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Question
The material of biological origin, which is used to maintain and improve soil fertility is
The material of biological origin, which is used to maintain and improve soil fertility is
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Solution
The correct option is D Green manure
In agriculture, green manure is created by leaving uprooted or mown crop parts to wither on a field so that they serve as a mulch and soil amendment. The plants used for green manure are often cover crops grown primarily for this purpose. Typically, they are plowed under and incorporated into the soil while green or shortly after flowering. Green manure is commonly associated with organic farming and can play an important role in sustainable annual cropping systems. So, green manure is used to maintain soil fertility. Thus, option D is correct. Biopesticides and bionutrient are from biological origin but, can not be used to improve soil fertility. Chemical fertilizers is used to maintain and improve soil fertility but, they are not of biological origin. Thus, other options are wrong.
In agriculture, green manure is created by leaving uprooted or mown crop parts to wither on a field so that they serve as a mulch and soil amendment. The plants used for green manure are often cover crops grown primarily for this purpose. Typically, they are plowed under and incorporated into the soil while green or shortly after flowering. Green manure is commonly associated with organic farming and can play an important role in sustainable annual cropping systems. So, green manure is used to maintain soil fertility. Thus, option D is correct. Biopesticides and bionutrient are from biological origin but, can not be used to improve soil fertility. Chemical fertilizers is used to maintain and improve soil fertility but, they are not of biological origin. Thus, other options are wrong.
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