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Continuous Corn
SOIL QUALITY IMPACT AFTER FOUR YEARS OF MANURE APPLICATION RATES AND SCHEDULES
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Long term (2000-2004) impacts of manure application were analyzed. Manure was applied in the spring or fall and the incorporation time varied by treatment (Figure 1). All plots were analyzed for microbial diversity, pH, electrical conductivity, infiltration, and organic matter in fall 2003. Water retention samples were collected in spring 2004 and are currently being analyzed. The soil quality results are summarized in Table 1. |
Table 1. Soil quality data summary.
Treatment |
Bulk Density |
Infiltration |
HPC Diversity 1 |
pH |
EC 2 |
OM 3 |
1 |
1.19 |
0.36 b |
1.60 ab |
7.90 |
1.14 c |
1.62 |
2 |
1.21 |
0.44 a |
1.65 ab |
7.90 |
1.36 a |
1.58 |
3 |
1.21 |
0.38 ab |
0.80 c |
7.92 |
1.31 ab |
1.72 |
4 |
1.20 |
0.40 ab |
0.95 bc |
7.88 |
1.30 ab |
1.58 |
5 |
1.20 |
0.43 ab |
1.98 a |
7.90 |
1.29 ab |
1.60 |
6 |
1.20 |
0.39 ab |
1.55 ab |
7.90 |
1.25 bc |
1.68 |
2 EC is the electrical conductivity of the soil in mmhos/cm.
3 OM represents the organic matter as a percentage.
Results
- Soil bulk density, pH, and OM were insignificant (p<0.05) among treatments compared to one another.
- Heterotrophic plate count, anaerobic bacteria (includes facultative anaerobes), yeast and mold, Actinomycetes, Pseudomonads, nitrogen-fixing bacteria were also counted and were insignificant (p<0.05) by treatment.
- Anaerobic bacteria (includes facultative anaerobes) diversity, yeast and mold diversity, Actinomycetes diversity, Pseudomonad diversity, nitrogen-fixing bacteria diversity, and species richness diversity were insignificant (p<0.05) by treatment.
Funding provided by the Colorado Agricultural Experiment Station.
Colorado State University | CSU Extension | Dept. of Soil & Crop Sciences
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Last updated November 5, 2007 by Webmaster