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[Home]Newsletter 2005 ] Field and Feedlot ] Stakeholder Report ] Soybean Aphid ] Soybean Rust ] Special Topics ] Crop Modeling ] Weather Data ] Yield Trials ] IA Crop Stats ] Subsoil H20 ]
[
ISU Extension][IA State University]

Spring 2001 Subsoil Moisture Survey Results

  • Counties:  Carroll, Sac, Crawford, Monona and Ida
  • Date Sampled:  April, 2001

Graph
Detailed Excel worksheet

The soils across the region gained much moisture over the winter and early spring months when compared to samples taken last fall. Some fields picked up as much as six inches of water since last November. Yet areas in Monona, Ida, Sac and Crawford counties still require more rainfall to bring the soil profile up to Capacity. In many areas, the soil profile is still only at 50 to 60 % of capacity for plant available water (PAW). PAW ranges from a low of 31% of capacity in a Monona county alfalfa field to a high of 86% of capacity in a Sac county soybean field. Due to wet conditions in Buena Vista and Pocahontas counties during the sampling period, samples were not taken in these counties and the profiles were assumed to be filled to capacity.

Table 1 shows the inches of plant available water (PAW) for the top five feet of the soil profile at the sampling locations. Table 2 shows the percent of PAW that is present compared to a soil profile filled to capacity

Table 1. Soil moisture available to plants, in inches

Inches PAW (60 Inch Depth)

County Soil Crop

Sample Date

Spring-01

Fall-00

Spring-00

Carroll Marshall Silty Clay Loam Corn

9-Apr

10.2

5.8

6.6

Average

10.2

Crawford Monona Silt Loam Soybean

9-Apr

6.7

3.9

6.4

Crawford Monona Silt Loam Corn

9-Apr

7.1

3.6

3.8

Average

6.9

Ida Monona Silt Loam Soybean

10-Apr

4.3

1.8

6.9

Ida Marshall Soybean

10-Apr

5.3

1.2

6.6

Ida Marshall Benches Soybean

10-Apr

6.6

1.6

6.4

Average

5.4

Monona Monona Silt Loam Corn

9-Apr

5.5

1.2

2.8

Monona Monona Silt Loam Soybean

9-Apr

8.2

2.2

4.7

Monona Monona Silt Loam Alfalfa

9-Apr

3.7

0.0

2.9

Average

5.8

Sac Primghar Soybean

13-Apr

10.6

4.4

7.4

Sac Galva Corn

13-Apr

9.6

3.8

4.7

Sac Clarion Soybean

13-Apr

8.4

4.7

7.1

Sac Canisteo Corn

13-Apr

7.0

2.8

4.1

Sac Marshall Soybean

13-Apr

8.1

3.4

6.4

Average

8.7

 

Table 2. Percent Plant Available Water (PAW) present compared to total possible in 60 inch soil profile.
County Soil Crop

Sample Date

% PAW

County Average

Carroll Marshall Silty Clay Loam Corn

9-Apr

82.3%

82.3%

Crawford Monona Silt Loam Soybean

9-Apr

57.4%

59.3%

Crawford Monona Silt Loam Corn

9-Apr

61.2%

Ida Monona Silt Loam Soybean

10-Apr

36.9%

44.3%

Ida Marshall Soybean

10-Apr

42.5%

Ida Marshall Benches Soybean

10-Apr

53.4%

Monona Monona Silt Loam Corn

9-Apr

47.3%

49.6%

Monona Monona Silt Loam Soybean

9-Apr

70.1%

Monona Monona Silt Loam Alfalfa

9-Apr

31.3%

Sac Primghar Soybean

13-Apr

85.7%

75.4%

Sac Galva Corn

13-Apr

77.4%

Sac Clarion Soybean

13-Apr

76.3%

Sac Canisteo Corn

13-Apr

72.3%

Sac Marshall Soybean

13-Apr

65.5%

This page last updated on 01/26/05

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