定西市全膜双垄沟播马铃薯连作养分补给研究

Nutrient Supply to Potato Under Plastic-covered Ridge and Furrow Planting in Continuous Cropping System in Dingxi City

通过对不同连作年份全膜双垄沟播马铃薯产量与土壤养分变化分析,开展了养分补给研究试验。结果表明,为缓解产量下降幅度,第2年连作时,施肥量应为N 225.0 kg/hm^2,P_2O_5 187.5 kg/hm^2,K_2O 150.0 kg/hm^2,较对照(N 180 kg/hm^2,P_2O_5 150 kg/hm^2,K_2O 120 kg/hm^2)商品薯率提高5.9个百分点,产量提高14.9%;第3年连作时,施肥量应为N 270.0 kg/hm^2,P_2O_5 225.0 kg/hm^2,K_2O 180.0 kg/hm2,较对照商品薯率提高13.8个百分点,产量提高28.0%。

An experiment on nutrient supply to potato under plastic-covered ridge and furrow planting in continuous cropping system was conducted by analyzing tuber yield and soil nutrients. In order to alleviate yield loss in the second year, fertilizer should be applied at the rate of N 225.0 kg/ha, P_2O_5187.5 kg/ha and K_2O 150.0 kg/ha. At this application rate, tuber yield was increased by14.9% and marketable tuber percentage by 5.9 percentage points compared with the control（N 180 kg/ha, P_2O_5150 kg/ha and K_2O 120 kg/ha）. In the third year, the application rate should be at N 270.0 kg/ha, P_2O_5225.0 kg/ha and K2 O 180.0 kg/ha, and the yield was increased by 28.0% and marketable tuber percentage by 13.8 percentage points over that of the control.