Soil Organic Matter affected by abiotic factors and inorganic fertilization under Boro rice cultivation
Soil organic matter (SOM) plays an important role in determining crop productivity as it binds with the nutrients and prevents leaching. The effect of dry direct seeded Boro rice plant with and without the different amount of same inorganic fertilizer- Urea: diammonium phosphate: muriate of potash on the SOM content with time and soil depth in loamy soil was investigated in this study. Five plots were randomly selected in a series with one control and four treatment combinations at Banaras Hindu University (BHU) Agriculture Farm, Varanasi during the 2018 Rabi season. The soil samples were collected at the following root depths; (5,10,15,30, 45, and 60) cm on 0, 34, 86, 156 days after sowing (DAS), and SOM was measured. The interactions between fertilizer and SOM content were found significant. The average depth-wise analysis showed maximum SOM at 30-45cm followed by 0-5cm with urea and without urea treatment shows the consistencies with soil texture depth wise analysis. The SOM content average was found highest on 34 DAS and 86 DAS in with and without fertilized plots. The study highlights the influence of urea treatment on SOM content at different depths over time along with driving meteorological variables responsible for the change in SOM.