Effects Of Pearlite Particle Size And Irrigation Patterns On Growth And Development Of Enclosed Cultivated Tomato

In order to improve the yield and quality of tomatoes cultivated in closed tank,the closed tank cultivation system developed by the vegetable center was used in this experiment to select the appropriate perlite particle size ratio and irrigation model for closed tank tomato cultivation.The physical and chemical properties of perlite grain size ratio and its effects on the growth,quality and yield of tomato plant were studied.The effects of different amounts and frequencies of nutrient solution on plant growth,photosynthetic rate,leaf microstructure,yield and quality of tomato cultivated in closed tank were studied and analyzed by using suitable matrix particle size ratio.The research results of this paper are as follows:(1)The growth and physiological indexes of the three sizes >4mm,2-4mm and <2mm perlite compound tomato had significant effects.Before colonization,aeration porosity and pore size ratio of perlite grain size ratio increased with the increase of grain size content.After transplanting,the water-holding pores of each treated matrix showed an increasing trend,while the aeration pores and the pore ratio of size and size showed a decreasing trend.The pH value changes stably before and after transplanting,the EC value increases in the appropriate range,and the physicochemical properties can satisfy the plant growth.The plant height,number of leaves and root activity of T3 and T4 treated with the perlite grain size ratio of 3:4:3and 3:6:1 were higher than those treated with T1,T2,T7 and CK with more grain size.The soluble sugar content of T3 and T6 was significantly higher than that of T1,T2,T7 and CK.The yield per plant,water use efficiency and dry fresh weight of the whole plant treated with T3 were the best,which were significantly higher than CK.The experiment shows that the appropriate perlite particle size ratio is >4mm,2-4mm,<2mm T3 treatment of 3:4:3,can be used as the tomato cultivation substrate under this system.(2)With the increase of irrigation,the growth,biomass,water content and yield of tomato increased.With the decrease of irrigation amount,the soluble sugar content,soluble protein content,vitamin C content and sugar-acid ratio of tomato gradually increased.The irrigation frequency had no significant effect on the growth and development of tomato under the same irrigation amount.The treatment of A2 and A3 with irrigation amounts of 2L and 3L increased plant height,stem diameter and yield.The titratable acid and vitamin C contents of A1 and A2 were higher than A3.A1B3 treatment had the highest water use efficiency and the lowest water consumption per plant.The entropy weight method and TOPSIS method were combined to obtain the best A1B3 treatment result based on various indexes,that is,the optimal irrigation quantity of each tomato plant was 1L and the irrigation frequency was 3 times per day,which could be used as the irrigation mode for the application of this system.