钾营养对日光温室黄瓜品质的影响

EFFECT OF POTASSIUM FERTILIZATION ON QUALITY OF CUCUMBER IN SOLAR-GREENHOUSE

以津优1号黄瓜为试验材料,研究了硫酸钾施用水平对果实品质的影响。结果表明:各处理商品成熟黄瓜果实的干物质含量为4%～5%,干物质含量随着钾(K)肥用量的增加而增加。适量施用K肥,黄瓜果实中的Vc、可溶性糖和可溶性蛋白质等的含量较显著增加,但施肥量(K2O)超过40～60kg/667m2时,以上指标均有下降的趋势。在0～60kg/667m2范围内施用K肥,可显著降低单宁和有机酸的含量,但当用量超过60kg/667m2时降低效果减小。K肥用量越多,硝酸盐含量越低。表明适量施用K肥可显著提高黄瓜果实的营养水平和口感品质,同时对降低硝酸盐含量也有积极作用。

The effect of potassium fertilization on cucumber quality in solar-greenhouse was studied. Cultivar Jin You-1 was planted in soil with different potassium levels.The result showed that the dry matter of cucumber fruits were about 4%～5%, and it increased as the potassium fertilizer increased. When proper potassium fertilizer were used, the main nutriments of cucumber fruits, such as Vc, soluble sugar and soluble protein content were all increased remarkably. However, when the amount of potassium fertilizer(K 2O)were more than 40～60kg/667m2, the above nutriments presented decreasing trends. In the range of 0～60kg/667m2, The contents of tannin and organic acid reduced significantly as potassium fertilizer increased, but the effect was minished while more than 60kg/667m2 potassium fertilizer(K 2O)were used. The more potassium fertilizer were used, the less the nitrate content produced.These indicated that if proper potassium fertilizer were used, the nutritional level and the flavour or taste quality of cucumber fruits could be increased obviously. Potassium fertilizer played a positive role in the reduction of the nitrate content.