【摘要】 试验结果表明:土壤原有速效磷高的淮农所淤土,随着磷肥用量增加,土壤速效磷含量迅速提高;新渡沙土原有速效磷含量低,施过磷酸钙150kg/亩时,只提高到8.6ppm(1985年10月)。土壤有效磷库的变化亦与土壤原有供磷水平有关。淮农所淤土有效磷库最高达171.7ppm(ColWell-P),而新渡沙土只有51.7ppm。除淮农所淤土外,其余4种土壤,小麦施磷肥增产14％～59％,并随磷肥用量的增加而提高。在稻麦轮作中,磷肥应重点施于小麦,水稻利用其残效。更多还原

【Abstract】 The results obtained during the first two years indicated that as the amount of phosphate fertilizers applied grew, the available phosphate level of the soils was increased. However, the experimental station soil increased its phosphate level much more than Xin Tu soil. Similarly, the change in soil available phosphate pool was also related to the phosphate status of the soil or the phosphate saturation of the soil.Excluding the experimental station soil which has high level of available phosphate there was significant increase in wheat yield by the application of phosphate fertilizer for other four soils and the more the fertilizer was applied, the more the yield increased. The yield increase ranged from 14%～80%.There was no yield response to the direct application of phosphate fertilizer on rice and soybean in the rotation with wheat which had been fertilized with phosphate.It is suggested that in the rice-wheat rotation more phosphate fertilizer should be applied on wheat and the rice crop to use the residual phosphate.更多还原