%A Sha-Sha LI,Geng MA,Wei-Xing LIU,Juan KANG,Yu-Lu CHEN,Yang-Yang HU,Pan-Pan ZHANG,Chen-Yang WANG %T Effects of Long-Term Irrigation and Nitrogen Regimes on Soil Nitrogen Content and Paste Property of Wheat Grain %0 Journal Article %D 2018 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2018.01067 %P 1067-1076 %V 44 %N 7 %U {https://zwxb.chinacrops.org/CN/abstract/article_6480.shtml} %8 2018-07-10 %X

Nitrogen (N) and water contents in soil are primary elements affecting grain yield and quality of wheat. For optimizing the water and fertilizer management in high-quality and high-efficiency wheat production, a split-plot experiment was carried out in the long-term fertilization fields in Wenxian county, Henan province in the 2014-2015 and 2015-2016 winter wheat seasons. The main-plot factor was irrigation in three levels (W0 for no irrigation, W1 for 750 m 3 ha -1 at jointing, and W2 for 750 +750 m 3 ha -1 at jointing + anthesis), and the split-plot factor was N rate in four levels (0, 180, 240, and 300 kg ha -1). Yumai 49-198, a medium-gluten variety, was the unique variety used in the experiment. The soil NO3 --N content in the 0-20 cm soil layer was significantly lower, whereas, the amylopectin and starch contents, starch peak viscosity and final viscosity were significantly higher in W1 and W2 treatments than in W0 treatment. Under irrigation conditions, the volume of small starch granule (<5.0 μm) increased as compared with that under W0 condition, with the increase of 3.4% in W1 and 4.8% in W2 in the 2014-2015 wheat season. Nitrogen application improved soil NO3 --N content but negatively affected amylose content and the percentage of small starch granules. Amylopectin and starch contents, peak viscosity, through viscosity, and final viscosity increased with N application ranging from 0 to 240 kg ha -1. The correlation analysis revealed positive correlations (P < 0.01) of NO3 --N with starch yield, peak viscosity, through viscosity, and final viscosity. Results showed that under N 240 kg ha -1 and W1 condition the nitrate content in topsoil layer was 19.64-20.55 mg kg -1 having higher grain yield and good starch property.