Inorganic Fertilizers: Types, Properties, and Efficient Use – PenExam

Inorganic Fertilizers: Types, Properties, and Efficient Use

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Question No. 1 Marks +1 -0 Time

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Urea is a widely used nitrogenous fertilizer. Which of the following statements about urea is TRUE?

A. It is an acidic fertilizer and lowers soil pH significantly upon application.
B. It contains nitrogen in the amide form, which needs to be converted to ammonium and nitrate for plant uptake.
C. It is highly resistant to volatilization losses, even when left on the soil surface.
D. It is primarily used as a source of phosphorus due to its high P content.

Question No. 2 Marks +1 -0 Time

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The primary reason for applying phosphatic fertilizers in the root zone (e.g., banding) rather than broadcasting on the surface, especially in soils with high fixation capacity, is related to which property of phosphorus?

A. Its high mobility in soil, leading to rapid leaching.
B. Its susceptibility to denitrification under anaerobic conditions.
C. Its tendency to become quickly fixed and unavailable to plants when in contact with soil minerals.
D. Its rapid volatilization from the soil surface under high temperatures.

Question No. 3 Marks +1 -0 Time

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Match the following inorganic fertilizers with their primary nutrient content:

List I (Fertilizer Type)	List II (Primary Nutrient)
A. Muriate of Potash	1. Nitrogen
B. Urea	2. Phosphorus
C. Single Superphosphate	3. Potassium

Which of the following correctly matches List I with List II?

A. A-3, B-1, C-2
B. A-1, B-3, C-2
C. A-2, B-1, C-3
D. A-3, B-2, C-1

Question No. 4 Marks +1 -0 Time

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A fertilizer bag is labeled 15-10-20. What does this indicate about its nutrient composition?

A. It contains 15% Potassium, 10% Phosphorus, and 20% Nitrogen by weight.
B. It contains 15% Nitrogen, 10% Phosphorus (as P2O5), and 20% Potassium (as K2O) by weight.
C. It contains 15 kg of Nitrogen, 10 kg of Phosphorus, and 20 kg of Potassium per 100 kg bag.
D. It contains 15 parts Nitrogen, 10 parts Phosphorus, and 20 parts Potassium by volume.

Question No. 5 Marks +1 -0 Time

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Which of the following is a key disadvantage of using Ammonium Nitrate (AN) as a nitrogen fertilizer compared to Urea?

A. Lower nitrogen content, requiring more product for the same N application.
B. Higher susceptibility to volatilization losses when surface-applied.
C. Increased risk of explosion under improper storage and handling conditions.
D. Slower release of nitrogen, making it less suitable for immediate crop needs.

Question No. 6 Marks +1 -0 Time

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Which type of inorganic fertilizer is generally recommended for soils with a high pH (alkaline) to help lower it or prevent further increase in pH?

A. Calcium Nitrate
B. Potassium Chloride
C. Ammonium Sulfate
D. Urea

Question No. 7 Marks +1 -0 Time

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Consider the following pairs regarding nutrient deficiency symptoms in plants:
1. Nitrogen: General yellowing (chlorosis) of older leaves
2. Phosphorus: Stunted growth, dark green leaves, sometimes purplish discoloration
3. Potassium: Necrosis (burning) of leaf margins, especially on older leaves
4. Iron: Interveinal chlorosis on young leaves

How many of the above pairs are correctly matched?

A. Only one
B. Only two
C. Only three
D. All four

Question No. 8 Marks +1 -0 Time

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Arrange the following steps in the typical sequence of nitrogen transformation after urea application to soil:
1. Nitrification
2. Hydrolysis
3. Volatilization
4. Leaching (of nitrate)

Choose the correct sequence:

A. 2, 1, 4, 3
B. 2, 3, 1, 4
C. 1, 2, 3, 4
D. 2, 1, 3, 4

Question No. 9 Marks +1 -0 Time

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Which of the following is NOT considered a primary macronutrient but is essential for plant growth and often supplied via inorganic fertilizers?

A. Calcium
B. Magnesium
C. Sulfur
D. Zinc

Question No. 10 Marks +1 -0 Time

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Denitrification is a significant pathway for nitrogen loss from soils, particularly under what environmental conditions?

A. Warm, well-aerated soils with low organic matter.
B. Cold, dry soils with high pH.
C. Anaerobic (waterlogged) conditions with ample organic matter and nitrate.
D. High light intensity and low soil moisture.

Question No. 11 Marks +1 -0 Time

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What is the main advantage of foliar application of fertilizers compared to soil application for certain micronutrients?

A. It provides a slower, more sustained release of nutrients to the plant.
B. It is less expensive and requires simpler equipment than soil application.
C. It allows for rapid correction of nutrient deficiencies and bypasses soil fixation issues.
D. It significantly increases the overall nutrient use efficiency for all essential elements.

Question No. 12 Marks +1 -0 Time

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Which property of certain inorganic fertilizers makes them prone to caking during storage, especially in humid conditions?

A. Low solubility in water.
B. High bulk density.
C. Hygroscopicity.
D. Low nutrient content.

Question No. 13 Marks +1 -0 Time

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Phosphate fixation in acid soils is primarily due to the formation of insoluble compounds with which elements?

A. Sodium and Magnesium
B. Calcium and Potassium
C. Iron and Aluminum
D. Manganese and Boron

Question No. 14 Marks +1 -0 Time

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Excessive use of nitrogenous and phosphatic fertilizers can lead to which environmental problem in aquatic ecosystems?

A. Soil erosion
B. Acid rain
C. Eutrophication
D. Desertification

Question No. 15 Marks +1 -0 Time

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If a farmer needs to apply 90 kg of Nitrogen per hectare and uses Urea (46% N), how much Urea (in kg) is required per hectare?

A. 195.65 kg
B. 41.40 kg
C. 205.00 kg
D. 90.46 kg

Question No. 16 Marks +1 -0 Time

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Match the following fertilizer application methods with their primary characteristics:

List I (Application Method)	List II (Characteristic)
A. Broadcasting	1. Application through irrigation water
B. Banding	2. Uniform spreading over the entire field surface
C. Fertigation	3. Placing fertilizer in concentrated strips near plants

Which of the following correctly matches List I with List II?

A. A-2, B-3, C-1
B. A-1, B-2, C-3
C. A-3, B-1, C-2
D. A-2, B-1, C-3

Question No. 17 Marks +1 -0 Time

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Which of the following is an example of a slow-release nitrogen fertilizer, designed to provide nutrients over an extended period?

A. Ammonium Nitrate
B. Urea-Formaldehyde (UF)
C. Potassium Chloride
D. Diammonium Phosphate (DAP)

Question No. 18 Marks +1 -0 Time

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How does a high Cation Exchange Capacity (CEC) of soil generally impact the retention and availability of positively charged nutrient ions (cations) from fertilizers?

A. It decreases the soil's ability to hold cations, leading to increased leaching.
B. It increases the soil's ability to hold cations, reducing leaching and improving availability.
C. It has no significant effect on cation retention, only on anion retention.
D. It increases the rate of cation volatilization from the soil surface.

Question No. 19 Marks +1 -0 Time

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Single Superphosphate (SSP) contains which primary nutrient and in what approximate percentage range (as P2O5)?

A. Nitrogen, 18-20%
B. Phosphorus, 16-20%
C. Potassium, 40-50%
D. Sulfur, 10-12%

Question No. 20 Marks +1 -0 Time

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What is the primary purpose of conducting a soil test before applying inorganic fertilizers?

A. To determine the soil's water holding capacity and irrigation needs.
B. To identify the presence of soil-borne diseases and pests.
C. To assess the current nutrient status of the soil and recommend appropriate fertilizer types and amounts.
D. To measure the soil's resistance to compaction and erosion.

Question No. 21 Marks +1 -0 Time

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Consider the following statements about properties of common inorganic fertilizers and their practical implications:
1. Urea has a high nitrogen content, making it economical to transport per unit of N.
2. Diammonium Phosphate (DAP) is an excellent source of both nitrogen and phosphorus.
3. Muriate of Potash (KCl) is highly soluble, leading to quick availability of potassium.
4. Granular fertilizers generally have a lower caking tendency than powdered fertilizers.

How many of the above statements are correct?

A. Only one
B. Only two
C. Only three
D. All four

Question No. 22 Marks +1 -0 Time

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Which of the following essential plant nutrients is considered highly mobile within the plant, meaning deficiency symptoms typically appear on older leaves first?

A. Iron (Fe)
B. Calcium (Ca)
C. Nitrogen (N)
D. Boron (B)

Question No. 23 Marks +1 -0 Time

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Diammonium Phosphate (DAP) is an example of a complex fertilizer because:

A. It contains a high percentage of a single primary nutrient.
B. It is produced through a simple physical blending process.
C. It provides two or more primary nutrients (N, P, K) in a chemically combined form.
D. It is a controlled-release fertilizer that releases nutrients slowly.

Question No. 24 Marks +1 -0 Time

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Arrange the following steps in the logical order for determining fertilizer recommendations for a crop:
1. Interpret soil test results
2. Consider crop nutrient requirements and yield goals
3. Collect representative soil samples
4. Adjust recommendations based on local conditions and economic factors

Choose the correct sequence:

A. 3, 1, 2, 4
B. 1, 3, 2, 4
C. 3, 2, 1, 4
D. 2, 1, 3, 4

Question No. 25 Marks +1 -0 Time

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The process by which plants absorb dissolved inorganic nutrient ions from the soil solution is primarily through:

A. Photosynthesis in the leaves.
B. Transpiration through stomata.
C. Active and passive transport mechanisms in the root system.
D. Respiration in the mitochondria.

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