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A great video lecture conducted by experienced biology teacher on 9th class biology chapter 8 topic1 importance of fertilizers. Get full understanding or ask any questions.

Importance of Fertilizers, ch 8, lec 4, Importance of Fertilizers - 9th Class Biology

4:06

Environmental Hazards Related to Fertilizers Use, ch 8, lec 4, Importance of Fertilizers - 9th Class Biology

4:36