Soil Science - Study Mode
[#831] Soil composed of which type of clays, are best suited for agriculture?
Correct Answer
(C) Chlorite and Illite
Explanation
Solution: Generally, soil contains 40 - 45 % inorganic matter, 5% organic matter, 25% water and 25% air. To sustain plant life, the proper mix of air, water, minerals and organic material is required. Normally for agriculture purposes, Loamy-textured soils with equal distribution of sand, silt and clay are considered best. However, the clay soils have great potential and are very fertile specifically with the presence of Chlorite and Illite .
[#832] Who is considered the father of field plot technique
Correct Answer
(A) J. B. Boussingault
Explanation
Solution: Jean Baptiste Boussingault , was a French chemist who was considered the father of the field-plot technique. This technique is used to maintain a balance sheet that showed how much of the various plant nutrient elements came from the composition of his crops during various stages of growth came from rain, soil and air, analyzed.
[#833] When Fe contents in plants falls below or equal to . . . . . . . . ppm, deficiency in likely to occur
Correct Answer
(A) 50
Explanation
Solution: When Fe contents in plants fall below or equal to 50 ppm , deficiency is likely to occur in plants. Iron helps the plant move oxygen throughout the roots, leaves and other parts of the plant, producing the green colour that shows the good health status of the plant.
[#834] Reclamation disease due to copper deficiency occurs in plants grown on newly reclaimed
Correct Answer
(B) Aridisols
Explanation
Solution: Reclamation disease is the disorder that affects crops grown on reclaimed land and is caused by the deficiency of trace elements like copper. Reclamation disease due to copper deficiency occurs in plants grown on newly reclaimed is known as Ardisols .
Aridisols are CaCo 3 - containing soils of arid regions that exhibit subsurface horizon development.
[#835] Match the following columns: Column I (Fertilisers) Column II (N- content %) a. Sodium nitrate 1. 13 b. Calcium nitrate 2. 16 c. Potassium nitrate 3. 15 d. Urea 4. 46
Correct Answer
(D) a-2, b-3, c-1, d-4
Explanation
Solution: Sodium nitrate supplies water supplies a water-soluble form of nitrogen without altering the pH of the soil. It contains 16% of nitrogen. Calcium nitrate fertilizer is a water-soluble chemical solution that provides plants with supplemental calcium and nitrogen. Its nitrogen content is about 15%. Potassium nitrate fertilizer is a water-soluble fertilizer with high potassium and nitrogen content along with an optimal amount of sodium, its nitrogen content is 13%. Urea is the most important nitrogenous fertilizer and is widely used also because of its high Nitrogen content which is about 46%.