As the head boy/girl of your school draft a notice urging students to buy organic manure. Mention the advantages of doing so.
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Answer:
Manures are plant and animal wastes that are used as sources of plant nutrients. They release nutrients after their decomposition. The art of collecting and using wastes from animal, human and vegetable sources for improving crop productivity is as old as agriculture. Manures are the organic materials derived from animal, human and plant residues which contain plant nutrients in complex organic forms. Naturally occurring or synthetic chemicals containing plant nutrients are called fertilizers. Manures with low nutrient, content per unit quantity have longer residual effect besides improving soil physical properties compared to fertilizer with high nutrient content. Major sources of manures are:
Cattle shed wastes-dung, urine and slurry from biogas plants
Human habitation wastes-night soil, human urine, town refuse, sewage, sludge and sullage
Poultry Jitter, droppings of sheep and goat
Slaughterhouse wastes-bone meal, meat meal, blood meal, horn and hoof meal, Fish wastes
Byproducts of agro industries-oil cakes, bagasse and press mud, fruit and vegetable processing wastes etc
Crop wastes-sugarcane trash, stubbles and other related material
Water hyacinth, weeds and tank silt, and
Green manure crops and green leaf manuring material
Manures can also be grouped, into bulky organic manures and concentrated organic manures based on concentration of the nutrients.
Bulky organic manures
Bulky organic manures contain small percentage of nutrients and they are applied in large quantities. Farmyard manure (FYM), compost and green-manure are the most important and widely used bulky organic manures. Use of bulky organic manures has several advantages:
They supply plant nutrients including micronutrients
They improve soil physical properties like structure, water holding capacity etc.,
They increase the availability of nutrients
Carbon dioxide released during decomposition acts