Manures are applied to provido nutrients to crop plants. Proper nutrition is necessary for the normal growth and reproduction of plants. It is recognised that malnutrition or deficiencies in the nutrients lead to several diseases in men and cattle. Plants are also similarly affected by unbalanced manuring or by the lack of one or more components of plant food. The effects may be directly visible as different types of hunger' signs (chiefly chloroses and reduced growth) exhibited by the crop, depen- ding on the particular component in deficit. But these become evident only when the deficiency is pronounced. The influence may also be felt by the upsetting of the equilibrium of host-parasite relationship between the crop plants and disease-causing organisms. Consequently the inten- sity of incidence of diseases caused by parasites may be altered.
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Tamil Nadu Agricultural University
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Madras Agricultural Journal (MAJ)
Madras
Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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