Potassium Requirements for Maximum Yield and Quality of Processing Tomato (California)
نویسنده
چکیده
tomato production, growing nearly 40 percent of world supply. The majority of fruit is processed into concentrated paste, but an increasing percentage is being used for products utilizing peeled fruit, either whole or diced. Important fruit quality attributes for paste production are soluble solids content (SS) and color of the blended product. Uniformity of color is more important for peeled fruit. Even a small area of poorly colored tissue is problematic. Uneven ripening of processing tomato fruit is a common problem in California. The typical external symptom, called yellow shoulder (YS), is a ring of tissue around the stem scar that upon ripening remains yellow. Internal white tissue (IWT), which can occur throughout the fruit, is often severe enough to render affected fruit unsuitable for use in peeled, diced products. The occurrence of these disorders has been frequent, but unpredictable. Potassium nutrition has often been linked to tomato fruit yield and quality, but its relative influence on tomato fruit yield and quality under typical California field conditions is less clear. Exchangeable soil K is generally high, commonly greater than 150 parts per million (ppm), a level which numerous field trials have shown to be adequate to achieve maximum yield. Factors other than K fertility (primarily irrigation management) predominately control fruit soluble solids. To systematically determine the influence
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