Soil Fertility,Fertilisers and Micronutrients — DU B.Sc. (Prog.) Applied Life Sciences with Agrochemicals and Pest Management pertaining to Chemistry Previous Year Question Papers

- Agrochemical and Pest Management 1. (a) Answer the following: (i) A nitrogenous fertilizer commonly known as 'Chile Șaltpetre'. (ii) An efficient liming material to correct soil acidity. (iii) Oxidation of ammonia or ammonium ions into nitrate ions by nitrifying bacteria. (io) A beneficiary nutrient required by the plants. (0) An amide fertilizer containing approximately 46% nitrogen. What are the advantages and disadvantages of chemical fertilizers? How is ammonium dihydrogen phosphate prep.ared on small scale? (a) Explain the different chemical reactions involved in neutralizing soil List out the primary and secondary nutrients required by the plants. How is urea manufactured? Explain the chemical reactions involved. (c!) .What is the weathering of rocks ? Explain the different types of weathering. (a) Phosphatic fertilizers are significarit for plapt nutrition. Explain the various classes of phosphatic' fertilizers along with examples. (c) What are biofertilizers? Explain the different types of biofertilizers. (cI) (a) (c) What ire the different types of soil found in India ? Briefly, explain the characteristics of each type. Calculate the quantity of uiea and MOp required for one hectare of tomato field. The, recommended dose of NPK fertilizer is 120:50:40 kg/ Explain the preparation and properties of potassium.sulphate fertflizer. List out the differences between nitrification and denitrification. 6. Write short notes on (any ffaree) : (ci) Polylner coated urea (a) Organic matter (c) Bone meal , (cZ) Muriate of potash.