Abstract
Humic acid (HA) and poultry manure (PM) were applied on T. aman rice cv. BRRI dhan39 to observe their effects on rice. Three levels of humic acid viz. 0, 3 and 6 L ha -1 and three levels of poultry manure viz. 0, 3 and 6 t ha -1 were applied along with recommended doses of N, P, K and S fertilizers from urea, TSP, MoP and gypsum, respectively following Randomized Complete Block Design (RCBD). Parameters used in the experiment were plant height, effective tillers hill -1 , panicle length, no. of grains panicle -1 , 1000-grain weight, grain and straw yields. The application of different treatments showed positive trend in all the parameters of BRRI dhan39. The highest grain yield (4.07 t ha -1 ) was recorded by the application of 6 L ha -1 humic acid along with 3 t ha -1 poultry manure which was identical with the application of 6 L ha -1 humic acid along with 6 t ha -1
Highlights
Rice is the main staple food of Bangladesh
The results suggest that poultry manure offered better nutritional quality and favorable balance of nutrients when supplemented with NPK which provided the maximum yield
The grain yield increased was 17.93% when poultry manure was applied @ 6 t ha-1 and it was 5.52% when it was applied @ 3 t ha-1
Summary
Rice is the main staple food of Bangladesh. About 80% of cropped area is used for rice cultivation, with annual production of 4,37,29,000 metric tons (IRRI, 2006). Continuous use of chemical fertilizers accelerated the depletion of soil organic matter and impairs physical and chemical properties of soil in addition to causing micronutrient deficiencies. In Bangladesh, most of the cultivated soils have less than 1.5% organic matter. This important component of soil is declining with time due to intensive cropping and use of higher doses of chemical fertilizers with little or no addition of manure. Humic acid improves the physical, chemical and biological properties of the soil and influences plant growth by influencing the growth of roots. Global environment pollution can be reduced considerably by reducing the use of chemical fertilizers and increasing the use of cowdung, poultry manure, rice straw and others. A soil management strategy must be based on maintaining soil quality, which is only possible by utilization of high quality manures along with inorganic fertilizers
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