FERTILITY STATUS OF SOILS -STATE LEVEL PROJECTION


Under the project on ‘Soil based plant nutrient management plan for agro-ecosystems of Kerala’ around 2.0 lakhs soil samples were collected from all the local bodies of the State and analyzed for soil reaction, electrical conductivity, major, secondary and micro nutrients. The soil test values were processed and interpreted to project the soil fertility status of the State. Soil fertility investigation has brought to fore the following constraints:

Soil acidification

  • Soil acidification has reached alarming proportions impairing the productivity of most of the crops
  • Eighty eight per cent of the soil samples are acidic, with 69 % very strongly acid to moderately acid (4.5 to 6.0) requiring regular lime application

Major nutrients

  • Organic carbon status is low to medium in 71 per cent of soil samples
  • Available phosphorus is high in 68 per cent of soil samples
  • Available potassium is low to medium in 69 per cent of soil samples

Secondary nutrients

  • Calcium is deficient in 36 per cent of soil samples
  • Magnesium deficiency is severe and wide spread and observed in 71 per cent of samples
  • Deficiency of sulphur is recorded in 30 per cent of soil samples

Micro nutrients

  • Copper is deficient in 17 per cent of soil samples
  • Zinc is deficient in 14 per cent of soil samples
  • Boron deficiency is severe and recorded in 60 per cent of samples

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