水稲による施用ケイ酸の吸収と窒素施用量の関係

概要

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To investigate the relationship between the recovery rate of applied silica of calcium silicate fertilizer (CS) by rice plant and application rates of nitrogen (N), a pot plant experiment was conducted under ditfer- ent CS and N application rates. Treatments were CS application as basal fertilizer (Si+)and no silica appli- cation (Si-) and the both treatments were grown with three nitrogen (N) application levels, i.e., low (Nl), middle (Nm), a nd high (Nh). Higher nitrogen application rates improved the plant dry weight significantly, re- gardless of Si-or Si+ treatment. In comparison with Nl values, the total dry weight in Si- and Si+ plants increased by 31 and 35% in Nh and 19 and 21% in Nm treatments. The ditference of silica content between Si+ plants and Si-plants was significant, but there was no significant ditference in silica content among ni- trogen treatments. The recovery rates of applied silica by rice plants in Nl, Nm, and Nh were 23.9, 32.4 and 30.6%, respectively, but there were no significant ditferences in recovery rates of silica among the ditferent nitrogen application rates Therefore, it seemed that the recovery rate of applied silica of CS was not atfected by nitrogen application rate and plant growth. Key words:　calcium silicate, silica uptake, N application, recovery rate, rice
山形大学の論文
2009-02-16