Irrigation and Drainage最新文献

{"title":"Improved understanding of soil water content at field capacity and estimates from pedotransfer functions","authors":"Samira Jaefarzade Andabili,&nbsp;Ali Rasoulzadeh,&nbsp;Javad Ramezani Moghadam,&nbsp;Joseph Alexander Paul Pollacco,&nbsp;Jesús Fernández-Gálvez","doi":"10.1002/ird.3032","DOIUrl":"https://doi.org/10.1002/ird.3032","url":null,"abstract":"<p>The soil water content at field capacity, <i>θ</i>_FC, is a fundamental variable for irrigation and agriculture. This study determines the optimal tension (−33 or −10 kPa) of deriving <i>θ</i>_FC which best matches the <i>in situ</i> field measurements following the Veihmeyer procedure. The Veihmeyer method refers to a profile water status for which there is a negligible drainage rate of bare soil without evaporation. In addition, we derive a set of linear and nonlinear pedotransfer functions (PTFs) which estimate <i>θ</i>_FC. <i>θ</i>_FC was measured in 69 plots in north-western Iran, which has a cold semi-arid climate. The soil properties used for developing PTFs include texture, bulk density, and organic matter. The results show that <i>θ</i>_FC cannot be derived at a fixed tension. We therefore developed PTFs with satisfactory performance in reproducing <i>in situ</i> measured <i>θ</i>_FC. The findings show that PTFs developed at a fixed tension consistently underestimate <i>θ</i>_FC derived <i>in situ</i>. It was also speculated that tension less than −10 kPa could yield improved predictions of <i>in situ θ</i>_FC.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"516-528"},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ird.3032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing a new unsteady-state equation for the design of subsurface drainage systems suitable for the Delta region, Egypt","authors":"Safaa Youssef Mohammad Fath-Allah","doi":"10.1002/ird.3023","DOIUrl":"https://doi.org/10.1002/ird.3023","url":null,"abstract":"&lt;p&gt;The main goal of this research is to obtain a new unsteady-state equation for the design of subsurface drainage systems that provides a more combatable solution under conditions in the Delta region, Egypt, while simultaneously avoiding all obstacles, difficulties and points of argument in other unsteady-state equations. The point of argument in unsteady-state assumptions is the initial water table shape. Then, the study reached a constant called &lt;i&gt;C&lt;/i&gt;&lt;sub&gt;sh&lt;/sub&gt;, which represents the initial water table shape and was proven to depend on drain depth (d.d.). Moreover, the new equation avoids using the drainable porosity of soil (&lt;i&gt;f&lt;/i&gt;), which is the greatest restriction in using unsteady-state equations. The new equation replaces &lt;i&gt;f&lt;/i&gt; with another constant called &lt;i&gt;C&lt;/i&gt;&lt;sub&gt;s,&lt;/sub&gt; which can be easily determined by using tables or graphs depending on drain depth (d.d.) and hydraulic conductivity (&lt;i&gt;k&lt;/i&gt;). Another new important variable is also used in the new equation: the hydraulic head after 6 days of irrigation (&lt;i&gt;h&lt;/i&gt;). Using this parameter with the initial water table (&lt;i&gt;h&lt;/i&gt;&lt;sub&gt;0&lt;/sub&gt;) and the water table after &lt;i&gt;t&lt;/i&gt; days (&lt;i&gt;h&lt;/i&gt;&lt;sub&gt;&lt;i&gt;t&lt;/i&gt;&lt;/sub&gt;) ensures more accurate results. Then, the new equation, which can be called the Safaa equation, can result in an optimum solution for the Delta region, Egypt, because it provides spacing between laterals (&lt;i&gt;L&lt;/i&gt;), which results in the desired performance with the least cost.&lt;/p&gt;&lt;p&gt;Résumé&lt;/p&gt;&lt;p&gt;L'objectif principal de cette recherche est d'obtenir une nouvelle équation à l'état instable pour la conception de systèmes de drainage souterrain qui offre une solution possible de lutter contre les conditions de la région du Delta, en Egypte, tout en évitant tous les obstacles, les difficultés et les arguments dans d'autres équations à l'état instable. Le point d'argument dans les hypothèses à état instable est la forme initiale de la nappe phréatique. Ensuite, l'étude a atteint une constante appelée C&lt;sub&gt;sh&lt;/sub&gt;, qui représente la forme initiale de la nappe phréatique et s'est avérée dépendante de la profondeur du drain (d.d.). De plus, la nouvelle équation évite d'utiliser la porosité de drainage du sol (f), qui est la plus grande restriction dans l'utilization des équations à l'état instable. La nouvelle équation remplace f par une autre constante appelée C&lt;sub&gt;s&lt;/sub&gt;, qui peut être facilement déterminée en utilisant les tableaux ou les graphiques en fonction de la profondeur du drain (d.d.) et de la conductivité hydraulique (k). Une autre variable importante est également utilisée dans la nouvelle équation: la charge hydraulique après six jours d'irrigation (h). L'utilization de ce paramètre avec la nappe phréatique initiale (h&lt;sub&gt;0&lt;/sub&gt;) et la nappe phréatique après t jours (h&lt;sub&gt;t&lt;/sub&gt;) assure des résultats plus précis. Ensuite, la nouvelle équation, que l'on peut appeler l'équation de Safaa, peut aboutir à une solution optimale pour la région du delta, en Egyp","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"795-808"},"PeriodicalIF":1.6,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809484","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}

{"title":"Irrigation water strategies to intensify vegetable production on smallholder farms in Guyana","authors":"Chandra A. Madramootoo,&nbsp;Guia Marie M. Mortel","doi":"10.1002/ird.3026","DOIUrl":"https://doi.org/10.1002/ird.3026","url":null,"abstract":"<p>As part of its development program, Guyana is diversifying and expanding its agricultural sector to increase the production of higher-value vegetable crops. Apart from ensuring food security, this also reduces the country's food import bill. Abandoned sugarcane lands are targeted for the intensification and expansion of vegetable production. This study seeks to determine the supplemental irrigation requirements of vegetable farms located along coastal lands, recommend scenarios to manage water during the two annual dry seasons, and understand the effects of irrigation thresholds on the yields of six commonly planted vegetables. The AquaCrop model was used for this purpose, together with inputs of field-measured soil and climate data obtained from 2005 to 2012. Yield simulations of seven irrigation thresholds (40, 50, 60, 70, 80, 90, and 100% total available water [TAW]) were evaluated. At 40, 50, and 60% TAW, a decreasing irrigation requirement did not significantly reduce yield (pairwise <i>t</i>-test, <i>p</i> &gt; 0.05). The use of 40, 50, or 60% TAW irrigation thresholds during the two annual dry seasons is recommended. The low irrigation requirements for vegetables do not compete with the water requirements of rice and sugarcane production.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"738-748"},"PeriodicalIF":1.6,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ird.3026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identifying suitable boreholes for irrigation in the bedrock regions of the Sahel","authors":"Amadou Keïta,&nbsp;Moussa Diagne Faye,&nbsp;László G. Hayde,&nbsp;Djim Doumbe Damba,&nbsp;Hamma Yacouba","doi":"10.1002/ird.3024","DOIUrl":"https://doi.org/10.1002/ird.3024","url":null,"abstract":"<p>This study addresses the critical challenge of optimizing borehole drilling techniques and predictive models to improve groundwater utilization for irrigation in Burkina Faso. Initially, the analysis involved drilling 22 boreholes as part of a photovoltaic micro-sprinkler irrigation project (PRECIS), with only 11 deemed suitable for irrigation, highlighting the difficulty in achieving the required flow rate of 5 m³/h. To enhance the robustness of the study, additional data from 205 high-yield boreholes provided by the Office National de l'Eau et de l'Assainissement (ONEA) were incorporated. These boreholes, primarily intended for potable water supply, had flow rates often exceeding 5 m³/h. This extensive dataset was crucial in identifying significant predictors of the project flow rate (<i>Qproj</i>), including the flow rate at the end of drilling (<i>QEndBorh</i>) and lithological factors. The predictive model combining <i>QEndBorh</i> and lithological data explained 73.7% of the variance in <i>Qproj</i>, with an adjusted coefficient of determination (<i>R</i>²_adj) of 72.4%. The CART (classification and regression tree) regression model effectively identified branches with flow rates suitable for irrigation, such as Terminal Node 3 with a predicted <i>Qproj</i> of 6.67 m³/h and Terminal Node 4 with a predicted <i>Qproj</i> of 10.5 m³/h, demonstrating the model's robustness. These findings underscore the necessity of detailed lithological assessments and advanced predictive modelling to ensure efficient and reliable borehole drilling for irrigation purposes in regions with complex geological conditions.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"73 5","pages":"1754-1777"},"PeriodicalIF":1.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253425","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}

{"title":"Assessment of irrigation performance trends using selected comparative indicators over consecutive periods: A case study of the Koga Irrigation Scheme in the Amhara region, Ethiopia","authors":"Desalegn Tegegne,&nbsp;Menwagaw T. Damtie,&nbsp;Alebachew Shumye","doi":"10.1002/ird.3021","DOIUrl":"https://doi.org/10.1002/ird.3021","url":null,"abstract":"&lt;p&gt;The Koga Irrigation Scheme is a modern irrigation scheme in Ethiopia, and furrow irrigation is a common water application method. The main purpose of this study is to show in which year it performed well and what the problems were and to identify the best alternatives that may be essential for managing the scheme effectively and efficiently. The performance trends of the Koga Irrigation Scheme were evaluated using four selected performance indicators, namely, physical, agricultural, water use and economic performance indicators. Primary and secondary data, including geographic locations, water supply, harvested yield, market prices, irrigated crops, actual irrigated area, planned irrigable area, total management and operation cost, water fees and historical climate data, were collected. Land use performance analysis indicates that the scheme operates below its potential. The maximum irrigated area was 6,327.7 ha less than the designed 7,000 ha in 2015 and 3,619.9 ha in 2016. Water consumption peaked in 2015 and decreased in 2016. The dominant crops were wheat (55%), potato (19%), barley (7.6%), onion (7.4%), maize (5.6%) and other crops (5.4%). This suggests a preference for low-value, water-intensive crops. Water use by crops is lower than reservoir release, indicating significant water loss. Economic water productivity is low, primarily due to the dominance of low-value, water-intensive crops. To enhance scheme performance, the study recommends adjusting cropping patterns, estimating actual water demand for the respective crops and irrigation scheduling, adopting efficient water application methods and strengthening the market chain.&lt;/p&gt;&lt;p&gt;Le périmètre d'irrigation de Koga est un périmètre d'irrigation moderne en Ethiopie, et l'irrigation par sillon est une méthode courante d'application de l'eau. Cette étude vise à montrer en quelle année elle a donné de bons résultats et quels ont été les problèmes et à identifier les meilleures alternatives qui pourraient être essentielles pour une gestion efficace et efficiente du programme. Les tendances de performance du périmètre d'irrigation de Koga ont été évaluées à l'aide de quatre indicateurs de performance sélectionnés, à savoir des indicateurs de performance physique, agricole, d'utilization de l'eau et économique. Des données primaires et secondaires, y compris les emplacements géographiques, l'approvisionnement en eau, le rendement des récoltes, les prix du marché, les cultures irriguées, la superficie irriguée réelle, la superficie irrigable prévue, les coûts totaux de gestion et d'exploitation, les droits sur l'eau et les données climatiques historiques, ont été recueillies. L'analyse des performances d'utilization des sols indique que le système fonctionne en deçà de son potentiel. La superficie maximale irriguée était de 6,327,7 ha en 2015 et 3,619,9 ha en 2016 de moins que les 7,000 ha prévus. La consommation d'eau a culminé en 2015 et a diminué en 2016. Les cultures dominantes étaient l","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"809-819"},"PeriodicalIF":1.6,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809937","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}

{"title":"Strategies of water resource utilization and agricultural water management in the coastal saline zone of Bangladesh","authors":"Md. Belal Hossain,&nbsp;Debjit Roy,&nbsp;Priya Lal Chandra Paul,&nbsp;Mst. Shetara Yesmin,&nbsp;Palash Kumar Kundu,&nbsp;Mohammad Rezoan Bin Hafiz Pranto,&nbsp;Md Aklimuzzaman,&nbsp;Mousumi Paul,&nbsp;Md. Maniruzzaman,&nbsp;Mohammed Mainuddin","doi":"10.1002/ird.3022","DOIUrl":"https://doi.org/10.1002/ird.3022","url":null,"abstract":"<p>Access to irrigation water is pivotal for dry season crops in the coastal saline regions of Bangladesh. This research investigates strategic measures aimed at ensuring water availability for polder agricultural purposes in the dry season. This study was performed from 2017 to 2022 to assess the water availability inside polders # 30 and # 31 in Khulna region of the south-western coastal zone of Bangladesh. Our methodology encompassed diverse approaches: identifying optimal water sources, capturing low-salinity water for agriculture, implementing crop–soil–water management to enhance cropping intensity, employing irrigation modelling for effective crop planning, utilizing GIS techniques to estimate water storage and conducting impact analysis using satellite images. Irrigation by trapped river water increased the yield of different crops by 13–56% compared with that of farmer-managed plots. Polders # 30 and # 31 currently have approximately 136 and 190 km of good canals, which store 334 and 502 ha-m of water, respectively, during the dry period. With the existing stored fresh water, a maximum of 6,680 ha and 10,040 ha of watermelon and a minimum of 334 and 502 ha of boro rice cultivation were possible in polders # 30 and # 31, respectively. However, the excavation of poor and dead canals could increase freshwater storage and crop coverage. The image analysis of polder #31 revealed an increase in crop coverage of 238% from 2017 to 2022, which might be attributed to the introduction of advanced water management technologies and salt-tolerant cultivars as well as holistic extension approaches by different government organizations (GOs), non-governmental organizations (NGOs) and farmers. This study will assist in formulating pathways for polder-scale water management and cropping intensification in coastal saline zones.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"820-833"},"PeriodicalIF":1.6,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809970","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}

{"title":"Improving the root yield, quality, water productivity and economics of sarpagandha (Rauwolfia serpentina L. Benth.) through irrigation and nitrogen management","authors":"Sanmay Kumar Patra,&nbsp;Sudip Sengupta,&nbsp;Madhurima Banik,&nbsp;Ratneswar Poddar","doi":"10.1002/ird.3020","DOIUrl":"https://doi.org/10.1002/ird.3020","url":null,"abstract":"&lt;p&gt;Sarpagandha is a well-known ayurvedic herb valued for its therapeutic properties. Effective irrigation and nitrogen management are crucial for its sustainable cultivation. To investigate the optimal irrigation and nitrogen requirements and economic advantages, a field study was conducted over two consecutive growing seasons (2017–2019 and 2019–2021). This study employed a split-plot design, evaluating 12 treatment combinations, including three levels of irrigation (irrigation water to cumulative pan evaporation ratios [IW/CPE] of 0.6, 0.9 and 1.2) and four nitrogen management strategies (100% of the recommended dose of nitrogen [RDN] applied as vermicompost, 50–50 and 25–75 split between vermicompost and fertilizer, and 100% RDN applied as fertilizer). The results revealed that the highest root yield (1437 kg ha&lt;sup&gt;−1&lt;/sup&gt;); nitrogen, phosphorus and potassium uptake (134, 44.78 and 142 kg ha&lt;sup&gt;−1&lt;/sup&gt;, respectively); fresh and dry weights (67 and 28 g, respectively); total alkaloid content (2%); and economic returns, including a benefit to cost ratio (BCR) of 2.95, were achieved with irrigation at an IW/CPE of 0.9 combined with 100% RDN from vermicompost. However, when vermicompost was limited, IW/CPE 0.9 with either a 50–50 or 25–75 split of RDN between vermicompost and fertilizer emerged as a viable alternative with a BCR of 2.62 and 2.58, respectively. These findings offer valuable insights for optimizing sarpagandha yield and economic performance under conditions of limited input resources.&lt;/p&gt;&lt;p&gt;Sarpagandha est une plante ayurvédique bien connue et appréciée pour ses propriétés thérapeutiques. Une irrigation et une gestion efficaces de l'azote sont importantes pour sa culture durable. Pour étudier les besoins optimaux en irrigation et en azote et les avantages économiques, une étude sur le terrain a été menée pendant deux saisons de croissance consécutives (2017–2019 et 2019–2021). Cette étude a utilisé un plan de parcelles en deux, évaluant 12 combinaisons de traitement, y compris trois niveaux d'irrigation, des rapports d'eau d'irrigation à l'évaporation cumulative de la cuvette (IW/CPE) de 0,6, 0,9 et 1,2, et quatre stratégies de gestion de l'azote, 100% de la dose d'azote recommandée (RDN) appliquée sous forme de vermicompost, 50 à 50 et 25 à 75 réparties entre le vermicompost et l'engrais, et 100% de RDN appliquée sous forme d'engrais. Les résultats ont révélé que le rendement racinaire le plus élevé (1437 kg ha-1), l'absorption de N, de P et de K (134, 44,78 et 142 kg ha&lt;sup&gt;−1&lt;/sup&gt;, respectivement), le poids frais et sec (67 et 28 g, respectivement), la teneur totale en alcaloïdes (2%) et les rendements économiques, y compris un rapport coût-bénéfice (RCB) de 2,95, ont été obtenus avec une irrigation à un IW/CPE de 0,9 combiné à 100% de RDN provenant du vermicompost. Cependant, lorsque le vermicompost était limité, l'IW/CPE 0,9 avec une répartition 50–50 ou 25–75 du RDN entre le vermicompost et l'engrais est apparu s'est avér","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"673-687"},"PeriodicalIF":1.6,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809697","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}

{"title":"The effect of olive pomace biochar on some characteristics of Vertisols","authors":"Remzi İlay,&nbsp;Seda Özer Bodur,&nbsp;S. Tuğçe Eren,&nbsp;Yasemin Kavdır,&nbsp;Hüseyin Ekinci","doi":"10.1002/ird.3017","DOIUrl":"https://doi.org/10.1002/ird.3017","url":null,"abstract":"<p>The aim of this study was to investigate the effect of olive pomace biochar (OB) application on the mechanical, physical and chemical properties of Vertisols. For this study, soil samples classified as Vertisol in Çanakkale, where internal drainage and surface ponding are major problems, were used. The OB was produced at 450°C and then mixed with 0% (control), 3%, 6% and 9% of the soil by weight. Various soil parameters, including the Atterberg limits (liquid limit [LL], plastic limit [PL], plasticity index [PI], shrinkage limit [SL]), saturated hydraulic conductivity (<i>K</i>_sat), field capacity (FC), total carbon (TC) and total nitrogen (TN), were determined. The values of all the soil parameters increased, except for the PI. Moreover, the <i>K</i>_sat value increased by 127% and 136% with 6% and 9% OB application, respectively, compared to that of the control. Additionally, the FC, TN and TC levels in the soils increased in response to biochar application. In conclusion, OB application has a positive effect on the specific properties of Vertisol and can improve its physical properties.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"615-626"},"PeriodicalIF":1.6,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ird.3017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trend analysis of water quality in the irrigation districts of southern Alberta, Canada","authors":"Janelle Villeneuve,&nbsp;Jacqueline Kohn,&nbsp;Nicole Seitz Vermeer,&nbsp;Madison Kobryn","doi":"10.1002/ird.3019","DOIUrl":"https://doi.org/10.1002/ird.3019","url":null,"abstract":"<p>Irrigation is essential for high agricultural production and crop diversity in semi-arid regions such as southern Alberta, Canada. Nearly 75% of Canada's irrigation takes place in Alberta's irrigation districts, making the management and maintenance of irrigation water quality highly important in this region. In this study, temporal water quality trend analysis was conducted on southern Alberta irrigation water from 2006 to 2023. The trends of 19 water quality parameters, including nutrients, salinity, physical characteristics, <i>Escherichia coli</i>, and pesticides, were evaluated at 74 sites. Of the total number of parameter-by-site tests (902) conducted, 36.5% had statistically significant decreasing trends, 1.3% had statistically significant increasing trends, and 62.2% had no trend. This indicates stability and improvement in water quality during the study period at the resolution of individual sites. Regional trend analysis revealed trends in 11 out of the 19 parameters tested: 9 decreased, 2 increased, and 8 exhibited no trend, which also indicated stable and improving water quality. Continued monitoring is important for areas and parameters showing increasing trends to guide mitigation action. This information can be used to focus water and land management decisions and direct resources to priority areas and parameters to ensure excellent quality irrigation water for all users.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"780-794"},"PeriodicalIF":1.6,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ird.3019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new method of estimating infiltration parameters for furrow irrigation","authors":"George Kargas,&nbsp;Leonidas Mindrinos","doi":"10.1002/ird.3016","DOIUrl":"https://doi.org/10.1002/ird.3016","url":null,"abstract":"<p>In this study, we present new two-point and one-point methods for estimating infiltration parameters in furrow irrigation. It is assumed that infiltration and waterfront advance along the furrow follow the Valiantzas two-parameter infiltration and power advance equations, respectively. The two parameters, the sorptivity (<i>S</i>) and the saturated hydraulic conductivity (<i>K</i>_s), are estimated by solving a quadratic equation. The presented solution of the infiltration-advance problem is one of the few that uses physically significant parameters (<i>S</i>, <i>K</i>_s), which can provide adequate infiltration and advance behaviour at all time scales. The prediction of infiltration from the proposed methods is compared with experimental data and with the two-point method of Ebrahimian et al. and the one-point method of Shepard et al. The values of <i>S</i> between the two-point methods are nearly identical in all cases, while the values of the <i>A</i>/<i>K</i>_s ratio range from 0.48 to 0.89 (parameter <i>A</i> is related to <i>K</i>_s). Regarding the one-point method, the two examined methods yield similar <i>S</i> values as their relationship is given by the equation <i>S</i>_Shepard = 1.043 <i>S</i>_new (coefficient of determination \u0000<span></span><math>\u0000 <msup>\u0000 <mi>R</mi>\u0000 <mn>2</mn>\u0000 </msup>\u0000 <mo>=</mo>\u0000 <mn>0</mn>\u0000 <mo>.</mo>\u0000 <mn>999</mn></math>), while the values of the parameters <i>A</i> and <i>K</i>_s are linked by the equation \u0000<span></span><math>\u0000 <mi>Α</mi>\u0000 <mo>=</mo>\u0000 <mn>0.69</mn>\u0000 <mspace></mspace>\u0000 <msub>\u0000 <mi>K</mi>\u0000 <mi>s</mi>\u0000 </msub></math>.</p>","PeriodicalId":14848,"journal":{"name":"Irrigation and Drainage","volume":"74 2","pages":"658-672"},"PeriodicalIF":1.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ird.3016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}