FERTILITY STATUS OF SOILS -STATE LEVEL STATUS
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
STATE
DISTRICT
SOIL REACTION (pH)
- Majority of soils (74 %) are strongly acid to slightly acid with overall pH ranging from 5.1 to 6.5 (pH class 4 to 6).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 36 and medium in 49 per cent of soil samples
- Available phosphorus is high in 53 per cent of samples
- Available potassium is low in 32 and medium in 38 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 73 per cent of samples
- Magnesium is deficient in 98 per cent of samples
- Sulphur is adequate in 96 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 82 per cent of samples
- Zinc is adequate in 86 per cent of samples
- Boron is deficient in 62 per cent of samples
SOIL REACTION (pH)
- Majority of soils (68 %) are strongly acid to slightly acid with overall pH ranging from 5.1 to 6.5 (pH class 4 to 6).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 42 and medium in 44 per cent of soil samples
- Available phosphorus is high in 74 per cent of samples
- Available potassium is low in 37 and medium in 44 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is deficient in 65 per cent of samples
- Magnesium is deficient in 98 per cent of samples
- Sulphur is deficient in 66 per cent of samples
MICRO NUTRIENT STATUS
- Copper is deficient in 52 per cent of samples
- Zinc is adequate in 78 per cent of samples
- Boron is deficient in 57 per cent of samples
SOIL REACTION (pH)
- Majority of soils (58 %) are very strongly acid to strongly acid with overall pH ranging from 4.5 to 5.5 (pH class 3 and 4).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 42 and high in 48 per cent of soil samples
- Available phosphorus is high in 65 per cent of samples
- Available potassium is medium in 39 and high in 53 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 70 per cent of samples
- Magnesium is deficient in 74 per cent of samples
- Sulphur is adequate in 76 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 87 per cent of samples
- Zinc is adequate in 90 per cent of samples
- Boron is deficient in 59 per cent of samples
SOIL REACTION (pH)
- Majority of soils (70 %) are in general extremely acid to moderately acid with overall pH ranging from 3.5 to 6.0 (pH class 2 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 47 and high in 30 per cent of soil samples
- Available phosphorus is high in 76 per cent of samples
- Available potassium is low in 48 and medium in 42 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is deficient in 79 per cent of samples
- Magnesium is deficient in 99 per cent of samples
- Sulphur is deficient in 56 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 73 per cent of samples
- Zinc is adequate in 82 per cent of samples
- Boron is deficient in 57 per cent of samples
SOIL REACTION (pH)
- Majority of soils (70 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 45 and high in 37 per cent of soil samples
- Available phosphorus is high in 71 per cent of samples
- Available potassium is medium in 36 and high in 49 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 75 per cent of samples
- Magnesium is deficient in 58 per cent of samples
- Sulphur is adequate in 85 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 94 per cent of samples
- Zinc is adequate in 95 per cent of samples
- Boron is deficient in 59 per cent of samples
SOIL REACTION (pH)
- Majority of soils (74 %) are very strongly acid to strongly acid with overall pH ranging from 4.5 to 5.5 (pH class 3 and 4).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is high in 55 per cent of soil samples
- Available phosphorus is low in 36 and high in 44 per cent of samples
- Available potassium is medium in 34 and high in 49 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 75 per cent of samples
- Magnesium is deficient in 76 per cent of samples
- Sulphur is adequate in 57 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 88 per cent of samples
- Zinc is adequate in 67 per cent of samples
- Boron is deficient in 76 per cent of samples
SOIL REACTION (pH)
- Majority of soils (62 %) are strongly acid to slightly acid with overall pH ranging from 5.1 to 6.5 (pH class 4 to 6).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 41 and high in 34 per cent of soil samples
- Available phosphorus is high in 88 per cent of samples
- Available potassium is medium in 44 and high in 41 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 78 per cent of samples
- Magnesium is adequate in 60 per cent of samples
- Sulphur is adequate in 80 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 86 per cent of samples
- Zinc is adequate in 94 per cent of samples
- Boron is deficient in 80 per cent of samples
SOIL REACTION (pH)
- Majority of soils (66 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 40 and medium in 38 per cent of soil samples
- Available phosphorus is high in 86 per cent of samples
- Available potassium is low in 38 and medium in 32 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 63 per cent of samples
- Magnesium is deficient in 88 per cent of samples
- Sulphur is adequate in 76 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 73 per cent of samples
- Zinc is adequate in 86 per cent of samples
- Boron is deficient in 80 per cent of samples
SOIL REACTION (pH)
- Majority of soils (74 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 30 and medium in 50 per cent of soil samples
- Available phosphorus is medium in 30 and high in 42 per cent of samples
- Available potassium is low in 41 and high in 35 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 68 per cent of samples
- Magnesium is deficient in 65 per cent of samples
- Sulphur is adequate in 73 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 83 per cent of samples
- Zinc is adequate in 88 per cent of samples
- Boron is deficient in 61 per cent of samples
SOIL REACTION (pH)
- Majority of soils (70 %) are strongly acid to slightly acid with overall pH ranging from 5.1 to 6.5 (pH class 4 to 6).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 40 and high in 35 per cent of soil samples
- Available phosphorus is high in 65 per cent of samples
- Available potassium is low in 42 and high in 33 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 85 per cent of samples
- Magnesium is adequate in 51 per cent of samples
- Sulphur is adequate in 76 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 95 per cent of samples
- Zinc is adequate in 92 per cent of samples
- Boron is adequate in 52 per cent of samples
SOIL REACTION (pH)
- Majority of soils (71 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is low in 41 and medium in 46 per cent of soil samples
- Available phosphorus is high in 66 per cent of samples
- Available potassium is low in 25 and medium in 47 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 59 per cent of samples
- Magnesium is deficient in 83 per cent of samples
- Sulphur is adequate in 79 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 96 per cent of samples
- Zinc is adequate in 92 per cent of samples
- Boron is adequate in 79 per cent of samples
SOIL REACTION (pH)
- Majority of soils (61 %) are extremely acid to very strongly acid with overall pH ranging from 3.5 to 5.0 (pH class 2 and 3)
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 42 and high in 43 per cent of soil samples
- Available phosphorus is high in 72 per cent of samples
- Available potassium is medium in 61 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is deficient in 70 per cent of samples
- Magnesium is deficient in 69 per cent of samples
- Sulphur is deficient in 58 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 54 per cent of samples
- Zinc is deficient in 60 per cent of samples
- Boron is deficient in 80 per cent of samples
SOIL REACTION (pH)
- Majority of soils (75 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 41 and high in 33 per cent of soil samples
- Available phosphorus is high in 72 per cent of samples
- Available potassium is low in 54 and medium in 25 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is deficient in 59 per cent of samples
- Magnesium is deficient in 77 per cent of samples
- Sulphur is adequate in 61 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 81 per cent of samples
- Zinc is adequate in 87 per cent of samples
- Boron is adequate in 56 per cent of samples
SOIL REACTION (pH)
- Majority of soils (76 %) are very strongly acid to moderately acid with overall pH ranging from 4.5 to 6.0 (pH class 3 to 5).
FERTILITY STATUS OF ORGANIC CARBON, AVAILABLE PHOSPHORUS AND POTASSIUM
- Organic carbon is medium in 31 and high in 47 per cent of soil samples
- Available phosphorus is low in 52 per cent of samples
- Available potassium is low in 32 and medium in 52 per cent of samples
SECONDARY NUTRIENT STATUS
- Calcium is adequate in 71 per cent of samples
- Magnesium is deficient in 89 per cent of samples
- Sulphur is adequate in 78 per cent of samples
MICRO NUTRIENT STATUS
- Copper is adequate in 93 per cent of samples
- Zinc is adequate in 97 per cent of samples
- Boron is deficient in 82 per cent of samples
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