Study On Effect Of Potassium On Quality And The Main Correlative Mechanism Of Cucumber In Solar-greenhouse

The effect of potassium fertilization on primary nutrition quality, flavour quality, fruit hardness and crisp, nitrate content and their main correlative mechanism of cucumber in solar-greenhouse were studied with Jinyou N0.1. The relativity of volatile flavour and non-volatile flavour compounds, the main nutrition components and flavor quality were compared and analysed. 5 treatments were designed in the examination, which were 0,20,40,60,80kg/667m² K₂O applied. The same amount N 42.9kg/667m² and P2O5 25.0kg/667m² were applied in each treatments. The result were as follows. 1. The dry matter of cucumber fruits were about 4%～5%, and it increased as the potassium fertilizer increased. Proper potassium fertilizer was applied, the Vc, soluble sugar and soluble protein content of cucumber friuts were all increased remarkably. However, when the amount of potassium fertilizer(K₂O)were more than 40～60kg/667m², the above nutriments presented degressive current. 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(K₂O)were used. The more potassium fertilizer were used, the less the nitrate content. 2. The hardness of peel and flesh and crisp of cucumber friut most increased gradually as the amount of K₂O increased. There's significance to...