所谓“戴帽”,即小苗出土后种皮没有脱落而夹住子叶的现象。这类小苗由于子叶不能完全展开,严重影响了叶片光合作用,这种情况在夏季草花育苗时常常出现。是什么原因造成了“戴帽”现象?能采取哪些措施处理?1、种子较干瘪,不太饱满。措施:播种时太干瘪的种子淘汰不用。由于我们大多是人工播种,播时可顺便将干瘪的和色泽度较差的种子淘汰。2、花苗出土时浇水未及时跟上,空气湿度未达标准,育苗土表层过干,种皮干燥无法膨胀,从而在出土时“戴帽”。措施:播种后要保证一定的空气湿度,一般子叶出土前要多喷水,尽量使空气湿度达到最高水平,促使种皮膨胀,利于种子出土。3、播种后盖土太薄,使表土易干,种皮干燥而较难出土。这在我们播种鸡冠花时常遇 The so-called “wearing a hat”, that is, seedling unearthed after the cotyledon does not fall off the phenomenon of cotyledons. Such seedlings can not be fully expanded because of cotyledons, seriously affecting the photosynthesis of leaves, this situation often appear in the summer grass flower nursery. What causes the “wearing a hat” phenomenon? What measures can be taken to deal with? 1, the seeds are shrivered, not full. Action: Seeds that are too dry when sown are eliminated. Since most of us are sown by hand, weeds can be shunted and the seeds of poorer color can be eliminated by the way. 2, when the watermelon unearthed not timely to keep up with water, air humidity is less than the standard, nursery soil surface over dry, dry seed coat can not be expanded, so unearthed “wearing a hat.” Measures: After sowing to ensure a certain degree of air humidity, cotyledons usually more water before the eruption, try to make the air humidity to the highest level, prompting the expansion of seed coat, which will help the excavated seeds. 3, after sowing cover soil is too thin, so topsoil easy to dry, and more difficult to unearthed seed coat. This is often encountered when we sow cockscomb