Foliar Fertlizers and Nutrient Diagnosis in Cotton Crop

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Foliar Fertlizers and Nutrient Diagnosis in Cotton Crop

  1. 1. Micronutrients & Its benefits<br />Syed Saeed Ur Rehman Shah<br />Rgional Business Manager<br />Farmers Equity Pakistan Pvt. Ltd.<br />
  2. 2. Essential Plant Nutrients<br />Macronutrients<br />Required in relatively large amounts.<br />Micronutrients<br />Required in small amounts.<br />Minor or trace elements.<br />
  3. 3. Macronutrients<br />Fall into one of three categories:<br />Non-Mineral Elements<br />Primary Nutrients<br />Secondary Nutrients<br />
  4. 4. Non-Mineral Elements<br />(C) Carbon<br />(H) Hydrogen<br />(O) Oxygen<br />
  5. 5. Primary Nutrients<br />(N) Nitrogen<br />(P) Phosphorus<br />(K) Potassium<br />
  6. 6. Secondary Nutrients<br />(Ca) Calcium<br />(Mg) Magnesium<br />(S) Sulfur<br />
  7. 7. Macronutrients<br />Macronutrients are needed in relatively large amounts by plants. <br />
  8. 8. Micronutrients<br />(Fe) Iron<br />(Cu) Copper<br />(Zn) Zinc<br />(B) Boron<br />(Mo) Molybdenum<br />(Mn) Manganese<br />(Cl) Chlorine<br />
  9. 9. Micronutrients<br />Macronutrients are needed in relatively small amounts by plants. <br />They are usually supplied by fertilizers.<br />
  10. 10. Why foliar nutrition Now !<br />
  11. 11. Function & Deficiency Symptoms of Nutrients<br />
  12. 12. Several factors can affect occurrence of deficiency symptoms<br /><ul><li>Soil test level </li></ul> also consider texture, CEC, OM, pH, etc.<br /><ul><li>Soil conditions, e.g., </li></ul> temperature<br /> compaction<br /> moisture<br /> Salinity<br /><ul><li>Tillage practices</li></ul>Root pruning<br /><ul><li>Nutrient interactions</li></ul>P-Zn<br /><ul><li>Herbicide, disease, or insect damage</li></li></ul><li>
  13. 13. Nutrient Mobility in the Plant<br />Translocated<br /><ul><li>Symptoms appear in older leaves first</li></ul>nitrogen<br />phosphorous<br />potassium<br />Magnesium<br />Not translocated<br /><ul><li>Symptoms appear in younger leaves</li></ul>first<br />sulfur<br />calcium<br />boron, iron, manganese, zinc, copper, molybdenum, chloride<br />
  14. 14. What are the Primary Nutrientsneeded by all crops<br />
  15. 15. Secondary Nutrients Neededby all Crops<br />
  16. 16. What are the Primary Nutrientsneeded by all crops<br />
  17. 17. Micronutrients Needed by all Crops<br />
  18. 18. Cotton<br />
  19. 19. Make a Preliminary Diagnosis<br />• Discoloration<br />• Nutrient deficiencies<br />• Diseases<br />• Herbicide or salt injury<br />
  20. 20.
  21. 21. N management of cotton<br /><ul><li>Uptake may reach 1-2 Kg/A/day during mid boll fill
  22. 22. Approximately 20% of seasonal needs should be supplied pre-bloom
  23. 23. Supply remainder of N should be supplied during boll development period
  24. 24. Soil N should be depleted as bolls begin to open to avoid delayed maturity</li></li></ul><li>N deficient cotton<br /><ul><li>Early and mid season</li></ul>Yellowish-green leaf color and small young leaves<br />Stunted plants<br />Shortened fruiting branches<br />Many bolls shed in the first 10-12 days after flowering<br /><ul><li>Late season</li></ul>Reddening in the middle of the canopy<br />Reduced boll retention at late fruiting positions<br />Shorter flowering period, accelerated leaf senescence, and early cut-out<br />
  25. 25.
  26. 26. Functions of Phosphorus in Cotton Production<br />Promotes early boll development and hastens maturity<br />Essential for vigorous root and shoot growth<br />Helps overcome the effects of compaction<br />Increases water use efficiency<br />A 2 bale crop can take up more than 50 lb P2O5/A<br />
  27. 27. P deficient cotton Symptoms are not distinct in cotton,<br />Stunting<br />Dark leaves<br />Flowering delayed<br />Poor boll retention<br />Premature leaf senescence<br />
  28. 28. Potassium in Cotton Production<br />Bolls are major sinks for K, uptake may peak at as much as 1-2 Kg K2O/A/day during boll development.<br />About 70% of total uptake occurs after first bloom.<br />Affects quality (micronaire, length, and strength)<br />Increases water use efficiency <br />Reduces the incidence and severity of wilt diseases<br />A 2 bale crop will take-up about 80Kg K2O<br />
  29. 29. Potassium deficient cotton<br />Potassium deficient cotton<br />Affects older leaves first in early season<br /><ul><li>Begins as scorching of leaf margin
  30. 30. Affects both yield and quality</li></ul>Late season affects younger leaves<br />
  31. 31. Foliar K on Cotton<br /><ul><li>Response to mid-season foliar K is likely when soil K is low (low soil test level or fixation)
  32. 32. Applications at 2 week intervals should begin at or soon after 1st flower 2 Kg K2O/A per application</li></li></ul><li>Sulfur deficient cotton<br />Symptoms similar to N but occur on younger leaves in upper canopy first<br />Leaf veins tend to remain green<br />
  33. 33. Micronutrient Deficiency Symptoms<br />• Interveinal chlorosis in younger<br />leaves<br />• Zn deficiency can result in leathery,<br />upturned leaves and bronzing<br />
  34. 34. Zinc Deficiency in Cotton <br />
  35. 35. Boron<br />Deficiency Symptoms<br />Short, thick stems tips.<br />Young leaves of terminal buds are light green at base.<br />Leaves become twisted & die.<br />
  36. 36.
  37. 37. THANK YOU<br />
  38. 38. Questions ?<br />Ca, Mg, S, Fe, Mn<br />Cu, Zn, B, Mo, I<br />N<br />P<br />K<br />

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