Effect of planting distances and varieties on the yield of three cucumber hybrids (Cucumis sativus L.) using drip irrigation under protected cultivation conditions

A field experiment was carried out in one of the plastic houses of the College of Agriculture, University of Kirkuk during the 2018-2019 agricultural season, to study the effect of three cultivation distances and three cucumber hybrids Cucumis sativus L. hybrids and their interaction on some of the characteristics of the cucumber plant using the drip irrigation system under protected cultivation conditions. The experiment included 18 treatments that consisted of matching three hybrids of cucumber (FAEQ F1, DALIA F1, and BARQ F1) with three distances between plants (40, 30, 20) cm. A factorial experiment was carried out according to the design of randomized complete sectors (R.C.B.D) and by the split plates method and with three replications. The significance of differences between the averages was tested according to the least significant difference L.S.D. between the arithmetic means and at a probability level p < 0.01 and p < 0.05. The results showed the significant effect of most of the studied treatments. It gave the highest significant value for the treatment of interaction between cucumber varieties and the interaction between V 3 D 1 and V 3 D 2 in characteristics of plant height and percentage chlorophyll in the plant, which reached (3.197 m plant −1 and 57.283%), respectively.