Nitrogen application rate for fall-winter harvest Japanese radish [Raphanus sativus] based on soil nitrate before fertilizer application
2006
Yamamoto, F.(Chiba-ken. Agriculture Research Center (Japan)) | Kusakawa, T. | Matsumaru, T.
Japanese radish was cultivated by fall seeding for fall-winter harvest in Andosol to study nitrogen application rate based on soil nitrate before fertilizer application. Seeds were sown at three different timings. 1. When the seeding was early in September, the total sum of soil nitrate before fertilizer application and nitrogen application combined required to obtain a root weight of 1,000 grams, which is classified as large size, was 3 kg/10a or more by mulching culture and 6 kg/10a or more by non-mulching culture, respectively. 2. When the seeding was in the middle of September, the total sum was 6 kg/10a or more regardless of mulching. 3. When the seeding was late in September, mulching culture was essential and the total sum was 9-12 kg/10a. 4. In the mulching culture in a farmer s field seeded late in September, yield decreased whether the total sum was less than the recommended rate of fertilizer (12 kg/10a) or significantly more than that. The results provided an actual proof that the proper level of the total sum was 9-12 kg/10a.
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