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of potable water ( Krishna, 2005 ). Parts of Australia and the southwestern United States have embraced rainwater harvesting as a serious way to augment sparse and irregular water supplies ( Lancaster, 2010 ). In Chicago, during the period 2004

black stem rust and several viruses thus far ( Nabhan, 2009 ). Hopi and Navajo, CO Plateau of the Southwestern United States. Vavilov traveled extensively in North America ( Fig. 3 ) and in 1930 he came to Arizona on the invitation of Dr. Homer Shantz

irrigation districts and groundwater supplies throughout the Southwest. Orchard floor management practices of pecan growers in the southwestern United States are varied, ranging from only periodic mowing of vegetation to complete vegetation control through

southwestern United States, AS is commonly used in pecan orchards as the N source where dry fertilizer is used. Pecan producers in the humid southeastern United States more commonly use the AN or urea forms of dry N fertilizer. The disparity between N source in

, aerosols, and particulates) sunlight during the growing season as compared with ≈80% to 90% in a high-light environment such as the southwestern United States and has mean annual relative humidity of ≈70% ( Jacobs, 1968 ). Orchard management characteristics

Cruces, they appeared stressed, small, and slightly wilted. Stinging nettle does not appear well-suited for the hot, dry summers and the alkaline soils with low organic matter that are common in the southwestern United States. In their native habitat

-drained acidic soils and on soils from phosphatic rocks. Deficiency is common in the acidic soils of the southeastern United States and the high pH, calcareous soils of the southwestern United States. There has therefore been extensive research, spanning several

southwestern United States, flood irrigation is typical, trees are mechanically pruned, orchard floors are clean-cultivated, sunlight intensity is greater, and there are fewer cloudy days. In the south-central United States, most orchards are not irrigated, and

Mexico, and the southwestern United States in general, experiences more winter insolation than those locations. These yield estimates may not apply to other cultivars of kale, but in a Colorado study, Red Russian yielded more than Dinosaur and Winterbor

Fernandez (2002) noted that chlorophyll fluorescence is usually affected only after severe drought. Species of maple that have been recommended for landscape use in the arid and semiarid regions of the southwestern United States are Acer barbatum Michx