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27
Jun
2014
Arkansas Corn and Grain Sorghum Weekly Update – June 27, 2014
Author: Kevin Lawson, Program Associate - Corn & Grain Sorghum Verification

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

Irrigation continues with the corn verification fields.  Producers have been commenting on how this is the latest that they have started the water in recent memory.  When corn reaches the reproductive stage it uses approximately 0.33 inches a day.  If you have a deficit set for 1.50 inches that is only 5 days between irrigations.  All the fields except Clay are in the reproductive stage and pollination is going well.  One more good rain during grain fill in the Chicot County grain sorghum field and we will not have to irrigate at all.

County

Hybrid

Growth Stage

Weekly Rain

Comments

———-Corn———-

Arkansas DKC64-69 VT3P

R1

0.80

Irrigated on June 20.  Recommended irrigate again on June 28. (Scouted June 26)
Clay DKC64-83 VT3P

V10

1.00

Irrigated on June 20.  Recommended irrigate again on July 2.  (Scouted June 24)
Jefferson DKC62-08 SS

R1

0.00

Irrigated on June 23.  Recommended irrigate again on June 30. (Scouted June 23)
Lee DKC66-87 VT2P

R1

0.10

Recommended irrigate on June 25. (Scouted June 25)
Lonoke Armor 1330

R1

1.30

Recommended irrigate on June 28. (Scouted June 25)
Mississippi Pioneer 2089YHR  

Field was too wet to get to this week.
St Francis Terral 26BHR50

R2

0.40

Recommended irrigate on June 26. (Scouted June 25)
White Armor 1550PRO

R2

0.50

Recommended irrigation on June 25. (Scouted June 25)

———–Grain Sorghum———-

Chicot Dyna-Gro 765B

Boot

0.10

If no rain this week recommended irrigation.  (Scouted June 23)
Prairie Pioneer 84P80

V16

0.20

Field needs a rain.  Should be in boot stage soon. (Scouted June 25)

 

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

1046

V14

61

58 67 61 1155

1167

V16

65

63 82 73 1256

1281

R1

72

70 106 102 1452

1504

R2

78

78 115 114 1615

1611

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)

Desha County – Most, if not all corn in the area has tasseled.  Rainfall was scattered earlier in the week, with some areas receiving as much as 2 inches.  Other areas received less than a 0.25 inch, so irrigation continues in those areas.  Several acres are entering the milk stage.

Ashley County – The corn has developed nicely over the last week, a lot of brown silk showing.  Rainfall amounts this week varied from 0.5 to 2 inches.  No corn borer moths have been caught this year in our traps.

Central Arkansas Update – Brent Griffin (Prairie County)

Rainfall was spotty early this week with 0.5 to 2 inches in places. Irrigation continues with corn tasseling. Sorghum is nearing boot stage with dryland needing a rain.

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

Lawrence County – Rainfall has been spotty here in Lawrence County.  Some areas have received close to 0.5 inch while others received closer to 1 inch or more.  Several fields did not get a rain at all or not enough and have the irrigation wells running.  We have corn at various stages with some fields close to tasseling and others at R2 or blistering.  Grain sorghum is also in various growth stages with some actually in late boot.

Craighead County – Rain this week was highly variable ranging from 0 to 4 inches. Irrigation continues on all fields and with the last of pre tassel nitrogen being applied. Many fields are tasseling and beginning to pollinate. Temperatures are continuing to be favorable for rapid plant development. There were some reports of spotty hail associated with some of the stronger thunderstorms but damage was minimal.

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

No major diseases or insects were observed this week. Corn fields were irrigated due to sporadic rainfall. Rainfall amounts varied from a 0.5 to 1.5 inches. Grain sorghum is approaching early to mid- boot.  Rains have provided much needed relief for dryland fields.

Heat Units

Heat units remained high this week and similar to the 30 year average.

 Region of the state (city)

Heat Units Accumulated June 20 – June 27

30 Year Average Heat Units June 20 – June 27

Total Heat Units Since March 9

30 Year Average Heat Units Since March 9

Southeast Arkansas (McGehee, AR)

202

198 2,010

2,047

Central Arkansas (Des Arc, AR)

197

200 1,823

1,932

Northeast Arkansas (Jonesboro, AR)

198

189 1,808

1,748

River Valley (Morrilton, AR)

198

188 1,908

1,766


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