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25
Jul
2014
Arkansas Corn and Grain Sorghum Weekly Update – July 25, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

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

Corn fields continue the race to irrigation termination.  The Arkansas and White County fields need one more irrigation or rainfall before irrigation termination.  Lonoke, Lee and St Francis Counties need irrigated one more time or maybe two, depending on how it has progressed by next week.  Southern rust still hasn’t shown up much and no foliar fungicides have been applied.

The Chicot County grain sorghum field is near maturity and irrigation has been terminated.  Transform insecticide did an excellent job controlling sugarcane aphids.   We will check for headworms one last time next week.   A few headworms were found in the Prairie County field, but were below treatment threshold and we are going check again next week.

County

Hybrid Growth Stage Weekly Rain

Comments

———-Corn———-

Arkansas DKC64-69 VT3P

R5.5

2.00

Recommended irrigation on July 26, and then terminate irrigation. (Scouted July 24)
Clay DKC64-83 VT3P

R3

0.00

Irrigated on July 20.  Recommended irrigation on July 27. (Scouted July 22)
Jefferson DKC62-08 SS

R5

0.85

Recommended irrigation on July 22.  (Scouted July 21)
Lee DKC66-87 VT2P

R5.3

0.60

Recommended irrigation on July 28. (Scouted July 24)
Lonoke Armor 1330

R5.3

1.10

Irrigated on July 22.  Recommended irrigation on July 29. (Scouted July 24)
Mississippi Pioneer 2089YHR

R5

0.15

Irrigated on July 21.  Recommended irrigation on July 28. (Scouted July 22)
St Francis Terral 26BHR50

R5.3

0.60

Irrigated on July 22.  Recommended irrigation on July 28. (Scouted July 22)
White Armor 1550PRO

R5.5

0.65

Recommended irrigation on July 28, and then terminate irrigation. (Scouted July 25)

———–Grain Sorghum———-

Chicot Dyna-Gro 765B

Hard Dough

2.50

Applied 1.5 oz of Transform on July 14.  Recommended to terminate irrigation. (Scouted July 21)
Prairie Pioneer 84P80

Soft Dough

0.80

Found a few small earworms.  Will scout again next week to determine if they need to be controlled.  (Scouted July 24)

 

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

150

V2

18

17 3 2 251

266

V4

28

26 6 5 425

463

V6

37

36 12 12 612

633

V8

45

43 22 19 791

798

V10

51

48 36 34 922

938

V12

56

53 52 49 1036

1078

V14

61

58 67 61 1155

1197

V16

65

63 82 73 1256

1308

R1

72

70 106 102 1452

1519

R2

78

76 115 112 1615

1683

R3

84

82 115 112 1811

1842

R4

91

89 115 112 2005

2017

R5

98

97 115 112 2199

2195

R6

122

  115 112 2919

 

Harvest

145

  115 112

 

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

Because of the rain late last week, we have completed irrigation on some acres. Most of the other acres are getting close to being finished with only 1-2 more irrigations needed unless we get more rainfall.

Central Arkansas Update – Brent Griffin (Prairie County)

Prairie County received .25 to 1.5 inches of rain this week which will help with irrigation of corn and sorghum.  Dryland sorghum is reaching the point where good yields are within sight. Headworm pressure continues to pick up in the sorghum with some treatments being made for corn earworms (4 to 6 per head 3/4″ long). Corn has reached dent stage with 50% starch layer common. No southern corn rust yet but some ear rots starting to show (diplodia ear rot).

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

Craighead County – More corn fields are heading toward dent. Some fields may be able to terminate irrigation in a couple of weeks. We received from 0.25 to 0.75 inch of rain, with some locally heavier amounts from the storm system moving through on July 23. Winds clocked at about 60 mph caused more green snap in fields that had already had damage from the June 5 storm. There were more downed trees and power outages throughout the county with some reported minor damage to farm shops (mainly to tin roofs).

Lawrence County – Last night (July 23) we had some strong storms come through with high winds. We received close to 1 inch of rain in places around the county. Some early planted corn is very close to black layer, while later planted corn is a little ways off. Grain sorghum continues to progress with some fields being sprayed for stink bugs.

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

Southern rust was found in the River Valley with some fields being sprayed.  Rain this week will probably terminate irrigation on early seeded fields.

Heat Units

This was another week with heat units trailing behind the 30 year average.  A hybrid that is around 114 day takes approximately 2850 heat units to reach R6 (black layer).  If you look at Southeast Arkansas, according to the 30 year averages, a hybrid planted on March 9 should be at R6.  But going by actual heat units this year it should be at black layer next week.

 Region of the state (city)

Heat Units Accumulated July 19 – July 25 30 Year Average Heat Units July 19 – July 25 Total Heat Units Since March 9

30 Year Average Heat Units Since March 9

Southeast Arkansas (McGehee, AR)

177

197

2,752

2,836

Central Arkansas (Des Arc, AR)

170

199

2,537

2,734

Northeast Arkansas (Jonesboro, AR)

169

188

2,519

2,507

River Valley (Morrilton, AR)

175

186

2,635

2,517


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