保肥性和供肥性是土壤的一个极为重要的性能。作物生长的好坏,同土壤的保肥性和供肥性有密切关系。我国劳动人民在生产实践中,很早就注意到这种性能,并总结了“先肥土,后肥苗”等宝贵的经验。特别是大寨大队把原来的“三跑田”改造成“三保田”,创造出保肥、供肥性能良好的“海绵田”,为我们认识和掌握土壤这一特性,培肥改土,夺取农业持续高产,树立了榜样。一、土壤的保肥性。土壤保肥性是指土壤吸收和保蓄作物生长发育必需养分的能力,是由土壤的物理、 Fertility and fertility are an extremely important property of the soil. Crop growth is good or bad, with the soil fertility and for fertilizer are closely related. The working people in our country have noticed such performance very early in their production practice and summed up their valuable experiences such as “fertilizing the soil first and then fertilizer after the fertilizer”. In particular, the Dazhai Brigade transformed the original “Sanbaotian” into “Sanbaotian” to create a “sponge field” for preserving fertilizer and providing fertilizers with a good performance. It has also recognized and mastered this characteristic of soil, cultivated soil and improved fertility, Capture the continued high yield of agriculture, set an example. First, soil fertility. Soil fertility conservation refers to the ability of the soil to absorb and conserve the necessary nutrients for the growth and development of the crop by the physical,