Effects of water-nitrogen combination on dry matter, nitrogen accumulation and yield of winter wheat

doi:10.13287/j.1001-9332.202008.029

Abstract

Abstract: In two growing seasons of wheat (2015-2017), we conducted a field trial with Taishan 28 in Tai'an Academy of Agricultural Science Feicheng experimental base, Tai'an City, Shandong Province. There were four irrigation levels of 150 (A₁), 300 (A₂), 450 (A₃), and 600 (A₄) m³·hm^-2, and four nitrogen application levels of 90 (B₁), 135 (B₂), 180 (B₃), and 225 (B₄) kg·hm^-2. We examined the effects of the combination effects of irrigation and nitrogen on dry matter accumulation and transport, nitrogen accumulation and transport, water consumption and utilization, photosynthetic characteristics, wheat grain yield and yield components of wheat. The results showed that dry matter accumulation, nitrogen accumulation, vegetative organs production, storage and the transportation volume to grains of the dry matter and nitrogen, and dry matter and nitrogen accumulation of grain in the mature stage of wheat all reached the maximum in A₃B₃ treatment, which were significantly different from other treatments. Under all the nitrogen treatments, soil water consumption in the 60-200 cm soil layer was A₃>A₄>A₂>A₁. Water use efficiency and nitrogen use efficiency in A₃B₃ treatment were higher than that under A₃B₄, A₄B₃ and A₄B₄. The net photosynthetic rate, stomatal conductance and transpiration rate of flag leaves from 7 to 28 days after flowe-ring were all significantly higher in A₃B₃ treatment, which was conducive to the photosynthetic synthesis of carbohydrates in wheat. The interaction effect of water and nitrogen addition significantly affected grain yield and yield components. Wheat yield was the highest in A₃B₃ treatment which reached at 9400 kg·hm^-2. In conclusion, the treatment with irrigation of 450 m³·hm^-2 and nitrogen of 180 kg·hm^-2 could significantly improve dry matter and nitrogen accumulation, and promote transportation volume of the dry matter and nitrogen to grain. Compared with the high water and nitrogen treatment, it could effectively increase water use efficiency and nitrogen use efficiency, enhance photosynthetic capacity of flag leaf, produce more carbohydrate, and increase grain yield.

Key words: wheat, dry matter, nitrogen use efficiency, photosynthetic character, yield

LYU Guang-de, WANG Chao, JIN Xue-mei, XU Jia-li, WANG Rui-xia, SUN Xian-yin, QIAN Zhao-guo, WU Ke. Effects of water-nitrogen combination on dry matter, nitrogen accumulation and yield of winter wheat[J]. Chinese Journal of Applied Ecology, 2020, 31(8): 2593-2603.

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