Question

Give the two factors that determine soil fertility.​

Answer 1

Answer:

Soil fertility is influenced by the physical, chemical and biological properties of soil. These are the two factors that determine soil fertility...

Adequate nitrogen and phosphorus content in the soil makes the soil more fertile.

Organic materials also play an important role in increasing soil fertility.

Explanation:

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Answer 2

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Soil fertility depends on is composition. Sandy soil is not suitable for agriculture as they do not retain water which the plant roots need for survival. The ideal soils contain a mixture of sand and clay. 2) The humus content determines soil fertility. Organic farm yard manures improve the humus content.

soil pH: this determines which nutrient becomes available for plant use.

Presence of organic matter: organic materials have nutrients in them that need to be recycled for the next growing cycle. Increasing soil organic matter content means you are increasing the fertility of the soil.

Moisture content : nutrients available in the soil for plant use are mostly found in the soil solution, not in the solid matrix. Soil with low moisture content are not very fertile.

Antagonistic effect of another nutrient : the presence of certain elements in the soil can make other elements unavailable. Eg. Iron compounds always precipitate with phosphorus, and excess potassium can make magnesium unavailable.

Bulk density: you don't want your soil to be compacted. Because compaction can obstruct root penetration. If the roots cannot penetrate the soil, then they can't reach the nutrients.

Clay content: this factor determines the cation exchange capacity of the soil. Higher CEC means more nutrients would be temporarily reserved for when the plants need them. Low CEC means that nutrients can be easily lost by leaching off to the ground water.