阴山南麓旱作马铃薯的施肥指标

为使内蒙古阴山南麓旱作马铃薯施肥趋于合理,2006~2008年在该地区进行了多点马铃薯"3414"田间试验,分析了不同基础肥力下土壤有效养分含量与马铃薯相对产量的相关性,并依此确定了土壤养分等级和施肥数量。内蒙古阴山南麓旱作马铃薯土壤全氮等级划分为极低(<0.64 g.kg-)1、低(0.64～0.92 g.kg-)1、中(0.93～1.58 g.kg-)1、高(1.59～1.90 g.kg-)1和极高(>1.90 g.kg-)1,对应推荐施氮量每667 m2分别为>9.3、9.3～7.6、7.5～5.0、4.9～4.1、<4.1 kg;速效磷含量划分为极低(<4.9 mg.kg-)1、低(4.9～8.4 mg.kg-)1、中(8.5～19.0 mg.kg-)1、高(19.1～25.0 mg.kg-1)和极高(>25.0 mg.kg-)1,对应推荐施磷量每667 m2分别为>5.1、5.1～4.1、4.0～2.6、2.5～2.1、<2.1 kg;速效钾含量分为极低(<61 mg.kg-)1、低(61～88 mg.kg-)1、中(89～151 mg.kg-)1、高(152～182 mg.kg-1)和极高(>182 mg.kg-)1,对应的推荐施钾量每667 m2分别为>5.0、5.0～4.3、4.2～3.3、3.2～3.0、<3.0 kg。

Establishment of Soil Nutrient Indexes for Rainfed Potato in the South Yinshan Area of Inner Mongolia

In order to make proper fertilization recommendation to rainfed potato production in the South Yinshan areas,Inner Mongolia,96 rainfed potato "3414" fertilization experiments were conducted in 5 counties of the South Yinshan area from 2006 to 2008.The correlation between the soil nutrient concentration and the corresponding relative yield of potato tubers in different fertility levels was analyzed,soil nutrient abundance indexes of the South Yinshan area was established,and recommendation rates were also calculated from the fertilizer effect functions.The total soil N was classified as 5 degrees of very low(< 0.64g.kg-1),low(0.64-0.92 g.kg-1),medium(0.93-1.58 g.kg-1),high(1.59-1.90 g.kg-1) and very high(>1.90 g.kg-1),and the corresponding N fertilizer recommendation rates were as > 9.3,9.3-7.6,7.5-5.0,4.9-4.1,< 4.1 kg N based on 667 m2 of land,respectively.Five Olsen P grades were as very low(< 4.9 mg.kg-1),low(4.9-8.4 mg.kg-1),medium(8.5-19.0 mg.kg-1),high(19.1-25.0 mg.kg-1) and very high(> 25.0 mg.kg-1),and the corresponding P fertilizer recommendation rates were as > 5.1,5.1-4.1,4.0-2.6,2.5-2.1,< 2.1 kg P2O5 based on 667 m2ofland,respectively.Five soluble Kgrades were as very low(< 61 mg.kg-1),low(61-88 mg.kg-1),medium(89-151 mg.kg-1),high(152-182 mg.kg-1) and very high(>182 mg.kg-1),and corresponding K fertilizer recommendation rates was as following: > 5.0,5.0-4.3,4.2-3.3,3.2-3.0,< 3.0 kg K2O based on 667 m2 ofland.