Assertion: sweet potato's amount | /r/HasProperty | needed of potassium
Facets:
Source sentences:
text: An alternative would be to apply 19 ounces of 13-13-13 to get the total amount needed of phosphorus and potassium, even though an extra 4 ounces of nitrogen will be applied Watering Sweet potatoes need 10 to 20 inches of water per season.