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15
CH3041
SOIL FERTILITY
• Fertile soils contain
suficient of the macro-elements such as: N, P, K,
Mg, Ca, S to produce a desired plant crop.
• Soil humus is the reservoir for N.
• Weathered minerals provide P & K.
• Often the natural levels of N, P and K must be supplemented by fertilisers to enable high crop yields to be maintained.
• Fertilisers such as 6-12-8
(N-P-K) are used.
• The natural
levels of the macroelements
present in soils are linked to the other
reservoirs within the geochemical cycles.
present in soils are linked to the other
reservoirs within the geochemical cycles.
