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通过不同土壤类型养分测定与不施氮空白区试验,分析了不同土壤类型养分与水稻基础产量的关系,初步明确了不同土壤类型不施氮空白区每100 kg基础产量稻谷需氮量及土壤氮当季利用率。结果表明,潴育型水稻土类4个土种土壤有机质、全氮、碱解氮、速效钾含量及不施氮空白区水稻基础产量明显高于脱潜型水稻土类4个土种,速效磷含量两者较为接近;同一土种不同农田土壤中全氮、有机质与碱解氮的含量相对稳定,空间变异相对较小;8个土种土壤有机质含量与水稻基础产量均呈极显著相关;8个土种土壤有机质含量均对不施氮空白区水稻基础产量起关键作用,极显著大于全氮、碱解氮、速效磷、速效钾所起的作用。根据试验结果建立了不同土种不施氮空白区水稻基础产量模型,模拟值与实测值吻合度较高;脱潜型水稻土4个土种不施氮空白区每100 kg稻谷平均需氮量为1.78 kg(1.75~1.81 kg),潴育型水稻土4个土种则为2.09 kg(2.04~2.14 kg);脱潜型水稻土类4个土种土壤氮当季利用率平均为36.4%(35.0%~37.2%),潴育型水稻土类4个土种土壤氮当季利用率平均为41.6%(38.9%~43.3%)。
The relationship between nutrients of different soil types and basic yield of paddy was analyzed by different soil type nutrients and blank areas without nitrogen application. The nitrogen requirement per 100 kg of base yield and soil nitrogen Seasonal utilization. The results showed that the contents of soil organic matter, total nitrogen, available nitrogen and available potassium in paddy soils and paddy soils in paddy soils were significantly higher than those in four soilless paddy soils. The content of total nitrogen, organic matter and alkali-hydrolyzable nitrogen in different farmland soils of the same soil species were relatively stable, and the spatial variability was relatively small. The soil organic matter content of the eight soil soils had a significant correlation with the basic yield of rice. Soil organic matter content of the 8 soil soils all played a key role in the basic yield of rice in blank area without nitrogen application, which was significantly greater than that of total nitrogen, available nitrogen, available phosphorus and available potassium. According to the experimental results, the basic yield model of paddy with no soil nitrogen blank was established, and the simulated values were in good agreement with the measured values. The average nitrogen requirement per 100 kg of paddy soil (1.78 kg, 1.75-1.81 kg), while that of four paddy-paddy soils was 2.09 kg (2.04-2.14 kg). The utilization rate of soil nitrogen in four soil types of desorption paddy soil averaged 36.4% (35.0% -37.2%). The utilization rate of soil nitrogen in the four soil types of paddy paddy soil averaged 41.6% (38.9% -43.3%).