railway RPF Constable Mock Test Series 2024 General Knowledge Ecology and Environment Environment Problems

कृषीमध्ये नायट्रोजनचे स्थिरीकरण करून मृदेची सुपीकता वाढविण्यासाठी काय वापरले जाते?

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कीटकनाशक
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तण
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सूक्ष्मजीव
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वनस्पती
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