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Northwest Iowa Crops Page |
Spring 2002 Subsoil Moisture Survey Results
- Counties: Carroll, Calhoun, Sac, Crawford, Monona and Ida
- Date Sampled: April 5, 2002
Most sampling areas picked up 2 to 3 inches of plant available water (PAW) over the winter and spring months when compared to the fall samples. Soil moisture status remains variable across the region. Subsoil moisture status ranges from a low of 2.0 inches (17 % soil capacity) plant available water under an alfalfa field in Monona County to 11.0 inches PAW (91% soil capacity) under a soybean field in Sac County. On average across sampling locations, this is the best spring soil moisture condition the region has had since the spring of 1999.
Carroll, Sac, Ida and Pocahontas counties have the best soil moisture profiles, averaging 9.2 inches of plant available water in the top 5-feet. This is an average of 78% of the soil’s total holding capacity. Ida County had the greatest increase in soil moisture over the winter; adding 4 inches (PAW) to the soil profile. On the other hand, Monona, Crawford and Calhoun counties need substantial spring rains to replenish the soil moisture profile. These 3 counties have an average of 4.7 inches (PAW), which is 40% of the soils holding capacity. The soil profile in the driest counties needs to be recharged in the 3 to 5 foot depth level.
Graphs
Detailed Excel worksheet
|
County |
Township |
Site |
Soil |
Previous |
Sample Date |
Plant Available |
|
| Inches | % | ||||||
|
Carroll |
Washington |
Heinen |
Marshall |
Soybean |
4/5/02 | 9.5 | 77 |
|
Crawford |
Paradise |
Steffen |
Monona |
Corn |
4/5/02 | 4.6 | 39 |
|
Crawford |
Paradise |
Steffen |
Monona |
Soybean |
4/5/02 | 5.5 | 47 |
|
Ida |
Grant |
Schug |
Monona |
Corn |
4/5/02 | 8.2 | 70 |
|
Ida |
Maple |
Goodenow |
Marshall |
Corn |
4/5/02 | 8.2 | 66 |
|
Ida |
Griggs |
Parker |
Galva |
Corn |
4/5/02 | 11.1 | 90 |
|
Monona |
Center |
WIRF |
Monona |
Soybean |
4/5/02 | 4.5 | 39 |
|
Monona |
Center |
WIRF |
Monona |
Corn |
4/5/02 | 5.5 | 47 |
|
Monona |
Center |
WIRF |
Monona |
Alfalfa |
4/5/02 | 2.0 | 17 |
|
Sac |
Richland |
Buehler |
Primghar |
Corn |
4/5/02 | 9.6 | 78 |
|
Sac |
Eurek |
Riniger |
Galva |
Soybean |
4/5/02 | 11.3 | 91 |
|
Sac |
Jackson |
Berry |
Clarion |
Corn |
4/5/02 | 8.9 | 81 |
|
Sac |
Sac |
Graber |
Canisteo |
Soy bean |
4/5/02 | 7.6 | 78 |
|
Sac |
Wheeler |
Wilken |
Marshall |
Corn |
4/5/02 | 8.9 | 72 |
|
Pocahontas |
Roosevelt |
Reigelsberger |
Nicollett |
Corn |
4/5/02 | 8.8 | 80 |
| Calhoun | Elm Grove | Finley | Nicollett | Soybean | 4/5/02 | 5.9 | 53 |
Graphs
Detailed Excel worksheet
Todd Vagts
Iowa State University Extension
Field Crops Specialist
1240 D. Heires Avenue
Carroll, IA 51401
Office: 712-792-2364; Cell: 712-249-6025; Fax: 712-792-2366
Email: vagts@iastate.edu
This page last updated on 01/26/05
IOWA STATE UNIVERSITY
OF SCIENCE AND TECHNOLOGY