植物营养与肥料学报2012，Vol.18Issue(3)：654-661,8.
滴灌施氮对高垄覆膜马铃薯产量、氮素吸收及土壤硝态氮累积的影响
Effects of nitrogen fertilization on potato tuber yield, N uptake and soil NO3--N accumulation under plastic mulching with drip irrigation
摘要
Abstract
A field experiment was carried out to investigate the effects of different nitrogen levels（ N 0,90,180,270 and 360 kg/ha）on potato tuber yield, soil nitrate accumulation, nitrogen balance and nitrogen use efficiency in potato under plastic mulching with drip irrigation. The results show that the tuber yield of the N180 treatment is the highest, and the highest soil NO3-N contents are observed at 0-20 cm soil layers of each treatment at the harvest stage of potato, and the soil NO3- -N contents are reduced with the increase of depth in soil profiles （0-120 cm）. Soil NO3--N accumulation of each treatment（0-40 cm ） accounts for 47.75%-53.17% of total accumulation （0- 120 cm）. Soil NO3--N accumulation and nitrogen apparent loss are positively correlated with the nitrogen application rates. Potato nitrogen uptakes, soil NO3--N accumulation and nitrogen apparent loss accounts for 37.93%, 45.99% and 16.08% of the total nitrogen input. Nitrogen absorption of potato tubers and nitrogen harvest index are increased with the increase of the nitrogen application rate. The highest N recover efficiency, N agronomic efficiency and N physioloyieal efficiency are observed in the treatment of N90, about 67.97 % , 68.06 kg/kg and 154.92 kg/kg, respectively. The nitrogen application rates should be controlled by 90-180 kg/ha under plastic cover with drip irrigation in potato production areas of northern Yinshan mountains in Inner Mongolia.关键词
马铃薯/施氮量/硝态氮积累/氮素平衡/氮素利用率Key words
potato/nitrogen rate/nitrate accumulation/nitrogen balance/nitrogen use efficiency分类
农业科技引用本文复制引用
井涛,樊明寿,周登博,秦永林,石晓华..滴灌施氮对高垄覆膜马铃薯产量、氮素吸收及土壤硝态氮累积的影响[J].植物营养与肥料学报,2012,18(3):654-661,8.基金项目
国家自然科学基金 （）
农业部公益性行业计划 （）
内蒙古农业大学马铃薯创新团队（nndpy-5）支持研究项目资助. （）
