喷施氯化钾对油菜氮、磷及籽粒产量的影响

Effects of Sraying KCl Solution on Total Nitrate,Photosynthate and Grain Yield of Oilseed Rape(Brassica napus L.)

在油菜盛花期对其茎叶喷施w=1%的KCl溶液,w=1.17%的K2SO4溶液和清水,以探索油菜优质高产栽培新途径。结果表明,与喷施清水相比,喷施w=1%KCl溶液能使油菜角果初期叶片硝酸还原酶活性增强26.9%,植株全氮和全磷量角果初期分别增加6.6%和3.3%,收获期分别增加9.1%和6.7%,氮效率和磷效率分别增加10.0%和1.5%,氮和磷收获指数分别增加21.0%和17.1%,籽粒产量平均增加10.2%。喷施K2SO4溶液与喷施清水差异不显著,与喷施KCl溶液差异显著。

The study was conducted to seek a way for obtaining high yield of oilseed rape and to promote the use of nitrogen and phosphorus.In this article,1%（mass fraction） KCl solution was sprayed to the stems and leaves at the fully blooming stage of the crop with spraying 1.17%（mass fraction）K2SO4 solution and clear water for the control.Plant samples were taken at initial siliquing and harvesting stages,soil culture used in this experiment.Results showed that,the average of NRA was increased by 26.9% under the KCl solution treatment compared with clear water treatment,as well as the average content of total N and total P of plant increased by 6.6% and 3.3% respectively in initial siliquing stage,and 9.1% and 6.7% respectively in harvesting stage.The average of grain yield,nitrogen use efficiency（NUE）,phosphorus use efficiency（PUE）,N harvesting index（NHI） and phosphorus harvesting index（PHI） were increased by 10.2%,10.0%,1.5%,21.0% and 17.1% respectively under KCl solution application compared with spraying water.There was no significant difference between spraying K2SO4 solution and spraying water,but significant difference between K2SO4 solution treatment and KCl solution treatment.