Production of tomato cultivars in hydroponics and fertigation with different ratios between nitrogen and potassium Protected tomato cultivation presents a high potassium demand for obtaining high fruit yield and quality, but the ratio between nitrogen and potassium supplies which provides such results has not been sufficiently evaluated. The fruit yield and quality of four tomato cultivars were evaluated in hydroponics and fertigation systems at two ratios between N and K provided to the plants. Two
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