Mineral Nutrition Deficiency Zones in TamilNadu
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| Possible effects of pH and soil type on nutrient availability |
| Soil type | Low pH <6.0 | Normal pH 6.0 – 7.0 | High pH >7.0 |
| Clay | Phosphorus Molybdenum | Boron Manganese Zinc | |
| Clay Loam | Phosphorus Potassium Molybdenum | Manganese | Boron Manganese Zinc |
| Loam | Phosphorus Potassium Molybdenum | Boron Manganese | Boron Copper Iron Manganese Zinc |
| Sandy Loam | Nitrogen Phosphorus Potassium Magnesium Copper Molybdenum | Nitrogen Magnesium Sulfur Boron Copper Manganese Zinc | Nitrogen Phosphorus Magnesium Sulfur Boron Copper Iron Manganese Zinc |
| Sandy soils | Nitrogen Phosphorus Potassium Magnesium Sulfur Boron Copper Molybdenum Zinc | Nitrogen Potassium Magnesium Sulfur Boron Copper Manganese Zinc | Nitrogen Phosphorus Potassium Magnesium Sulfur Boron Copper Iron Manganese Zinc |
| Organic soils – Peat | Phosphorus Copper Zinc | Copper Manganese Zinc | Boron Copper Manganese Zinc |
| Thin soil over Limestone | Magnesium | Magnesium Copper Manganese Zinc | Magnesium Copper Manganese Zinc |
Source: Growth and Mineral Nutrition of Field Crops, Third Edition. By Nand Kumar Fageria, Virupax C. Baligar, Charles Allan Jones, 2011. CRC Press, Taylor and Francis Group.
http://www.cropnutrition.com/efu-plant-analysis#diagnosis-of-nutrient-status