Get the Most from Your Granular & Foliar Fertilizer Applications

Tom Samples, Ph.D.

Although more than 78% of the air we breathe is N2, turfgrasses are unable to capture it from the atmosphere. For this reason, fertilizer manufacturers spend considerable time, effort and money every year developing granular and foliarly applied N-containing fertilizers for turf. Some of these are homogenous, with granules having an equal amount of nutrition. Others are blends of several nutrient sources or carriers. Depending on how it is formulated, a fertilizer may release N very quickly or for an extended period of time. Since energy is required to convert atmospheric N2 to ammonium (NH4+) and nitrate (NO3-), the forms that turfgrasses use, the cost of fertilizers increases as energy and fuel costs rise. Knowing how much N a turfgrass requires, how long N is available after it is applied, the factors that affect how N is released, and the fertilizer’s physical and chemical properties helps you, as a turfgrass professional, make informed decisions when selecting, purchasing and applying N fertilizers. In this 90-minute webcast, Tom Samples, Ph.D., will introduce you to several granular and foliarly applied N fertilizers, factors and mechanisms that affect their rate of N release, and physical properties to consider when comparing products for use on greens, tees, fairways and roughs.

Original presentation date: Apr. 5, 2012

About the instructor

Tom Samples, professor and turfgrass management extension specialist in the Plant Sciences Department of the University of Tennessee-Knoxville, received his doctorate  in crop science (turfgrass science) from Oklahoma State University. His primary interest is the management of turfgrasses exposed to environmental stresses. He has written many publications regarding the selection, establishment, maintenance and renovation of turfgrasses and is very active in the development of educational programs to help advance the turfgrass industry and improve the quality of turfs in the Southeastern U.S.


Member price: Free
Non-member price: $60
Chapter price: $100
Education points: 0.2

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