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boll development

Defoliation
timing

We often use percentage open bolls or nodes above cracked boll to determine when to defoliate cotton. With either technique, it is a good idea to cut some of the younger bolls to ensure that the crop is mature and ready to defoliate. These bolls are first position bolls from the same plant. The youngest boll on the left was at the top of the plant and the others were one node below each other down the plant.  The bolls on the left are not mature. Defoliation of these bolls would result in reduced yields and reduced micronaire. The bolls labeled 5 and 6 are mature and defoliation would not result in reduced yields. If you youngest bolls in a field were similar to the boll labeled number 4 you would probably not reduce yields by defoliating the field. Notice that the more mature bolls on the have a seed coat that is turning dark and easy to distinguish. The cotyledons in the middle of the seed are firm and well-formed.

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boll development

Defoliation
timing

We often use percentage open bolls or nodes above cracked boll to determine when to defoliate cotton. With either technique, it is a good idea to cut some of the younger bolls to ensure that the crop is mature and ready to defoliate. These bolls are first position bolls from the same plant. The youngest boll on the left was at the top of the plant and the others were one node below each other down the plant.  The bolls on the left are not mature. Defoliation of these bolls would result in reduced yields and reduced micronaire. The bolls labeled 5 and 6 are mature and defoliation would not result in reduced yields. If you youngest bolls in a field were similar to the boll labeled number 4 you would probably not reduce yields by defoliating the field. Notice that the more mature bolls on the have a seed coat that is turning dark and easy to distinguish. The cotyledons in the middle of the seed are firm and well-formed.

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cotton field day postcard

2016 Cotton Field
Day

The 2016 Cotton Field day will be held September 15, 2016 at the Upper Coastal Plain Research Station. Co-Sponsors N.C. Department of Agriculture and Consumer Services N.C. Cotton Producers Association, Inc.   Field Day Schedule 11:00 am Arrival, registration, exhibits 11:30 am Lunch 12:30 Welcome Andrew Burleson, president NC Cotton Producers Association Dr. Robert Reich, Agricultural Services Assistant Commissioner             Dr. Rich Bonanno, Associate Dean, CALS and Director, North Carolina    Cooperative Extension Service Tours begin: 1:15 p.m. (second tour starts at 3:15) Weed tour: Weed Management in XtendFlex Cotton and Enlist Cotton Alan York Preemergence Herbicide Evaluation Alan York Mepiquat Chloride/Dicamba Combinations Alan York Evaluation of Cover Crops for Weed Management in Cotton Rachel Atwell Effect of 2,4-DB Applied to Peanuts Immediately Adjacent to Enlist Cotton Alan York Long-Term Management of Palmer Amaranth in Cotton David Jordan Agronomics and insect tour: Cotton input evaluation Todd Spivey & Keith Edmisten Evaluating fertilizers and amendments Carl Crozier Cotton tillage options Todd Spivey & Keith Edmisten Defoliation considerations for 2016 Keith Edmisten Thrips Management Dominic Reisig Cotton variety selection Guy Collins Demonstration at field day UAV use in cotton Gary Robertson 5:00 pm Ice cream, door prizes and departure North Carolina Cotton Field Day and Exhibition Planning Committee Keith Edmisten, Chairman, N.C. State University David Parrish, N.C. Cotton Producers Assoc., Inc. Guy Collins, NCSU Clyde Bogle, NCDA&CS Alan York, NCSU Mike Quilan, NCSU Carl Crozier, NCSU Gary Roberson, NCSU Dominic Reisig, NCSU Art Bradley, NCCES, Edgecombe County click on map above to enlarge.

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