Effect of Water-fertilizer Supply on Tomato Lycopene Content under Alternate Subarea Root-zone Irrigation

This study is to find out the effects of irrigation amount and fertilizer applying quantity of nitrogen,phosphorus and potassium on tomato(Lycopersicon esculentum Mill.)lycopene content under alternate subarea root-zone irrigation.Regression model on water and fertilizer factors and tomato lycopene content was established with quadratic orthogonal regressive rotation design with 4 factors by pot experiment.The results showed that if other factors were zero codes,lycopene content in tomato decreased linearly with the increase of irrigation amount,while increased with the increase of nitrogen and phosphorus fertilizers applying quantity,but it would not change along with the change of potassium fertilizer applying quantity.The interaction between irrigation amount and potassium,nitrogen and phosphorus fertilizer applying quantity presented negative effect on the accumulation of tomato lycopene content.Under the condition of alternate subarea root-zone irrigation,over irrigation was not favorable for the increase of lycopene content in tomato.Rational increase of nitrogen,phosphorus fertilizers applying quantity could effectively increase lycopene content in tomato.