An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during Boro season of 2008 with a view to examining the effect of soil and foliar application of urea on the yield and nutrient uptake of BRRIdhan 29 and to evaluate whether urea foliar application (FA) could replace its soil application (SA) in the rice cultivation. The experiment was laid out in a randomized complete block design (RCBD) with eight treatments, each treatment replicated thrice. The treatments were: T 1 (control), T 2 (282 kg urea ha -1 SA), T 3 (1% urea solution FA), T 4 (2% urea solution FA), T 5 (3% urea solution FA), T 6 (94 kg urea ha -1 SA + 1% urea solution FA), T 7 (94 kg urea ha -1 SA + 2% urea solution FA) and T 8 (94 kg urea ha -1 SA + 3% urea solution FA). The results showed that soil and foliar application of nitrogen significantly influenced the growth and yield of crop. The treatment T 2 (282 kg urea ha -1 ) produced the highest grain yield (5.34 t ha -1 ). The T 6 (94 kg urea ha -1 + 1% urea solution FA) produced the highest straw yield (6.58 t ha -1 ) of the crop. The lowest grain yield (3.20 t ha -1 ) and the lowest straw yield (4.19 t ha -1 ) were recorded with T 1 (control). Economic analysis showed that treatment T 2 gave the highest marginal benefit cost ratio (7.65) while the lowest value (2.71) was observed with T 5 treatment. The overall results demonstrated that soil application of 282 kg urea ha -1 was the best treatment for obtaining higher grain yield, higher nitrogen content of rice and higher marginal benefit cost ratio, and soil application is better than foliar application of urea.
Different crops have variations in their responses to applied micronutrients in soil. A study was conducted on floodplain soil of Bangladesh to explore the response of potato to application of micronutrients in soil. The experimental site was located at farmers’ field in Chandina upazila under Cumilla district of Bangladesh covering the soils of Old Meghna Estuarine Floodplain (AEZ 19) during 2011-12. Randomized complete block design with 3 replications of each treatment was used in the experiment, where seven treatments including a control were tested. Additive element trial technique was followed while designing the treatments taking six micronutrients i. e. Zn, B, Cu, Mn, Fe and Mo at the rate of 3, 2, 2, 3, 5 and 1 kg ha-1, respectively. Macronutrients, such as N, P, K and S were applied at recommended rates to all plots. The highest tuber yield (28.7 t ha-1) was produced by the combined application of Zn and B. Only Zn application was sufficient to obtain the highest content of protein as well as content of almost all the nutrients in potato tuber. Antagonistic relation between Zn and P in soil-plant system was recorded in the study. Zinc and boron application influenced different growth and yield parameters of potato while the other four added micronutrients did not have any significant effect but combined application of Zn, B, Cu, Mn, Fe and Mo had beneficial role for better plant growth and production. Proper management of zinc and boron fertilizers including optimization of application rates of those nutrients can help to uphold the yield and quality of potato in floodplain soil. SAARC J. Agri., 16(2): 97-108 (2018)
Soil micronutrient deficiency has arisen in Bangladesh as a consequence of soil fertility depletion with time.
A pot experiment was conducted with four soils from two locations (BAU farm, Mymensingh and BADC farm, Madhupur, Tangail) in order to monitor the transformation of added K (soil solution K, exchangeable K+ and nonexchangeable K) in BRRI dhan-41 rhizosphere at saturation condition. There were six levels of K viz., 0, 30, 60, 90,120 & 150 kg/ha from MoP. Eight kg soil was taken into each pot. The K concentration in soil solution increased with increasing K addition and decreased with increasing incubation period. Soil solution K was drastically reduced at 45 days due to higher crop uptake. The amount of exchangeable K also increased with increment of added K and gradually decreased over time. The non-exchangeable K increased up to 45 days and then decreased up to 105 days. Keywords: Rice rhizosphere; exchangeable K+; non-exchangeable K DOI: http://dx.doi.org/10.3329/bjar.v36i3.9279 BJAR 2011; 36(3): 513-519
The lower Atrai basin, the study area, lies in the Agroecological Zone-5 (AEZ-5) of Bangladesh. This study reveals the clay mineral composition of top soils of seven different soil series viz. Binsara, Taras, Jaonia, Hasnabad, Laskara, Manda and Mainam developed in the basin. X-ray diffraction (XRD) technique was employed to identify and quantify the minerals. Results show that mica (41 to 59%) was the most dominant mineral among all soils except Laskara. In Laskara soils, the interstratified mica-vermiculite-smectite (41%) was the predominant mineral. Next to mica, kaolinite (10 to 12%) was found to be present in the Binsara, Taras 1, Jaonia, and Taras 2 soils. Chlorite (7 to 17%) was identified in all the soils and was found to be the second dominant mineral in the Manda and Mainam soils. In contrast, the interstratified mica-vermiculitesmectite (33%) was found to be the second dominant mineral in the Hasnabad soils. Small amounts of vermiculite mineral (1 to 13%) were identified in almost all the soils except Binsara. All the soils have interstratified mica-chlorite minerals (2 to 7%). A tiny amount of smectite (1%) was identified in Taras 1 soil. As far as the clay mineralogical composition is concerned, most studied soils were found at the initial stage of weathering, indicating the high potential to sustain low input subsistence agriculture. Dhaka Univ. J. Biol. Sci. 30(2): 293-306, 2021 (July)
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