瓜类蔬菜爱惜地育苗床如何治理(国外英文资料).docVIP

瓜类蔬菜保护地育苗床怎么管理(国外英文资料) How to manage the nursery land for cucurbit vegetables? After sowing should strengthen heat preservation, warming and moisture management, combined heating and other measures (such as multi-layer covering and plastic film smallgongpeng covered insulation materials, heating, etc.) so that the air temperature and ground temperature maintained at the optimum temperature range of 25-30 DEG C, minimum temperature 15-18 degrees centigrade, night temperature 18-20 degrees. The emergence of seedlings is strong and as soon as possible. This period is mainly to promote the emergence of seedlings, management is based on the principle of keeping warm and warming up, and generally do not ventilate. Under these conditions, most of the 3-5 days will be the emergence of seedlings. Bed temperature is the main factor affecting the emergence, the temperature is too low, prone to the phenomenon of rotten seeds. So, in the cold season of sowing, the best use of heating, heating or hotbed hotbed, temporary heating and other measures to promote the rapid emergence of seedlings is strong. 1. temperature management seedlings when excavated, the hypocotyl is very sensitive to temperature and humidity at high temperature and high humidity, will quickly form hypocotyl elongation, leggy seedlings. Shoots were unearthed after management goal is to promote the rapid development of the hypocotyl and root diameter growth, when the seedlings of Qi (cotyledon top excavated surface) timely ventilation, reduce the humidity should be maintained at around 25 degrees, 15 degrees during the day, at night. When the first leaf is expanded, it can decrease the temperature at night at 1-2 DEG C to form a larger diurnal temperature difference, and promote the strong and female flower differentiation of seedlings and prevent the elongation of hypocotyls. In case of rainy weather, the temperature should be properly reduced. Cotyledon after flattening management in order to promote the leaf