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采用大田试验,研究了高海拔地区钾素营养对马铃薯品质的影响及增产效应。结果表明,适量的钾肥施用量既可以增加马铃薯单株结薯块数及大中薯块的比例,减少小薯块的数量,同时还能提高马铃薯的淀粉、维生素和蛋白质含量。随着钾肥施用量的增加,马铃薯块茎产量、大薯率、净增产值、产投比均呈现先上升后下降的趋势,钾肥(K2O)施用量在180 kg/hm2时虽能获得较好的块茎产量和大薯率,但不能获得较高的经济效益,综合产量和经济效益分析,最佳的钾肥(K2O)施用量135 kg/hm2左右为宜。
Field experiments were conducted to study the effects of potassium nutrition in high altitude on potato quality and yield increase. The results showed that the appropriate amount of potash fertilizer could increase the number of potato tubers per plant and the proportion of large and medium potatoes, reduce the number of potatoes, and also increase the starch, vitamins and protein contents of potatoes. With the increase of potassium application rate, tuber yield, potato yield, net production value and production / input ratio of potato showed the trend of first increasing and then decreasing. Although K2O application rate of 180 kg / hm2 could get better Tuber yield and big potato rate, but could not obtain higher economic benefit. The optimum K2O application rate was about 135 kg / hm2 according to the comprehensive yield and economic benefit analysis.