48:52

NPK-University Organic Biostimulants With Harley Smith

26:30

Nutrient Formulation - Precision Fertilizer Management | Harley Smith's Master Growers Series

43:58

NPK-University Plant Essential Elements With Harley Smith

1:03:58

Plant Nutrition Sherlock Holmes Style

37:13

NPK-University Soil Microbiology With Harley Smith

6:05

Best Grow Room Conditions For Maximum Yield - Light (PAR), Temperature and Air (CO2)

1:19:20

Joel Williams - Advancing Plant Nutrition at Groundswell 2018

12:24

Nutrition for Mother Plants | Harley Smith's Master Growers Series