What are the advantages of fertigation in agriculture ? 1. Controlling the alkalinity of irrigation water is possible. 2. Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible. 3. Increased availability of nutrients to plants is possible. 4. Reduction in the leaching of chemical nutrients is possible. Select the correct answer using the code given below:
- A.1, 2 and 3 only
- B.1, 2 and 4 only
- C.1, 3 and 4 only
- D.2, 3 and 4 only
Correct answer
Explanation
The correct answer is C, 1, 3 and 4 only. Fertigation feeds dissolved fertiliser through drip or sprinkler lines, but it cannot use insoluble rock phosphate.
Fertigation means applying fertilisers along with irrigation water, usually through a drip system, so that small doses reach the root zone exactly when the crop needs them. Because the nutrients are dissolved and placed near the roots, plants take up more of them, and less is washed below the root zone or lost as run-off. Acids such as phosphoric or nitric acid can be injected into the water, which lowers the pH of alkaline water and keeps the drippers from clogging with carbonate deposits. Only fully water-soluble fertilisers can be used in this way.
A is wrong because statement 2 is false and it leaves out statement 4. B is wrong because it includes statement 2 and leaves out statement 3. D is wrong because rock phosphate is insoluble in water, so it cannot be applied through irrigation lines, and not all phosphatic fertilisers are soluble.
Exam tip: Fertigation needs water-soluble fertilisers; it saves fertiliser, cuts leaching and can correct water pH.
Practice Questions
View allWhich one of the following is applicable to collision-coalescence process of precipitation?
- A.Clouds which do not extend beyond the freezing level
- B.Clouds which extend beyond the freezing level
- C.All types of clouds
- D.Cirrocumulus cloud
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Collision-coalescence is the way rain forms in warm clouds, whose tops stay below the level where water freezes. In such clouds all droplets are liquid.
Read the full explanation →Identify the type of drainage pattern on the basis of the given characteristics :
1. It represents the most common pattern of streams and their tributaries
2. It occurs in areas of uniform rock type and regular slope
3. A map, or aerial photograph, shows a pattern like the veins on a leaf— smaller streams join the main stream at an acute angle
Select the correct answer.
- A.Dendritic
- B.Radial
- C.Trellis
- D.Centripetal
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A pattern that looks like the branches of a tree or the veins of a leaf, formed on uniform rock with a regular slope, is dendritic.
Read the full explanation →The Research Design and Standards Organization is the R&D wing of which one of the following organizations ?
- A.Bhabha Atomic Research Centre
- B.Indian Space Research Organization
- C.Indian Railways
- D.Defence Research and Development Organization
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The Research Design and Standards Organisation (RDSO) is the sole research and development wing of the Ministry of Railways. RDSO is headquartered at Lucknow.
Read the full explanation →Which one of the following Indian States has recorded negative growth population as per Census 2011?
- A.Manipur
- B.Mizoram
- C.Tripura
- D.Nagaland
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Nagaland was the only Indian state whose population fell between 2001 and 2011; its decadal growth rate in Census 2011 was about −0.6 per cent.
Read the full explanation →Piecing together the puzzle of geologic time to create and analyze historical maps of the Earth is known as
- A.paleoclimatology
- B.paleogeomorphology
- C.paleolithology
- D.paleogeography
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Paleogeography is the study of the Earth's geography in the geological past, and its main product is a set of maps showing where continents, oceans, mountains and shorelines lay at different times.
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