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[1]LIU Peng,YANG Gang,CHANG Wenqian,et al.Effects of Water and Nitrogen Management on Dry Matter Accumulation, Transportation, and Water and Nitrogen Use Efficiency of Broomcorn Millet in the Late Growth Stage[J].Research of Soil and Water Conservation,2019,26(04):139-145.

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Effects of Water and Nitrogen Management on Dry Matter Accumulation, Transportation, and Water and Nitrogen Use Efficiency of Broomcorn Millet in the Late Growth Stage

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 139-145 Column: Public date: 2019-06-11

Title:: Effects of Water and Nitrogen Management on Dry Matter Accumulation, Transportation, and Water and Nitrogen Use Efficiency of Broomcorn Millet in the Late Growth Stage

Author(s):: LIU Peng¹, YANG Gang¹, CHANG Wenqian¹, CHENG Bingwen³, ZHAO Shiwei^1,2; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China;
3. Guyuan Branch of Academy of Agriculture and Forestry Sciences, Guyuan, Ningxia 756000, China

Keywords:: broomcorn millet; net photosynthetic rate; dry matter; yield; water and nitrogen use efficiency

CLC:: S516;S158.3

DOI:: -

Abstract:: To provide high-yield and efficient utilization of water and fertilizer resources in the arid and semi-arid areas of China, broomcorn millet, Gumi 21, was adopted as test crop. Under the conditions of pot experiment, a completely random combination design was adopted, and the water contents were set as 50%, 70%, and 90% of the field water holding capacity. Nitrogen use rates such as 0, 0.05, 0.10 g N/kg dry soil (converted to pure nitrogen 0, 75, 150 kg/hm²) were set. The total leaf area, net photosynthetic rate, dry matter accumulation and transport, water use efficiency and nitrogen use efficiency of different water and nitrogen treatments in the late growth stage of broomcorn millet were examined. The results showed that suitable water and nitrogen conditions could delay the senescence rate of leaves, maintain a high total leaf area, significantly increase the net photosynthetic rate of the broomcorn millet during the grain filling stage, promote the accumulation and transport of dry matter after the grain filling stage, and increase the yield; the water use efficiency of broomcorn millet increased with the increase of nitrogen application rate, and decreased with the increase of soil water level. After the application of nitrogen more than 75 kg/hm², water use efficiency of broomcorn millet presented the decreasing trend. The agronomic utilization efficiency, nitrogen fertilizer physiological utilization efficiency and nitrogen fertilizer partial productivity of broomcorn millet increased with the increase of soil water content, and decreased with the increase of nitrogen application rate. The 70% of field water holding capacity and nitrogen application rate of 75 kg/hm² can regulate the production of broomcorn millet mainly by delaying the senescence rate of leaves, enhancing the photosynthetic output capacity of functional leaves during the filling stage, increasing the accumulation of dry matter after the filling stage, promoting the transport of dry matter, improving water use efficiency and nitrogen utilization efficiency. Under the experimental conditions, 70% field water holding capacity and topdressing nitrogen rate of 75 kg/hm² is the optimal water and nitrogen combination.

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