论文部分内容阅读
棉花育苗移栽,是利用保护地栽培的方法,将太阳能转化为热能,提高和控制环境中的温度条件,提早棉花播种期,延长有效开花期,以实现多结铃,争高产。塑料薄膜覆盖育苗,增温效果随外界温度的高低而变化。1980年以前,棉花苗床温度的调节,以盖膜增温和揭膜降温为手段,控温指标以最适光合作用温度25℃为依据。但3月底4月
Cotton seedling transplanting is the use of protective cultivation methods, the solar energy into heat to improve and control the temperature conditions in the environment, early cotton sowing period, to extend the effective flowering period, in order to achieve multi-boll, high yield. Plastic film covered nursery, the warming effect with the level of external temperature changes. Before 1980, the regulation of cotton seedbed temperature to cover film warming and uncovering film cooling as a means, temperature control index to the optimum temperature 25 ° C as the basis for photosynthesis. But the end of March April