2009-11-30_PERMIT FILE - C1981038A ‎(4)‎

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 11/30/2009
• Doc Name: Colorado Discharge Permit ‎(NPDES)‎
• Section_Exhibit Name: Volume 7 Vegetation Data Exhibit 5
• Media Type: D
• Archive: Yes

Volume 7 Exhibit 5
Information Form
recommendation is of special importance. Sugarbeets are an excellent example:
out the information form completely.
There is a delicate balance between yield response (too little N) and quality
• Fill
Interpretations depend on a series of
reduction (too much N).
field and crop factors. Such items as
Deep soil sampling greatly improves nitrogen recommendations for
past crop, manuring, crop to be grown
irrigated crops. Take deep samples to 2 feet, preferably to 4 feet. There is little
and its yield goal, and irrigation, all
point in going deeper unless an unusual situation requires special attention.
enter into the final fertilizer
Sample as follows: surface to tillage depth, tillage depth to 2 feet, and 2
recommendation. Without this
feet to 4 feet. Keep each depth separate. Request a routine test for the surface
information, a fertilizer recommendation
composite sample and NO N only for the subsoil samples.
cannot be tailored to the specific
Situation.
When to Sample
Sample fields before each cropping season. Fertility trends over a period
of years provide important information, indicating the adequacy of a fertilizer
program (too much, too little, about the correct amount).
Handling and Mailing
The closer the samples are taken to planting time, the less chance there is
Soil sample bags and information forms
for changes to occur. This usually is a problem only with N. However, soil
are available at Colorado State
samples may be taken either in the fall or spring. Fall sampling ensures the test
University Cooperative Extension county
results are ready in plenty of time for spring or for fall fertilization when weather
offices, fertilizer and agrichemical
usually is good and time not so critical.
dealers, commercial soil testing
Beware of situations that may cause soil values to change between
laboratories, or from the Colorado State
sampling and planting. For example, heavy rainfall or pre- irrigation on sandy
University Soil, Water and Plant Testing
soils could leach NO 3 -N below the root zone of shallow- rooted crops.
Laboratory, Room A319, Natural and
Environmental Sciences Building,
Tools
Colorado State University, Fort Collins,
A stainless steel soil - sampling probe (moisture probe) is recommended
Colorado 80523; (970) 491 -5061. Mail
for obtaining a soil sample. A shovel also is satisfactory for sampling, but it takes
samples directly to the laboratory of
more time. Tools must be clean and free of rust. Collect the subsamples in a
your choice for analysis.
plastic or stainless steel container. DO NOT USE galvanized or brass equipment
of any kind. It will contaminate the samples with important micronutrients.
Handling
Air -dry soil samples within 12 hours. Air drying samples prevents
microbes from mineralizing soil organic matter that can cause less accurate N
fertilizer recommendations.
Environmental Soil Sampling
Sampling for environmentally - related purposes may require special tools
and different sampling procedures.
Larger diameter probes may be needed for rocky or sandy soils. Use
plastic sleeves that line sample probes to prevent sample contamination or to
keep cores intact for later analysis. Deeper subsoil sampling may be necessary to
evaluate potential sources of minerals at reclamation sites. Wide -mouth 1 -liter
plastic containers with screw caps can prevent moisture loss (if soil moisture
needs to be evaluated) and provide enough soil for the tests required. Whether
sampling for environmental or agricultural purposes, it is important to obtain a
sufficient number of subsamples to adequately evaluate a site.
• Issued in furtherance of Cooperative Extension work, Acts of May S and June 30, 1914, in
J. R. Self, manager, Colorado State cooperation with the U.S. Department of Agriculture, Milan A. Rewerts, Director of Cooperative
University Soil, Water and Plant Testing Extension, Colorado State University, Fort Collins, Colorado. Cooperative Extension programs are
Laboratory; and P.N. Soltanpour, professor; available to all without discrimination. No endorsement of products mentioned is intended nor is 'R —51
soil and crop sciences. criticism implied of products not mentioned.
90 .Nov 20