7
Ali Abdzad Gohari; Amir Nik Akhtar; Niazali Ebrahimipak; Arash Tafteh
Abstract
Soil and Water Research Institute (SWRI) has presented NIAZAB system to estimate and determine crops water requirement, water consumption, and irrigation planning at the scale of region, district, and plains in Iran. The current research was conducted in order to use NIAZAB system (including Tafteh, ...
Read More
Soil and Water Research Institute (SWRI) has presented NIAZAB system to estimate and determine crops water requirement, water consumption, and irrigation planning at the scale of region, district, and plains in Iran. The current research was conducted in order to use NIAZAB system (including Tafteh, Pasquale and Reas methods) in determining the amount of water used for soybean cv. Williams, based on the inverse solution of the production function. The experimental treatments in this research included no fertilizer and application of of 150 kg N ha-1 and different irrigation treatments including 100%, 80%, 60%, and 40% of water requirement. Experimental design was split plot in the form of randomized complete blocks with three replications, and was conducted in Hajiabad Region, Hormozgan Province, in 2020 and 2021. The values estimated by the system and measured showed that, in the first year, the average relative error (ARE) in eatimation of evapotranspirationin by Tafteh, Pasquale and Reas methods were 7.49%, -0.05%, and 9.14%, respectively. In the second year, these values were 6.47%, -1.29%, and 9.06%, respectively. The ARE in the physical water productivity in the mentioned methods was -8.23%, -0.73%, and -10.08% in the first year, and -7.10%, 0.58%, and -10.07% in the second year, respectively. In Tafteh, Pasquale, and Reas methods, the root mean square error (RMSE) were 43, 35, and 49 mm, respectively, and the normalized root mean square error (RMSEn) were 0.093%, 0.076%, and 0.105%, respectively. Considering the results, NIAZAB system estimated the amount of irrigation water and evapotranspiration with acceptable approximation and it can be used for estimation of water consumption in the studied area.
7
Ali Abdzad Gohari
Abstract
Knowing the appropriate cultivars and proper irrigation management is one of the most important factors affecting the growth and yield of peanut plant. The present study was conducted as split split plots in the form of a randomized complete block design with three replications, in 2018 and 2019 ...
Read More
Knowing the appropriate cultivars and proper irrigation management is one of the most important factors affecting the growth and yield of peanut plant. The present study was conducted as split split plots in the form of a randomized complete block design with three replications, in 2018 and 2019 in Guilan Province. The main plot consisted of two methods of drip and furrow irrigation, and the sub-plots included supplying 125%, 100%, 75%, 50%, and 25% of water requirement, and the sub-sub-plot included two peanut cultivars Guil and Jonobi. The results of the study showed significant effect of irrigation method on seed yield (at p<0.5) and the effect of water supply on all measured traits (at p<0.1). The highest seed yield in 2018 and 2019 was observed in Guil cultivar with 100% water requirement of the plant with an average of 3221 and 3161 kg.ha-1, respectively. In the two study years, annual averages of seed yields in drip irrigation (1808 and 1803 kg/ha) compared to the furrow method (1753 and 1754 kg/ha) showed an increase of 3.1% and 2.8%, respectively. The correlation between traits, showed a positive and significant effect between seed yield and number of pods per plant, number of seeds per plant, and 100-seed weight. Based on the results, for peanut cultivation in the study area, Guil cultivar with drip irrigation and providing 100% of water requirement (5481 m3 of water/ha in this research) is recommended.
Ali Abdzad Gohari; Omid Sadeghipour
Abstract
Water scarcity is one of the most important environmental factors limiting crop production. Consumption of natural fertilizers can make optimal use of water in irrigation. The aim of this study was to investigate the effect of deficit irrigation and humic acid on yield and water use efficiency in common ...
Read More
Water scarcity is one of the most important environmental factors limiting crop production. Consumption of natural fertilizers can make optimal use of water in irrigation. The aim of this study was to investigate the effect of deficit irrigation and humic acid on yield and water use efficiency in common bean. The experiment was conducted in split plots based on randomized complete block design, with three replications in Guilan province, in 2016. The main factor was irrigation at three levels (rainfed, 50%, and 100% water requirement) and the sub factor included humic acid spraying at four levels (0, 2, 4, and 6 L.ha-1). In irrigation treatments, highest average seed yield (2610 kg.ha-1) was obtained in full irrigation conditions (100% water requirement). In the humic acid spraying applications, maximum seed yield was observed at 6 L.ha-1 with average of 2661 kg.ha-1. In interaction of irrigation and humic acid, the highest seed yield was obtained in full irrigation and 6 L ha-1 humic acid with an average of 3547 kg.ha-1. The highest seed yield (3030 kg.ha-1) was obtained in 50% water requirement and 6 L.ha-1 humic acid. The highest seed yield in rainfed conditions was obtained at 4 and 6 L.ha-1 of humic acid, with an average of 1461 and 1406 kg.ha-1, respectively. In different irrigation treatments, the highest water use efficiency was obtained with the mean of 1.78 kg.m-3 in rainfed treatment. The humic acid treatments had a positive effect on water use efficiency in comparison with the non-humic acid treatments, but there was no significant difference between treatments 2, 4, and 6 L.ha-1. Altogether, the results of this study indicate the beneficial effects of humic acid on water deficit stress in common bean cultivation in the study area.
Ali Abdzad Gohari; ebrahim amiri
Abstract
The inputs of water and fertilizer are important in agricultural production, with a shortage of each one reducing the yield of the product. The role and importance of each of the factors of water and fertilizer separately can be effective in increasing yield. The purpose of this study was to evaluate ...
Read More
The inputs of water and fertilizer are important in agricultural production, with a shortage of each one reducing the yield of the product. The role and importance of each of the factors of water and fertilizer separately can be effective in increasing yield. The purpose of this study was to evaluate the effect of irrigation and nitrogen fertilizer on production function and water productivity in peanut plant in Guil cultivar. The experiment was conducted as a split plot based on randomized complete block design with 3 replications, in 2009 in Astaneh Ashrafiyeh. The main treatments included: without irrigation (control) and irrigation with intervals of 6, 12, and 18 days, while the sub treatments were nitrogen fertilizer rates of 0, 30, 60, and 90 kg ha-1. A quadratic equation was used to estimate the water-fertilizer production function. The results of production function estimation indicated that seed yield increased with nitrogen fertilizer up to 60 kg ha-1. But, with a gradual increase in nitrogen fertilizer, yield was reduced. Increasing nitrogen fertilizer from 60 kg ha-1 in different amounts of water consumed had no effect on yield increase. Water productivity and the water utilization rate in the irrigation interval of 6 days, with consumption of 328 mm, was the highest. In the irrigation interval of 6 days and consumption of 60 kg N-fertilizer ha-1, the maximum amount of water productivity was 0.96 kg m-3.
hossin babazadeh; Ali Abdzad Gohari; Arash Khonok
Abstract
Proper and efficient use of water and fertilizers, in addition to increasing productivity, increase crop yield. In order to study the effects of drip irrigation management and nitrogen fertilizer levels on yield of peanut, an experimen was conducted in Astaneh Ashrafiyeh, Guilan province, in 2012 and ...
Read More
Proper and efficient use of water and fertilizers, in addition to increasing productivity, increase crop yield. In order to study the effects of drip irrigation management and nitrogen fertilizer levels on yield of peanut, an experimen was conducted in Astaneh Ashrafiyeh, Guilan province, in 2012 and 2013 using split plot in a randomized complete block design with three replications. The main plot included water treatments consisting of no irrigation and application of 60%, 80%, and 100 percent water requirement. Sub plots included nitrogen fertilizer levels i.e. 0, 30, 60 and 90 kg.ha-1. The results showed that pod yield were similar in treatments of %80 and 100 percent crop water requirement corresponding to 2385 and 2452 kg.ha-1 in 2012. In 2013, the yields were, respectively, 2383 and 2448 kg.ha-1. The highest pod yield was obtained in 60 kg.N.ha-1 treatment in 2012 and 2013, amounting to, respectively, 2351 and 2667 kg.ha-1. Seed yields in 2012 and 2013 were obtained in 100 percent crop water requirement, with 1885 and 1877 kg.ha-1, respectively, which were significantly higher compared to the treatment without irrigation. In the fertilizer treatments, the average yield of 60 kg N.ha-1 in 2012 and 2013 was, respectively, 1829 and 2012 kg.ha-1. In water treatments, water productivity based on biomass yield varied between 1.03 and 1.68 kg.m-3 and, based on pod yield, it was observed between 0.37 and 0.63 kg.m-3, in 2012 and 2013. The water productivity values of seed yield in the 100% water requirement in the crop years 2012 and 2013 were 0.28 and 0.40 kg.m-3, respectively. Therefore, considering the results of yield and water productivity, management practice of 100% water requirement and 60 kg.N.ha-1 is the most appropriate method for peanut cultivation in the study area.