hamdolah eskandari; ashraf alizadeh
Abstract
A field experiment was conducted in Selseleh County, Lorestan Province, during 2015-16 growing season to evaluate the effects of planting pattern and partial root zone irrigation (alternate furrow irrigation) on water and land productivity under wheat and Persian clover intercropping system. The experiment ...
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A field experiment was conducted in Selseleh County, Lorestan Province, during 2015-16 growing season to evaluate the effects of planting pattern and partial root zone irrigation (alternate furrow irrigation) on water and land productivity under wheat and Persian clover intercropping system. The experiment was carried out as a two-factor factorial with three replications. The first factor was irrigation management at two levels of conventional (I1) and partial root-zone irrigation (I2) based on root depth, and the second was planting pattern including sole wheat (W), sole Persian clover (C), wheat-Persian clover alternate-row intercropping (WC1) and wheat-Persian clover within-row intercropping (WC2) systems. Water consumption, leaf relative water content, grain yield, water productivity and land equivalent ratio were used to evaluate the treatments. Water consumption of all planting patterns in partial root-zone irrigation system was significantly (P≤0.01) lower than that of conventional irrigation. Grain yield of wheat and Persian clover in partial root-zone irrigation was lower than that of conventional irrigation, where wheat and Persian clover yield decreased by 27% and 36%, respectively. However, grain yield and water consumption reductions resulted in higher water productivity (23%, 92%, 51%, and 44% in sole wheat, sole Persian clover, wheat-Persian clover alternate-row intercropping, and within-row intercropping, respectively). Land equivalent ratio of intercropping in partial root-zone irrigation was 19% more than that of conventional irrigation, suggesting that intercropping reduced the negative effect of lower water supply, because relative water content of wheat and Persian clover was higher in intercropping compared to sole cropping. Therefore, partial root-zone irrigation can be suggested as an effective method for increasing water productivity in grain production of wheat and Persian clover.
h e; a a
Abstract
This research was carried out to evaluate the effect of drought on germination, growth, and fruit yield of okra in laboratory and field. Laboratory experiment was conducted as a two-factor factorial in agricultural laboratory of Khuzestan Payame Noor University based on completely randomized design in ...
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This research was carried out to evaluate the effect of drought on germination, growth, and fruit yield of okra in laboratory and field. Laboratory experiment was conducted as a two-factor factorial in agricultural laboratory of Khuzestan Payame Noor University based on completely randomized design in three replications. The first factor was seed priming (including control and seed priming with water and KNO3) and the second factor was drought stress (matric potentials of -0.3, -0.6, -0.9 and -1.2 MPa). Results indicated that the highest germination percentage was observed under no-stress and hydro priming conditions. Seed germination was decreased with increase in stress, where in control treatment i.e. without hydro priming, increasing drought stress from the first to third level resulted in 72.3 percent reduction in germination percentage. Hydro priming improved seed germination under drought stress and no-stress conditions. The field experiment was carried out during 2015-16 growing season based on RCBD in three replications. The irrigation intervals treatment was based on 70, 100, 130 and 160 mm evaporation from pan. İncreasing irrigation intervals reduced dry matter accumulation, leaf area index, plant height, friut number per plant, and biological and fruit yield of okra. Increasing irrigation interval from the firt level to the second, third, and fourth levels decreased fruit yield up to 9%, 26%, and 31 percent, respectively. Therefore, for optimum yied, okra should experience no drought stress during growth and friut formation. Thus, irrigation after 70 mm evaporation from evaporation pan can be advisable as an irrigation interval for okra. However, since friut yield reduction in the second level of irrigation interval was not considerable and considering economic issues, it may be possible to suggest this irrigation inerval, but it requires more research work.