Fertilizers & manures in Crop Production & management | Middle School Science | Khan Academy

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Discover the key differences between fertilizers, manures, and the sustainable practice of crop rotation! Fertilizers are factory-made chemicals that provide a quick nutrient boost to plants, while manures are natural, organic materials that improve soil health over time. But did you know there’s a more environmentally friendly and sustainable option?

Enter crop rotation! Learn how planting crops like green peas, which host nitrogen-fixing rhizobium bacteria, naturally enriches the soil for the next crop—like cabbage—without needing fertilizers or manure.

Key Takeaways:
Fertilizers provide nutrients like NPK but don’t add humus.
Manures improve soil health by adding humus and organic matter.
Crop rotation is the ultimate sustainable farming practice that replenishes soil nutrients naturally.

Timestamps:
0:00 What if Soil runs out of Nutrients?
0:00 What is Healthy Soil?
01:15 Fertilzers
02:51 Manures
04:16 Humus
05:30 Crop Rotation
07:10 Summary

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Created by
Shankar R