调控稻田人工生物圈及其新耕作体系研究——Ⅰ.稻田长期定位试验结果初报

Studies on Artificial Controlling Biosphere in Paddy Field and New Cropping System I . The Preliminary Report on Long-term Determination of Soil Fertility in Paddy Field

经连续5年稻田定位测定结果表明,在综合技术作用下,稻田人工生物圈内放养各种鱼,产量可达3700kg/ha左右。同时少施了约70％的化肥,水稻产量仍比常规种稻略有增产。而且土壤中的有机质、全氮、全磷含量逐年累积,并高于常规种稻;在土壤速效养分的供应上也表现为肥力充足、平稳。试验证实了能获得高产、低耗、低污染的可能性。

Continuous 5-year determination showed that,under the comprehensive reaction of various practices, the fish yield in artificial controlling biosphere maintained 3. 7t/ha, and its rice grain yield has also slightly increased to compare with traditional farming system in the condition which decreased 70% chemical fertilizer. The results of long-term determination demonstrated that, O. M, total N and total P in artificial controlling biosphere accumulated year by year, and higher than that in traditional farming plots. Furthermore, the soil fertility in pits and ditches is higher than field surface layer in the same plot. The supply of quick-acting nutrition from the soil of artificial biosphere plots characters high fertility and stability. It thus proved practically the posibility to realize sustainable agriculture with high yield, low consumption and pollution.