Impact Assessment of Cetyltrimethylammonium Bromide Treated Organically Modified Nanoclay-Polymer Composite on Soil Enzyme Activity and Root Volume
2019
Verma, Yukti | Datta, S. C. | Singh, Nitesh Kumar
The effect of organically modified nanoclay-polymer composite was evaluated on soil enzyme activity and root volume at different growth stages viz. crown root initiation, tillering and panicle initiation of wheat (variety: HD 3059). Nanoclay-polymer composite was synthesized by in -situ polymerization of acrylic acid-acrylamide in presence of cetyltrimethylammonium bromide @ 60% neutralization degree and 0.5% cross-linker level and subsequently loaded with di-ammonium phosphate fertilizer (14 g di-ammonium phosphate per unit weight of nanoclay-polymer composite). Phosphorus loaded nanoclay-polymer composite and conventional diammonium phosphate fertilizer were applied (P dose-40 mg P₂O₅ kg⁻¹ soil) to two types of soil (Alfisol and Inceptisol). Soil enzyme activity and root volume were studied independently with a factorial completely randomized design experiment. Results revealed that dehydrogenase enzyme activity in modified nanoclay-polymer composite increased by + 26.3 and + 19% over conventional fertilizer in Alfisol and Inceptisol respectively. Acid phosphatase activity (9.25 µg p-nitrophenol g⁻¹ soil h⁻¹) was highest at panicle initiation stage in Inceptisol whereas alkaline phosphatase activity was more at tillering in both soils. Root volume also increased by + 16.8% on applying nanoclay-polymer composite as compared to conventional fertilizer in Alfisol. The corresponding data in Inceptisol was + 13.1%. Therefore, it was concluded that nanoclay-polymer composite prepared from organoclay has a positive effect on soil enzyme activity as well as root volume.
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