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Original Articles

Calibration and Categorization of Plant Available Silicon in Rice Soils of South India

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Pages 1237-1254 | Received 07 Sep 2007, Accepted 16 Feb 2009, Published online: 13 Jul 2009
 

ABSTRACT

Calibration of field crop responses to nutrient availability acts as a basis for making fertilizer recommendations from soil and tissue analysis. The purpose of this study was to evaluate and summarize silicon (Si) fertilization of rice in different soils of south India. The experiment consists of four levels of calcium silicate as Si with three replications. Initially, soils were analyzed using eleven different extractants. The grain and straw yield were recorded and analyzed for Si content. The critical levels for plant available Si in the soil ranged from 14 mg kg−1 (distilled water-1) to 207 mg kg−1 [0.005 M sulfuric acid (H2SO4)]. There was a wide variation in low, medium, and high categories of plant available Si for different extractants calculated based on percent relative yield. The critical level of Si in straw and grain were 2.9 and 1.2%, respectively.

ACKNOWLEDGMENTS

The authors wish to express their appreciation to Excell Minerals, Sarver, PA, USA for providing calcium silicate and DBT, Government of India for funding support for completing this research work.

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