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51. Name two Macro and micro nutrients

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52. What is the importance of boron in plant life ?

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53. Name the essential elements :

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54. Write the deficiency symptoms of :

(1) iron (2) zinc and calcium.

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Macronutrients : are present in amount more than 10m mole kg.^–1 of dry mattter.

Micronutrients : These are present in amount less than 10m mole kg^-1.

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56. Describe the natural method of nitrogen fixation.

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57. Which mineral competes with Fe and Mg?

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58. Comment upon ammonification.

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59. Which element is involved in the splitting of water to liberate oxygen during photosynthesis?

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60. The toxicity of which mineral are deficiency symptoms of Ca, Mg and Fe ?

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