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首页> 外文期刊>Journal of Zhejiang University. Science >Studies on nutrient uptake of rice and characteristics of soil microorganisms in a long-term fertilization experiments for irrigated rice
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Studies on nutrient uptake of rice and characteristics of soil microorganisms in a long-term fertilization experiments for irrigated rice

机译：水稻长期灌溉施肥试验中水稻养分吸收及土壤微生物特征的研究

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摘要

The ecosystem characteristics of soil microorganism and the nutrient uptake of irrigated rice were investigated in a split-block experiment with different fertilization treatments, including control (no fertilizer application), PK, NK, NP, NPK fertilization, in the main block, and conventional rice and hybrid rice comparison, in the sub block. Average data of five treatments in five years indicated that the indigenous N supply (INS) capacity ranged from 32.72 to 93.21 kg/ha; that indigenous P supply (IPS) capacity ranged from 7.42 to 32.25 kg/ha; and that indigenous K supply (IKS) capacity ranged from 16.24 to 140.51 kg/ha, which showed that soil available nutrient pool depletion might occur very fast and that P, K deficiency has become a constraint to increasing yields of consecutive crops grown without fertilizer application. It was found that soil nutrient deficiency and unbalanced fertilization to rice crop had negative effect on the diversity of the microbial community and total microbial biomass in the soil. The long-term fertilizer experiment (LTFE) also showed that balanced application of N, P and K promoted microbial biomass growth and improvement of community composition. Unbalanced fertilization reduced microbial N and increased C/N ratio of the microbial biomass. Compared with inbred rice, hybrid rice behavior is characterized by physiological advantage in nutrient uptake and lower internal K use efficiency.
机译：在分块试验中研究了不同施肥方法的土壤微生物生态系统特征和灌溉水稻的养分吸收，这些施肥方法包括控制（不施肥），主要施肥和常规施肥（PK，NK，NP，NPK，NPK）水稻与杂交水稻的比较，在分块中。五年中五种处理方法的平均数据表明，本地氮供应（INS）能力范围为32.72至93.21 kg / ha；本地磷供应量（IPS）的范围为7.42至32.25公斤/公顷；土著钾素供应（IKS）的范围从16.24到140.51 kg / ha，这表明土壤中有效养分的消耗可能很快发生，而磷，钾的缺乏已成为不施用肥料的连续作物产量增加的制约因素。结果表明，土壤养分缺乏和施肥不均衡对土壤微生物群落多样性和微生物总生物量具有负面影响。长期肥料实验（LTFE）还表明，氮，磷和钾的平衡施用促进了微生物量的增长和群落组成的改善。施肥不平衡会降低微生物氮素，并增加微生物生物量的碳氮比。与自交稻相比，杂交稻的行为特征在于养分吸收方面的生理优势和较低的内部钾利用效率。

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