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在贵州威宁县连续开展一系列的平衡施肥试验示范研究 ,研究结果认为 :最佳N、P2 O5 、K2 O施用以 10 4～ 150kghm- 2 ,60～ 90kghm- 2 ,150～ 2 10kghm- 2 或 10 0 :40～ 60 :14 0～ 150的配比合理 ,其肥料的产投比可达 7以上 ,钾肥在合理的配比情况下的产投比可达 10左右 ,钾肥的净收益可达 480 0元hm- 2 。试验证明平衡施肥可以使马铃薯的产量和收入比常产增加 1/ 3至 1/ 2 ,能提高商品品质 ,产生良好的社会经济效益
A series of pilot studies on balanced fertilization experiments were conducted continuously in Weining County, Guizhou Province. The results showed that the best N, P2 O5 and K2 O application rates were 10 4 ~ 150 kghm -2, 60 ~ 90 kghm -2, 150 ~ 2 10 kghm -2 or 10 0:40 ~ 60:14 0 ~ 150 ratio is reasonable, the fertilizer production and investment ratio up to 7 or more, potash fertilizer ratio in a reasonable ratio of up to about 10, the net income of potash up 480 0 yuan hm-2. Experiments show that balanced fertilization can increase the yield and income of potato by 1/3 to 1/2 than that of normal production, which can improve the quality of products and produce good social and economic benefits