我们山东省即墨县农业技术中学研制的半地下、弧坡式太阳能地瓜育苗温床,有如下特点:1.床体大部位于地下,保温性能好。2.床内受光坡近似半圆弧形,能接受较多的直射光和辐射热,升温快。3.床上覆盖双层膜,不盖草帘,管理方便,薄膜受损少。在多云或阴天也能接受较多的散射光,提高了光能利用率。(亦可覆盖单层膜,晚上加盖草帘)。4.白天床内空气经常处于流动状态,地瓜基层温度易升高,出芽快,苗子壮。从81—84年我校及邻近乡、镇推广了200多铺大小不同规格的温床来看,在育苗的前中期,尽管气候多变仍能达到11—13天出芽,21—23天晾床,25—29天拔头茬苗。每斤地瓜种能出苗:头茬11～19株,二茬4.6—16株,百苗重320—510克(因品种 We Jimo County, Shandong Province agricultural technology developed by the semi-underground, arc slope solar sweet potato nursery hotbed, has the following characteristics: 1. The bed most of the ground, good insulation properties. 2. Bed near the light slope is approximately semicircular arc, can receive more direct light and radiant heat, warming fast. 3. Bed covered double membrane, cover straw curtain, easy management, less damage to the film. In the cloudy or cloudy can also accept more scattered light, improve the utilization of light energy. (Can also cover a single film, covered with straw curtain at night). 4. daytime bed air is often in a flow state, sweet potato grass-roots temperature is easy to rise, budding, seedling Zhuang. From 81 to 84 years, our school and its neighboring townships and townships popularized more than 200 hotplates with different sizes and specifications. In the middle and early stages of nursery, the weathering can still reach 11-13 days of emergence and 21-23 days of drying , 25-29 days first head stubble seedlings. Sweet potatoes per kilogram of seedlings can emerge: the first stubble 11 to 19 strains, the second crop of 4.6-16 strains, seedlings 320-510 grams (due to breed