Effects Of Amendment Application On Tomato Growth And Soil Physicochemical Properties Under Brackish Water Drip Irrigation

How to use brackish water safely and effectively to supplement the shortage of freshwater resources is crucial.When performing brackish water irrigation,not only must we pay attention to the growth and yield of crops,but we must also ensure the safety of the soil environment.This study carried out community experiments to set up the effects of irrigation of brackish water with different salt concentrations on the growth and photosynthetic characteristics of tomato seedlings,and to explore the application of soil amendments on the growth physiology,fruit yield,and tomato plants under the conditions of irrigation of brackish water with different salt concentrations.Effects of nutritional quality and soil physical and chemical properties.The research results show that:（1）Compared with T₀treatment,under T₃,T₄,T₅treatment,increasing the salt concentration of irrigated brackish water can reduce the tomato seedling height 6.32%～13.14%,stem thickness 7.25%～11.83%,main root length 14.75%～21.08%,lateral root number 13.08%～16.38%,root surface area 6.87%～12.88%,root volume 8.27%～12.01%,root dry matter quality 17.69%～30.77%,aboveground dry matter quality 20.39%～43.62%,and increased Root to shoot ratio of tomato seedlings.Among them,the growth effects of T₂treatment and T₀treatment were significant and the difference in photosynthetic characteristics was not significant.（2）Compared with T₀treatment,increasing the salt concentration of irrigated brackish water significantly reduced tomato leaf area index,leaf dry matter quality,stem dry matter quality,root length density,leaf chlorophyll content and net photosynthetic rate,transpiration rate,stomata The daily average value of conductivity and water use efficiency,and the application of soil amendments can effectively alleviate the adverse effects of brackish water irrigation on tomato growth and photosynthesis.（3）Compared with T₀treatment,increasing the salinity salt concentration in irrigation（average（two crops））reduced the tomato yield per plant by 8.11%～65.36%,while the average（two crops）increased the deformed fruit rate by 17.31%～200.50%;and Compared with the application of no soil amendments,the application of soil amendments can increase the average yield of tomato plants by 7.70%～45.81%（two crops）,and reduce the malformation rate by12.41%～38.1%（two crops）.With the increase of salt concentration in the brackish water,the content of soluble total sugar and soluble solids in tomato fruits increased first and then decreased,while the content of vitamin C showed a decreasing trend,and the content of organic acids showed an increasing trend.Compared with no application of soil amendments,the application of soil amendments can increase the total soluble sugar content of tomato fruits by4.78%to 13.71%,soluble solids content by 1.00%to 6.45%,and vitamin C content by 4.58%to24.49%,while reducing organic The acid content is 2.10%～21.55%.（4）The soil moisture content,total salt content,p H value,Na⁺content and Ca²⁺content increase with increasing salt concentration of irrigated brackish water,while the soil organic matter content decreases accordingly.Compared with no application of soil amendments,the application of soil amendments can significantly reduce soil total salt content,Na⁺content and Ca²⁺content,increase soil moisture and organic matter content,adjust soil p H,and effectively improve soil physical and chemical properties.In summary,irrigation with brackish water will inhibit tomato growth and photosynthetic characteristics,reduce tomato yield and quality,increase malformation rate,reduce soil organic matter content,increase soil salinity,and cause soil salt accumulation.The application of soil amendments can effectively reduce the salinity of the soil,increase the organic content of the soil,adjust the p H of the soil,improve the physical and chemical properties of the soil,promote the conversion of the soil to a benign direction,and finally alleviate the growth of tomato with brackish water irrigation.Suppress,increase production and improve quality.