Abstract
A field experiment was carried out at Sher-e-Bangla Agricultural University (SAU) Farm during July to November 2011 to evaluate the effect of integrated nutrient management (INM) on T. Aman rice (cv. BRRI dhan40). The field belongs to Red Brown Terrace soil under Tejgoan series having silt loam texture and 6.0 pH. Application of 70 % NPKS fertilizers + 4 t ha-1 dhaincha (Sesbania rostrata) (T1) produced the highest grain yield (5.90 t ha-1), the second highest yield (5.85 t ha-1) was obtained from 80% NPKS + 2 t ha-1 dhaincha (T2) treatment. The grain yield increased by 31.2 to 86.3% over control depending on the treatments. Treatments T1 and T2 resulted in higher N, P, K and S uptake by rice. The N, P, K and S concentrations of rice grain was higher for the treatments where Sesbania and cow dung were together applied in combination with NPKS fertilizers. The combined application of chemical fertilizers and organic manure increased organic carbon (OC), total N, available P, K and S contents in post-harvest soil. The overall results indicate that the integrated use of chemical fertilizer and organic manure can help increase grain yield of rice without deteriorating soil fertility.SAARC J. Agri., 15(1): 43-53 (2017)
Highlights
Agriculture in Bangladesh is predominately rice based and Bangladesh is the fourth rice (Oryza sativa) producing country in the world (BRRI, 2006)
Yield: The highest grain (5.9 t ha-1) and straw (8.59 t ha-1) yields were obtained from treatment T5 (70% NPKS + 4 t ha-1 DH) and T3 (80% NPKS + 4 t ha-1 cow dung (CD)), respectively and the lowest grain yield (3.63 t ha-1) and straw yields (4.66 t ha-1) were observed in control plots (Table 3)
The effect of T5 treatment was more pronounced in increasing the N content in rice grain and straw of BRRI dhan40 as compared to cow dung
Summary
Agriculture in Bangladesh is predominately rice based and Bangladesh is the fourth rice (Oryza sativa) producing country in the world (BRRI, 2006). Soil fertility deterioration is a major constraint for higher rice yield in Bangladesh. M.S. Naher and A.K. Paul deterioration of our soils resulting in stagnating or even declining of crop productivity. Paul deterioration of our soils resulting in stagnating or even declining of crop productivity The farmers of this country use, on an average, 172 kg nutrients/ha (follow similar style) annually (132 kg N + 27 kg P + 17 kg K + 4 kg S, and 2 kg Zn), while the crop removal is about 250 kg ha-1 (Islam, 1995). Use of modern varieties, use of higher doses of nitrogenous fertilizers with little or no addition of organic manure are the principal factors for soil fertility depletion in the country. Neither organic manure nor chemical fertilizer alone can increase satisfactory yield under intensive farming
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