施肥對于稻熱病之發生及藥劑撒佈效果影響(第一報)稻苗試驗結果

Abstract

為明瞭稻作施用三要素方法對于稻苗稻熱病發生以及其藥劑防治效果而舉行此試驗： 茲將其主要結果列舉如後： (一) 當秧田施肥時，維持三要素之適當比率者，則可減輕稻苗稻熱病之發生，同時亦可增加稻熱病藥劑防治之效果。 (二) 對于稻熱病之發生，氮之影響最為顯著，即示正比例之傾向，而燐之影響不顯著，鉀則稍有抑制稱熱病發生之效果。 (三) 無論何種施肥情形下，稻熱病藥劑作為預防者，都較作為治療之效果為佳。 This expriment was carried out to obtain the relation between the application of fertilizers and the occurrence of rice blast or the effects of fungicidal control. Some essential results are summarized as follows: (1) The different level of three essential elements of fertilizers in suitable ratio could reduce the disease incidance and increase the fungicidal effects when they were applied to the rice nursery. (2) The occurrence of blast disease were most pronounced with a increase in nitrogen level. Phosphorus did not show prominent influence upon the disease development, whereas potassium tended slightly to increase the seedlings resistant to blast infection. (3) Under any different level of elements applied, the dusting with Ceresan-ljme for the protection is better than eradication purpose.