NSRI). Finally, S4 integrates NDVI, MCARI, MEA, NDWI, and NSRI. The S4, which integrates all VIs, TFs, and WIs, provides the highest accuracy in estimating leaf P concentration with root mean square error values of 0.035. The research findings indicate that leaf P concentration differs between the two rice varieties, TBR225 and J02. The J02 variety exhibits a higher leaf P concentration than the TBR225 variety, as it is more efficient in P synthesis. The results of this study provide an effective foundation for developing solutions in rice nutrition management, with a focus on advancing precision agriculture.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Agronomic effectiveness of nitrogen and phosphorus recovered from swine manure","authors":"Wooiklee S. Paye,&nbsp;Raul Moral,&nbsp;Matias B. Vanotti,&nbsp;Ariel A. Szögi,&nbsp;Quentin D. Read","doi":"10.1002/agg2.70153","DOIUrl":"10.1002/agg2.70153","url":null,"abstract":"<p>New technologies have been developed to extract and recover manure nitrogen (N) and phosphorus (P) that can be upcycled as substitutes for conventional fertilizers. Yet, there are uncertainties over the agronomic effectiveness of these recovered nutrients. In a greenhouse study, we evaluated annual ryegrass (<i>Lolium multiflorum</i> Lam.) response to recovered N (RN), conventional N (CN), recovered P (RP), and conventional P (CP) in four nutrient combinations: CN + CP, RN + CP, CN + RP, and RN + RP at five N rates: 0, 23, 46, 92, and 184 mg N kg⁻¹ soil; and three P rates: 0, 39, and 78 mg P kg⁻¹ soil. Results showed a synergistic response to N and P, where dry matter yield and nutrient uptake increased with both nutrients application. Under CP, ryegrass supplied with 92 and 184 mg N kg⁻¹ of CN produced 16%–35% more dry mass yield than RN. In contrast, ryegrass dry mass yield under RP was 17%–114% greater with RN than CN. Ryegrass dry mass yield under CP was 17% greater with CP than RP at 78 mg P kg⁻¹ soil, but RP produced 27%–66% more dry mass yield than CP under RN. There was no difference in soil inorganic N between the two N sources, but Mehlich-1 soil test P was less in RP than CP treated soil. The combination of RN and RP was an effective fertilizer blend for substituting CN and CP. This finding is critical for the advancement of the new circular nutrient economy.</p>","PeriodicalId":7567,"journal":{"name":"Agrosystems, Geosciences & Environment","volume":"8 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/agg2.70153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}