Nutrient functions and deficiency symptoms

in Keycheck5 Nutrient Management

Palaycheck - Nutrient Management

Nitrogen (N)

Promotes rapid growth (plant height and tiller number) and increased leaf size, spikelet number per panicle, percentage filled spikelets in each panicle, and grain protein content

N deficiency occurs at critical growth stages: tillering and panicle initiation

Deficiency symptoms
plants are stunted and yellowish
reduced tiller number
small, narrow; erect leaves turn yellowish-red and brown
old leaves become light straw-colored that later wither

Phosphorus (P)

  • Promotes tillering, root development, early flowering, and ripening (especially when temperature is low)
  • Particularly important in early growth stages
  • P deficiency is often associated with other nutrient disorders such as iron toxicity and low pH

Deficiency symptoms

  • stunted with greatly reduced tiller number, erect stem and leaves
  • young leaves are normal; old leaves turn brown and die
  • number of leaves, panicles, and grains per panicle is also reduced
  • leaves appear pale green when P and N deficiencies occur simultaneously

Potassium (K)

  • Delays leaf senescence, and therefore contributes to greater canopy photosynthesis and crop growth
  • Improves root growth and plant vigor and helps prevent lodging
  • enhances crop resistance to pests and increases number of spikelets per panicle, percentage filled grains, and 1,000-grain weight
  • K deficiency symptoms appear during the later growth stages of the plant

Deficiency symptoms

  • stunted, slightly reduced tillering
  • upper leaves are short, droopy, and dirty dark green (discoloration gradually appears on younger leaves)
  • yellowish brown leaf margins are similar to those of tungro virus diseases
  • rusty brown spots appear on the tips of older leaves causing it to turn brown and dry up

Sulfur (S)

  • involved in chlorophyll production
  • required for protein for synthesis, plant function and structure
  • effect on yield is more pronounced when S deficiency occurs during vegetative growth

Deficiency symptoms

  • yellowing of the whole plant
  • chlorosis is more pronounced in young leaves; the tips may become necrotic
  • yellowish seedlings in seedbed
  • high seedling mortality after transplanting
  • stunted growth (plants are not dark-colored as in P or K deficiency)
  • reduced tiller number, fewer and shorter panicles
  • reduced number of spikelets per panicle
  • delayed maturity

Zinc (Zn)

  • essential element in chlorophyll production in the rice plant
  • Zn deficiency is the most wide-spread micronutrient-related problem in rice
  • Symptoms appear from two to four weeks after transplanting
  • Rice plants can recover from symptoms soon after the field is drained

Deficiency symptoms

  • dusty brown spots on old leaves
  • stunted plant growth
  • patches of poorly established hills in the field

Severe Zn deficiency

  • decreases or stops tillering
  • increases time to crop maturity
  • increases spikelet sterility

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