Fall Agronomic Quiz

The best time for fall soil sampling is
When air temperature is below 10°C
When air temperature is below 5°C
When soil temperature is below 0°C
When soil temperature is below 5-7°C
Which macronutrients recommendations are based on the plant available amounts in the 0 to 6-inch (0-15 cm) depth sample?
Nitrogen and phosphorus
Phosphorus and potassium
Nitrogen and sulphur
Phosphorus and sulphur
Which of the following weeds is a perennial?
Wild oats
Cleavers
Canada thistle
Kochia
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