【摘要】 研究不同氮肥施用量对马铃薯生长、产量和养分吸收的影响,为氮肥的合理施用提供依据。氮肥(N)用量设置6个水平:0、90、135、180、225kg/hm~2和270kg/hm~2,连续2年进行田间定位试验。结果表明,马铃薯植株氮素和钾素的积累量随施氮量的增加而增加;施加氮肥可显著促进马铃薯生长。在当地条件下,氮肥的最优施用量为180kg/hm~2。在此施氮量下,马铃薯产量和干物质含量均高于低氮处理;但是,当施氮量超过180kg/hm~2时,产量和干物质含量又呈降低的趋势。更多还原

【Abstract】 The purpose of this study was to investigate the effects of different nitrogen fertilizer dosages on potato growth,yield and nutrient absorption,and provided a basis for the rational application of nitrogen fertilizer.Six levels of nitrogen fertilizer(N)were used:0,90,135,180,225 and 270 kg/hm~2.Through two consecutive years of experiments in the same fields,the results showed that the accumulation of nitrogen and potassium in potato plants increases with the increase of nitrogen application,and nitrogen fertilizer can significantly promote potato growth.The test results also showed that under local conditions,the optimal application rate of nitrogen fertilizer appears to be 180 kg/hm~2.Under this nitrogen application rate,potato yield and dry matter content were higher than those with lower nitrogen dosages;however,when the nitrogen application rate exceeded 180 kg/hm~2,the yield and dry matter content showed a downward trend.更多还原