Effect of Irrigation Water Quantities and Planting Spacing on Hot Pepper Yield and Efficient Water Use

E. R. Al-Gharibi, A. M. Abu-Awwad


A study was carried out during 2001 growing season, at the Faculty of Agriculture Farm located at the Jordan University Experimental Station in Amman, to study the effects of irrigation quantities, planting density and their interaction on hot pepper yield, and to investigate actual Evapo-Transpiration (ETc) of hot pepper crop that gives maximum yield per unit volume of water per unit area for a specified planting density. A split plot in a randomized complete block design was carried out with four replications using drip irrigation system on a clay soil. Three levels of in-row plant spacing were used (S1 (30cm), S2 (60cm) and S3 (90cm) and five levels of irrigation quantities (W1 ( ), W2 ( ), W3 ( ), W4 ( ) and W5 ( times evaporation depth from Calss-A pan). Irrigation water applied was adjusted according to the crop growth stage in which of the desired amount was applied at the first stage of plant life (seedling), at the second stage (development) and at the last stage (maturity and late). Each plot was 13.5 m2 with three laterals 5-m long, and 0.9 m between the laterals.
In general, increasing applied irrigation water and/or plant population increased actual consumptive use. Seasonal actual consumptive use varies from 397, 376 and 370 mm at W1 to 1153, 1116 and 1095 mm at W5 irrigation treatments, for S1, S2 and S3 treatments, respectively. Pepper yield increases with the increasing amount of irrigation water applied for all spacing treatments form W1 to W5, respectively. Also, yields increase with increasing plant population (reducing plant spacing).
The WUE is reduced as irrigation water applied increases because yield is increasing at decreasing increments as compared to the amount of irrigation water applied. Also, increasing in-row plant spacing from S1 to S3 significantly reduced the WUE. In general, among all spacing and irrigation treatments it is recommended to use 30 cm in-row plant spacing accompanied with W3 ( times evaporation depth from Calss-A pan) for higher yield and WUE and wise water application.

الكلمات المفتاحية

Hot pepper, Irrigation, Plant spacing, Water use and Evapotranspiration

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