write an account on chemical properties of soil for 5 marks
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heya...
Answer:
Soil chemistry is the interaction of various chemical constituents that takes place among soil particles and in the soil solution—the water retained by soil. The chemical interactions that occur in soil are highly complex, but understanding certain basic concepts will better help you manage turf and ornamentals.
Nutrition. Having discussed water relations, it now is a bit simpler to discuss nutrient-holding capacity. Soils hold onto nutritional elements in a way similar to the way they retain water: Positively charged nutrient molecules, cations, are attracted to the negative charges on the soil particles. This is called adsorption. The sites where cations attach to particles are cation-exchange sites Thus, clay retains more nutrients than coarser soils, just as it holds more water, because of the greater surface area (greater number of cation exchange sites) to which nutrients can adsorb.
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A balanced soil chemistry
It starts with the minerals balance in the soil. The task of the fertilisers is to balance the chemistry of the soil and to feed the crop. The ideal content of the clay-humus complex (CEC) is 60-70% calcium, 10-20% magnesium and 2-5% potassium, which always leaves 10% that can be filled with hydrogen. Hydrogen determines the pH of the soil and is crucial to keeping soil life active and creating availability of the nutrients.
The chemical soil fertility is largely determined by the presence of macro-elements, the presence of micro-elements or trace elements, the acidity or pH, the salt content or EC and the cation-exchange capacity or CEC.
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