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Theo J. Blom and Brian D. Piott

The effect of constant 16C and noncontrolled soil temperature on flowering of four Alstroemeria cultivars grown in a greenhouse was studied over 3 years. Soil temperature regime did not influence either the start or cessation of flowering. During spring/summer, production was 15% lower under constant soil temperature, irrespective of cultivar. During fall/winter, the effect of constant soil temperature was cultivar-dependent; yield of `Red Sunset' was increased by 150%, while that for `Rio' decreased by 2270 relative to the noncontrolled. Annual production was not affected, but the ratio between the production of spring/summer and fail/winter decreased from 3.1 to 2.2 for noncontrolled and constant soil temperature, respectively.

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Bau-Show Lin and Yann-Jou Lin

overlapping ( Table 3 ). The order of effectiveness of the 12 species in surface-soil cooling was somewhat different from that in air cooling ( Table 3 ). Relative contributions of plant and leaf characteristics to cooling effects. Stepwise regression analysis

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Ronald D. Morse

Potato (Solanum tuberosum L.) yields in Virginia and other hot climates are considerably lower than in cooler areas, predominately because of high soil temperatures during set and bulking of the tubers. Although organic surface mulches conserve soil moisture and lower soil temperature, often resulting in increased tuber yields, applying organic mulches is commercially cost-prohibitive. Preliminary experiments were conducted in 1995 and 1996 at the VPI&SU Agricultural Research Farm to compare production of `Yukon Gold' potato in no-till (NT) raised-bed systems with standard conventionally tilled (CT) methods. No-till yields were higher than CT both years, although differences were not significant. Based on these data, the NT production system used in these experiments is a viable management option, at least in hot climates such as Virginia. Rainfall during tuber bulking in 1995 and 1996 was above average, even excessive at times, which possibly negated the beneficial soil-cooling and moisture-conserving effects of the in situ mulches on potato yield enhancement. Greater yield increases would be expected in NT plots in normal rainfall years.

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a mulch when growing romaine lettuce from transplants reduced weed growth and increased lettuce growth relative to unmulched plots. Increased lettuce growth was associated with significantly reduced soil cooling (resulting in warmer soil) in mulched

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Shuresh Ghimire, Edward Scheenstra and Carol A. Miles

production. Although WeedGuardPlus mulch remained intact over the growing season, it had a soil cooling effect, which delayed and reduced sweet corn yield in this study. This soil cooling effect may be beneficial in regions or for crops where heat stress is a

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Steven M. Borst, J. Scott McElroy and Greg K. Breeden

such as concrete surfaces, tree roots, compacted soils, cool damp soils, and golf course putting greens ( Boesch and Mitkowski, 2005 ). Once established on a golf course putting green, silvery-thread moss can be difficult to control due to its

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Shigeoki Moritani, Hirotada Nanjo, Atsushi Itou and Teruki Imai

the cooling effect. As a result of the greater cooling demand during the middle hours of the day, it is essential that the soil cooling system be able to reduce the temperature rapidly in response to heat inflow into the soil. In this study, two types

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Rahmatallah Gheshm and Rebecca Nelson Brown

temperatures when used during the summer ( Munn, 1992 ; Sánchez et al., 2008 ). Soil warming has been shown to increase yields of lettuce grown in high tunnels in early spring and late fall ( Bumgarner et al., 2011 ), and soil-cooling effects of organic

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Kayla Snyder, Amanda Grant, Christopher Murray and Bryon Wolff

results obtained when measuring temperature under films of different color. Although it is known that mulch films reduce soil evapotranspiration and therefore affect the extent to which soil cools through evaporation ( Al-Kayssi, 2002 ), there are few