Chinese Journal OF Rice Science >
Effects of Nitrogen Fertilizer Level and Planting Density on Changes in Soil Nutrient contents and Nitrogen Use Efficiency in Rice
Received date: 2019-04-12
Revised date: 2019-11-04
Online published: 2020-01-10
【Objetive】In order to improve soil fertility, rice grain yield, and nitrogen fertilizer utilization efficiency,【Method】a two-factor field experiment (nitrogen fertilizer level and planting density) was carried out in paddy fields in Rencheng District, Jining City, Shandong Province. The nitrogen application rates were as follows: zero nitrogen (N1), 0 kg/hm2; low nitrogen (N2), 216 kg/hm2; medium nitrogen (N3), 288 kg/hm2; and high nitrogen (N4), 360 kg/hm2, coupling with three planting densities including low density(D1, 240 000 hill/hm2), medium density(D2, 270 000 hill/hm2) and high density(D3, 300 000 hill/hm2). The soil nutrient contents and nitrogen use efficiency were measured in mature stage under different nitrogen fertilizer levels and planting densities. 【Result】The contents of nitrogen, phosphorus, potassium and organic matter decreased significantly with the deepening soil layer. Among them, the content of alkali nitrogen in D3N4 treatment decreased by 60.8%, and the content of available phosphorus in D3N3 treatment decreased by 72.7%. With the increase of nitrogen application rate, the soil pH and organic matter content decreased, and the available potassium content increased,the partial productivity of fertilizer and nitrogen fertilizer agricultural utilization efficiency decreased, and yield increased first and then decreased. With the increase of planting density, the soil pH and available phosphorus decreased, the alkali nitrogen content of surface soil increased slightly, and the organic matter content, yield and fertilizer partial productivity increased first and then decreased, and the nitrogen agricultural utilization efficiency decreased. 【Conclusion】Under D2N3, the rice yield was the highest, reaching 14 615.3 kg/hm2. At the same density, the nitrogen fertilizer level of N2 help give rise to higher rice yield, nitrogen fertilizer agricultural utilization efficiency and fertilizer partial productivity. The research results can be referenced in actual production.
Siping LI, Lusheng ZENG, Lipeng WU, Yuxiao ZHANG, Junrui XIE, Xiaodong DING . Effects of Nitrogen Fertilizer Level and Planting Density on Changes in Soil Nutrient contents and Nitrogen Use Efficiency in Rice[J]. Chinese Journal OF Rice Science, 2020 , 34(1) : 69 -79 . DOI: 10.16819/j.1001-7216.2020.9045
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