ASHS Press Releases

American Society for Horticultural Science

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Shadehouses with Photoselective Nets Featured in Study of Growing Conditions

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Study results may help predict plant responses to light, temperature

Researchers monitored environmental data inside shadehouses with full covering of red, blue, pearl, and black nets in central Florida over 12 months. The report documents the different environmental modifications inside the structures, which will help predict or interpret specific plant responses, including photosynthetically active radiation and air temperatures.

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Laser Technology Sorting Method Can Improve Capsicum Pepper Seed Quality

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Chlorophyll fluorescence proves effective, nondestructive technique to upgrade seed lots

Scientists investigated the efficacy of chlorophyll fluorescence (CF) sorting using different maturity fruits of four different cultivars of Capsicum peppers. Results showed that CF sorting significantly increased laboratory germination, seedling emergence, and seed vigor. The researchers said that CF can be a reliable tool to separate high-quality seeds from low-quality seeds in variously matured pepper seed lots, thus improving seedling production and uniformity through enhancing the seed lot vigor.

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Turfgrass Tested in Shallow Green Roof Substrates

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Recommendations for Manilagrass planting, irrigation found in study

Researchers studied the drought tolerance of Manilagrass grown under green roof conditions and two irrigation regimes. They found that substrate depth was the most significant factor that improved growth and drought resistance, and that a deeper substrate improved drought tolerance compared with a shallow substrate. The study recommended that if substrate depth is reduced due to load specifications, irrigation of Manilagrass should exceed 6 mm every 3 days to ensure growth and overcome moisture deficits.

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Juniper Essential Oil Characteristics Determined

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Rocky Mountain juniper’s oil content and composition vary with seasons, tree gender

Scientists evaluated Rocky Mountain juniper trees for changes in year-round essential oil content and composition. They found that the concentration of essential oil in fresh leaves varied, and that oil content in the male tree was greater than that of the female tree at most sampling points, thus demonstrating that both content and composition of essential oil from Rocky Mountain juniper are subject to seasonal changes and also depend on the sex of the tree.

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Flame Cultivation Promising as Weed Control Method for Cranberry

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Open flame torches shown to be cost-effective, non-fatal to crops

Researchers evaluated damage and recovery responses of four cranberry varieties to handheld propane flame cultivation torches used for spot weed control. They found that the flame cultivation technique caused less damage to cranberry plants than incidental exposure to glyphosate during spot treatment of weeds. The results indicated that flame cultivation could be successfully integrated into weed control for cranberry crops in certain situations, including organic farming.

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Weather, Yield Compared for Horticultural Crops in Wisconsin, Southern Ontario

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Comparison of 55 years of data emphasizes need for breeding heat-tolerant vegetables

A study determined the relationship between long-term weather and yield of 11 horticultural crops and one field crop in Wisconsin. The number of hot days during the growing season was determined to be the most important factor among the weather conditions examined. Results revealed the importance of the amount and frequency of seasonal precipitation, showed the negative effects of extreme temperatures on vegetable crop yields, and emphasized the importance of breeding vegetables for heat tolerance.

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