Abstract:

The purpose of this study was to explore the effect of foliar zinc spraying on rice growth, yield and zinc content in rice under the condition of chemical fertilizer reduction. By setting up fertilizer reduction gradients of 5%, 10% and 20% in field experiments, zinc fertilizer was sprayed at the booting stage of rice. Experiments have shown that foliar zinc spraying can promote rice growth compared with conventional fertilization. Compared with conventional fertilization, the seed setting rate, 1000-grain weight and yield of rice increased by 3.64%, 4.37% and 8.17%, respectively, and the contents of nitrogen, zinc and phosphorus in rice increased by 25.33%, 43.14% and 11.14%, respectively, under the condition of 5% reduction of chemical fertilizer. In addition, with the decrease of chemical fertilizer use, the soil organic matter content increased, and the soil organic matter content increased by 9.91% when the chemical fertilizer was reduced by 20%. The application of foliar zinc fertilizer can improve rice yield, increase the level of zinc in rice, and obtain the maximum effect under the condition of 5% reduction of chemical fertilizer, which can be applied and promoted as a technical measure for chemical fertilizer reduction and efficiency increase.

Key words: fertilizer reduction, zinc fertilizer, foliar sprays, rice yield