Effects of Nitrogen Fertilizer Topdressing Ratio on Changes of Soil Nitrate Nitrogen and Nitrogen Use Efficiency in Winter Wheat
Song Wenting
Han Mingming
Chen Jin
Pang Dangwei
Yang Dongqing
Jin Min
Abstract：In order to provide theory basis for reasonable application of nitrogen fertilizer in winter wheat production in the Huang-Huai-Hai plain of China,the effects of different nitrogen fertilizer topdressing ratios on time-space distribution of soil NO3-N,apparent budget of soil nitrogen and nitrogen use efficiency in various growth stages of winter wheat were studied with Shannong 8355 and Jimai 22 as materials.The study were conducted in wheat growing season during 2015 ～2016,and four nitrogen treatments (without applying N fertilizer (T1);N application rate of 240 kg · hm-2 with topdressing ratio as 7∶3 (T2),5∶5 (T3) and 3∶7(T4)) were set up.The results showed that under the same nitrogen application rate condition,the NO3-N content in deep soil layers of T2 treatment in early growth stage was increased,so the NO3-N content was reduced in 0 ～60-cm soil layers at late growth stage,which could not meet the needs of wheat for nitrogen.The surplus amount of soil nitrogen of T4 treatment was significantly reduced in early growth stage,which reduced the nitrogen deficiency at late growth stage,and the nitrogen use efficiency and grain yield (Shannong 8335 of 9 399 kg · hm-2,Jimai 22 of 9 572 kg · hm-2) of winter wheat both showed the highest value.In conclusion,the most appropriate nitrogen fertilizer topdressing ratio treatment was T4 treatment with the ratio as 3∶7 which gave consideration to high yield and high nitrogen use efficiency.
Keywords：Winter wheatNitrogen fertilizer topdressing ratioNitrate nitrogenSurplus amountNitrogen use efficiency
Publication Date：2017-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 88-94 )