Study on A Mathematical Model for the Relationship Between Amounts of N,P,K Application and Tomato Yield in Eco-organic Soilless Culture

Taking Solanum lycopersicum ‘Jinpeng No.1' as material,by the saturating D-optimal design in ternary quadratic regression,the influence of cooperation application of N,P,K in the organic and soilless culture on the yield of Solanum lycopersicumin different stages were studied,and the equation model between the application amount of N,P,K and the yield of Solanuml ycopersicum were also established.The results showed that the influence of N,P,K nutrient on the yield of Solanum lycopersicumin the early,middle and late stage were obvious.In the early stage,the optimum application amount of N was 0.72g,P2O5 0.35g,and K2O 1.00g each plant every time,and the highest yield was up to 16.49kg each square.In the middle stage,the optimum application amount of N was 0.78g,P2O5 0.29g,and K2O 1.30g each plant every time,and the highest yield was up to 22.06kg each square.In the late stage,the optimum application amount of N was 0.74g,P2O5 0.30g,and K2O 1.11g each plant every time,and the highest yield was up to 18.01kg each square.