土壤供Si能力及Si与N、P的相互作用

辽宁地区水田土壤有效Si含量和土壤pH值及粘粒含量呈正相关,和DTPA-Fe含量呈负相关.根据土壤有效Si含量及其有关因素判断土壤供Si能力强弱,发现供Si能力强的土壤主要分布在辽南稻作区及部分中部和辽北稻作区,供Si能力弱的土壤主要分布在东部山地稻作区和辽东稻作区.试验证明Si和N、Si和P之间有相互促进肥效的关系,在N、P、Si适当配比下稻谷产量最高,N、P、Si都影响谷草比,在三者相互作用下,稻谷最高产量出现在谷草比1.0-1.1范围内.

Silicon supplying capacity of soil and interaction of silicon and nitrogen or phosphorus.

There is a positive correlation between available silicon content and pHvalue or clay content of paddy soil in Liaoning province. The silicon supplying capacity of soil in judged by available silicon content and related factors is different for various rice fields in Liaoning province. Soil with strong silicon supplying capacity mainly distributes in southern and partly in central or northern rice-planting belts, and that with weak silicon supplying capacity mainly distributes in rice-planting belts of eastern mountainous region and east Liaoning. Pot experiment with regression design shows that there is an obvious interaction of Si and Nor Si and P. With proper combination of N, Pand Si fertilizers, a maximum rice yield is obtained. N, Pand Si can all affect the ratio of rice/straw, and under the interaction of these three elements, the maximum rice yield will occur within the rice/straw ratio of 1.0-1.1.