Modeling the Impact of Water and Nitrogen Management in Paddy Fields of Temperate Cold Zone

Authors

  • Zhongxue Zhang, Jian Zhao, Zhijuan Qi

Abstract

In order to find the optimal water and nitrogen management model for increasing production, saving water and reducing emissions. In this study, two irrigation methods controlled irrigation and conventional flooding, 4 nitrogen fertilizer levels (N0:0 kg/hm2, N1:85kg/hm2, N2:110 kg/hm2, N3:135kg/hm2) were studied. The physical and chemical properties of the soil, greenhouse gas emissions and fertilizer residues, rice yield and quality were measured and the particle swarm optimization projection pursuit model was applied to comprehensively analyze the indicators. The results showed that both the two irrigation model coupling nitrogen fertilizer level result in lower soil pH. The rate of pH decrease increased with the increase of nitrogen fertilizer level. The decline rate of FN3 treatment was the fastest, and the average decline rate was 0.023/year.

Published

2020-02-28

Issue

Section

Articles