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Abstract
SUMMARY
The main objectives of the present work are, to study the effect of soil moisture level, antitranspirants concentration and K fertilization rate on the growth, yield and the elemental composition of summer squash, without or with soil mulching. Also, the effect of these treatments on the available K in soil was discussed.
Two pot experiments were carried out at the Faculty of Agriculture, Saba-Bacha, Alexandria University, Alexandria. Experiment (I) aimed to find out, the effect of different soil moisture levels, different rates of potassium fertilizer, at different concentrations of antitranspirant material, without mulching on growth, yield and elemental composition of squash plants. On the other hand, the experiment (II) aimed to find out, the effect of different soil moisture levels, and different rates of potassium fertilizer at different concentrations of antitranspirant material, with mulching on growth, yield and elemental composition of squash plants. A split-split plot design with three replicates was adopted, for each experiment. The main plots were exposed to irrigation, to maintain three levels of moisture in soil namely, 30%, 45% and 60% of field capacity. The sub-plots were fertilized with three different rates of potassium (0, 75 and 150 kg K2O/fed) as K2SO4 (48% K2O). The sub sub plots were allocated plastic emulsion, represented film forming antitranspirant type material, at different concentrations (Zero, 25 and 50 gm/L). After 65 days from planting, the fresh and oven-dry weights of squash plants (shoot) were estimated. Also, the fruit yield per plant was measured. Soil samples were collected from the two experiments after 65 days of planting for soil