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macronutrient - Essential elements required in larger amounts for plant growth (e.g. nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, carbon, hydrogen, and oxygen).

matting - Working topdressing or other materials into a turfgrass area with drag mats, usually made of fiber, rubber, or metal.

microclimate - The climate of a small, distinct area such as a golf hole, green site, etc.

microenvironment - The area in the immediate vicinity of the turfgrass plant from the surface to the depth of root penetration into the soil.

micronutrient - Essential elements required in small amounts for turfgrass growth (e.g. iron, manganese, zinc, copper, molybdenum, boron, and chlorine).

microorganisms - Small organisms, such as bacteria and other minute entities, invisible to the unaided eye.

mildew - A plant disease in which the causal fungus forms a coating over the surface of the plant parts. The coating, which is mycelial growth, is usually thin and white. There are two types of mildew - downy and powdery.

mixture, seed - A combination of seeds of two or more turfgrass species.

mold - Any fungus that produces a superficial, often wooly growth on various types of organic matter, or the growth itself.

muck- Well decomposed organic soil. Contains more silt and clay (mineral) than peat.

mulch - A material such as straw, netting, geotextile cover, burlap, etc., spread over seeded or stolonized areas to protect them from erosion, moisture loss, temperature extremes, and to enhance germination and growth.

mycelium - The vegetative body of a fungus.

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native grasses - Grasses that are indigenous or which occur naturally in a particular region.

nematicide - A chemical agent used to kill or suppress nematodes.

nematode - Small, round worms, usually microscopic and colorless, that live in moist soil, water, or in decaying or living organic matter. Plant parasitic forms puncture plant tissues by means of a stylet and live by sucking the juice of the plant.

nitrification - Biological conversion of ammonium into nitrates in soils by soil organisms.

nitrogen carriers - Fertilizers containing the element nitrogen.

node - The joint of a grass stem from which leaves and buds arise.

noxious weeds - Weeds categorized by law as objectionable in a seed lot for commercial sale.

nursery - An area set aside for testing new turfgrass cultivars and chemicals and for growing replacement turf primarily for putting greens and tees.

nutrients, plant - The elements taken in by the plant essential to its growth.

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organic fertilizer - Fertilizers containing carbon and hydrogen.

organic, natural - Fertilizers derived from naturally-occurring, complex organic compounds not readily soluble in water.

organic, synthetic - Man-made organic fertilizers such as urea, IBDU, urea formaldehyde. All slow release nitrogen except urea.

organic matter - Material derived from plant or animal source. Often added to topdressing soil mixtures to give added water and nutrient holding capacity to the soil.

organic soil - A general term used in reference to any soil, the solid part of which is at least 20 percent organic matter.

overseed - To sow seed over an area that is sparsely covered with some kind of vegetation or to plant a winter turf of a cool season species within a dormant warm season turf.

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Partner Links
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The USGA and Chevron have committed to using the game of golf to encourage students in science, technology, engineering and math (STEM) disciplines. This commitment has led to the creation of extensive golf-focused STEM teaching tools, and has resulted in charitable contributions to support golf-related programs through Eagles for Education™

At U.S. Open Championships the Chevron STEM ZONE™ is an interactive experience highlighting the science and math behind the game of golf through a variety of hands-on exhibits and experiments.

The partnership has also produced educational materials such as the Science of Golf video series and a nationally-distributed newspaper insert which are provided to teachers as tools to enhance existing curriculum in schools. These lessons teach the science behind the USGA’s equipment testing, handicapping, and agronomy efforts.

For more interactive experiences featuring golf-focused STEM lessons, visit the partnership homepage.

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Rolex has been a longtime supporter of the USGA and salutes the sportsmanship and great traditions unique to the game. This support includes the Rules of Golf where Rolex has partnered with the USGA to ensure golfers understand and appreciate the game.

As the official timekeeper of the USGA and its championships, they also provide clocks throughout host sites for spectator convenience.

For more information on Rolex and their celebration of the game, visit the Rolex and Golf homepage.

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IBM has partnered with the USGA to bring the same technology, expertise, and innovation it provides to businesses all over the world to the USGA and golf's national championship.

IBM provides the information technology to develop and host the U.S. Open’s official website, www.usopen.com, as well as the mobile apps and scoring systems for the three U.S. Open championships. These real-time technology solutions provide an enhanced experience for fans following the championship onsite and online.

For more information on IBM and the technology that powers the U.S. Open and businesses worldwide, visit http://www.usopen.com/IBM

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Lexus is committed to partnering with the USGA to deliver a best-in-class experience for the world’s best golfers by providing a fleet of courtesy luxury vehicles for all USGA Championships.

At each U.S. Open, Women’s Open and Senior Open, Lexus provides spectators with access to unique experiences ranging from the opportunity to have a picture taken with both the U.S. Open and U.S. Women’s Open trophies to autograph signings with legendary Lexus Golf Ambassadors in the Lexus Performance Drive Pavilion.

For more information on Lexus, visit http://www.lexus.com/

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American Express

Together, American Express and the USGA have been providing world-class service to golf fans since 2006. By creating interactive U.S. Open experiences both onsite and online, American Express enhances the USGA’s effort to make the game more accessible and enjoyable for fans.

For more information on American Express visit www.americanexpress.com/entertainment

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