Effects of nitrogen application level on soil nitrate accumulation and ammonia volatilization in high-yielding wheat field
Wang, D.; Yu, Z.; Yu, W.; Shi, Y.; Zhou, Z.
Ying Yong Sheng Tai Xue Bao 17(9): 1593-1598
The study showed that during the period from sowing to pre-wintering, the soil nitrate in high-yielding wheat field moved down to deeper layers, and accumulated in the layers below 140 cm. An application rate of 96 similar to 168 kg N center dot hm(-2) increased the nitrate content in 0 similar to 60 cm soil layer and the wheat grain yield and its protein content, and decreased the proportion of apparent N loss to applied N and the ammonia volatilization loss from basal,nitrogen. Applying 240 kg N center dot hm(-2) promoted the downward movement of soil nitrate and its accumulation in deeper layers, increased the proportion of apparent N loss to applied N and the ammonia volatilization loss from basal nitrogen, had no significant effect on the protein content of wheat grain, but decreased the grain yield. The appropriate ap plication rate of nitrogen on high-yielding wheat field was 132 similar to 204 kg N center dot hm(-2).