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Znc sulphate monohydrate
Zinc sulphate heptahydrate

Introduction

  • Zinc importance in plant nutrition is recognised after the introduction of high yielding varieties.
  • Zinc deficiency caused by intensive cropping.
  • 80% of rice land deficient in zinc.
  • After N and P zinc playing important role in rice.


Role in Plant System

  • Producing several enzymes
  • Responsible for chlorophyll formation.
  • Deficiency reduce photosynthetic activity.
  • Playing a role in N – metabolism.
  • Regulate auxin (hormone) production
  • Promotes nucleic acid production for protein synthesis.

Injury Due To Excess Fertilizer

Excess zinc cause deficiency of Iron.

Deficiency Symptoms

  • Appearance of rusty brown spots and discoloration of older leaves starting from 2-3 weeks after planting.
  • Uneven crop stand.
  • Under acute conditions margins of older leaves dry up.
  • Under acute conditions margins of older leaves dry up.
  • Tillering and growth adversely affected (KHAIRA disease)
  • Fresh leaves smaller in size.
  • No uniform maturity of crop.

Management of Zinc for Rice

Management of Zinc for Rice one

Management of Zinc for Rice two

 

  • 50 kg of Zinc Sulphate /ha to soil in the final puddling in every Rabi season in double cropped wet lands.
  • Once in 2-3 crops in single cropped areas.
  • Give a gap of 4-5 days between application of phosphorus and Zinc since Zn has antogonistic effect with phosphorus.
  • Zinc deficiency in standing crop can be corrected by spraying 0.2% zinc sulphate solution (2g/lt of water) about 500 liters of spray solution is required to cover one hectare.
  • Spraying should be repeated 2-4 times at an interval of 5-10 days.

Sources

  • Zinc sulphate – Zn SO4 7H2O (21%Zn)
  • ZnSO4 H2O (33% Zn)
  • Chelate Zinc (12% Zn) – is costly
  • Chelated Zinc (12% Zn)

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