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Autotroph : An organism that synthesize its required nutrients from simple
and inorganic substances.
Heterotroph : An organism that cannot synthesise its own nutrients and
depend on others.
Necrosis : Death of cells and tissues.
Biological nitrogen fixation : Conversion of atmospheric into organic com-
pounds by living organisms.
Nitrification : Conversion of ammonia (NH
) into nitrite and then to
nitrate.
3
Denitrification : A process of conversion of nitrate into nitrous oxide and
nitrogen gas (N
).
Leg-hemoglobin : Pinkish pigment found in the root nodules of legumes.
2
It acts as oxygen scavenger and protects the nitrogenase.
Flux : The movement of ions is called flux.
Necrosis : Death of tissues particularly leaf tissue due to deficiency of Ca,
Mg, Cu, K.
Mineral
Nutrition : Plants require minerall elements for their growth and
development. The utilization of various absorbed ions by a plant for growth and
development is called mineral nutrition of the plant.
Hydroponics : Soil-less culture of plants, where roots are immersed in
nutrient solution without soil is called hydroponics. The result obtained from
hydroponics may be used to determine deficiency symptoms of essential ele-
ments.
Essential Elements |
|
Macronutrients |
Micro-nutrients |
| Macronutrients are present in | Micro-nutrients are needed in very low |
| plant tissues in concentrations of 1 to 10 mg per gram of dry matter | amounts : 0.1 mg per gram of dry matter. |
| C, H, O, N, P, K, S, Ca, Mg | Fe, Mn, Cu, Mo, Zn, B, Cl, Si. |
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