| With the restructuring of agriculture and the developmenting agricultural technology, greenhouse tomato developed rapidly in china. But because of market economy does not perfect, that negative impact, Appeared the phenomenon which farmers are too much fertilizer, and fertilized uniformly applied unreasonable, to pursue productivity and income. On the one hand, increases the cost of production, on the other hand, Easy to cause physical barriers vegetables, cause of soil secondary salinization, nitrate and nitrite offend, soil degradation, and reduce tomato output and quality. It can be seen from this that, The fertilizer to the scientific management has become an facilities in the question of greenhouse tomato.With "311-B" optimummixed design, study on the different proportion of nitrogen, phosphate and potassium on greenhouse tomatoes growing and production. In the test conditions, the different proportion of nitrogen, phosphate and potassium have a significant influence to plant height, stem, dry matter and yield of tomato. In three elements of the nutritional, nitrogen exerted the most influence over tomato. under a range of nitrogen, phosphate and potassium is related to plant high, but the interaction of nitrogen and phosphate, nitrogen and potassium is negatively related to plant high. nitrogen, phosphate and potassium is related to stem, and the interaction of nitrogen and phosphate, nitrogen and potassium is related to stem. in certain amount of potassium, appropriate to apply for an increase in the fertiliser nitrogen and phosphate, contribute to increase the stem. The interaction of phosphate and nitrogen, phosphate and potassium obvious effect on dry matter, show that, phosphate not only affected the dry matter, but also interact to nitrogen and potassium. Phosphate can promote plants to absorb nitrogen and potassium, and to improve the fertilizer utilization rate. Nitrogen, phosphate and potassium have a positive effect on tomatoe yield, and conform the law of diminishing returns, Too much fertilizer can significant reduce output. The suitable application of nitrogen, phosphate and potassium when the plant high and stem of tomato to the maximum value is more than the suitable application when the yield to the maximum value. It show that, Within certain limits for the excess fertilizer can promote growth with nutrition and reduce the production of tomato. Too much nitrogen can increase the amount of accumulated nitrate in tomato. And appropriately increaseing phosphate can reduce the amount of accumulated nitrate. Increasing phosphate can increase the suger content, and increasing potassium can improve the leve of the suger content soluble sugar, vC and amino acid. So appropriate nitrogen,phosphate and potassium can improve the nutritional quality of tomato. |
