nutrient balance

Nutrient balance of agricultural soil in fixed monitoring sites in two main agricultural regions of Huang huai hai Plain was studied, and evaluated by nutrient permissible surplus and deficit rate.

本文研究了黄淮海平原二个主要农业自然经济类型区定位监测点的农田土壤养分收支平衡状况，并用养分允许平衡盈亏率进行评价。

In order to fertilize the soil fertility, the model of nutrient balance demands that the surplus of N should be over 40% so as to achieve a good nutrient cycle in the oases agro-ecosystem.

为了培肥地力，模式养分平衡要求N盈余在40%以上，以实现绿洲农业生态系统养分良性循环。

The nutrient balance of N P K in aquent of Hebei alluvial plain and their evaluation

河北低平原潮土氮磷钾平衡状况及评价研究

At the same time, balance of nitrogen, phosphorus, potassium and silicon accumulation was beneficial for dry matter accumulation, which linearly increased with increase of nutrient balance index and decreased with increase of nutrient deviation index.

同时，N、P、K、Si积累的平衡有利于干物质积累，干物质积累量随NBI（养分平衡指数）直线增加，随NDI（养分偏离指数）直线下降。

nutrient balance and mechanism of biological degradation of oil

石油烃微生物降解的营养平衡及降解机理

Eliminate free radical, improve immunity, optimize internal secretion, resist lipofuscin and keep nutrient balance.

清除自由基 、 增强免疫力 、 调节内分泌 、 抑制脂褐素、保持营养平衡.

Nutrient Balance and Soil Fertility Change in Different Conservation Measures on Sloping Field

坡耕地不同水土保持措施下的养分平衡和土壤肥力变化