aliashraf sadraddini; mohammadamin parandin; Amir hossin nazemi
Abstract
Some experiments were performed around the Agricultural and Natural Resources Research Station of Islamabad-Gharb city in order to determine the reaction of corn crop to deficit irrigation strategy and its effects on yield, yield components and water productivity (WP) under furrow irrigation. The research ...
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Some experiments were performed around the Agricultural and Natural Resources Research Station of Islamabad-Gharb city in order to determine the reaction of corn crop to deficit irrigation strategy and its effects on yield, yield components and water productivity (WP) under furrow irrigation. The research used randomized complete block design (as a composite analysis in two years (2015 and 2016)). The treatments included irrigation with 100%, 75%, 50% and 25% water requirement with three replications. The SC704 Variety was used for planting corn. To compare the treatments, the 7 parameters of the performance components were considered, using analysis of variance (ANOVA). The results showed that the weight of corns in the first treatment was significantly superior to other treatments. Nevertheless, there was no significant difference in total weight of ears, ears length, seeds number per row, number of ear rows, wood weight and the weight of 1000 corns between treatments of 100% and 75% water requirement. However, in all measured attributes, there were significant differences between the other two treatments and the first and second treatments. Regarding water productivity in terms of total weight and grain weight of ears, the 75% treatment was superior to other treatments and had significant differences with the other treatments. In the treatment with 75% water requirement, WP was 0.8 kg/m3 based on the total weight of the grains, and based on the seed weight, it was 0.62 kg/m3, which were, respectively, 17% and 13% higher than the full irrigation treatment. The results showed that the highest water productivity was observed with about 30% deficit irrigation. It is to be noted that deficit irrigation may increase salinity of the root zone.
n s; h d; a d
Abstract
Application of advance irrigation methods to a proper utilization of water resources is inevitable. The effects of different amounts of irrigation water on yield and quality of two varieties of date palm under asubsurface drip irrigation were studied in Behbahan Agricultural Research Station during two ...
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Application of advance irrigation methods to a proper utilization of water resources is inevitable. The effects of different amounts of irrigation water on yield and quality of two varieties of date palm under asubsurface drip irrigation were studied in Behbahan Agricultural Research Station during two growing seasons (2014-2015). The study was conducted in a randomized complete block design with a split plot design with three replications where three levels of water application based on T1=75%, T2=100% and T3=125% of crop water requirement, were as the main plots and two variety of Khasi and Zahedi were as sub-plots. The results showed that different levels of irrigation have not had no significant effect on the quality and yield of fruit. However, there was a significant difference (p<0.01) between the levels of irrigation in terms of water use efficiency. Accordingly, T1 by 0.88 kg of dates per cubic meter of water showed higher water use efficiency. Comparison of mean interactions between the water application and varieties showed water use efficiency of Khasi and Zahedi varieties were 0.86 and 0.89 kg/m3, respectively. The applied irrigation water of palm trees based on T1 was of 7545 m3/ha which was 2515 m3/ha less compared to that under T2.
H R; B A
Abstract
Food security, drought, environment protection, and industrial development have made efficient water resources management necessary. The concept of (virtual) water footprint (WF) has a considerable potential to help improve water resources management, especially in agriculture. In this research, WF of ...
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Food security, drought, environment protection, and industrial development have made efficient water resources management necessary. The concept of (virtual) water footprint (WF) has a considerable potential to help improve water resources management, especially in agriculture. In this research, WF of barley production in 15 major barley-producing provinces of Iran was estimated. WF consists of green (effective precipitation), blue (net irrigation requirements), gray (to dilute pollutants to the maximum acceptable concentration level) and white (irrigation losses) components. The results show that the average total WF in Iran’s national barley production for the period 2005-2011 is around 9172 MCM/year, of which the share of green, blue, gray and white WF were 37%, 19%, 17%, and 27 percent, respectively. Nearly 44 percent of total WF was related to the gray and white components, which is a considerable amount. Around 85 percent of the total WF in barley production is consumed in 15 major barley-producing provinces. Khorasan, Isfahan, and Fars provinces have the highest values of total WF in barley production, with 2364, 518 and 489 MCM/year, respectively. Among the 15 selected provinces, the average total WF in irrigated lands was estimated at around 3209 m3/ton with the contribution of green, blue, gray, and white components being 20%, 26%, 18%, and 36 percent, respectively. For rainfed lands, the average total WF was 2594 m3/ton with 89% and 11 percent of green and gray WF, respectively.