[1]DAI Ming,ZHANG Yimin.Effects of Coupling of Water and Nitrogen on the Accumulation of Soil Nitrogen in Root Zone and Yield of Rice[J].Research of Soil and Water Conservation,2020,27(03):168-173.
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Effects of Coupling of Water and Nitrogen on the Accumulation of Soil Nitrogen in Root Zone and Yield of Rice
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
168-173
Column:
目次
Public date:
2020-04-20
- Title:
- Effects of Coupling of Water and Nitrogen on the Accumulation of Soil Nitrogen in Root Zone and Yield of Rice
- CLC:
- S665.1
- DOI:
- -
- Abstract:
- The effects of water-nitrogen coupling on soil nitrogen accumulation in rice root area and yield were studied through long-term observation experiments for 5 consecutive years(2013—2017), which can provide theoretical basis and technical reference for maximizing the ecological effect of fertilizer and optimizing nitrogen management in intensive farmland. The results showed that:(1)the coupling of water and nitrogen significantly promoted the growth of rice plants; the plant height, root length, leaf area index, stem diameter and aboveground and belowground biomass of the single plant were all higher than those of W1N1, among which the values of W2N3,W3N1 and W3N2 were the largest, while the value of W1N1 was the smallest;(2)the inorganic nitrogen content in soil profile changed from the high level to low level from top to deep layers, and the difference between water-nitrogen coupling treatments mainly occurred in the 10 cm layer, and inorganic nitrogen content in 30 cm layer tended to be the same, indicating that the water-nitrogen coupling had little effect on the inorganic nitrogen leaching in deep soil in this study;(3)different parts of the plant showed great differences in nitrogen accumulation, with the highest nitrogen accumulation in ear, followed by leaf, and the lowest carbon and nitrogen accumulation in root;(4)nitrogen absorption rate, nitrogen utilization rate, nitrogen partial productivity and nitrogen concentration increased first and then decreased with the increase of nitrogen application amount; on the whole, the inorganic nitrogen content in soil profile changed from high level to low level from top to deep layers, and the difference between different nitrogen application treatments mainly occurred in 10 cm layer; the inorganic nitrogen absorption in rice soil reached to the maximum under W2N2 treatment, and then decreased to a certain extent, presenting an inverted V-shaped pattern; the inorganic nitrogen residue in rice soil reached to the minimum under W2N2 treatment, and then increased to a certain extent, presenting V-shaped pattern;(5)the coupling of water and nitrogen had obvious influence on biomass accumulation and nitrogen absorption and utilization of rice; the coupling of water and nitrogen significantly increased the nitrogen uptake, nitrogen absorption rate, nitrogen utilization rate and partial nitrogen productivity of rice;(6)water-nitrogen coupling promoted the increase of rice panicle number, panicle grain number, panicle length, panicle width, 1000-grain weight and yield under the treatments, among which were the largest under W2N3,W3N1 and W3N2 and were the smallest under W1N1. The above results indicate that the coupling of water and nitrogen can promote the accumulation of soil nitrogen in rice root area and yield.
- References:
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Last Update:
2020-04-30