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Mineral Nutrition

Long Answer Type

61. Give a brief account about soil fertility and its depletion.

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Short Answer Type

62. What are protoplasmic elements ?

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63. Give the significance of culture experiment.

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64. Give the term for-
The concentration of the essential element below which plants growth is retarded

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65. Deficiency of which elements cause delay in flowering?

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66. Why is there a need for application of fertilisers ?

Fertilisers are chemical compounds used to replenish minerals in crop fields. Three important elements need to be replenished in crop field as they are used up by repeated cultivation of the land. Fertiliser provide these elements like nitrogen, phophorous and potassium . The NPK fertilisers comprise nitrophoshate with potash in varying proportions. The dosage varies according to the crop, soil, season and other climatic conditions. They increase the nutrient content of the soil.

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67. Name the elements which are not essential for plants but are essential for animals.

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68. Nitrogen is an essential element for plants and is found in abundance as atmospheric nitrogen. But most plants are unable to use it. Why is it so and in what form do plants utilise nitrogen?

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69. Who developed hydroponics ?

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70. Name the element which is mineral and non-mineral.

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