氮钾营养对大青菜产量、品质和生理指标的影响

在盆栽试验条件下，研究了氮肥不同用量和氮，钾配施对大青菜产量，品质和生理指标的影响，结果表明，在每千克风干土施氮0－0.32g范围内，随着氮肥用量增加，大青菜的产量，硝态氮和叶片的叶绿素含量均明显增加，而水溶性糖含量明显降低，游离氨基酸含量和叶片有效光合速率则呈先增加后降低的趋势，每千年风干土施氮0.16g时达到最高值，在本试验条件下，每千克土施氮0.24和0.32g时配施钾肥，对提高大青菜的产量，降低其体内的硝态氮含量和改善其营养品质方面均具有一定效果。

Effect of Nitrogen and Potassium on the Yield, Quality and Physiology Indices of Garden Sass

Pot experiment was conducted to study the effects of nitrogen and potassium on the yield, quality and physiology indices of garden sass. The results indicated that the yield, nitrate content of plant and chlorophyll concentration of leaf were increased with increase of nitrogen application rate at the range of 0-0.32 g/kg, but the soluble sugar content was significantly decreased at the same time. The available photosynthesis rate of leaf and free amino acid content of plant were gradually increased at the range of application rate of 0-0.16 g/kg and then gradually decreased at the range of application rate of 0.16-0.32 g/kg. Under the experiment condition and with nitrogen application rate of 0.24-0.32 g/kg , applying potassium has specified roles on increasing yield, improving quality as well as decreasing nitrate content.