ASHS Press Releases

Applying film to orchard floor increases fruit size, color in warmer environments

LLEIDA, SPAIN—In a research report published in a recent issue of HortTechnology, scientists Ignasi Iglesias and Simó Alegre examined the effects of covering orchard floors with reflective films on fruit color, fruit quality, canopy light distribution, orchard temperature, and profitability. The experiments were performed using Extenday™ and Solarmate™ films installed 5 weeks before commercial harvest in orchards of ‘Mondial Gala’ apples. The research showed that the use of both films increased fruit size and color and can result in increased profits for apple growers.

Researchers compare rapid potentiometric, colorimetric methods

PULLMAN, WA—Leafy green vegetables such as lettuce, Asian greens, and spinach can accumulate high concentrations of nitrate–nitrogen (NO3-N), which are potentially harmful if consumed by humans. To measure NO3-N concentration in plant tissue, many laboratories use ion selective electrodes (ISEs). Relatively inexpensive and portable ISE nutrient monitoring devices, including the Cardy NO3-N meter, are widely used to measure fresh plant sap NO3-N levels. Although conventional means of measuring plant tissue NO3-N are accurate and reliable, they often require sophisticated equipment and trained technicians and can be time-consuming, expensive, and impractical outside of a laboratory setting.

Cowpeat viable substitute for peat in container plant propagation

APOPKA, FL—Peat has been a major component of substrates used in container plant production since the 1960s. Highly porous with the capacity to hold water, peat makes an ideal rooting and growing medium for potted plants. But harvesting peat (and draining valuable peatlands in the process) releases the carbon stored in peat into the atmosphere as carbon dioxide. And because peat plays an important role in wetland ecosystems—peat bogs improve groundwater quality and are unique habitats for wild plants and animals—the use of peat has been challenged and peat mining is increasingly regulated.

Researchers have worked for years to find alternative organic materials that can be used as partial or complete substitutes for peat. Composted biosolids, municipal solid waste, and yard trimmings have all been investigated as possible components for use in bedding, landscape and foliage plant production. Now, composted dairy manure is being tested as an economical and environmentally sound alternative to peat.