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Nutrients required by crops

Nutrients required by crops can be divided up into major elements and micro (trace) elements (Table 4.2). Micro (trace) elements include boron, copper, iron, manganese, molybdenum, zinc and cobalt, some of which are dealt with later in this chapter. [Pg.63]

If sugar heet tops or kale are eaten by stock on the field where grown, some of the nutrients will be returned to the soil. [Pg.64]

Phosphate is supplied by fertilisers and organic matter from manures or plant debris. Soluble fertilisers provide hydrogen phosphate for inunediate use by the plant while insoluble fertilisers need to be worked on by bacteria and the action of weak acids in the soil before they can be used. Oiganic matter phosphate goes through a transition phase of microbial phosphate before becoming hydrogen phosphate in soil solution. [Pg.65]

Potassium comes from organic manures and plant debris as well as fertilisers. Within the soil there are three types of potassium water-soluble potassium which is available to plants, exchangeable potassium (an intermediate stage) and a potassium reserve held in the clay lattices within the soil which, by the action of weathering, becomes available over a period of time. [Pg.65]

Sulphur is provided by fertilisers, organic matter and as sulphur dioxide and sulphurous acid in rainfall (acid rain). Organic matter sulphur is converted to sulphur and then sulphate by microbial action. Under anaerobic conditions sulphur can be lost from the soil in the form of hydrogen sulphide (a gas smelling of bad eggs). Table 4.3 shows the major plant foods for crop growth. [Pg.65]


See other pages where Nutrients required by crops is mentioned: [Pg.38]    [Pg.63]   


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