种植密度和施肥对马铃薯养分吸收及土壤肥力的影响

Effects of Planting Density and Fertilization on Nutrients Uptake of Potato and Soil Properties

在普施２２５ｔ·ｈｍ－２农家肥和固定Ｎ：Ｐ２Ｏ５：Ｋ２Ｏ比例２：１：３的条件下，研究了不同种植密度和施肥量对马铃薯品种“川芋早”矿质养分吸收利用和土壤肥力的影响。结果表明：加大种植密度和提高施肥水平均使植株群体的每生产千公斤薯块的Ｎ，Ｐ２Ｏ５，Ｋ２Ｏ的吸收量增加，提高肥料的利用率，尤其是高密高肥和高密中肥处理显著。农家肥的施用可以增加土壤中有机质和速效养分的含量。

On the basis of the proportion of N,P 2O 5 and K 2O 2:1:3 all treatments were supplied with 22 5t\5hm -2 FYM The effects of four nates of fertilizer application and three planting densities on the nutrients uptake of potato (CV. Chuanyuzao), and the change of soil properties were studied.. The results showed that the rises in both fertilizer application and planting density led to more uptake amounts of N,P 2O 5 and K 2O per 1000kg tuber yield. The utilization coefficient of fertilizer was high when fertilizer and planting density were high. Chemical fertilizer application combined with FYM increased significantly the contents of organic matter and available N, P 2O 5,and K 2O.