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提高营养液中的钾素含量,能够促进番茄株高、茎粗、叶面积的生长,并且有利于植株干物质的积累,座果率和产量也明显提高。但过多的钾肥对株高、叶面积及产量有抑制作用。钾肥对番茄生长及产量的效应与氮素的水平有关,适宜水平的氮对钾肥提高座果率和促进生长有积极作用,但不同水平的氮对钾肥提高产量的作用无影响。氮钾肥配施十分重要,高氮低钾配合不利于植株的生长,并且使番茄的座果率和产量下降。在本试验条件下,综合考虑植株生长和产量指标,以N2K3(N:250mg·L-1,K:630.6mg·L-1)为最佳处理。
Increasing the content of potassium in nutrient solution can promote the growth of tomato plant height, stem diameter and leaf area, as well as the accumulation of plant dry matter. The fruit yield and yield have also been significantly improved. However, too much potash fertilizer can inhibit plant height, leaf area and yield. The effect of potash on the growth and yield of tomato was related to the level of nitrogen. Appropriate levels of nitrogen had a positive effect on the increase of fruit set rate and growth by potash fertilizer. However, different levels of nitrogen had no effect on the yield increase of potash. Nitrogen and potassium fertilizers are very important, high nitrogen and low potassium is not conducive to the growth of plants, and the fruit yield and yield of tomatoes decreased. Under the conditions of this experiment, taking N2K3 (N: 250mg · L-1, K: 630.6mg · L-1) as the best treatment considering the plant growth and yield indicators.