How to Calculate PEAQ
Follow the following steps to calculate PEAQ:
- Select a representative 2 ft square area.
- Determine the stage of growth for the most mature alfalfa plant stem in the selected area by referring to table 1 and record maturity value.
- Select the tallest alfalfa plant and measure the height from soil
to top tip of stem (not the tip of leaf), straighten the stem and record
your measurement in inches.
Note: The tallest stem may not be the most mature stem. Do your measurements on the tallest stem of the most mature stage of growth.
- Use PEAQ chart or on-line calculator to estimate relative feed value (RFV) based on plant height and maturity value.
- For best results, repeat the above step in multiple areas in your field and average the results.
Important: PEAQ estimates relative feed values in the field. PEAQ does not account for changes in quality due to wilting, harvesting, weather damage, and storage. To estimate harvested relative feed values subtract 15 to 20 RFV points from calculated values.
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Table 1 Alfalfa Growth Stages This picture is of the alfalfa plant in late bud stage (3 or more nodes with buds) and was modified from "How An Alfalfa Plant Develops" Produced by Certified Alfalfa Seed Council, Inc. Davis, California
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| Maturity Value | Description |
|---|---|
| Late Vegetative | Stem length >12 inches |
| Bud Stage | 1 or more nodes with visible buds. No flowers visible |
| Flower Stage | 1 or more nodes with open flower(s) |
