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Hossein Ebrahimnezhad; Ali Keramatzadeh; Farshid Eshraghi; azam rezaee
Abstract
One of the important problems in the agricultural sector of Iran is the low productivity of inputs, especially water. In this study, in addition to determining the physical and economic productivity of water, the factors affecting these productivities in the production of orange in Ghaemshahr County ...
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One of the important problems in the agricultural sector of Iran is the low productivity of inputs, especially water. In this study, in addition to determining the physical and economic productivity of water, the factors affecting these productivities in the production of orange in Ghaemshahr County of Mazandaran Province were also investigated. For these purposes, three indexes of water use productivity including crop per drop (CPD), Gross benefit per drop (BPD), and net benefit per drop (NBPD) were used. Also, regression analysis was used to investigate the factors affecting water productivity. Necessary information was collected by completing 162 questionnaires from gardeners in the study area in 2018-19. Data analysis was also performed using Eviews7 software. The results of the analysis of water productivity indices showed that the average CPD index for orange was 6.9 kg /m3, BPD index was 47500 Rials and NBPD at three interest rates of 10%, 12%, and 15% was 29000, 28000, and 26600 Rials, respectively. Well’s discharge rate, days when wells were used, time spent for irrigation, the number of irrigations, age of trees, the distance between the trees, age of trees, cost of pesticide, and cost of fertilizer were the factors affecting water productivity. Among the mentioned variables, the variable of “time spent for irrigation” had the greatest effect on the physical water productivity, through the effect on the amount of irrigation water. Due to the negative effect of well discharge rate, the number of irrigations, and time spent on irrigation on the economic productivity of water, it is recommended to irrigate the orange trees in accordance with their needs and in a way that less water is applied.
hamed zamani; d a; h m; f a
Abstract
In order to investigate the effects of different irrigation regimes on yield quantity and quality of flue-cured tobacco cv. K326, an experiment was carried out based on a randomized complete blocks design (RCBD) with three replications, at Tirtash Tobacco Research Center, in 2011. Treatments were combination ...
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In order to investigate the effects of different irrigation regimes on yield quantity and quality of flue-cured tobacco cv. K326, an experiment was carried out based on a randomized complete blocks design (RCBD) with three replications, at Tirtash Tobacco Research Center, in 2011. Treatments were combination of W1= 40%, W2=60%, W3=80%, and W4=100 percent crop water requirement with D1=5, D2=10, D3=15 days irrigation interval with two control treatments (without irrigation (R) and furrow irrigation (I)). The results showed that treatment W4D1, W4D2, W4D3, W3D1, W3D2, W3D3, W2D1, and W1D1 had statistically significant difference with the other treatments and had more dry leaf yield. Also, the minimum leaf chlorine content was observedin W4D2, W3D1, W2D1, W2D2, W1D3, and Rtreatments. Under W4D2, W3D1, W3D3, W2D1, W1D1, W1D2, and W1D3 treatments, tobacco had statistically significant difference with other treatments and had higherprice. Also, the minimum gross income was obtained under W2D2, W2D3, W1D3, I, and R Treatments.