FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mineral material (rock pieces)
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Organic matter
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Water
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Air
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Fertilizer
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Detailed explanation-1: -Potassium, Nitrogen, and Phosphorous are normally derived from the soil in the form of inorganic salts and are nutrients available in fertilizers that make up 0.5 to 6.0 percent. Hence iron is a nutrient that is not available in fertilizers.
Detailed explanation-2: -Nitrogen, phosphorus and potassium, or NPK, are the “Big 3” primary nutrients in commercial fertilizers.
Detailed explanation-3: -Most fertilizers that are commonly used in agriculture contain the three basic plant nutrients: nitrogen, phosphorus, and potassium. Some fertilizers also contain certain “micronutrients, ‘’ such as zinc and other metals, that are necessary for plant growth.
Detailed explanation-4: -Final answer: “They are environment-friendly” is an incorrect statement for fertilizers.
Detailed explanation-5: -The correct option is B Azospirillum.