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11
May
2012
Arkansas soybean crop update for the week of May 7, 2012
Author: Jeremy Ross, Extension Agronomist - Soybeans

Weather:  The 10-day forecast predicts daily high temperatures in the upper 70’s to upper 80’s with daily low temperatures in the lower to upper 60’s.  These average daily high temperatures will be slightly above normal for this time of year.  Most of the northern half of the state received some much needed rainfall, with amounts ranging from less than an inch to over 5 inches.  The southern half of the state is still very dry.  The next best chance of rainfall is this weekend.  Topsoil moisture supplies were 10% very short, 43% short, 44% adequate and 3% surplus.  Subsoil moisture supplies were 5% very short, 38% short, 56% adequate and 1% surplus.

Crop:  As of May 6, 2012, producers had 57 % of the soybean crop planted, 38% ahead of 2011 and 32% ahead of the five-year average.  Soybean emergence was at 41%, 28% ahead of 2011 and 27% ahead of the five-year average.

Percent of Soybean Progress (released May 6, 2012)

Soybean Stage

Current Wk.

Previous Wk.

2011

5-Year Avg.

  Planted

57

45

19

25

  Emerged

41

26

13

14

Wes Kirkpatrick – Desha County

The soybean crop in Desha County is 75-80% planted.  We missed rain that the northern part of the state received, and we are still very dry. Most of the soybean planting is shutting down due to lack of moisture. Crop growth stages range from not emerged to V3.  Other than lack of moisture, pigweed is biggest issue right now.  LibertyLink acreage has increased to around 3,000 to 5,000 acres.  This is doubled last year’s LibertyLink acreage.  A lot of Prefix going out for pigweeds control.  We are waiting for wheat harvest to plant the double-crop soybean crop, which will be less than 5% of the soybean acreage.

Robert Goodson – Phillips County

75-80% of the soybean crop has been planted.  Some early March soybeans are blooming. We have had a problem with getting preemerge herbicide activated.  Rainfall this week ranged from 0.2 to 1.2 inches of rain.  The heat last week really made soybean crop grow, and overall the crop is looking good.  Irrigation will start in the next few day on early planted beans.  No other problems are arising right now.

Mike Hamilton – Poinsett County

65% of the soybean crop has been planted in Poinsett County.  Most of what has been planted is up or is coming up with rain.  Rainfall ranged from 0.5 to 1.5 inch.  Most of the rainfall soaked in to the ground.  Vigor and emergence of the soybean crop has been good so far, with most of what has been planted coming up in 4 days.  Some producers are having trouble with keeping weeds under control.

Andy Vangilider – Clay County

Clay County has 40-45% of the soybean crop planted.  Some fields were planted early with cool soil, but most of these fields are emerged.  Soil moisture low last week.  Most of the county got a good rainfall on Monday, with most getting around 3 inches of rainfall.

Brent Griffin – Prairie County

60% of the soybean crop is planted in Prairie County.  We’ve had good emergence this year with soybeans emerging  in 5-7 days.   Some fields will need replanting due to heavy rains.  Some areas of the county received 4 inches rainfall.  So far, we have had a good start.  The main concern with conventional field is with preemerge herbicide activation. We are already having to spray for pigweed in conventional fields.  We are a long way down the road compared to last year.  No other major problems are noted yet, but we are picking up a few Yellowstriped armyworms and thrips in some areas.

Soybean Inoculants

I’ve received a few calls about growers forgetting to apply inoculants to soybean seed that is being planted to fields where soybean has not been in the rotation for several years.  The University of Arkansas Division of Agriculture recommends using a soybean inoculant in fields that have not had soybean planted within three years.  We have been looking at several seed treatment products over the last few years, and all of the products we looked at perform similarly.  Once the soybean seed has been planted, there is no way of getting the inoculants down to the seed.  Under normal conditions, nodules begin to form on the soybean roots at V3.   During the growing season, soybean roots should have at least 7 to 10 active nodules for maximum nitrogen fixation.  If nitrogen deficiency symptoms appear, supplemental nitrogen may be needed.

Liberty Herbicide Supply

I just heard this week that the supply of Liberty Herbicide could be tight for this year.  Because of the tight supply, producers should contact suppliers to insure that they will have enough Liberty for when they need to spray.

Some producers are still concerned about LibertyLink varieties not yielding.  We have looked at LibertyLink varieties for the last four years, and we have not seen any yield problems with the current LibertyLink varieties that are commercially available.  Below is 2011 yield data from two locations where we compared LibertyLink varieties to Roundup Ready varieties.  The Marvell location was non-irrigated and the Poinsett County location was irrigated.  This data shows that the LibertyLink varieties yielded as well if not a little better than the Roundup Ready varieties tested.  Just keep in mind that placement of these varieties in important.  Just like with any other crop, if a soybean variety is placed under adverse conditions, it will not perform to its maximum potential.

 Yield of Liberty Link varieties


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