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🔬 Science - Class 9
Unit 19 · Materials used in Agriculture

Nutrients Plants Need Presentation

ScienceSubject
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Science and Technology, Class 9

Nutrients Plants Need

17 essential elements · Primary and secondary · From soil to crop

Today's Objectives

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Explain why materials must be added to soil

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Recognise the 17 essential elements

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Separate primary and secondary nutrients

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State why soil testing matters

The Story of Harkabahadur's Field

1
He planted improved maize seed, but it sprouted poorly
2
Plants grew unevenly by patch, with weak roots and yellow leaves
3
Urea made plants shoot up in some patches only
4
A soil test showed each patch lacked different elements
5
Matching fertilizer, lime and pesticide to each patch saved the crop

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Presenter notes: Today we learn which elements a plant needs and what happens when the soil runs short of them, starting from a farmer's experience that could happen in any village.