TY - BOOK AU - Akhila Ashokan AU - Mini, V (Guide) TI - Humic acid as a biostimulant and chelating agent for improving rice productivity in the Onattukara sandy soils U1 - 636.0896 PY - 2025/// CY - Vellayani PB - Department of Soil Science and Agricultural Chemistry, College of Agriculture KW - Agricultural Chemistry KW - Economic KW - Rice N1 - PhD ER -