Methods of fertilizer application

Agronomy JRF

Methods of fertilizer application:

a. Basal dose:

• Application of fertilizer/pesticides at the time of sowing

■ Phosphorus fertilizers applied at basal dose due to their slow release nature.

b. Deep placement of fertilizer:

■ In paddy only ammonium form (NI -14+ ) incorporated in reduced zone to prevent leaching and volatilization losses.

c. Starter dose:

• In legume and vegetable seedling at transplanting applied NPK at 1:2:1 ratio.

d. Split doses of N fertilizer:

• To increase N efficiency, applied 2 split doses in most of cereals having crop duration 45 months.

• Applied 3 split doses for crop having duration more than five months.

Suitability of fertilizers:

  •  Potassium sulphate is used where quality of crop is required because KCL reduce the quality of crops.
  •  For rice crop: ammonium sulphate is the best.
  •  In acidic soils: Rock phosphate and SSP is used instead DAP:
  • In saline & alkali soils ammonical fertilizers are not recommended because alkalization of ammonia takes place
  • Indian soils are universal deficient in Nitrogen and Zinc.
  • Fertilizer grade indicate the percentage of plant nutrients in a fertilizer.
  • Fertilizer ratio is the relative proportion of three major (NPK) plant nutrients.
  • In water logged soils ammonium sulphate is best suitable N fertilizer.

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