Studies on the Efficient Utilization and Coupling Effect of Nitrogen-water in Wheat

doi:10.7668/hbnxb.2018.05.032

Abstract

Abstract: Semiwinter wheat variety Zhoumai 22 was used as material to study the effects of different water-nitrogen combinations on photosynthetic characteristics,water use efficiency,water consumption and yield during the grain filling period of wheat,in order to determine the optimal combination of high yield and high efficiency utilization of water-nitrogen for wheat.The experiment was carried out using pot cultivation under rain shelter,setting up five water level:the relative soil water content of 55% (H1),65% (H2),70% (H3),75% (H4) and 85% (H5) from jointing to mature period on the basis of the relative soil water content of 55% from returning green stage to jointing stage,and 3 nitrogen level:no nitrogen (0 kg/ha,N0),medium nitrogen (195 kg/ha,N1) and high nitrogen (270 kg/ha,N2). The results showed that nitrogen fertilizer had a extremely significant effect on yield,water consumption coefficient and fertilizer use efficiency,and the interaction between water and nitrogen was extremely significant. Under the conditions of 65%-70% soil relative water content and medium nitrogen,the net photosynthetic rate and transpiration rate of wheat were significantly higher than that of other treatments during the whole grain filling period,of which the transpiration rate of 10 d after flowering was over 11 mmol/(m²·s),the grain filling rate increased 15%~64%,the water use efficiency was over 1.7 g/kg,while the partial productivity and the agricultural utilization of nitrogen fertilizer were over 15.1,7.5 kg/kg,respectively. It was the best combination for wheat to obtain high efficiency utilization of water-nitrogen,maximum grain filling rate and grain yield. Thus,it is concluded that the combination of 195 kg/ha nitrogen fertilizer and 65%-70% soil relative water content from jointing stage to maturity stage not only give the highest yields,but also have the highest WUE,nitrogen partial productivity(NPEP) and nitrogen agronomic use efficiency(NAUE).

Key words: Wheat, Water-nitrogen coupling, WUE, Yield

CLC Number:

LI Wuchao, LI lei, WANG Wei, LI Jingjing, YIN Jun. Studies on the Efficient Utilization and Coupling Effect of Nitrogen-water in Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(5): 232-238. doi: 10.7668/hbnxb.2018.05.032.

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