广西农田养分循环与平衡分析

以广西合浦县（桂南）、贺州县（桂东北）、来宾县（桂中）、大化县（桂西北）和田阳县（桂西）共５县３０村１５０户及广西有关农业生产资料（１９９７年）分析广西农田养分分循环状况，结果表明：广西农田施肥年专缺氮肥２８０４１２．３ｔ，钾肥５０７８５６．６ｔ；盈余磷肥２４１０９８．２３ｔ。水田盈余氮肥５１９５４．３ｔ，磷肥１３９５９０．２５ｔ，亏缺钾肥４３７２．４ｔ；盈余磷肥２４１０９８．２３ｔ。水田盈余氮肥

Nutrient Circulation and Balance of Farm Land in Guangxi

The status of nutrient circulation in the farm land of Guangxi was analysed in terms of the agricultural infromation from 150 households of 30 towns of 5 counties across Guangxi which are Hepu (south ),Hezhou (northeast), Laibin (middle), Dahua (northwest) and Tianyang (west) . The results are as follows. There are 280 400 tons of nitrogen fertilizer and 507 900 tons of potassium fertilizer deficient each year in the farm land, with 311 300 tons of phosphorus fertilizer surplus. For paddy fields, there are 51 900 tons of nitrogen fertilizer and 139 600 tons of phosphorus fertilizer surplus each year, with lacking of 4 400 tons of potassium fertilizer. The surplus nitrogen is giving rise to the pollution of waters. For dry land, there are 36 100 tons of phospharus fertilizer surplus each year, but lacking 321 400 tons of nitrogen fertrilizer and 503 500 tons of potassium fertilizer. Potassium is responsible to keep the equilibrium of nutrient in paddy fields. The dry land needs to invest more nitrogen and potassium fertilizers in order to increase outputs of crops effectively. In the current situattion, 280 400 tons of nitrogen and 507 800 tons of potassium fertilizers are required to maintain the nutrient circulation in Guangxi region.