ニカメイガ幼虫の成育に及ぼす水稲施肥の影響

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タイトル別名
  • Effect of Fertilizers on the Growth of Larvae of the Rice Stem Borer, <i>Chilo suppressalis</i> WALKER
  • ニカメイガ ヨウチュウ ノ セイイク ニ オヨボス スイトウ セヒ ノ エイキョウ 4
  • IV. Growth Responses of Larvae to the Rice Plant supplied with Potassium Fertilizer at Different Levels
  • IV. カリウム施用量の多少と幼虫の成育

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In a series of papers concerning the effect of fertilizers applied to the rice plant on the growth of the rice stem borer larvae, the authors have demonstrated that good growth of larvae can be attained by feeding rice plant cultured on soils or in solutions rich in nitrogen, while phosphorus fertilizers usually had no significant effect.<br>The present experiments were undertaken to know whether or not the growth of larvae is affected by application of potassium fertilizers to the rice plant. Three experimental series were provided for rearing the larvae, as follows:<br>Series 1: Larvae were reared on living rice plants grown in a greenhouse on soil supplied with potassium fertilizer, at high, low, or zero level.<br>Series 2: Larvae were reared on living rice plants cultured in a greenhouse in nutrient solution containing potassium at high or low level.<br>Series 3: Larvae were reared on steam-sterilized rice plant stems, in flask, at 28°C, under an aseptic condition; the plants used having been grown in nutrient solution in the same manner as in the series 2.<br>As is shown in the following table, there was found, within each series, practically no difference in the growth of larvae.<br>Contents of several constituents in the plant, including potassium, were virtually equal among the plants grown on soils supplied with potassium fertilizer at different levels. In the plants cultured in solutions, chemical compositions of the plant did not differ significantly with the concentration of potassium in the nutrient solutions, except for the potassium content. The plants reared in potassium rich solutions contained a higher amount of potassium in comparison with the plants grown in potassium deficient solutions. These results indicate that level of potassium fertilizer did not affect remarkably the chemical composition of the rice plant and that the growth of larvae is not affected by the potassium content itself of the host plant.<br>It is suggested that application of potassium fertilizer to a paddy field also may not affect the growth of the rice stem borer larvae, under natural conditions.

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