在高产栽培中磷肥不同施用量对水稻生长效应和养分吸收的影响

Effects of Different Application Amounts of Phosphate Fertilizer on Paddy Growth and Nutrient Uptake in High-Yield Cultivation

在研究水稻高产的规范栽培技术中．对高产田进行磷肥不同施用量的试验研究。结果表明：高产田施磷，水稻的分蘖以及前、中期的生长量、中期体内养分浓度和养分累积量均随施磷量增加而显著增加。施磷量过高或较低．水稻后期生物量也较低；水稻成穗率、结实率、千粒重以及养分运转率都因施磷量过高而下降，稻谷产量亦相对有所降低．对于土壤速效养分，不但速效磷随施磷量增加而升高，土壤速效钾亦如此，而土壤按态氮则受施磷量的影响不显著。

A study on different application amounts of phosphate fertilizer in high productive field was carried out while we researched on the standard Cultivation practices for high-yield paddy in recent years. In high productive field, paddy tillering and biomass production increase significantly at the early and middle stages with the increase in application amounts of phosphate fertilizer, the nutrient contents and accumulation in paddy plants at the middle stage also show the similar trends. If the application amounts are too high or too low, the biomass production decreases at the late stage. The earbearing tiller rate, seed setting rate, 1000-grain weight, the nutrient transformation rate and rice yield decrease while the application amount increases. As to the concentrations of the readily available nutrients in soil, P and K increase as the application amount rises. However, there is no significant effect on the concentration of NH_4￣+ -N.