Soil Science - Study Mode
[#676] AVCR = 1 means
Correct Answer
(C) no profit no loss
[#677] Soil materials deposited by glaciers is
Correct Answer
(D) Both B and C
Explanation
Solution: Soil materials deposited by glaciers are known as Moraine and Till. A moraine is a material left behind by a moving glacier. This material is usually soil and rock. Rivers carry along all sorts of debris and silt that eventually builds up to form deltas, glaciers transport all sorts of dirt and boulders that build up to form moraines. Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines.
[#678] The pH of the soil solution determines
Correct Answer
(A) Active acidity
Explanation
Solution: The pH of soil solutions determines active acidity. However, soil pH is a measure of the concentration of hydrogen ions in the soil solution. Whereas active acidity is the number of hydrogen ions that are available in the soil water solutions undergoing pH tests.
[#679] Single Super Phosphate is produced by reacting Rock Phosphate with
Correct Answer
(A) H 2 SO 4
Explanation
Solution: Single super phosphate (SSP) is produced by reacting rock phosphate with sulphuric acid (H 2 SO 4 ). The chemical formula of SSP is Ca(H 2 PO 4 ) 2 ยท 2H 2 O (Monocalcium Phosphate Dihydrate) . In SSP, the phosphorus is in the form of P 2 O 5 and contains 16% P 2 O 5 . SSP is the most popular phosphatic fertilizer after DAP containing 3 major plant nutrients namely phosphorus, Sulphur and Calcium along with many micronutrients.
[#680] Fe concentration used for foliar spray is
Correct Answer
(B) 0.4%
Explanation
Solution: Fe concentration used for the foliar spray is 0.4%. The application of foliar sprays is a common means of correcting Fe deficiency in crops. Applying chelated iron to the soil is the most effective way of correcting yellow leaves as it requires just a single application. Foliar spray is used when rapid response is needed to correct a chlorotic condition. A foliar spray with iron sulphate or iron chelate solution may be applied when the tree is in full leaf.