论文部分内容阅读
本研究在始于1960年的祁阳红壤长期定位试验地进行,供试土壤为第四纪红色粘土上发育的红壤.结果表明,土壤含磷量受地形部位、侵蚀程度、利用方式等影响;旱作土壤有机磷含量低,水旱轮作或绿肥双季稻田土壤有机磷含量高;有机磷与有效磷之间呈y=10.673+0.135x显著线性相关.无机磷组分受利用方式的影响更大,旱作及水旱轮作田土壤O—P分别占无机磷的51%和56%;Fe—P占32%和27%;AI—P和Ca—P均<10%.长期冬浸双季稻田土壤O—P占68～90%,Fe—P和AI—P仅占3～4%;长期施用石灰,Ca—P占无机磷的23%.未垦荒地磷的吸附率达90%以上,释放率25～34%;长期耕作的旱田磷的吸附率<82%,释放率达44～48%.施用磷肥可提高经济作物产量和品质.
The study was carried out in the Long-term Positioning Experiment of Red Soil in Qiyang County, which started in 1960. The soil tested was red soil developed on the Quaternary red clay.The results showed that the phosphorus content in the soil was affected by the topography, erosion degree and utilization pattern. Soil organic phosphorus content was low in paddy soils with high contents of soil organic phosphorus and high organic phosphorus content in paddy fields with double cropping or green manure. There was a significant linear correlation between organic phosphorus and available phosphorus y = 10.673 + 0.135x. , And the O-P of cropping in arid and arid-arid rotation fields accounted for 51% and 56% of inorganic phosphorus, Fe-P accounted for 32% and 27%, AI-P and Ca-P <10% O-P in the paddy soil accounts for 68-90%, while Fe-P and AI-P only make up 3 ~ 4%. Long-term application of lime, Ca-P accounts for 23% of the inorganic phosphorus. The adsorption rate of unphosphorylated wasteland reaches more than 90% , And the releasing rate was 25-34%. The uptake rate of phosphorus was <82% and the release rate was 44-48% in long-term cultivation of upland fields. The application of phosphate fertilizer could increase the yield and quality of cash crops.