The endemic tree Acacia koa is used to reforest abandoned agricultural lands in Hawaii. Growth may be constrained by soil infertility and toxic concentrations of aluminum (Al) and manganese (Mn) in acidic Oxisols and Ultisols. The effects of phosphorus (P) fertilization at time of planting, soil type, and seed source on koa growth were studied for three years. Phosphorus, applied as triple supe...

A field experiment was carried out at Agricultural Researchs and the Experiments Station in Wasit province during 2019-2020 season. This study aimed to investigate effect of three factors, first being biofertilizer levels (without addition , a combination Bacillus megaterium + Glomus mosseae complet G. mosseae, Azotobacter chroococcum, B. Azospirillum brasilense). second factor vermicompost (wi...

Abstract—The enhanced need for food items is receiving more importance due to a gradual increase in the world population and, in this scenario, fertilizers play a very important role in agriculture. In this study, the production of the normal superphosphate was investigated with a continuous chamber method by adding potassium chloride to a mixture of Hibin apatite and Kingisepp phosphorite. In ...