施氮量对百喜草产草量、叶片含氮量及含水量的影响

Effects of Different Nitrogen Application Rates on The Yield, Leaf Total Nitrogen and Water Content of Paspalum notatum Flügge

研究施氮量与百喜草(PaspalumnotatumFlügge)产量、叶片含氮量和含水量间的关系。结果表明:施氮450kg/hm2百 喜草增产最高,增产342.16%,施氮量90kg/hm2处理的每千克氮增产量最高(79.9kg);随着施氮量的增加,叶片含氮量上 升迅速,当施氮高于360kg/hm2,叶片含氮量趋于平缓,出现饱和现象;施氮450kg/hm2,叶片含水量最高(69.5%);百喜草 产草量、叶片含氮量和叶片含水量与施氮量间呈极显著相关。

A study of the dynamic change of nitrogen application on the yield, leaf total nitrogen and water content of Paspalum notatum Flügge and their quantitative relations shows that the maximum percentage of increasable yield of P. notatum Flügge reaches 342.16% with nitrogen application of 450 kg/hm^2. Nitrogen fertilizer of 90 kg/hm^2 is an optimal application to the yield which reaches 79.9 kg for each kilogram of nitrogen employed. Though the leaf total nitrogen content increases correspondingly with increased nitrogen application up to 360 kg/hm^2,the increase is not apparent when the application tops 360 kg/hm^2, and then the leaf total nitrogen content saturates. When nitrogen application reaches 450 kg/hm^2, the leaf water content rises to the highest point of 69.5%. Nitrogen application rates affect the P. notatum Flügge yield, leaf total nitrogen and water content significantly.