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Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
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Those gardening in horticultural zones higher than 9 can ignore this advice, as the southernmost parts of the continental U.S., as well as Puerto Rico and Hawaii, are considered frost-free (there ...
The Wiltshire Traditional Orchards Project maps, conserves and restores traditional orchards within Wiltshire, England. [ citation needed ] An interim report from the National Trust showed that orchards had reduced in scale from approximately 95,000 hectares in the period 1892–1914, to 41,000 hectares overall in 2022. [ 17 ]
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Polyculture systems, such as intercropping or companion planting, offer more diversity and complexity within the same season or rotation. An example is the Three Sisters, the inter-planting of corn with pole beans and vining squash or pumpkins. In this system, the beans provide nitrogen; the corn provides support for the beans and a "screen ...
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