论文部分内容阅读
塑料大棚秋番茄延后栽培,限于塑料薄膜导热性强,保温性能差的影响,遇到-2～-3℃的低温,则单层棚内喜温性蔬菜便会受到冻害的威胁。因此就北京地区的自然气侯资源来讲,立冬(11月7—8日)为单层大棚果菜类栽培的终止期;北京地区的秋播季节夏至～小暑是天气最炎热的一个阶段昼夜温差小,持续高温,接着就进入雨季,又处在高温,高湿阶段,秋番茄病毒病严重,直到处暑(8月22—24日)以后,一般年景,天气才渐凉爽,晴天多光照充足,是秋番茄生长和发育的良好时期,但只有一个多月。进入寒露(10月8—9日)以后,光照的强度逐渐减弱,日照时间逐渐减少,很不利于番茄的生长和发育。特别是当棚内开始保
Plastic greenhouse autumn tomato delayed cultivation, limited to the plastic sheet thermal conductivity, poor insulation effect, encountered -2 ~ -3 ℃ low temperature, then the single shed shed Wenxi vegetables will be frostbite threat. Therefore, in respect of the natural climate resources in Beijing, Lubei (Nov. 7-8) is the end of fruit and vegetable cultivation in single-storey greenhouses. The autumn solstice season in summer in Beijing is one of the hottest phases of the day. Small, sustained high temperature, then into the rainy season, but also in the high temperature, high humidity stage, autumn tomato virus disease is serious, until the summer heat (August 22-24) later, the general years, the weather gets cooler, sunny and plenty of sunshine , Is a good time for autumn tomato growth and development, but only more than a month. After entering the cold dew (October 8-9), the light intensity gradually weakened, sunshine time gradually reduced, it is not conducive to tomato growth and development. Especially when the shed began to protect