Calcium Products - SuperCal 98G, pH, and Tillage Influence on Soybean and Corn Yield
Calcium Product 98G

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SuperCal 98G, pH, and Tillage Influence on Soybean and Corn Yield

Introduction

A number of South Dakota soils are developing lower pH surface soils primarily due to the acidifying effect of added nitrogen. Two adjacent studies at the Aurora Farm (Brandt loams) were established to adjust soil pH by either lime or sulfur additions to determine the long term effect of soil pH on corn and soybean yield under both conventional and no-till systems.

Materials and Methods

Item:

28112 (Corn 2012)

28212 (Soybean 2012)

Location

Aurora, SD

Aurora, SD

Crop Rotation

Corn-Soybean

Soybean-Corn

Treatments

See Table 1

See Table 2

Tillage Methods

No till and Conventional Till

No till and Conventional Till

Soybean variety/seeding rate

----------------

AsGrow Ag 1431- 160,000 seeds/a

Corn hybrid/seeding rate

DKC 45-51 RIB- 30,000 seeds/a

-----------------

Planting Dates

4/24/12

5/22/12

Plot Size

25’x40’

15’x40’

Harvest Date

10/11/12

9/27/12

Soil Samples

0-2, 2-4, 4-6, 6-12 inches

0-2, 2-4, 4-6, 6-12 inches

Stats

RCB

RCB

Results and Discussion

Soil pH continues to decline on the very low treatment from the elemental sulfur applications applied about 4 years prior under conventional tillage (Table 1). The pH under no till appears to be stable with this treatment. Soluble salts are also elevated under this treatment (data not shown). In addition, the pH continues to decline under the low pH treatment. There has been a slight decline under the moderate pH treatments while the higher treatment appears stable. There were no significant trends in yield for soybean or corn under conventional till or for soybean under no-till. There is a trend for higher corn yield with higher pH levels in 2012 under no-till (Table 1).

For the 282 site, soil pH appears to be stabilizing (from 2006) with the very low treatment under both tillage systems (Figure 2), while under the low treatment the pH is declining under conventional tillage and slightly higher under no-till. No clear trends in soil pH are apparent under the higher pH treatments since 2006. There is a trend for higher corn yields with higher pH levels for 2011 in conventional tillage. Lower and variable yields from dry weather especially in 2012 may have limited yield responses.

 

Table 1. Influence of soil pH amendments on soil pH and grain yield near Aurora, SD in 2011 and 2012. (expt. No. 281)

 

                     ---------   Conventional Till (spring disk)B ---------

-------------- No-TillC --------------

 

TreatmentsA, D

Nov '06

May '11

Nov '11

Nov ‘12

Soybean Grain

'11

Corn Grain

'12

Nov '06

May '11

Nov '11

Nov ‘12

Soybean Grain

'11

Corn Grain

'12

 
 

----------- pH, 0-6”-----------

----   bu/a ----

----------- pH, 0-6”------------

---- bu/a ----

 
   

Very Low

7.1

4.4

5.4

4.5

27.9 ab

103.2 b

7.1

4.2

4.4

4.4

27.6 a

102.0 b

 

Low

5.6

5.4

5.6

5.3

27.0 b

96.0 b

5.6

5

5.1

4.8

32.6 a

101.9 b

 

Moderate

6.9

6.9

6.7

6.6

31.1 a

109.1 a

6.9

6.8

6.6

6.7

30.6 a

126.4 a

 

High

7.2

7.1

7.0

7.0

29.4 ab

75.5 ab

7.2

6.8

7.0

6.9

26.1 a

119.1 ab

 

Pr>F

         

0.19

0.46

Pr>F

     

0.585

0.083

 

CV

         

7.29

9.63

CV

     

20.6

10.0

 

LSD

             

LSD

       

17.8

 

ATotal lime applied and elemental sulfur applied (in tons/a): Very Low- 8 lime, 2.5 S; Low- 1 lime; Moderate- 8 lime; High- 15 lime.

 

BLime applied to soil surface and tilled in.

 

CLime applied and left on surface.

 

DLime rates based on CaCO3 equivalent.

 

 

 

 

 

 

Table 2. Influence of soil pH amendments on soil pH and grain yield near Aurora, SD in 2011 and 2012. (expt. No. 282)

 

                     ---------   Conventional Till (spring disk)B ---------

-------------- No-TillC --------------

 

TreatmentsA, D

Nov '06

May '11

Nov '11

Nov ‘12

Corn Grain

'11

Soybean Grain

'12

Nov '06

May '11

Nov '11

Nov

‘12

Corn Grain

'11

Soybean Grain

'12

 
 

----------- pH, 0-6”-----------

----   bu/a ----

----------- pH, 0-6”------------

---- bu/a ----

 
   

Very Low

7.1

3.9

4.6

4.8

107.7 b

41.4 a

7.1

4.5

4.6

4.5

132.8 a

31.5 a

 

Low

5.6

5.7

5.7

5.5

122.0 ab

35.1 a

5.6

5.5

5.7

5.9

117.9 b

33.8 a

 

Moderate

6.9

7.0

6.6

7.0

124.3 ab

40.5 a

6.9

6.6

6.8

6.9

117.1 b

33.6 a

 

High

7.2

7.2

7.3

7.1

138.9 a

38.6 a

7.2

6.7

7.0

6.3

122.7 ab

32.0 a

 

Pr>F

         

0.27

0.894

Pr>F

     

0.14

0.44

 

CV

         

13.9

28.0

CV

     

6.17

6.07

 

LSD

         

NS

NS

LSD

     

NS

NS

 

ATotal lime applied and elemental sulfur applied (in tons/a): Very Low- 8 lime, 2.5 S; Low- 1 lime; Moderate- 8 lime; High- 15 lime.

 

BLime applied to soil surface and tilled in.

           

CLime applied and left on surface.

DLime rates based on CaCO3 equivalent.

               

 




tilled1

tilled2

tilled3

tilled4

 

 

Additional Info

  • Article Reference:: Calcium Products, Inc.
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