适于半干旱草场飞施NPZn复(混)配粒肥筛选及其增产效果的研究

THE SCREENING OF AIR APPLYING N-P-Zn GRANLAR FERTILIZER AND ITS EFFECT ON HAY YIELD IN SEMIARID PASTURE LAND

连续三年在吉林省白城地区前郭、大安两县草场上,通过NPZn三因素五水平最优回归设计试验,筛选出羊草高产、经济效益显著的NPZn合理用量及比例,然后在长山化肥厂加工成复合粒肥,用于大面积草场飞施作业。结果表明,以尿素、重过磷酸钙.硫酸锌单质混配的粉肥人工施入.适宜的养分用量N为6～8kg/亩,P_2O_5 6～9kg/亩,Zn 0.4kg/亩。其比例为1:1:0.06,可得干草223～295 kg/亩,每公斤粉配肥可增干草 8～13kg.用单质肥料加工造粒的NPZn三元复合肥.飞机作业,每亩施入20～25kg,每公斤复合粒肥增干草10.4kg以上。纯收益5～5.57元,大大提高了工效,是草原现代化施肥的可行措施.

The proper applying amount and rate of N-P-Zn fertilizer were selected through a 3-year regression design experiment with 3 factors and 5 levels in pasture land in Qianguo and Da'an counties. With compound fertilizers, the optimum proportion of urea, concentrated superphosphate and ZnSO4 was 1 : 1 :0.06. Then granular fertilizer with single substances of N-P-Zn was prepared proportionally for air-applying. Results showed that the complex granular fertilizer increased hay yield by more than 10.4kg per kg of fertilizer with an applying rate of 25kg/mu. Thus air-applying granular fertilizer is a practical way in modern pasture fertilizing.