钾对不同品种大白菜生长、品质及钾积累的影响

为在有限钾素资源条件下充分利用大白菜(Brassica campestris L. ssp. pekinensis)遗传性状获得高产和高质，对不同品种大白菜（‘德丰1号’、‘德高8号’、‘丰抗70’、‘大江78’、‘巨龙83-24’和‘义和秋’）幼苗在低钾和高钾2种钾水平下生长及品质的差异进行比较研究。结果表明，低钾条件下‘德丰1号’的生物量和钾积累量都是最高；除‘德丰1号’外，高钾处理的大白菜生物量明显高于低钾处理；与低钾处理相比较，高钾处理明显提高大白菜的钾积累量，但不同品种变化程度不一，‘德丰1号’变化幅度最低。施钾提高所有大白菜品种的可溶性蛋白和VC含量，降低硝酸盐含量。表明施钾促进大白菜幼苗生长，提高营养品质，‘德丰1号’对低钾环境的适应性最强。

Effects of Potassium on the Growth, Quality and Potassium Accumulation of Different Brassica campestris L. ssp. pekinensis Varieties

In order to obtain the high yield and quality of Brassica campestgs L. ssp. pekinensis under limited potassium resources using its hereditary feature, different varieties （‘Defeng 1＇, ‘Degao 8＇, ‘Fengkang 70＇,‘Dajiang 78＇, ‘Julong 83-24＇ and ‘Yiheqiu＇） were studied in performances of growth and quality with two potassium levels （low potassium and high potassium）. The results showed that, under the low potassium, the biomass and potassium accumulation of‘Defeng 1＇ were the highest. The biomass of Brassica campestris L. ssp. pekinensis treated by high potassium was higher significantly than that in low potassium except ‘Defeng 1＇.Compared with the low potassium, potassium treatment increased the potassium accumulation, but the degree varied by variety, the changes of ‘ Defeng 1 ＇ was the lowest. Potassium application increased the soluble protein and V C contents, decreased nitrate content in all the Brassica campestris L. ssp. pekinensis cuhivars. These results indicated that potassium could promote Brassiea eampestns L. ssp. pekinensis seedlings growth and enhanee the nutritive quality, ‘Defeng 1＇ had the strongest adaptability to low-potassium stress among the sixBrassiea campesris L. ssp. pekinensis varieties.