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SUNUP: Everything You Wanted to Know About NPK,… duration 8 minutes 12 seconds SUNUP: Everything You Wanted to Know About NPK,… SUNUP: Everything You Wanted to Know About NPK, but were Afraid to Ask	SUNUP: Everything You Wanted to Know About NPK, but were Afraid to Ask Brian Arnall explains the basics of soil nutrition and has tips for identifying when a crop needs fertilization help. phosphorous osu research potassium science extension soil plants caption complete npk brain arnall teaching nitrogen oklahoma state university sunup nutrients From Agricultural Communications Services, Divsion of Agricultural Sc 0