Alkalinity: Focus on the Water Alkalinity, Not the Water pH
48:44
Watering Science and Art
33:08
Getting Phosphorus Right: Optimizing Your Fertilization Strategy
1:17:55
Plant Health Pyramid
22:08
What are pH, EC, TDS, and PPM and How Are They Connected?
6:43
Guidelines for Diagnosing Plant Problems
42:20
Identfication of Nutrient Deficiencies (Greenhouse Plants)
1:19:20
Joel Williams - Advancing Plant Nutrition at Groundswell 2018
1:03:58