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Soils with Chemical Problems
Published in Manorama K.C. Thampatti, Problem Soils, 2023
Soil pH will influence both the availability of soil nutrients to plants and how the nutrients react with each other. At a low pH many elements become less available to plants, while others such as iron, aluminum and manganese become toxic to plants and in addition, aluminum, iron and phosphorus combine to form insoluble compounds. In contrast, at high pH levels calcium ties up phosphorus, making it unavailable to plants, and molybdenum becomes toxic in some soils. Boron may also be toxic at high pH levels in some soils. The common problems encountered are described below.
Soil Chemical Properties
Published in L.B. (Bert) McCarty, Golf Turf Management, 2018
Plant nutrients in soil solution possess an electrical charge, either positive (called cations) or negative (called anions). Many soil nutrients occur naturally as complex, insoluble compounds that may not be readily available for plant use. Over time, as weathering occurs, these elements slowly enter the soil solution and become available to plants. Organic matter also may be degraded by the soil microbial population, releasing its nutrient constituents for possible plant uptake.
GRAZE: A Beef-Forage Model of Selective Grazing
Published in Robert M. Peart, R. Bruce Curry, Agricultural Systems Modeling and Simulation, 2018
Nutrients (N, P, and K) are extracted from the soil by the plant. The availability of soil nutrients may limit plant growth. Nutrients may be replenished by a fertilizer application, and nitrogen may be leached from the soil. Currently, GRAZE does not consider recycling of nutrients from deposition of fecal material by grazing animals.
Topsoil alternatives selection for surface coal-mined land reclamation in Inner Mongolia, China: an experimental study
Published in International Journal of Mining, Reclamation and Environment, 2021
Qi Zhu, Zhenqi Hu, Xueran Liu, Yuanjing Wu
Even after the addition of exogenous organic matter, the N and P content of topsoil alternatives remains at relatively low levels. Fertilisation was an effective way to increase soil nutrients. Legumes were capable of fixing nitrogen from the atmosphere through a symbiotic relationship with rhizobia, thereby increasing the N content of soil and were suitable as reclamation pioneer plants [40]. Intercropping of legumes with grasses can improve the efficiency of nitrogen fixation of legumes and can increase the ability of plants to activate phosphorus-containing compounds through root secretions [41]. Therefore, legumes (e.g., Alfalfa) and grasses (e.g. Elymus) were recommended for the reclamation of Inner Mongolian grasslands.