Revista Caatinga最新文献_第9页

Control of hairy fleabane in sequential and pre-emergence applications in soybean crops 在大豆作物上序贯和苗期前施用毛麻的防治

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n402rc

Paulo V. da Silva, Daniela M. de Barros, Edson R. Domingos, Patrícia A. Monquero, Roque de C. Dias, Marlon A. Vendruscolo

{"title":"Control of hairy fleabane in sequential and pre-emergence applications in soybean crops","authors":"Paulo V. da Silva, Daniela M. de Barros, Edson R. Domingos, Patrícia A. Monquero, Roque de C. Dias, Marlon A. Vendruscolo","doi":"10.1590/1983-21252023v36n402rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n402rc","url":null,"abstract":"ABSTRACT The control of Conyza spp. can be conducted at different times in the soybean crop. This study aimed to evaluate the efficiency of controlling Conyza spp. by positioning herbicides at different times and their selectivity in the soybean crop. The experiment was conducted under field conditions in a randomized block design with four replications. A first application of 2.4-D + glyphosate (975 + 1500 g of active ingredient [a.i.] ha-1) was conducted, followed by the following treatments: glufosinate (500 g i.a. ha-1), diquat (400 g a.i. ha-1), and saflufenacil + glyphosate (50 + 1500 g a.i. ha-1 ) and a third application of the pre-emergents flumioxazin + imazethapyr (60 + 127 g i. a. ha-1), sulfentrazone + diuron (210 + 420 g a.i. ha-1), diclosulam (35 g a.i. ha-1), and s-metolaclhor (1440 g a.i. ha-1), in addition to the control treatment. High percentages of control were obtained with saflufenacil + glyphosate and diquat. Glufosinate provided satisfactory control seven days after the treatment (DAT) application, with regrowth throughout the evaluations, except when diclosulam was applied. The pre-emergent herbicides reduced the emergence of Conyza spp. resulting in 0.25 plants m-2 when flumioxazin + imazethapyr was applied at 28 DAT. Regardless of the treatment, the soybean crop had no significant phytotoxicity. The management of Conyza spp. with the positioning of herbicides at different times proved to be more efficient when the sequential use of diquat and/or saflufenacil + glyphosate and flumioxazin + imazethapyr in pre-emergence was carried out.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphophysiology and inorganic solutes in watermelon irrigated with brackish water in different planting systems 微咸水灌溉西瓜在不同种植制度下的形态生理及无机溶质

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n411rc

Francisco B. da Silva Junior, Claudivan F. de Lacerda, Geocleber G. de Sousa, Jonnathan R. da S. Sales, Andreza de M. Mendonça

{"title":"Morphophysiology and inorganic solutes in watermelon irrigated with brackish water in different planting systems","authors":"Francisco B. da Silva Junior, Claudivan F. de Lacerda, Geocleber G. de Sousa, Jonnathan R. da S. Sales, Andreza de M. Mendonça","doi":"10.1590/1983-21252023v36n411rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n411rc","url":null,"abstract":"ABSTRACT Irrigation with brackish water reduces watermelon yield in the Brazilian semiarid region, requiring the establishment of management strategies that reduce the negative impacts caused by salt stress. The objective of this study was to evaluate the morphophysiology and concentration of inorganic solutes in watermelon crops subjected to different electrical conductivities of the irrigation water, using hardened seedlings or direct sowing. The experiment was conducted in the Baixo Acarau Irrigated Perimeter, in the state of Ceara, Brazil. A randomized complete block design was used, with split plots and four replications. The plots consisted of four electrical conductivity levels of the irrigation water (0.3, 1.5, 3.0, and 4.5 dS m-1), and the subplots consisted of three planting systems: DS = direct sowing; TP1 = transplanting of seedlings produced with moderate-salinity water (1.5 dS m-1), and TP2 = transplanting of seedlings produced with low-salinity water (0.3 dS m-1). The following variables were analyzed: vegetative growth, leaf gas exchange, and inorganic solutes. The use of watermelon seedlings produced with moderate-salinity water does not result in higher salt tolerance during the vegetative growth stage. Na+, Cl-, and Ca2+ leaf concentrations increase as the salt stress level is increased, regardless of the planting method. However, plants from seedlings (TP1 and TP2) have higher Na+ and Cl- concentrations when subjected to high salinity levels. The direct sowing method resulted in better performance of growth variables, mainly under low salinity levels.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135310792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of morphophysiological and genotypic diversity of endophytic bacteria isolated from rice (Oryza sativa L.) plants 水稻内生细菌形态、生理和基因型多样性评价

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n405rc

Lucas Leonardo-Silva, Larissa B. da Silva, Enderson P. de B. Ferreira, Karina F. D. N. S. dos Reis, Plínio L. F. Naves, Claudia C. G. Martin-Didonet (in memoriam)

{"title":"Assessment of morphophysiological and genotypic diversity of endophytic bacteria isolated from rice (Oryza sativa L.) plants","authors":"Lucas Leonardo-Silva, Larissa B. da Silva, Enderson P. de B. Ferreira, Karina F. D. N. S. dos Reis, Plínio L. F. Naves, Claudia C. G. Martin-Didonet (in memoriam)","doi":"10.1590/1983-21252023v36n405rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n405rc","url":null,"abstract":"ABSTRACT Rice production in Brazil incurs high costs due to the significant use of agrochemicals. Some plant growth-promoting rhizobacteria (PGPR) can be used as alternative to fertilizers and phytosanitary products. Thus, the objective of this study was to characterize endophytic bacteria isolated from roots of rice plants. The isolates were characterized based on colony morphology, antibiotic resistance, carbon sources utilization, enzyme activity (catalase, amylase, protease, cellulase, and lipase), inorganic phosphate solubilization, and the 16S-23S rDNA intergenic region. Morphologically, 68% of the isolates presented a rapid growth rate, 46% presented abundant mucus production, and 77% formed viscous colonies. All isolates were resistant to nalidixic acid and 16% presented resistance to streptomycin. The majority (90%) used monosaccharides and disaccharides in carbon source assays. Most of the isolates (95%) were positive for catalase and 63.6% were positive for amylase, protease, lipase, and cellulase activities. Additionally, 59% of them were able to solubilize phosphate. The mean enzymatic index for amylase, cellulase, and protease was 2.8, 3.5, and 1.7 respectively. The similarity analysis revealed high diversity among the isolates, with similarity indices of 70% (based on morphological characteristics) and 60% (based on the intergenic region 16S-23S rDNA). Considering morphophysiological and genotypic characteristics, three promising isolates should be evaluated in studies under field conditions for the potential development of bioproducts to replace industrially manufactured inputs in rice crops.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135317839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of glyphosate-based products applied alone and in combination with herbicides in burndown 草甘膦基产品单独使用和与除草剂联合使用在烧毁中的性能

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n404rc

Bruno C. S. Pereira, Guilherme B. P. Braz, Matheus de F. Souza, Laís T. R. T. Reginaldo, Camila J. B. Ferreira

{"title":"Performance of glyphosate-based products applied alone and in combination with herbicides in burndown","authors":"Bruno C. S. Pereira, Guilherme B. P. Braz, Matheus de F. Souza, Laís T. R. T. Reginaldo, Camila J. B. Ferreira","doi":"10.1590/1983-21252023v36n404rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n404rc","url":null,"abstract":"ABSTRACT The no-tillage system is a conservation system that helps sustainability and agricultural production. The effectiveness of glyphosate control, applied alone or in combination with other herbicides, can be altered depending on the product’s formulation. The objective of the present study was to evaluate the effectiveness of glyphosate in formulations containing different salts and concentrations, applied alone and in combination with other herbicides, in controlling weeds in advanced stages in the pre-sowing burndown operation. The experiment was carried out in the field in an area with a history of high weed infestation. The experiment was conducted in a randomized block design, evaluating eleven treatments and four replicates. The treatments consisted of the application of three glyphosate-based formulations alone and in combination with clethodim and 2,4-D amine herbicides, in addition to a control without herbicide application. The evaluated variables were percentage of weed control and percentage of desiccation. A comparison of means by contrasts was performed to analyze the percentage of weed control. In general, treatments containing products based on glyphosate potassium salt in the composition have slightly better control performance compared to those consisting of glyphosate isopropylamine salt.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Agronomic performance of cowpea cultivars inoculated with rhizobia in the brazilian semiarid region 巴西半干旱区接种根瘤菌豇豆品种的农艺性能

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n406rc

Pedro R. H. de Oliveira, Welder de A. R. Lopes, Flávio P. da M. Silveira, Manoel G. dos Santos, Gisele L. dos Santos, Silvana F. da Silva, Lindomar M. da Silveira, Aurélio P. Barros Júnior

{"title":"Agronomic performance of cowpea cultivars inoculated with rhizobia in the brazilian semiarid region","authors":"Pedro R. H. de Oliveira, Welder de A. R. Lopes, Flávio P. da M. Silveira, Manoel G. dos Santos, Gisele L. dos Santos, Silvana F. da Silva, Lindomar M. da Silveira, Aurélio P. Barros Júnior","doi":"10.1590/1983-21252023v36n406rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n406rc","url":null,"abstract":"ABSTRACT This work aimed to evaluate the agronomic efficiency of cowpea cultivars inoculated with rhizobia strains recommended for cowpea in a semiarid environment. Experiments were carried out in Mossoró, Rio Grande do Norte, in two agricultural cycles: the first from January to April 2019, and the second from June to August of the same year. The experimental design adopted was randomized blocks with four replications arranged in a 4 × 4 x 2 factorial scheme, with treatments consisting of four cowpea cultivars: ‘BRS Imponente’, ‘BRS Itaim’, ‘BRS Novaera’, and ‘BRS Tumucumaque’ as well as three sources of N, two strains of Bradyrhizobium spp. registered for cowpea (BR 3262 and BR 3267) and, the application of mineral N (50 kg ha-1), beyond an absolute control, without inoculation or application of mineral N. In addition to two planting seasons. The cultivar ‘BRS Tumucumaque’ showed greater productive potential. The inoculation of cowpea seeds with Bradyrhizobium strains BR 3262 and BR 3267 provided grain yields similar to those obtained with the application of mineral N.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135261473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production of guava seedlings with increasing water salinity and nitrogenpotassium fertilizations 提高水盐度和氮钾施肥条件下番石榴幼苗的生产

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n420rc

Ricardo A. Rodrigues Filho, Reginaldo G. Nobre, Geovani S. de Lima, Francimar M. da S. Moraes, Lauriane A. dos A. Soares, Antonio D. da S. Teixeira, Tayd D. C. Peixoto, Emanoel dos S. Vasconcelos

{"title":"Production of guava seedlings with increasing water salinity and nitrogenpotassium fertilizations","authors":"Ricardo A. Rodrigues Filho, Reginaldo G. Nobre, Geovani S. de Lima, Francimar M. da S. Moraes, Lauriane A. dos A. Soares, Antonio D. da S. Teixeira, Tayd D. C. Peixoto, Emanoel dos S. Vasconcelos","doi":"10.1590/1983-21252023v36n420rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n420rc","url":null,"abstract":"ABSTRACT Salt stress affects the development of several crops, being one of the limiting factors for irrigated agriculture in the semiarid region, where nitrogen and potassium fertilization can be an alternative for agricultural production. This study aimed to evaluate the viability of using water with different salinities associated with varying amounts of nitrogen and potassium fertilization in the production of seedlings of the guava cultivar Paluma in an experiment conducted in experimental areas of the Federal Rural University of the Semi-arid Region (UFERSA), campus of Caraúbas. The research was carried out from February to June 2021. The study was set up in a randomized block design and analyzed in a 5 × 4 factorial scheme with four replicates, and two plants per plot. Treatments were established by combining different levels of electrical conductivity of the irrigation water (ECw): 0.3, 1.1, 1.9, 2.7, and 3.5 dS m-1, with Combinations (C) of nitrogen (N) and potassium (K2O) levels of recommended fertilization: C1 = 70% N + 50% K2O, C2 = 100% N + 75% K2O, C3 = 130% N + 100% K2O, and C4 = 160% N + 125% K2O. Irrigation with electrical conductivity levels up to 2.1 dS m-1 favored seedling growth for the guava cv. Paluma. Fertilization combinations C1 and C2 promoted the greatest increases in growth and biomass for guava seedlings cv. Paluma 125 days after sowing. Fertilizer combinations did not mitigate the harmful effects of salt stress from irrigation water on the production of young guava cv. Paluma.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135262188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Agro-economic optimization of radish cultivation fertilized with doses of roostertree in a semi-arid environment 半干旱环境下鸡柳施肥萝卜栽培的农业经济优化

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n408rc

Jéssica P. P. da Silva, Francisco Bezerra Neto, Jailma S. S. de Lima, Rayanna C. Ferreira, Isaac A. da S. Freitas, Natan M. Guerra

{"title":"Agro-economic optimization of radish cultivation fertilized with doses of roostertree in a semi-arid environment","authors":"Jéssica P. P. da Silva, Francisco Bezerra Neto, Jailma S. S. de Lima, Rayanna C. Ferreira, Isaac A. da S. Freitas, Natan M. Guerra","doi":"10.1590/1983-21252023v36n408rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n408rc","url":null,"abstract":"ABSTRACT The use of spontaneous species from the Caatinga biome as green manure is a promising practice in increasing the productivity of agricultural systems and sustainable exploitation of the environment. This study aimed to estimate the maximum physical and economic efficiencies of radish agroeconomic characteristics in monocropping as a function of roostertree (Calotropis procera (Ait.) R. Br) biomass amounts in two cropping seasons in a semi-arid environment. The experimental design was randomized complete blocks with five treatments and five replications. The treatments consisted of different roostertree biomass amounts: 16, 29, 42, 55, and 68 t ha-1 on a dry basis, incorporated into the soil. In each block, two additional treatments were added, one without fertilization (control) and the other with mineral fertilizer, for comparison purposes with the maximum efficiency treatment. The radish cultivar planted was ‘Crimson Gigante’. The fertilization of the radish to obtain the maximum optimized productive efficiency (9.56 t ha-1) was possible with the incorporation of 50.86 t ha-1 of C. procera dry biomass into the soil. The maximum optimized agroeconomic efficiency (based on a net income of 37,641.08 R$ ha-1) of radish cultivation was obtained with 44.39 t ha-1 of C. procera dry biomass added to the soil. The rate of return and the profit margin obtained were 2.94 R$ for each real invested, with a profit margin of 62.55%. The use of biomass from the C. procera green manure is a viable technology for producers who practice radish monoculture in a semi-arid environment.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135312076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lettuce and arugula production in intercropping and organic fertilization 生菜和芝麻菜的间作和有机肥生产

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n407rc

Laura M. Ribera, Arthur B. Cecilio Filho, Nathalia D. Peres, Dthenifer C. Santana, Maiele L. da Silva

{"title":"Lettuce and arugula production in intercropping and organic fertilization","authors":"Laura M. Ribera, Arthur B. Cecilio Filho, Nathalia D. Peres, Dthenifer C. Santana, Maiele L. da Silva","doi":"10.1590/1983-21252023v36n407rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n407rc","url":null,"abstract":"ABSTRACT Compared to monoculture, vegetable intercropping allows the optimization of environmental resources and inputs, with positive effects on the yield and profitability of the crop. This study aimed to evaluate the yield of lettuce and arugula in intercropping and intercrop evaluation indexes according to cattle manure doses. The experiment was conducted in Aquidauana, MS, Brazil. Five doses of cattle manure (0, 15, 30, 45, and 60 t ha-1) were evaluated with four replications in a randomized block design. Higher growth and yield of the intercropped species were observed when the intercrop received 60 t ha-1 of cattle manure. However, the maximum values of the variables were not reached, so better performances can be obtained with higher doses. The indexes of actual yield loss and advantage of intercropping presented higher values starting at doses of 26 and 30 t ha-1 of manure, respectively. The highest land use efficiency (1.28) was obtained with 60 t ha-1 of cattle manure, indicating the agronomic viability of the lettuce and arugula intercrop when fertilized only with cattle manure.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135260799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydroponic cultivation of okra using saline nutrition solutions under application of salicylic acid 水杨酸施盐营养液水培秋葵

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n419rc

Pedro F. do N. Sousa, Maíla V. Dantas, Geovani S. de Lima, Lauriane A. dos A. Soares, Hans R. Gheyi, Luderlândio de A. Silva, Kilson P. Lopes, Pedro D. Fernandes

{"title":"Hydroponic cultivation of okra using saline nutrition solutions under application of salicylic acid","authors":"Pedro F. do N. Sousa, Maíla V. Dantas, Geovani S. de Lima, Lauriane A. dos A. Soares, Hans R. Gheyi, Luderlândio de A. Silva, Kilson P. Lopes, Pedro D. Fernandes","doi":"10.1590/1983-21252023v36n419rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n419rc","url":null,"abstract":"ABSTRACT The limited availability of low-salinity water for irrigation in the Northeastern semi-arid region has restricted food production, making it necessary to use strategies to reduce the effects of salt stress on plants. Among the alternatives, the foliar application of salicylic acid stands out. In this context, the objective of this study was to evaluate the effects of foliar application of salicylic acid in mitigating salt stress on the gas exchange, chlorophyll a fluorescence, photosynthetic pigments, and growth of ‘Canindé’ okra in a hydroponic system. The experiment was carried out in a greenhouse, in Pombal - PB, using the Nutrient Film Technique - NFT hydroponic system. The experimental design used was completely randomized in a split-plot scheme, with four levels of electrical conductivity of the nutrient solution - ECns (2.1, 3.6, 5.1, and 6.6 dS m-1) as the plots and four concentrations of salicylic acid - SA (0, 1.2, 2.4, and 3.6 mM) as the subplots, with four replicates and two plants per plot. SA concentration of 3.6 mM was able to minimize the effect of nutrient solution salinity on chlorophyll a fluorescence and increase the synthesis of chlorophyll b in okra plants, 34 days after transplanting. Nutrient solution salinity above 2.1 dS m-1 negatively affected gas exchange, relative water content, photosynthetic pigments, and growth and increased electrolyte leakage in the leaf blade of okra plants.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135261459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphophysiology and water relations of Spondias rootstocks under different irrigation frequencies 不同灌溉频率下刺草砧木形态生理及水分关系

4区农林科学

Revista Caatinga Pub Date : 2023-01-01 DOI: 10.1590/1983-21252023v36n414rc

Luderlândio de A. Silva, Lauriane A. dos A. Soares, Geovani S. de Lima, Iara A. Roque, Reynaldo T. de Fátima, Adriana S. Lima

{"title":"Morphophysiology and water relations of Spondias rootstocks under different irrigation frequencies","authors":"Luderlândio de A. Silva, Lauriane A. dos A. Soares, Geovani S. de Lima, Iara A. Roque, Reynaldo T. de Fátima, Adriana S. Lima","doi":"10.1590/1983-21252023v36n414rc","DOIUrl":"https://doi.org/10.1590/1983-21252023v36n414rc","url":null,"abstract":"ABSTRACT The semi-arid region of northeastern Brazil is characterized by scarcity of water for irrigation purposes due to long periods of drought, compromising the development of species such as Spondias tuberosa L. and Spondias mombin L., which, despite being considered drought tolerant, can have their yield negatively affected by low water availability. The objective of this study was to evaluate the morphophysiology, quantum efficiency and water relations of S. tuberosa and S. mombin rootstocks under different irrigation intervals in the semi-arid region of Paraíba, Brazil. The experimental design was carried out in randomized blocks, in a 5 × 2 factorial scheme, referring to 5 irrigation intervals - INT (1, 2, 3, 4 and 5 days after each irrigation event) and two species of the genus Spondias - SPC (S. tuberosa and S. mombin) with four replicates and three plants per plot, totaling 120 plants. Irrigation management with a five-day irrigation interval reduced gas exchange and growth of rootstocks of the Spondias species. The quantum efficiency of photosystem II of Spondias rootstocks (S. tuberosa and S. mombin) was not compromised when the plants were irrigated every two and four days. Irrigation every three days in the early stages of development of Spondias species can be used with the lowest losses in gas exchange and growth of rootstocks.","PeriodicalId":21558,"journal":{"name":"Revista Caatinga","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135316821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0