The effects of different irrigation regimes on yield and yield components Of Sweet pepper (Capsicum annum) under greenhouse conditions

Deficit irrigation has different effects on growth, metabolism and plant performance, which has a major impact on photosynthesis. The goal of this study was to investigate the effect of different irrigation levels on yield and water productivity of sweet pepper (Capsicum annuum L.) in greenhouse condition. Five irrigation levels are evaluated on yield and yield components of Sweet pepper. The research was done based in completely randomized design including 3 replications as pot planting in Gorgan University of Agricultural Sciences and Natural Resources during 2016. In this study, five irrigation regimes existed of (70, 85, 100, and 125% of water requirement). The results inducted that the effect of different irrigation regimes on fruit number, fruit fresh weights, and water productivity was highly significant (p < 0.01), but fruit dry weights and yield were significant at 5 percent levels (p < 0.05). In conclusion, the results showed that the highest of Yield and water productivity in 100 percent of the requirement. the results showed that sweet pepper plants are sensitive to the deficit and over irrigation, increasing of irrigation levels from 100 to 125 percent of water requirement has resulted to the redaction of yield and water productivity to 7.1 and 42.6 percent, respectively. However, increasing irrigation levels from 100 to 85 percent of water requirement has resulted in the redaction of yield and water productivity to 69.6 and 63.9 percent, respectively. The results showed that with decreased and increased in water irrigation level, fruit fresh and dry weights and Fruit number were significantly decreased