摘要
在辽西碳酸盐褐土上进行的９年试验表明，平均每年每公顷施用相当或略低于作物收获产品中含磷量的化肥磷（Ｐ）１４．４ｋｇ，既可持续地保持较高的作物产量，又可保持耕层土壤的总磷库贮量几乎不变，甚至有微小增长，其增长部分主要是有机磷；施用磷肥结合８０％收获产品喂猪、猪粪回田，则既可保持作物丰产又可显著提高耕层土壤的有机磷含量；连续施氮肥而不施磷肥可使该贫磷土壤耕层总磷库贮备显著下降。与富磷土壤不同，９年中该土壤对作物的供磷主要来自耕层的非活性磷库，而来自土壤活性磷库（树脂法测定）则只占１２％。经估算，约９０％的作物吸收磷来自耕层土壤。
The results from a nine years'field experiment on a calsic cinnamon soil indicated that the annual input of P 14.4kg / ha which is a little lower than the phosphorus harvested each year, had not only keeped higher crop yields but also maintained the soil total phosphorus pool and with a little increase of soil organic phosphorus in cultivated layer. In the treatment with nutrinents in 80% of harvested products recycled every year through a feeding-composting cycle combined with phosphrous fertilizer applied, the crop yields and the soil organic phosphorus content both considerably increased after nine years. There was a significant decrease of soil total phosphorus from the plot receiving nitrogen but no phosphorus fertilizer, a large propotion of phosphorus provided to crops was from soil non-labile phosphorus pool, but only 12% of phosphorus from labile phosphorus pool when the soil is lack of phosphorus. Calculation indicated that about 90% of the P taken up by crops was from soil cultivated layer.
出处
《土壤学报》
CAS
CSCD
北大核心
1996年第4期373-379,共7页
Acta Pedologica Sinica
基金
国家自然科学基金
