Resource Book on Horticulture Nursery Management

ii. As constituent of enzyme systems which bring about oxidation reduction reaction
in the plant, it regulates respiration, photosynthesis, reduction of nitrates and
sulphates and is essential for the synthesis of proteins contained in the
chloroplasts.
10. Zinc
i. Zinc is a constituent of several enzyme systems which regulate various metabolic
reactions in the plant. E.g. formation of chlorophyll in plants.
ii. It influences the formation of some growth hormones in the plant and is
associated with water uptake and water relations in the plant.
11. Molybdenum
i. Acts in enzyme system which brings about oxidation reduction reactions,
especially the reduction of nitrates to ammonia prior to amino acid and protein
synthesis in the cells of the plant.
ii. Is essential for the process of atmospheric nitrogen fixation, both symbiotic and
non symbiotic. It increases efficiency of legumes in fixing atmospheric nitrogen.
12. Copper
i. Copper forms many compounds with amino acids and proteins in the plant.
ii. It acts as electron carrier in enzymes which bring about oxidation reduction
reaction in plants. It also helps in utilization of iron in chlorophyll synthesis.
13. Chlorine
The need for chlorine for proper plant growth and development has been established
for sugar beet, carrot, lettuce. However, the exact role which chlorine plays in plant
nutrition has not yet been clearly defined.
14. Nickel
It is essential for hydrogenase, methyl reductase, and ureas activities that regulate
Nitrogen metabolism. It is needed for grain filling and seed vitality.
Fertilizers Supplying Various Plant Nutrients
1. Nitrogenous Fertilizers:
Sr. No. Name of fertilizer N %
1. Ammonium sulphate 20.6
2. Urea 46
3. Urea coated 45
4. Calcium ammonium nitrate 25
5. Urea ammonium nitrate 32
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