【摘要】 本文就长期施用硫酸盐肥料对土壤性质和水稻生育的影响进行了系统研究,实践证明,硫酸盐肥料能促使土壤有机质缓慢积累,能提高土壤中磷的有效性,能活化粘土矿物晶格中所固结的钾素,改善土壤钾素供应状况。土壤中速效氮、磷、钾动态变化的趋势是一致的,在早稻生育期间(5月底6月初)速效氮、磷、钾有一个高峰期。一般说,铵态氮的高峰期比较早,速效磷、钾的高峰期比铵态氮略迟。在晚稻生育期间,这些养分的动态交化与早稻生育期间不同,有效磷保持相对稳定,有效钾直线下降。其原因及其对水稻生育的影响有待进一步研究。 长期施用硫酸盐肥料,对稻米蛋白质含量和氨基酸组成也有影响,优化施肥能提高稻米蛋白质含量。含硫氨基酸如蛋氨酸,胱氨酸的含量,早稻比晚稻高;碱性氨基酸的含量,晚稻比早稻高。更多还原

【Abstract】 It was found that a long-term application of sulfate fertilizer gave marked influence on the characters of the paddy soils and rice growth. It could retard organic matter accumulation in the soil, increase the amount of available phosphorous, liberate potassium from clay mineral lattice. The content of exchangeable potassium and available sulfur increase obviously, the soil total N. P. K. has no change, the proportion of N:P:K=1:0.5:5.7.The grain output and hiomass of rice through a long-term application of sulfate fertilizer appear to depend on planting season and the weather. No harm to rice growth and no significant influence of sulfur on the crude protien have been found by applying sulfate for more than 10 years.Amino acid contents in early rice were different from that in late rice. The acidic amino acid contents and some neutro amino acid contents tended to increase in early brown rice when sulfate fertilizers were supplied for a long time.更多还原