Abstract
AbstractThis work targeted investigation of the efficiency of silica application on anatomical structures of the root system after 45 days from sowing and grain yield at maturity of the five rice varieties, Sakha104 (V1), Egyptian hybrid rice1 (EHR1) (V2), Sakha105 (V3), Giza178 (V4) and Giza179 (V5) under irrigation with drainage water (DW), having varied concentrations of Cd, Pb and Cr. Potassium silicate, potassium sulphate and silicon dioxide were sprayed individually as an aqueous solution at a concentration of 2% silica, applied twice 15 and 30 days after sowing. The collected results for the anatomical characteristics indicated that the highest values of cortex (650 length and 650 width μm), vascular bundle (750 length and 750 width μm), epidermis (241 μm) and xylem (175 length and 160 width μm) were recorded with application of Si as potassium silicate or silicon dioxide under the two types of irrigation water and in two consecutive growing seasons. Si application significantly increased shoots and root weight and length, and grain yield, compared to the Si‐untreated counterparts. The concentrations of Cd, Pb and Cr in harvested grains with application of potassium silicate or silicon dioxide under irrigation by DW were below the safety limits of 0.40, 0.20 and 1.00 ppm respectively.
Published Version
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