陇中半干旱区旱地马铃薯平衡施肥效应研究

Effect of Balanced Fertilization on Potato Growth in Semi-arid Area of Gansu Province

在陇中半干旱区旱地进行了马铃薯平衡施肥试验,结果表明:马铃薯最高产量达24 216.7kg/hm2,是当地平均产量的1.2倍,高磷处理比无磷处理增产马铃薯7510.8 kg/hm2,增幅44.96%,1kg P2O5增产马铃薯25kg,纯收益增加3 262元/hm2,施磷效益极显著。试验认为,OPT中钾量合适,磷量偏低,氮量可能偏高,最佳的施肥量为N200 kg/hm2、P2O5300 kg/hm2、K2O 150 kg/hm2,3种肥料的养分配比为N∶P2O5∶K2O=100∶150∶75。

An experiment in the banlanced fertilization in semiarid area of central Gansu was conducted. The best yield was 24 216.7 kg/hm^2 that was 1.2 times of local production level. Compared with the yield in non-P treatment, the treatment with 1/2 more P resulted in the of 7510.8 kg/hm^2（inereased by 44.96% ）. The yield was increased in 25 kg/1 kg P2O5 application. The net income was increased to 3 262 yuan/hm^2. So the effect of phosphorus fertilizer was very. prominent. The field experiment showed that in OPT, the amount of K2O was appropriate;P2O5, the lower and the N, little higher, The best suitabale rate of N： P2O5 ：K2O was 100：150：75（200 kg/hm^2 N,300 kg/hm^2 P2o5 and 150 kg/hm^2 K2O）