Give reasons,why?
Farmers grow crop of Trifolium (Family Leguminosae) and plough it back in the field to reemove the nitrogen deficiency uin soil.

Give reasons,why? Nitrogen deficiency leads to formation of purple colour in stems etc.of some plants.

A farmer has a supply of chemical fertilizer of type A which contains 10 % nitrogen and 6% phosphoric acis and type B fertilizer which contains 5% nitrogen and 10% phosphoric acid. After testing the soil condition of a field, it is found that at least 14 kg of nitrogen and 14 kg of phosphoric acid are required for a good crop. The fertilizer type A costs Rs 5 per kg and type B Rs 3 per kg. How many kilograms of each fertilizer should be used to meet the requirements and the cost be minimum? Using LPP, solve the above problem graphically.