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SUMMARY

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eturn to table of

eturn to table of contents Silks along the ear grow at different rates. Silks grow very rapidly for a short time and then begin to slow down in rate of growth. (Field at 50% silk.) Under these environmental conditions, maximum silk growth was ~1.6 in/day. Silk growth is slower under drier conditions. All silks are visible and rapidly growing. Pollination of the entire ear can be completed in one day. All silks are visible and growing. This is the second of two days in which the entire ear was pollinated. Silks toward the base of the ear are growing much more slowly and losing receptivity. Kernel set is poor at the base of the ear. Under these environmental conditions, silks remained viable for five to six days. The first silks to emerge are the first silks to lose pollen receptivity. 20

eturn to table of contents Silk growth slows while cob growth increases substantially. The ear produces more kernels at the tip to compensate for fewer kernels at the base. Silks along the entire ear remain receptive to pollen for five to six days. The sequence in loss of silk receptivity follows the sequence of silk emergence. As silk growth slows, the developing ear converts more energy into cob growth to provide space, water, and nutrients for developing kernels. CUMULATIVE GROWTH DURING POLLINATION Length (inches) 10 9 8 7 6 5 4 3 2 1 0 Cumulative Silk Growth During Pollination Field is 50% Silk on Day 4 Position 5 Position 15 Position 25 Position 35 Kernel Position from Base of Ear Day 12 Day 11 Day 10 Day 9 Day 8 Day 7 Day 6 Day 5 Day 4 Day 3 Day 2 Day 1 • Silks continue to grow until either the developing ovule to which the silk is attached is fertilized or until the silk completes its life cycle. • Total silk growth approaches approximately nine inches past the tip of the husk. Volume (cubic inches) Cumulative Growth in Cob Volume During Pollination 3.5 Field is 50% Silk on Day 4 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Position 1-10 Position 11-20 Position 21-30 Position 31-40 Cob Segment from Base of Ear Day 12 Day 11 Day 10 Day 9 Day 8 Day 7 Day 6 Day 5 Day 4 Day 3 Day 2 Day 1 21

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