potassium (k) is an element essential for plant growth, playing a significant role in physiological and biochemical processes in plant. the relationship between a soil testing extractant vs. plant nutrient uptake should be a determining parameter in the selection of a soil testing method. the objective of this study was to evaluate different extractants employed for extracting available k in 10...

The available status of Fe, Mn, Cu and Zn in two soils (Melandaha-Silt loam Dhamrai-Silty clay loam) was determined by extraction methods (0.5 M DTPA 0.1 N HCI). previously treated with various composts and/or compost plus fertilizer Amaranthus grown upto 42 days. After harvest Amaranthus, the were extracted 0.5 HCI extracts analyzed for trace elements contents. availability varied significantl...

The objective of this study was to evaluate the relationship four different soil test phosphorus methods (Mehlich 3, Bray 1, 2, and Haney H3A) for corn production, determine critical P tissue concentration at growing stages. experiment conducted 12 locations, fertilizer treatments consisted five rates applied by broadcast pre-plant. Soil samples were collected 0- 6-in. depth, then before treatm...

Heavy oil is considered as a multipurpose complex mineral, and the processing of heavy oils “complex problem”, aimed both at increasing yield light fractions “transport” ability oil, extracting metals from asphaltene resinous fraction. The recovery (such vanadium, nickel, titanium, iron, etc.) was performed by cavitation extraction technology with use hydrocarbon solvents chemical extractants, ...

keep in mind the importance of cadmium, cobalt and nickel ions as environmentally and economically strategic heavy metals, the application of two acidic extractants, named bis(2-diethylhexyl)phosphoric acid (dehpa) and 2-thenoyltrifluoroacetone (htta), was assessed for the extraction-recovery of these ions from leached solution of spent rechargeable ni-cd batteries. the conditions for leaching ...