高海拔地区马铃薯高产中的钾肥效应研究

在贵州高海拔地区织金县采用马铃薯高产栽培技术和平衡施肥技术 ,马铃薯产量为14 91t/hm2 ,超过当地平均产量 1 5倍 ,钾肥配施可增产马铃薯 1 0～ 2 5t/hm2 ,增幅 8 0 6 %～2 0 6 3% ,施钾产投比可达 2 0～ 3 5。施钾肥后马铃薯薯块重量增加 19 2 % ,增产以增加薯块为主 ,马铃薯品质有较大改善 ,试验认为 ,高产高效施肥的N∶K2 O比为 10 0∶95～ 14 0为宜 ,即施氮 (N)10 5kg/hm2 ,施钾 (K2 O) 10 0～ 15 0kg/hm2 为宜。施磷量应根据土壤中缺肥情况进行调整。

EFFECT OF POTASH APPLICATION ON POTATO YIELD

Due to rich light energy and radiation and large difference in temperatures between day and night in high altitude areas of Guizhou province,there is a large potential for increasing crop yield.This experiment was conducted in the areas about 1350 m above sea level with technologies of high yield practices and balanced fertilization.The potato yield obtained was 1 5 times of the local production level.Potash application has positive effect for increasing potato yield,ranging from 1 0 t/hm 2(8 06%) to 2 5 t/hm 2(20 63%).Return is 2 0～3 5 times.The weight of potato tuber increased by 19 2%.The increase in production lied on improved weight of potato tuber.Quality was also improved.The best ratio of N to K 2O was 100∶95～140.The amount of phosphate fertilizer should be based on soil's content of nutrients.