| Effect of water and fertilizers on organic acid content of tomato under alternate partial root-zone irrigation |
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| DOI：10.7606/j.issn.1000-7601.2013.04.003 |
| Key Words: tomato organic acid irrigation amount nitrogen phosphorus potassium |
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| Abstract: |
| Quadratic orthogonal regressive rotation design with four factors was used to investigate the effects of irrigation amount and fertilizer rates of nitrogen, phosphorus and potassium on organic acid content in tomato by pot experiment under alternate partial root-zone irrigation, and the regression model on water and fertilizer and organic acid content in tomato was established. The results showed that, if other factors were at zero codes, the organic acid content in tomato decreased linearly with the increase of irrigation amount, while it increased linearly with the increase of nitrogen ertilizer rate. The relationship between organic acid content and phosphorus fertilizer rate or potassium fertilizer rate showed a changing trend as opening downward parabola. There were positive interaction effects between irrigation amount and potassium fertilizer rate, and between nitrogen fertilizer rate and phosphorus fertilizer rate. It was indicated that increasing the fertilizer rates of nitrogen and phosphorus could raise the organic acid content of tomato effectively; proper application of potassium fertilizer and proper reduction of irrigation water could also improve the accumulation of organic acid in tomato. |
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