Effects of Different Irrigation Methods on the Growth and Physiology of Hot Pepper

[Objective] The study aimed to provide scientific basis for water saving irrigation of hot pepper.[Method] The effects of normal irrigation,root-zone located irrigation and root-zone alternative irrigation on the growth and physiological indexes were analyzed through potting test.[Result] When the lower irrigation limit was 75%θF,the plant height of root-zone located irrigation was significantly lower than that of normal irrigation and root-zone alternative irrigation;compared with normal irrigation,the leaf width of root-zone located irrigation was decreased obviously;the chlorophyll content of normal irrigation was highest,that of root-zone alternative irrigation was secondary and that of root-zone located irrigation was lowest;the proline content of normal irrigation was lowest,that of root-zone alternative irrigation was middle and that of root-zone located irrigation was highest.When the irrigation methods were same,the chlorophyll contents of different lower irrigation limits were shown as: 75%θF65%θF55%θF.When the lower irrigation limits were 55%θF and 65%θF,the proline content of root-zone alternative irrigation was significantly higher than that of root-zone located irrigation.When the irrigation methods were same,the leaf width was decreased significantly along with the decreasing of lower irrigation limit.Under the same lower irrigation limit,the leaf width of root-zone alternative irrigation was significantly bigger than that of root-zone located irrigation.[Conclusion] Controlling root-zone alternative irrigation was most watersaving and efficient irrigation method.