state atleast four impacts of using chemical fertilizers in the field.
Answers
Answer:
Short circuit test is conducted on a 5kva, 400/100v single phase transformer with 100v winding shorted. the input voltage at full load current is 40v. the wattmeter on the input reads 250w. find the power factor for which regulation at full load is zero.
Explanation:
Fertilizers - mineral "chemical" and organic fertilisers as well (!) can pollute the environment only when used in amounts not adapted to the real crop nutrient demand (as a function of expected yield) and the availability in the soil according to precedent soil analysis. Particularly the overuse of N and P will produce eutrophication of waters and N might produce leaching problems to the groundwater as well as air pollution by the emission of nitrous oxide (N2O) contributing to the greenhouse effect. Such negative effects are not specific for chemical fertilisers but for organic as well. Livestock wastes or manure may contribute to soil pollution much more than chemical fertilisers. Before discussing prejudiced the negative effects of chemical fertilisers, you should always take in mind that at least 50% of crop yield is attributable to this kind of fertiliser nutrient inputs ! Chemical fertilisers aren't negative - it is their inefficient and not demand-oriented use by unprofessional or ill- advised farmers.