Posté le: Ven Nov 22, 2013 10:18 amFalse. Earth orbit is approaching perihelion its closest distance from the sun in early January. In fact, the earth is about 3 million miles closer to the sun now than in early July. Our seasons are caused by the planet axial tilt, which currently positions the sun most direct rays over the southern hemisphere. At the winter solstice, the northern hemisphere continues to lose more incoming solar energy than it receives, which is why winter coldest days still lie ahead.
In the middle of the winter, temperatures might go slightly higher than freezing point. In these instances, your grape vines might think that spring is nearing, and the vines will be cued to start de hardening. This can make them susceptible to any sudden temperature drops, though. What you can do is keep the temperatures more or less constant. Burying the trunks of your vineyard in hills or mounds of earth ensures a more or less constant temperature. At the very least, your grafts are protected from cold air from the surface.
[url=http://mucu.jp/topics/moncler.html ]?????? ??[/url]
[url=http://mucu.jp/topics/moncler.html ]??????[/url]
- Diffamation ou insultes
- Spam ou arnaque
- Troll
- Hors sujet
Alerter