黑龙江省农田养分循环与平衡状况的初步探讨

Preliminary Study on Nutrient's Cycle and Balance in Farmland Soil of Heilongjiang Province

本文对黑龙江省 1977～ 1997年农田生态系统中氮、磷、钾三要素输入输出及其平衡状况、土壤养分变化状况进行了研究 ;分析了农田养分循环与平衡的变化趋势 。

This article shows us some results about nitrogen, phosphorus and potassium in agricultural ecosystem, for instance, input, output, balance and the change of the Soil nutrients in Heilongjiang province from 1977 to 1997.