Substrate Composition And Water-fertilizer Quantitative Analysis Of Tomato Trans-Summer High Yield Cultivation In Plastic Greenhouse

Aiming for the crucial problems of causing the low yield, bad quality, low economic benefits, high residual pesticides and difficult to long-season cultivation, the paper using tomato analyzed and discussed the effects with different organic soil substrates composition, nutrients absorption properties and water-fertilizer coupling in trans-summer high yield cultivation in plastic greenhouse. Primarily study results as follows:1. The experiment was conducted using soil culture with corn straw, wheat straw, mushroom residue, sawdust and manure as substrates to select the better culture ingredient. The results showed that organic substrate could replace peat and vermiculite in physical structure. The tomato planted in the rational substrates grew finer, the relation between roots and leaves were better, yield and quality of tomato were also improved. The improvement of quality mainly behaved higher soluble solid matte and tomato red element. The formulas of 1hunman excrement and 3 saw dust, 1hunman excrement , 2 corn straw and 1 mushroom residue, Ihunman excrement, 1.5 peat and 1.5 vermiculite were the best favorite substrates among the treatments.2. The Experiment was analyzed the changes of physical and chemical characters of substrate compositions and nutrients properties of tomato. The results indicated that Formulas with more than 35% manure or 75% crop straw may inhibit plant growth and reduce the yield of tomato. Nutrition use efficiency and fruit nutrition absorption were the major factors on yield. The plant need to absorb N:3.70-10.46g, P2O5 0.93-2.30g, K2O 4.33-12.00g to produce 100kg tomato product.3. The experiment using tomato in greenhouse studied the different water-fertilizer combination in long season cultivation. The results showed that Irrigation was the major factor on yield. Higher irrigation behaved higher weight of every fruit and the number fruits of every truss. Higher amount irrigation could attain higher yield and dry matter, but water produce efficiency and dry matter productivity was lower than middling amount. With the same fertilizer application, the contents of chlorophy II contents of leaves and quality of tomato were diluted when giving more water. Considering yield , water using efficiency and produce cost, the feasible relative soil water content was 35 %,fertilizer combinations were CO(NH2)2+K2SO4,(NH4)2SO4, the better amount of additional fertilizer was 140kg/ 666.7 m2, nutrients absorbed of N:K2O=1:1.2.