摘要
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 )分析广西农田养分循环状况。结果表明 :广西农田施肥年亏缺氮肥 2 80 4 12 .3t,钾肥 50 7856 .6 t;盈余磷肥 2 4 10 98.2 3t。水田盈余氮肥 51954.3t,磷肥 139590 .2 5t,亏缺钾肥 4 372 .4 t,盈余的氮肥已对水体造成污染 ;旱地盈余磷肥 36 0 6 7.79t,亏缺氮肥 32 1372 .6 3t和钾肥 50 3484 .13t。水田增施钾肥才能维持水田养分平衡 ;旱地增施氮、钾肥才能有效促进作物 (如甘蔗 )增产、增收。在目前产量情况下 ,需增施 N2 80 4 12 .3t,K2 O50 7856 .6 t,才能实现广西农田养分平衡。
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.
出处
《广西科学院学报》
2000年第2期82-86,91,共6页
Journal of Guangxi Academy of Sciences
基金
自治区自然科学基金!(桂科字 991 2 0 1 4 )
人事厅的资助
关键词
农田
养分循环
营养平衡
广西
施肥
farm land,nutrient circulation, nutrition balance
