Plant Nutrition

Zinc Nutrient Info

Zinc - Quick Facts

  • Zinc activates or is a component of several enzymes and therefore affects many metabolic processes in the plant.
  • As a component of enzymes, zinc catalyzes the synthesis of fructose-6-phosphate, an important metabolite in glycolysis and therefore photosynthesis.
  • Affects the indole-3-acidic acid content which is important for regulation of plant growth.
  • Zinc plays an essential role in ATP and protein synthesis.
  • Zinc is an essential component of RNA polymerase which catalyzes RNA synthesis, which in turn affects production of proteins.
  • Form used by plant: Zn+2

Zinc - Role of Nutrient

  • Aids plant growth hormones and enzyme systems.
  • Helps in seed formation.
  • Necessary for protein synthesis and membrane function.
  • Influences plant hormone proteins, for example auxin development, especially IAA.
  • Active in chlorophyll synthesis & manufacturing of carbohydrates.
  • Zinc causes healthy root growth, leading to enhanced grain yield

Zinc - Nutrient in Soil

  • Excess Zn encourages iron deficiency and reduces manganese absorption.

Zinc - Deficiency Symptons

  • Leaves are smaller and narrower than normal (“little leaf”), and their tips are often white. The entire plant is often stunted (dwarfism)
  • Malformation of foliage and reduced fruit set
  • Yellow or chlorotic striping
  • Older and middle leaves display chlorotic spots with necrotic areas
  • Shortened internode
  • In fruit crops, ‘rosette’ or ‘little leaf’ development occurs because of jammed internodes
  • The growth of sprigs is inhibited and young shoots die
  • Premature leaf senescence can also occur
  • Leaf roll in potatoes

Zinc - Factors Affecting Deficiency

  • Low organic matter soils, high pH soils, light and sandy soils.
  • The pH and the total Zinc content of the soil.
  • Excessive sulphate and phosphate content in the soil solution will result in immobilization of zinc.
  • Under anaerobic conditions, zinc can be precipitated into the barely soluble sulphide form which is largely unavailable to plants.
  • Conditions in which restrict root development such as compacted and cold wet soils, will negatively affect Zinc availability.
  • High available P can accentuate Zn deficiencies as well as high N fertilization and very high potassium levels may also induce Zn deficiency.

R3 Agronomic Platform

R3 Lifecycle: Roots > Reproduce > Ripen

Roots – The vegetative stage looks to develop vigorous, healthy roots to maximize nutrient acquisition from the soil. The end result is a healthy root rhizosphere.

Reproduce – Supply the essential nutrients at reproduction to help the plant maximize pollen viability, flowering, pollination, seed set and fruit development.

Ripen – Late season nutrition is vital to optimize the nutrient density and quality of the crop.

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