水肥供应对番茄果实维生素C含量的影响

采用四元二次正交旋转组合设计,通过番茄盆栽试验,研究灌水量和氮、磷、钾肥用量对番茄维生素C含量的影响。结果表明,在试验条件下,番茄果实中维生素C含量随灌水量和施磷量呈开口向下的抛物线型变化,随钾肥用量呈开口向上的抛物线型变化,但不受氮肥用量的影响;交互效应表现为灌水量和施磷量以及施氮量和施钾量均呈负交互作用。表明合理的灌水量、施磷量和施钾量有利于提高番茄果实中的维生素C含量,而施氮量的改变是通过与施钾量发生负交互作用抑制番茄维生素C累积的。

Effects of water and fertilizer supply on vitamin C content in tomato fruit

Using a pot experiment and quadratic orthogonal regressive rotation design with four factors,the effects of irrigation amount and fertilizer rates of nitrogen,phosphorus and potassium on vitamin C content in tomato were investigated.A model of regression relationship between water and fertilizer mounts and vitamin C content in tomato was established.Single and coupling effects of all four experimental factors were studied.The results showed that for the soil and tomato variety used in the experiment,if other factors were zero codes,the relationship between vitamin C content and irrigation amount,P fertilizer rates could be estimated with a second degree parabola,which was open downward,while the second degree parabola between vitamin C content and K fertilizer rates was open upward,but vitamin C content was not affected by N fertilizer.The interaction between irrigation amount and P fertilizer rate,between N and K fertilizer rates showed a negative effect.It was indicated that supplying the fertilizers of P,K,or irrigation amount properly could raise the vitamin C content in tomato effectively.However,N fertilizer rate restrained significantly the accumulation of vitamin C in tomato by the negative interaction between N and K fertilizer rate.