ASHS Press Releases

American Society for Horticultural Science

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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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Study of crop and soil nitrogen dynamics results in valuable recommendations for growers

Scientists monitored fertilization and irrigation management practices in 26 fall-planted annual strawberry fields in California. Controlled-release fertilizer rate trials indicated that routine use of high CRF rates was not an efficient practice; the researchers suggested that reducing CRF rates, particularly in heavier textured soils that are less easily leached, could substantially improve nitrogen use efficiency. The report includes several other recommendations for improving nitrogen management in annual strawberry production systems.

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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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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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