Effects Of Different Nutrient Formula On Nutrient Accumulation In Tomato And Root-zone Solution Of Coir Culture Tomato

Long season matrix cultivated tomatoes,late fertility is prone to the accumulation of salt in the root area,causing the imbalance of ion ratio.It causes the adverse effects of shortening the tomato cultivation cycle,the absorption barrier of plant nutrients,the decrease of tomato yield and the decrease of fruit quality.In view of the above problems,the application effect of different K-Ca-Mg supply and Cl^-partial replacement NO₃^-on tomato nutrient absorption and the mitigation of salt accumulation in the root area was studied from the point of view of the adjustment of the formulation of nutrients with organic matrix coconut bran as the carrier.The results of the study show that:（1）Nutritional solution K-Ca-Mg supply control.The EC values of the solution in the 3 treatment root areas were higher than CK and were greater than 6 m S·cm^-1 in the late harvest.In the late stage of recovery,the concentration of 3 treatment nutrients K⁺,Ca²⁺,Mg²⁺all a cumulative,the pull period,the root solution nutrient accumulation caused the ion ratio imbalance.Increasing the supply of Mg to reduce K can increase the accumulation of dry matter and Ca,Mg nutrients,tomato production increased by 8.16%,reducing the vitamin C content of fruit.（2）Nutritional solution Cl^-replace part NO₃^-has no effect on the p H value of the tomato root area,the EC value rises in the late harvest period,and the salt stress in the crop root area,slowed the root region solution K⁺,Ca²⁺,Mg²⁺concentration increase rate,so that Cl^-concentration increased.Nutritional liquid Cl^-replace part NO₃^-can improve the yield of K,Mg nutrients in the harvest period of fruit,the fruit sitting period and harvest will improve the nutrient content of plant N,Cl.The nutrient solution Cl^-replaces part NO₃^-to reduce the amount of vitamin C in the fruit,increased the accumulation of dry matter during harvesting period.The increase of the yield of tomato harvest in the pre-harvest period will reduce the yield in the late harvest,but it has no effect on the overall output.Conclusion:Increasing the supply of Mg to reduce K can increase the accumulation of dry matter and Ca,Mg nutrients,and improve tomato yield.K-Ca-Mg supply control cannot alleviate the problem of salt accumulation and ion ratio imbalance in the late root area.Nutrition Liquid Cl^-Replace part NO₃^-is conducive to the reduction of N fertilizer supply,improve the accumulation of nutrients of fruit K,Mg,increase the accumulation of dry matter during harvesting,but will reduce the vitamin C content of fruit.