HORTICULTURE

Heat Zone Considerations

Though hardiness zone ratings for plants have been studied and adjust­ed for many years in response to the earth’s natural climate changes, only recently has research into the impact of excessive warmth on plant growth been initiated. In the mid-90s, the American Horticultural Society began the development of data that tracked the number of days that various regions of the United States experienced tempera­tures higher than 86 degrees Fahrenheit (30 degrees Celsius). Termed a heat day, it represents the point at which a plant will begin to experi­ence physiological injury because of the temperature. Using a county - specific map, similar to the USDA Hardiness Zone Map, the AHS has divided the nation into 12 heat zones, with Zone 1 having no heat days and Zone 12 averaging 210 heat days. Plants can then be described not only on the basis of the coldest hardiness zone in which they will sur­vive, but the warmest heat zone that they can tolerate without injury.

A few texts on heat zone gardening are beginning to appear, and their number is predicted to increase in the next few years. An increas­ing number of plants, especially herbaceous species, are coded for their heat tolerances, giving recognition to the role that heat plays in plant survival. A plant that has been rated for both cold hardiness and heat tolerance will be given four numbers. For example, the plant might be identified by its name followed by a 4-7 and 12-1. The first two num­bers identify the cold hardiness zones in which it will survive, Zones 4 through 7 and the second two numbers indicate that it is heat tolerant in Zones 12 through 1. However, ratings for cold and heat tolerances will always be generalizations, so it is wise to avoid selecting plants that are at the limits of their tolerance range. Hardiness Zone Maps may be purchased from the USDA and Heat Zone Maps are available from the American Horticultural Society through their website at http://www .ahs. org. Also available for purchase from the AHS is their paperback book, The AHS Great Plant Guide, that assigns hardiness zone ratings to more than 3,000 plants.

HORTICULTURE

Selecting the Correct Lighting

In summary, no single recipe for correct lighting can be given. There will be varied settings, needs, and objectives to accommodate. Plants will seldom be the only consideration in the …

Natural Light

Most important of all light sources for interior plantscapes is natural sunlight when it can be planned for and depended on. Each footcandle of illumination that nature provides is one …

Light Quality

Once acclimatized to the reduced light intensity of the interior, the plantscape may still prove unsatisfactory if the light quality is incorrect. Light quality is the color of light emitted …

Как с нами связаться:

Украина:
г.Александрия
тел./факс +38 05235  77193 Бухгалтерия

+38 050 457 13 30 — Рашид - продажи новинок
e-mail: msd@msd.com.ua
Схема проезда к производственному офису:
Схема проезда к МСД

Партнеры МСД

Контакты для заказов оборудования:

Внимание! На этом сайте большинство материалов - техническая литература в помощь предпринимателю. Так же большинство производственного оборудования сегодня не актуально. Уточнить можно по почте: Эл. почта: msd@msd.com.ua

+38 050 512 1194 Александр
- телефон для консультаций и заказов спец.оборудования, дробилок, уловителей, дражираторов, гереторных насосов и инженерных решений.