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Abstract
Soil physico-chemical properties are an important phenomenon for sustainable crop production and maintenance of optimum soil health. Hence, a laboratory measurement was conducted with soil samples of three years long experimental field of the Department of Soil Science, Bangladesh Agricultural University, Mymensingh to assess the changes in five selected soil physico-chemical properties viz. soil texture, bulk density, soil pH, total nitrogen and organic matter. The experiment was laid out in a split plot design with two water regimes (continuous flooding and alternate wetting & drying) in the main plots and five fertilizer treatments (N0 - control, N1- 140 kg N/ha as PU, N2- 104 kg N/ha as USG (2× 1.8 g/ 4 hills), N3 - 5 t CD + PU @ 140 kg N /ha on IPNS basis and N4- 5 t CD + USG (2× 1.8 g/ 4 hills @ 104 kg N/ha)) in the subplots under rice-rice cropping pattern with three replications. After three years, soil samples were collected at 0-5 and 5-10 cm soil depths for measuring bulk density and at 0-10 cm depth for other soil properties and analyzed. Results found that % sand, % silt, % clay, bulk density and soil pH was not changed significantly compared to initial status. Percentage of total nitrogen and organic matter was significantly affected by irrigation and fertilization. Total nitrogen (%) was higher in AWD whereas organic matter (%) was higher in CF practice. The highest total nitrogen (%) and organic matter (%) was found in N4 treatment in which USG was applied in combination with cowdung as organic manure. It can be suggested that N4 treatment was formed good combination for sustaining chemical properties of soil. Further long- term experimentation will be needed to know the changes in soil properties for sustainable crop production and improving soil health.
 Asian Australas. J. Biosci. Biotechnol. 2020, 5 (2), 65-71
Highlights
In Bangladesh, the soil resources have been used intensively without proper care, as a result organic matter content and soil fertility is being depleted
Materials and Methods This experiment was conducted in the Soil Science field laboratory, Bangladesh Agricultural University (BAU), Mymensingh, under rice-rice cropping pattern to find out the changes in soil properties under different fertilization and water regimes
Soil pH remained unchanged while soil total N and organic matter content was changed significantly under different fertilizer and water treatments
Summary
In Bangladesh, the soil resources have been used intensively without proper care, as a result organic matter content and soil fertility is being depleted. Changes in soil fertility and the resultant crop productivity are matters of nutrient “imbalance,” which has been recognized as one of the most important factors that limit crop yields (Singh et al, 1999). Now-a-days, farmers of the country trying to increase the crop yield by applying more and more inorganic fertilizers. Farmers most frequently use nitrogenous fertilizer (i.e., urea) as a source of nitrogen (N) which is considered as the most limiting nutrient for rice production because of its diversified pathways.
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