In order to clarify the effects of silicon fertilizer on the growth of tomato plants cultivated in substrates,this study used Jingfan 501 tomato as the experimental material to study the effects of root application of different concentra-tions of silicon fertilizer on tomato growth,physiological and biochemical characteristics,substrate enzyme activity and physical and chemical properties.The results showed that compared with no exogenous silicon control(CK),root applica-tion of 1 mmol/L silicon fertilizer could significantly increase the plant height,stem diameter and leaf area of tomato plants,significantly increase the contents of chlorophyll a,chlorophyll b and total chlorophyll,inhibit the accumulation of superox-ide anion(O2·-),malondialdehyde and proline in tomato leaves,and significantly increase the activities of peroxidase and catalase.At the same time,the activities of sucrase and phosphatase in the substrate treated with 1 mmol/L silicon fertilizer were significantly higher than those in CK.Combined with principal component analysis,root application of 1 mmol/L sili-con fertilizer could effectively promote tomato growth and development by increasing photosynthetic pigment content,antioxidant enzyme activity and soil enzyme activity,re-ducing tomato membrane lipid peroxidation,and improving the physical and chemical properties of the substrate.The results of this study can provide a scientific basis for the efficient management of tomatoes cultivated in substrates.
Solanum lycopersicum L.silicon fer-tilizerphysiology and biochemistrysubstrate physico-chemical properties
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