In order to understand the factors affecting silicon absorption and distribution in maize,the organ silicon of 2 maize varieties‘ Zhengdan 958 ' and‘ Zhongdi 175 ' and its corresponding soil available silicon were measured at 4 grown stage under zero to three times irrigation in rain-proof.Soil available silicon is stable among profiles,the average is 118.2 mg SiO2/kg.Organ silicon is affected by duration and organs surface area expose to air.For 0 to 2 irrigation schedules,total silicon increase with irrigation,but declined under 3 irrigation slightly.‘Zhengdan 958'absorbs more silicon than‘Zhongdi 175'.The silicon content and distribution were closely related with water transportation and distribution which can be a indicator of evapotranspiration cumulant.%为了解影响玉米硅吸收和分配的要素,本试验测定了玉米品种‘郑单958’和‘中地175’播后灌井水0～3次、4个生育期、7种器官在水分可控条件下的全硅含量及土壤剖面有效硅含量.结果表明:土壤有效硅均值为118.2 mgSiO2/kg,土层间和生长季内基本稳定;硅含量与器官发育时间长和暴露面积有关;在0～2次灌水下,玉米硅含量随灌水次数增多而提高,3水处理有所下降;‘郑单958’硅含量均明显高于‘中地175’.玉米器官硅含量与水分吸收和器官间分配有关,可作为蒸腾累计量的指标.
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