Effectiveness of silica application at the panicle formation stage on the rice production

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  • 水稲におけるケイ酸資材の幼穂形成期施用の有効性
  • スイトウ ニ オケル ケイサン シザイ ノ ヨウスイ ケイセイキシヨウ ノ ユウコウセイ

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Abstract

The effects of silica application on the yield and quality of rice were compared among the following plots: (A) a new silicate fertilizer A was applied at the panicle formation stage at 12g m^<-2>, (B) a new silicate fertilizer B was applied at the panicle formation stage at 12g m^<-2>, (C) a conventional silicate fertilizer was applied before transplanting as a basal fertilizer at 36g m^<-2>, and (N) no silicate fertilizer was applied. The results obtained were as follows: 1. The relative yields at the experimental plots A, B, C and N were 106, 104, 104, and 100, respectively. The effectiveness of applied silicate ((yield at A, B, or C-yield at N)/the amount of Si applied) for A, B, and C were 2.58, 2.17 and 0.67g m^<-2>, respectably. In addition, higher cost performances were achievd in A and B than in C. 2. The numbers of grains were as follows: 30,400 grains m^<-2> for C>30,100 for A and B>28,900 for N. On the other hand, no significant difference was found in the 1,000-grain weight and the percentage of ripened grains among those experimental plots. 3. The amounts of Si in the leaves plus stems were as follow: 65.0 for A and B(110)>63.0g m^<-2> for C(107)>59.3 for N(100) The amount of Si in the grains were as follows: 35.3g m^<-2> for C(116)>33.2 for A and B(109)>30.4 for N(100) This fact indicates that the top-dressed Si was more effectively used by the rice plant than the basal Si. 4. Total amount of N acquisition and the recovery rate of top-dressed N by the rice plants were higher in Si-applied plots than in non-Si-applied plot. It is likely that the application of Si enhances the N acquisition, resulting in increase of the number of grains.

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