Establishment of agronomical root promotion in princemelon [Cucumis melo] culture in the Ogasawara islands [Japan]
1990
Ozawa, K. (Tokyo-to. Ogasawara Subtropical Agricultural Experiment Center, Chichijima (Japan))
Because deeper development of root systems promoted the hot season production, agronomical measures which developed roots deeply were investigated in the present paper, 1) Yields and root developments, which were surveyed in six fields of farmers in Hahajima-island, related in nearly direct proportion each other. The estimated factors to limit the developing roots were due to heavy training of vines, heavy irrigation, heavy application of fertilizer and hard plowed pan. 2) In the field experiment, training of vines minimized root development and fruit brix value. Thus heavy vine training as similar as done in the main land have to be avoided in the Ogasawara islands. 3) Breaking of plowed pan promoted deeper root development and increased marketable yield. 4) Heavy application of fertilizer minimized root development, however heavy trench application avoided the damage
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