Suitability of extractant for soil available silicon and silicon response to upland paddy grown on alkaline soils of central India

Abstract

Several silicon (Si) extractants are being employed in different countries mostly for lowland acidic soils. Present investigation was conducted to evaluate suitable extractants for upland paddy grown on alkaline soils. Available Si was extracted by using ten different extractants. Tris buffer pH 7.0 (1:10) in Inceptisols showed positively highest and significant correlation with grain yield (r = 0.870), grain Si uptake (r = 0.887), straw yield (r = 0.852), and straw Si uptake (r = 0.919). However, 0.5 M acetic acid (1:2.5) in Vertisols showed positively highest and significant correlation with grain yield (r = 0.810), grain Si uptake (r = 0.852), straw yield (r = 0.850), and straw Si uptake (r = 0.929). The application of Si @ 200 kg ha⁻¹ along with chemical fertilizers significantly increased yield and nutrient uptake of upland paddy on Vertisols. Tris buffer pH 7.0 (1:10) and 0.5 M acetic acid (1:2.5) were suitable extractant for Inceptisols and Vertisols, respectively based on its correlation with yield and nutrient uptake.

Keywords:

• extractants
• inceptisols
• nutrient uptake
• silicon
• upland paddy
• vertisols