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Maize crop disorders A Lecture by Mr Allah Dad Khan

Maize crop disorders A Lecture by Mr Allah Dad Khan

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Maize crop disorders A Lecture by Mr Allah Dad Khan

  1. 1. Nutrient Deficiency and Physiological Disorders in Maize By Mr. Allah Dad Khan
  2. 2. Nitrogen deficiency Symptoms • Pale green plants; chlorosis or necrosis advance from the leaf tip along the midrib
  3. 3. Nitrogen deficiency
  4. 4. Nitrogen deficiency
  5. 5. Phosphorus deficiency Symptoms • Dark green plants; dark yellow chlorosis advancing alon#DDFFDDpurple color
  6. 6. Phosphorus deficiency Severe phosphorus deficiency in corn plants.
  7. 7. Phosphorus deficiency
  8. 8. Potassium deficiency Symptoms • Dark green plants with chlorosis along the leaf margins developing to brown striping and necrosis
  9. 9. Potassium deficiency
  10. 10. Potassium deficiency
  11. 11. Potassium deficiency
  12. 12. Potassium deficiency
  13. 13. Potassium deficiency
  14. 14. Potassium deficiency
  15. 15. Potassium deficiency
  16. 16. Potassium deficiency
  17. 17. Calcium Deficiency Symptoms • Calcium (Ca) is used by plants to form sturdy cell walls and functions in N uptake, for proper enzyme activities, and for flowering and reproduction. Soil Calcium has a rôle in buffering pH to ensure other nutrients, especially trace elements, are to the plant in a “balanced diet”. It plays a major role in improving soil structure and drainag
  18. 18. Magnesium deficiency Symptoms • Green-yellow plants with dark yellow interveinal chlorosis advancing to rust- brown necrosis
  19. 19. Magnesium deficiency
  20. 20. Magnesium
  21. 21. Copper Deficiency Symptoms • Copper (Cu) and Boron (B). These have vital roles in plant growth and function, and can become deficient in soil due to pH problems, or to mere depletion by growing crop after crop without soil testing. Soil and plant tissue testing are vitally important for these trace elements because they are normally present in such small amounts in the soil, problems can arise quickly during rapidly growing crops such as corn.
  22. 22. Copper Deficiency
  23. 23. Iron deficiency Symptoms • Symptoms are prominent interveinal chlorosis or necrosis; veins are prominent over length of leaf
  24. 24. Manganese Deficiency
  25. 25. Sulfur deficiency Symptoms • Pale yellow plants; uniformly yellow leaves without necrosis
  26. 26. Sulfur deficiency
  27. 27. Sulfur deficiency
  28. 28. Sulfur deficiency
  29. 29. Sulfur deficiency
  30. 30. Zinc deficiency Symptoms • Pale green plants; white to pale yellow bands in the lower half of the leaf which advance to pale brown or gray necrosis
  31. 31. Zinc deficiency Symptoms
  32. 32. Zinc deficiency Symptoms
  33. 33. Zinc deficiency Symptoms
  34. 34. Zinc deficiency
  35. 35. Zinc deficiency
  36. 36. Boron Deficiency
  37. 37. Boron Deficiency
  38. 38. Drought damage to corn plants. Symptoms • Weather is also a determining factor. Too much, or more commonly lately, too little rain can reduce growth and nutrient uptake, exposing the plants to greater disease and insect pressures. Drought has taken a terrible toll on corn crops in the past few of years. Maintaining good nutrition will help minimize losses due to drought, but water is always the most crucial factor. Plant water uptake is the main path by which nutrients are taken up, if water is in deficit, or if it is of low quality, i.e. salty irrigation water, nutrient uptake will be affected, causing several related nutrient and soil problem
  39. 39. Nitrogen fertilizer burn seen in corn plant. Symptoms • Water shortage can also lead to fertilizer burn when fertilizer salts cannot be dispersed sufficiently and moved away from plants roots. This concentrates the fertilizer salts around the roots and results in burning.

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