Soil Science - Study Mode
[#941] With increase in base saturation, soil pH
Correct Answer
(A) Increases
Explanation
Solution: Base saturation is the sum of the base cations held onto the soil exchange sites divided by the total CEC and expressed as a percentage. Base saturation is calculated as the percentage of CEC occupied by base cations. Depending on soil pH, the soil's base saturation may be a fraction of CEC or approximately equal to CEC (Cation Exchange Capacity). With an increase in base saturation, soil pH increases.
[#942] A fertilizer is having 20-10-10 Fertilizer Grade, what will be it's Fertilizer Ratio?
Correct Answer
(C) 2-1-1
Explanation
Solution: To determine a fertilizer ratio for a recommendation, divide the weight of each of the nutrients by the nutrient with the lowest weight. Thus here, A fertilizer is having 20-10-10 fertilizer grade, dividing the weight of each of the nutrients by 10 (lowest one), the fertilizer ratio will be 2-1-1.
[#943] The vertical section of soil, which shows different horizons, is called
Correct Answer
(B) Soil profile
Explanation
Solution: The vertical section of soil, which shows different horizons is called the Soil profile . It extends from the soil surface to the parent rock material. A soil horizon is a layer parallel to the soil surface whose physical, chemical and biological characteristics differ from the layers above and beneath.
[#944] A soil layer of maximum leaching is indicated by the symbol of
Correct Answer
(B) A 2
Explanation
Solution: A soil layer of maximum leaching is indicated by the symbol of A 2 . Leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. It is the practice of applying a small amount of excess irrigation where the water has a high salt content to avoid salts from building up in the soil.
[#945] Soluble salt content which damages crop growth is
Correct Answer
(A) 0.1 - 0.2%
Explanation
Solution: Salt is present in soluble form in saline soils, as well as in irrigation water. The excess salt content hampers the crop yield, thus it is lowered by adding fertilizers and other nutrients. Salinity affects production in crops, pastures, and trees by interfering with nitrogen uptake, reducing growth, and stopping plant reproduction. Soluble salt content which damages crop growth is 0.1 - 0.2%.