Acid soil is a hindrance to agricultural productivity and a threat to food and environmental security. Research was carried out to assess the impact of lime and organic manure (OM) amendments on yield and nutrient uptake by using the T. Aman-Maize-Fallow cropping pattern in acid soils. The experiment was set up in an RCBD design and used nine treatments and three replications. The treatments, comprising of various doses of lime, OM (cow dung and poultry manure), and a lime-OM combination, were applied to the first crop, T. Aman (Binadhan 7), and in the next crop, maize (BARI Hybrid Maize-9), the residual impacts of the treatments were assessed. Results demonstrate that the highest grain yield, 4.84 t ha−1 (13.61% increase over control) was recorded for T. Aman and 8.38 t ha−1 (58.71% increase over control) for maize, was achieved when dololime was applied in combination with poultry manure. The total rice equivalent yield increase over the control ranged from 20.5% to 66.1%. The application of lime with cow dung or poultry manure considerably enhanced N, P, K, and S content and uptake in both crops, compared to the control. Thus, it may be inferred that using dololime in association with poultry manure can increase crop productivity in acid soils.

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Despite the fact that people are more familiar with its drawbacks, water hyacinth has a variety of uses. This study aims to assess local inhabitants' opinions of water hyacinth and its sustainable, environmentally beneficial uses. In order to perform the study properly, we moved on to the study areas that are closer to Roa beel and a questionnaire with seven components and seven parameters was used. The Roa Beel is situated in the Chandpur Union neighborhood of the Kishoregonj district's Katiadi Upazila, Kishoreganj, Bangladesh. During the rainy season, excessive water hyacinth was found in the study region, and people of the villages of Sheker Para, Purbo Para, and Modinas Para in the Kishoregonj district were surveyed. The study assesses the locals' perceptions of their knowledge and understanding of water hyacinth, their management techniques, the benefits and drawbacks of water hyacinth, and their actual use of it in their daily lives as well as in various sectional activities like fishing, livestock rearing, agricultural farming, particularly in floating agricultural practices, and for industrial purposes. A surplus of water hyacinth in the beel can be utilized to create a promising industry for the region, especially if it is converted into affordable, environmentally acceptable animal feed, bio-fertilizer, and biogas. Undoubtedly, this will improve local environmental management efforts and provide more opportunity for local unemployed people to find employment.

The world’s reliance on non-renewable energy sources is unsustainable, and biogas production from organic waste materials is a promising renewable energy source. However, there is a lack of technology and understanding surrounding biogas production and utilization. This study aimed to produce biogas at laboratory scale using cafeteria waste and to examine the processes of biogas production for variable factors such as retention time, pH level, and addition of bases. The findings showed that a mixture of papaya peels, water, cow manure, and a base produced an impressive 80.75% methane yield within 75 days under mesophilic conditions with a specific pH and temperature range. However, maintaining optimal pH and vacuum in a biogas chamber presents challenges, such as leakages and pH fluctuations. The optimal ratio for biogas production is a mixture of 45-50% organic matter and 55-60% water, with careful regulation of base addition to ensure maximum biogas production and optimal biogas quality. This study provides insights into biogas production and its potential as a viable biofuel alternative.