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Soybeans Planting Underway Throughout Louisiana

Soybeans Planting Underway Throughout Louisiana published on No Comments on Soybeans Planting Underway Throughout Louisiana

by Dr. Ronnie Levy, Soybean Specialist

Louisiana is projected to plant a little over one million acres of soybeans in 2012.    Strong exports and demand for soybeans continue and soybean acres may increase throughout the planting season.  The acres planted will probably be limited by weather.  If the weather is favorable, we could see up to 1.1 million acres of soybeans planted.  Each year seems to present different problems for production, hopefully this will be the year without one. 

 In Louisiana approximately 60% of the acres are planted to maturity group IV’s and 35% of the acres to maturity group V’s.  The remaining 5% is planted to maturity group III’s and VI’s.  Then trend has been toward maturity group IV’s.

 Soybean planting got started early this year with a few acres being planted in late March.  As planting continues to progress, the question always arises – What is the optimum plant population?

 Too dense a plant population reduces yields, encourages diseases and lodging and increases seed cost.  When calibrating planters, use seed per foot as your guide rather than pounds of seed per acre.  In the following table, the estimated pounds per acre should be used only to calculate how much seed to buy.  Because of varietal difference in seed size, as well as seasonal variation within lots of the same variety, planting rates can be misleading if expressed in pounds per acre.  The following rates are recommended:

 

Row Width

Seed/

Plants/

Estimated

Population

(Inches)

Row Foot

Row Foot

lbs.Acre

in 1000s

36-40

8-9

6-8

35

78-104

30-32

6-7

4-5

40

78-104

20-24

5-6

4-5

45

104-130

7-10

4-5

3

70

104-130

Broadcast

5-6/sq.ft.

3/sq.ft.

75-90

150

Late

 

4/sq.ft.

80-100

200

Planting

 When planting is delayed until June 15 or later, the amount of vegetative growth that the plant produces becomes more critical.  It is important to choose varieties that grow rapidly in a short time.  When blooming starts, most vegetative growth ceases in determinate varieties.  When planting late, seeding rates should be increased to compensate for reduced vegetative growth.

 

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