Abstract A successive 2-year (2019 and 2020) field experiment was conducted in northern Bangladesh (Rangpur district) to observe the status of soil quality heavy metal risk due tobacco cultivation this area. Soil samples were collected randomly from four major sub-districts Sadar, Badargonj, Gangachara, Mithapukur Upazila) where a non-cultivating rests tobacco-growing fields. Along with concent...

The exchangeable cations in dehydrated zeolites, types X and Y, are located on several energetically and coordinatively different sites. The number of vacant sites is of the same orde; of magnitude as the number of occupied sites. As a result, the motions of the cations as evidenced by the dielectric relaxation and electrical conductivity, are highly correlated. The dielectric relaxation can be...

The proportion of acidic purple soils has increased. Consequently, an effective method for amelioration is urgently needed. A 40 day incubation experiment using apple tree biochar, fermented sheep manure and chicken was conducted to assess the effects organic materials on acidity fertility soil. results showed that application increased soil pH decreased soil-exchangeable acidity. All treatment...

A cyclic consecutive-k-out-of-n: G system consists of n components lying on a cycle. Those components are exchangeable but may have different working probabilities. The system works if and only if there are k consecutive components at work. What is the optimal assignment of components for maximizing the reliability of the system? Does the optimal assignment depend on the working probability val...

[1] We use a synoptic sampling of stream water to quantify the effect of soil type, rock type, deforestation extent determined by Landsat TM imagery, and urban population density on stream solute concentrations for 60 different watersheds in the dry season and 49 in the wet season in the southwestern Brazilian Amazon basin. Catchment areas range between 18 and 12,500 km. Soil exchangeable catio...

Data-intensive technologies such as precision agriculture require new approaches for acquisition of soil data on landscapes. We compared the ability of near infrared (NIR; 400–2500 nm) and mid infrared (MIR; 2,500– 25,000 nm) spectroscopy for field-scale acquisition of soil fertility parameters. Samples were obtained in a grid pattern (25 m spacing) from the surface (0–10 cm) and sub-surface (1...

We investigated the mechanisms of Hg sorption onto biochars produced from Brazilian pepper (BP; Schinus terebinthifolius) at 300, 450, and 600 °C using different analytical techniques. The Hg sorption capacity of BP300, BP450, and BP600 was 24.2, 18.8, and 15.1 mg g(-1) based on Langmuir isotherm. FTIR data suggested the participation of phenolic hydroxyl and carboxylic groups in Hg sorption by...