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21. What does 15–15–15, 17–18–19 etc. signify on fertilizer bags ?

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22. Name the best known symbiotic nitrogen fixing bacterium.

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23. Name the mineral which has toxic effect on plant and inhibits calcium translocation in shoot apex.

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24. What is aeroponics ?

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25. Name the mineral essential for carbohydrate translocation and cell differentiation.

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26. What is the effect of deficiency of silicon on cereals ?

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Potassium.

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28. Name the element which is used in the synthesis of cell wall and the formation of mitotic spindle.

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29. Name the most active nitrogen fixer which is found in rice fields.

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30. What is plant ash ?

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