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22
Aug
2014
Arkansas Corn and Grain Sorghum Weekly Update – August 22, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

Corn and Grain Sorghum Research Verification – Kevin Lawson (Corn & GS Verification Coordinator)

The Clay County corn verification field is the only field that hasn’t reached R6 (black Layer) yet.  The field was about 60% starch this week, and I recommended one more irrigation today then to terminate irrigation.  It is only about 200 heat units away from R6 and should be there by next Friday with the predicted temperatures.  White County grain moisture was about 22% this week, so we could see harvest next week depending on the rain.

A hand grain sample of the Prairie County grain sorghum verification field was at 18% moisture.  Due to rice surrounding the field we can’t use glyphosate so we have decided to use sodium chlorate as a harvest aid.  We will wait until next Tuesday and see what the rain forecast is and make a decision on when to apply.  The Chicot County grain sorghum field should be harvested in the next few days.

Average CRVP Growth and Development vs. 2014 CRVP.

 Corn Stages

5 Year Avg CRVP Days to Stages 2014 Avg CRVP Days to Stages 5 Year Avg CRVP Height (in) 2014 Avg CRVP Height (in) Avg CRVP Heat Units (2012 – 2013)

Avg CRVP Heat Units 2014

Planting

0

0 0 0

VE

10

10 0 0 145

177

V2

18

17 3 2 251

324

V4

28

26 6 5 425

506

V6

37

36 12 12 612

792

V8

45

43 22 19 791

1025

V10

51

48 36 34 922

1167

V12

56

53 52 49 1036

1302

V14

61

58 67 61 1155

1407

V16

65

63 82 73 1256

1500

R1

72

70 106 102 1452

1581

R2

78

76 115 112 1615

1716

R3

84

82 115 112 1811

1868

R4

91

89 115 112 2005

2038

R5

98

96 115 112 2199

2227

R6

122

122 115 112 2919

2862

Harvest

145

  115 112

 

Southeast Arkansas Update – Wes Kirkpatrick (Desha County) & Kevin Norton (Ashley County)

Rains this past week have halted corn harvest for the moment.  Yields are ranging from about 190 to 250 bushels per acre. Over the next week harvest should be in full swing, depending on the weather.  Grain sorghum fields have been sprayed twice for sugarcane aphid.

Central Arkansas Update – Brent Griffin (Prairie County)

A few Prairie County growers with batch driers began harvest over the past weekend around scattered rainfall. Moisture levels were from 21 to 25%. Yield information is sparse at this time, but conversation with those who did begin picking was fair to good. Sorghum is being sprayed for sugarcane aphid.  The populations have exploded over the past 7 days on sorghum within 10 to 14 days of harvest.

Northeast Arkansas Update – Herb Ginn (Lawrence County) & Branon Thiesse (Craighead County)

Craighead County – Irrigations have been terminated on all fields. Hot temperatures will assist the crop in drying down and we should have some samples cut in the next few days. Grain sorghum continues to turn color with a few late fields receiving irrigations. These fields are being scouted for head worms. Early fields could have a harvest aid applied as early as next week.

Lawrence County – Some corn is being harvested now in the county and I expect more fields will have combines in them by next week.  I have not been able to get any corn yield numbers yet from growers.  After attending our field day recently and listening to Dr. Gus Lorenz talk about the problem we are having with sugarcane aphids in the state, one of our growers went back to his farm and starting checking his fields for this pest.  The grower called me and asked me to come out and confirm what he thought was the sugarcane aphid, unfortunately he was correct as his grain sorghum field did indeed have sugarcane aphids, so we now have this pest in Lawrence County- what a week!

River Valley Update – Kevin VanPelt (Conway County) & Hank Chaney (Faulkner County)

Faulkner County – The early planted corn is mature and most producers are letting it dry in the field because they don’t have batch driers.  Jury is still out on the dryland corn and grain sorghum.  Scattered rainfall over the past week coupled with increased heat could impact late seeded dryland corn and grain sorghum.  Sugarcane aphid is still a problem with several grain sorghum fields having to be treated although it appears Transform is doing an excellent job in controlling this pest.  As the temperature has increased, Southern rust has been observed in some very late planted corn silage and a corn maze field. Hopefully, harvest will begin next week.

Conway County – Producers finished watering the last of the later planted corn this week and by the end of the week started harvesting some of the earlier planted corn with moisture running from 18% to 20%. By next week the earlier planted corn harvest will be underway in the River Valley, but some producers are still a week or two away.

Heat Units

Heat units really jumped up this week.  It wasn’t really the hot high temperatures that led to the increase in heat units as much as the higher night time temperatures.

 Region of the state (city)

Heat Units Accumulated Aug 16 – Aug 22

30 Year Average Heat Units Aug 16 – Aug 22

Southeast Arkansas (McGehee, AR)

204

196

Central Arkansas (Des Arc, AR)

199

200

Northeast Arkansas (Jonesboro, AR)

207

190

River Valley (Morrilton, AR)

201

185

 

Follow me on Twitter – Kevin Lawson @ar_cornverify


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