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Corn growth & development

Corn growth & development. Growth Stages of Corn. Corn Growth Stages & Development. Typical corn plants develop 20 to 21 total leaves silk about 65 days after emergence mature around 125 days after emergence. VE - Emergence. V1 - First leaf collar. V3 - Third leaf collar. V5 & V6.

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Corn growth & development

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  1. Corn growth & development

  2. Growth Stages of Corn

  3. Corn Growth Stages & Development • Typical corn plants develop 20 to 21 total leaves • silk about 65 days after emergence • mature around 125 days after emergence

  4. VE - Emergence

  5. V1 - First leaf collar

  6. V3 - Third leaf collar

  7. V5 & V6 V5: At this stage the uppermost ear and tassel is initiated followed by kernel row number determination. The growing point nears the soil surface as stalk internode elongation begins. V6: The tassel/growing point is now above the soil surface making plants increasingly vulnerable to above-ground damage. Ear shoot initiation has begun.

  8. V7 - Seven leaf collar

  9. V10 - Ten leaf collar

  10. VT - Tasseling

  11. R1 - Silking

  12. R6 - Physiological Maturity

  13. Stages in Kernel Development

  14. Silking Stage (R1) • Emergence of silk • Every ovule (potential kernel) on the ear develops its own silk (the functional stigma of the female flower) • Silks remain receptive to pollen grain germination up to 10 days after silk emergence

  15. Kernel Blister Stage (R2) • About 10 to 14 days after silking, the developing kernels are whitish "blisters" on the cob and contain abundant clear fluid

  16. Kernel “Milk Stage” (R3) • About 18 to 22 days after silking, the kernels are mostly yellow and contain "milky" white fluid

  17. Kernel “Dough Stage” (R4) • About 24 to 28 days after silking, the kernel's milky inner fluid is changing to a "doughy" consistency as starch accumulation continues in the endosperm. • The shelled cob is now light red or pink

  18. Kernel “Dent Stage” (R5) • About 35 to 42 days after silking, all or nearly all of the kernels are denting near their crowns. • Kernel moisture content at the beginning of the dent stage is approximately 55 percent. • A distinct horizontal line appears near the dent end This line is called the "milk line" and marks the boundary between the liquid (milky) and solid (starchy) areas of the maturing kernels.

  19. Harvesting As a guideline Sweet corn; 21 days after silking. Also known as ‘milk stage’ . About 70 days after planting.

  20. Harvesting As a guideline grain corn; 115- 125 days after planting. Stalk and husks on ear are dry and turn brown.

  21. Thank you

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