Effects of not applying phosphate on yield and available phosphate in an andosol field containing excessive phosphate
2016
Baba, K. (Yamanashi Pref. Agritech. Cent. (Japan)) | Nagasaka, K. | Yamasaki, S. | Kato, T.
A three-year cultivation test of not applying phosphate to six consecutive crops was conducted in a field containing excessive available phosphate. The following results were obtained: (1) the quantity of available phosphate decreased exponentially when cultivation was practiced without phosphate application and available phosphate decreased faster when its initial concentration was higher; (2) the available phosphate concentration required for radish and potato was low, at approximately 20 mg per 100 g when no phosphate was applied, and slightly higher for early-harvest sweet corn, at approximately 30 mg per 100 g. The yield of onion decreased without phosphate application even when the initial concentration was 35 mg per 100 g, leading to the conclusion that higher initial concentrations of available phosphate were necessary for improved yield.
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