ASHS Press Releases

American Society for Horticultural Science

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ASHS Press Releases
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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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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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Conservation tillage using roller-crimper and green manure improves zucchini yield, quality

Researchers tested the effects of vetch residue management strategies incorporating green manure using a roller-crimper and different organic fertilizers on organic zucchini yield and quality. When averaged over 2 years of the experiment, marketable zucchini yield increased by 15.2% and 38% with the roller-crimper, mulch, and green manure plow-down, respectively. The findings suggest that effective vetch cover crop management and the application of organic fertilizers can improve yield and quality of organically managed zucchini.

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Propagation study shows novel native species have potential as wholesale nursery additions

Scientists studied softwood stem cutting propagation of four underused shrub species native to the northeastern United States (Ceanothus americanus, Corylus cornuta, Lonicera canadensis, and Viburnum acerifolium). The results indicated that Corylus cornuta and Viburnum acerifolium could be propagated for consideration as commercial crops for wholesale nurseries looking for new native shrubs, and that all four of the species have the potential to be viable commercial crops for nurseries that specialize in native plants.

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Study of Hibiscus acetosella recommends sensor-controlled irrigation systems for commercial growers

A study reported on the growth of Hibiscus acetosella 'Panama Red' in response to various volumetric water content thresholds. Experiments were performed in a greenhouse and on outdoor nursery pads. In all studies, increased irrigation volume led to increased growth; plant height also increased with increasing water content threshold in all studies. Results of the experiments indicated that sensor-controlled irrigation is feasible, and that water content thresholds can be adjusted to control plant growth.

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