The studies reported herein were conducted to inquire the effect of fused siliceous materials which mixed with sand and quartz added calcium fertilzer on rice grown on low available silica content soil. The applied nitrogen level were examined for the two plots, nitrogen 10㎏ and 20㎏ per 10a., and the siliceous materials(Wollastonite, Fused sand and Fused quartz) were applied as levels to 100㎏, 300㎏ and 500㎏ per 10a. in the pots.
The results are summarized as follows;
1. The available silica content solved in N/2 HCl solution of fused sand was more than of Fused quartz but the silica solubility in 2% citric acid of fused quartz were higher than other.
2. The absorbed silica content by plant grown on the fused quartz plot was the highest among other siliceous materials and of fused sand and natural wollastonite were at almost equal. The ratio of absorbed silica of natural wollastonite was highest among them and in fused materials, the quartz was higher than sand.
3. The productivity of rice was increased by percentage of filled grain, weights of 1000 grains, and number of spikelets on account of the large quantity of the silica absorbed by plant Especially fused quartz showed the highest productive effect among siliceous materials and natural wollastonite and fused sand were similar effect.
4. From the above results, the fused quartz was selected as expected siliceous fertilizer on rice plant among them and the fused sand was equal effect to natural wollastonite.
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