Irrigation scheduling of squash under drip irrigation and black plastic mulch in the Central Jordan Valley
1987
Safadi, A.S.
The study results showed no significant differences between the three treatments of irrigation schedules at 30, 50, and 80 KPa for winter and spring seasons in respect to yield, total water supplied, irrigation amounts, application water efficiency, water use efficiency, vertical root length, horizontal root length and oven-dry root weight. The plants under the three treatments consumed average water amounts of 12.79, 12.75 and 12.44 cm, respectively, during the winter season and produced average yields of 19.4, 21.6, and 22.0 /ha, respectively. During the spring season the plants consumed average water amounts of 15.28, 13.98, and 14.97 cm and produced average yields of 8.6, 7.4 and 7.6 t/ha for all of the three treatments. Average water use efficiencies for the 30, 50 and 80 KPa treatments were 1.58, 1.79 and 1.88 t/ha/cm for the winter season, and 0.56, 0.58 and 0.51 t/ha/cm for the spring. Number of irrigation was significantly lower in the 80 KPa when compared to the 30 KPa treatment during the winter. During the spring significant differences in the number of irrigations were revealed between 30 and 50 KPa, and the 30 and 80 KPa treatments. Recalibration of the yield portion of the soil water management simulation model (CRPSM) for squash for both seasons resulted in new sets of growth stage weighing factors (lambdas) and maximum field attainable yields. Better calibration was obtained during the winter due to disease and temperature effects during the spring. The different water management options provided by the model were tested to select the best irrigation schedules that will maximize yields and optimize water use efficiency, and cut down field trials to be tested in future studies for achieving lower cost and less time span
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