一、深坑育苗优点1冬暖夏凉。深坑苗床与地面苗床相比较，冬季日平均气温高1℃～15℃，地温高2℃．夏天相反，气温低地～15℃，地温低2℃，这样减小了冬季保温的难度；夏季也不易发生烧苗现象。而在气候适官育苗的春秋两季，深坑苗床与地面苗床的气温、地温基本一致。深坑苗氏 First, the advantages of nursery pit 1 warm winter and cool. Compared with the surface seedbed, the average daily temperature in winter is 1 ℃ ~ 15 ℃ and the ground temperature is 2 ℃. In summer, on the contrary, low temperature ~ 15 ℃, low ground temperature 2 ℃, thus reducing the difficulty of winter insulation; summer is not prone to burning seedling phenomenon. In the spring and autumn seasons, the temperature and ground temperature of the seedling bed on the deep pit and the ground were basically the same. Deep pit Miao