内蒙古灌溉马铃薯施肥现状及肥料利用效率

内蒙古马铃薯的生产面积及总产量均居全国前列，但单产低于全国平均水平，养分管理不合理是限制马铃薯产量的 重要因素。2013～2016 年在内蒙古9 个马铃薯主产旗（县）对灌溉马铃薯养分投入情况进行调查。结果表明：内蒙古灌溉 马铃薯生产中，氮肥投入过高，磷、钾肥投入过量与不足并存；58% 的农户氮肥偏生产力低于100 kg · kg^-1，具有较大的提 升空间。农户种植规模、产量、氮肥施用量与氮肥偏生产力存在显著相关关系。

Situation of Fertilization and Fertilizer Use Efficiency on Irrigated Potato in Inner Mongolia

Potato production area and total yield in Inner Mongolia ranks front in China，but its per unit area yield is below the average national level．Unreasonable nutrients management is an important factor restricting potato yield．In order to find out the problems existing in irrigated potato nutrient inputs，this paper conducted peasant household investigation in 9 main potato producing counties during 2013-2016 in Inner Mongolia．The results indicated that the input of nitrogen fertilizer was exorbitant，and over-input or shortage of phosphorus and potassium fertilizer were coexistent．Nitrogen partial factor productivity of 57.3% peasant households was lower than 100 kg · kg^-1 for irrigated potato production in Inner Mongolia，having bigger room for improvement．There existed remarkable correlativity between planting scale of peasant households，yield level of potato，nitrogen fertilizer application amount，and nitrogen partial factor productivity．