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06
Jun
2014
Arkansas Corn and Grain Sorghum Weekly Update – June 6, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

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

Even though most of the corn fields received over an inch of rain last week, that rain is now gone and fields are calling for irrigation according to the Arkansas Irrigation Scheduler.  The largest corn is using 0.20” to 0.25” of water a day.  If you have a deficit set of 1.50”, that is only seven days before you have to irrigate.  I am taking advantage of the upcoming rain chances this weekend and applying pre-tassel nitrogen applications on fields where it was planned.  It is a little early but I would always rather go early than late.  A high wind storm hit northeast Arkansas on June 5 and we are waiting to hear if there was any damage to fields in that area.  Many corn fields are at the stage where high winds can cause green snap.

County

Hybrid

Growth Stage

Weekly Rain

Comments

———-Corn———-

Arkansas DKC64-69 VT3P

V11

1.40

Applied 100 lbs of Urea (46 units N) on June 5. (Scouted June 5)
Clay DKC64-83 VT3P

V5

0.90

Applied 50 lbs of ammonium sulfate plus 50lbs of Urea followed by 40 gallons of 32% (173 units N) on June 2.  Applied 3.2 pts of Halex GT plus 1.5 qts of atrazine on June 3.  (Scouted June 3)
Jefferson DKC62-08 SS

V10

2.05

Applied 30 gallons of 32% (105 units N) followed by 3.6 pts of Halex GT plus 2 qts of Atrazine on May 22.  (Scouted June 2)
Lee DKC66-87 VT2P

V11

1.30

Recommended irrigation this week, apply 100 lbs of Urea next week before next irrigation.  (Scouted June 4)
Lonoke Armor 1330

V12

1.30

Recommended 100lbs of Urea followed by an irrigation if no rain. (Scouted June 5)
Mississippi Pioneer 2089YHR

V11

1.25

Recommended 100 lbs of Urea followed by an irrigation if no rain. (Scouted June 3)
St Francis Terral 26BHR50

V13

3.30

Applied 200 lbs of Urea + 100 lbs of ammonium sulfate (113 units N) on June 4.  (Scouted June 4)
White Armor 1550PRO

V12

1.30

Recommended applying 100 lbs of Urea and irrigate.  (Scouted June 4)

———–Grain Sorghum———-

Chicot Dyna-Gro 765B

V11

3.70

Field looks good and is growing well.  (Scouted June 2)
Prairie Pioneer 84P80

V10

1.05

Field looks good and is growing well.  (Scouted June 4)

 

Average CRVP Growth and Development vs. 2014 CRVP.

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 11 612 610

V8

45 43 22 18 791

766

V10

51

48 36 34 922 905
V12

56

56 52 51 1036

1045

V14

61   67   1155  

V16

65   82  

1256

 

R1

72   106  

1452

 

R2

78   115  

1615

 

R3

84   115   1811  

R4

91   115  

2005

 

R5

98   115  

2199

 

R6

122   115   2919

 

Harvest

145   115  

 

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

The earliest corn is beginning to tassel. Pre-tassel nitrogen is being applied this week ahead of the potential rain this weekend.  Plenty of moisture, sunshine, and warm weather has the corn growing at a rapid pace.

Central Arkansas Update – Brent Griffin (Prairie County)

A majority of corn and grain sorghum has received herbicide and nitrogen layby fertilizer in Prairie County. On and off rain have totals of 2.5 to 4″. Some polypipe has been laid in corn fields. Corn will be approaching tassle within 7 to 10 days. Some corn earworms have been noted in conventional corn and sorghum whorls.

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

Lawrence County – We have some early planted corn that has had pre-tassel nitrogen applied before the predicted rains hit us again over the next couple of days.  We have a few late planted fields that have just been side dressed.  Overall the warm weather we have had lately has really made a difference in our corn crop.

Craighead County -Corn is progressing rapidly due to higher temperatures and sufficient precipitation. We are currently experiencing strong storms and 60 mile per hour winds. We will evaluate the result of this storm on the corn crop as soon as possible.

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

The corn has started looking pretty good despite the continued cloudy and wet weather. Some producers are worried that they’ve lost some nitrogen due to the excessive rainfall we’ve had this spring and have been putting more nitrogen out in a pre-tassel application.  We need some sunshine, but it doesn’t look like we are going to get it in the next few days.   We are picking up some armyworms in refuge corn and grain sorghum in Faulkner County.  Sugarcane beetles have also been a problem on later planted corn.  One corn silage field was destroyed by beetles and will have to be replanted.

Heat Units

Heat units accumulated this week were above the 30 year average.  It is taking on average 905 heat units from planting to get to the V10 stage and 1045 units to get to V12 in the corn verification fields.

Region of the state(city)

Heat Units Accumulated May 31 – June 6

30 Year Average Heat Units May 31 – June 6

Total Heat Units Since March 9

30 Year Average Heat Units Since March 9

Southeast Arkansas (McGehee, AR)

198

183

1,425

1,462

Central Arkansas (Des Arc, AR)

194

182

1,276

1,343

Northeast Arkansas (Jonesboro, AR)

188

167

1,257

1,196

River Valley (Morrilton, AR)

196

164

1,352

1,221


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