Growth target and fertilization standard of fermented chicken droppings on a paddy rice variety 'Haenuki' under organic cultivation
2006
Misawa, H.(Yamagata-ken. General Agricultural Research Center (Japan)) | Oba, S. | Uzuki, T. | Ueno, M.
We define the growth target and the fertilization standard of fermented chicken droppings on a paddy rice variety "Haenuki" under organic cultivation. 1) Planting density for cultural disease control. It is possible to control leaf blast that the maximum number of stems is less than 500 stems/m(2) on "Haenuki" planted on around May 20. The number of stems is about 75% compared with that under conventional cultivation and makes the humidity between hills low. When the planting density is less than 17.5 hills/m(2), and 5 seedlings/hill, the maximum number of stems is less than 500 stems/m(2). 2) Basal application of fermented chicken droppings. On this planting density in paddy field composted cow dung and chaff mature 200kg/a for many years, the application of amount 1.3-1.6kgN/a for basal application is the least to reach the maximum number of stems 500 stems/m(2) in the years when the stems develop well. The amount makes the amount of nitrogen absorbed in rice plant and the density of nitrogen in rice plant less than those under conventional cultivation. In addition, it makes the number of stems less and the leaf color lighter (under about 40 on SPAD) than those under conventional cultivation. We think that those make the infection and the expansion of blast disease difficult.
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