Structure for crop irrigation with controlled delivery of water directly to individual plants through a set-up of tubes or pipes refers to drip irrigation. Water influences crop growth in many ways. The severity and lack of water directly influences on the growth and yield of a crop. Growers can increase the yield and overcome the crop expenses by installing this system. For this purpose, two double rows of beds about 34-44 inches should be prepared. The distance between the furrows should be 18 inches and consist of two onion rows spaced 3 inches apart. Drip tapes are installed 2 to 3 inches deep in the bed center, between the two double rows, at the time of planting. The tape emitters are spaced 8- 12 inches apart.
Asma Hamid (Horticulturist)