Risk Assessment

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Alfalfa Autotoxicity Reseeding Risk Assessment

	Points	Score
1. Amount of previous alfalfa top growth incorporated or left on soil surface
Fall cut or grazed	1
0 to 1 ton top growth	3
More than 1 ton top growth	5
2. Disease resistance of the variety to be seeded
High disease resistance	1
Moderate disease resistance	2
Low disease resistance	3
3. Irrigation or rainfall potential prior to reseeding
High (greater than 2 inches)	1
Medium (1 to 2 inches)	2
Low (less than 1 inch)	3
4. Soil Type
Sandy	1
Loamy	2
Clayey	3
5. Tillage prior to reseeding
Moldboard plow	1
Chisel plow	2
No-till	3
6. Sum of points from questions 1-5
7. Age of previous alfalfa stand
Less than 1 year	0
1 to 2 years	0.5
More than 2 years	1
8. Reseeding delay after alfalfa kill/plowdown
12 months or more	0
6 months	1
2 to 4 weeks	2
Less than 2 weeks	3
Your total score (multiply points from 6, 7 and 8)

Alfalfa Reseeding Risk

Your score:	Autotoxicity risk is:	Recommendation:
0	Low	Seed
4 to 8	Moderate	Caution, potential yield loss
9 to 12	High	Warning, yield loss likely
>13	Very High	Avoid reseeding, likely stand & yield loss

Source: Craig Sheaffer, Dan Undersander, and Paul Peterson, Universities of Minnesota and Wisconsin, 2004.