Organic matter is important in improving the quality of soil for crop production for several reasons, including all the options you've listed:
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Aiding root extension: Organic matter helps to improve soil structure, making it easier for roots to penetrate the soil and extend efficiently in search of water and nutrients.
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Reducing crust formation: Organic matter can help to prevent the formation of a hard crust on the soil surface, which can inhibit water infiltration and make it difficult for seeds to germinate.
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Reducing soil erosion: Organic matter can improve soil structure and increase aggregate stability, which helps to reduce soil erosion by wind and water. Well-structured soil is less prone to being washed or blown away.
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Supplying plant nutrients: Organic matter acts as a reservoir for nutrients, releasing them slowly as it decomposes. It also contributes to soil fertility by providing essential nutrients that plants need for growth.
Given these important functions, the answer is All; organic matter plays a crucial role in enhancing soil quality for crop production.
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