The Effects of Water and Nitrogen Regulation on the Growth and Yield of Sweet Pepper

To explore the effects of water and nitrogen regulation on the growth and yield of sweet peppers under subsurface drip irrigation, a crop water and nitrogen regulation experiment was conducted using the "Aisheng Qiamen" sweet pepper as the research object at the Yimin Irrigation Experiment Station in Minle County, Zhangye City, Gansu Province. A total of 9 water and nitrogen treatments and 1 fully irrigated treatment (CK) were set up at each growth stage. The results indicated that different water and nitrogen treatments had significant effects on the plant height, stem diameter and yield of sweet peppers. Under the same irrigation level, the plant height, stem diameter and yield of sweet peppers showed a trend of increasing first and then decreasing with the increase of nitrogen application rate. Among them, the plant height and yield reached the maximum under the W1N2 treatment, and the yield was the best under the W2N2 treatment. Therefore, moderate water and nitrogen regulation is conducive to the increase of plant height, stem diameter and yield of sweet pepper under drip irrigation.