一、防干旱危害播种前,要测试种子发芽率,根据测试结果确定播种量,在苗床中浇足底水后播种或充分灌水。播种用水不能用污水、脏水,最好用地下水。播种前,苗床要遮阳保湿,根据天气情况,可在早晨或傍晚用喷壶向苗床喷少量水,防止苗床干旱。二、防高温危害苗床应通风良好,搭建遮阳棚,用遮阳网或无纺布覆盖遮阳,也可用树枝遮阳,还可在塑料薄膜上喷洒泥浆水遮阳。播种后,用稻草覆盖苗床,待有60-70%幼苗出土时去除苗床覆盖物。通过遮阳,使温度下降,透光率降低,以利于幼苗生长。三、防秧苗徒长危害秧苗徒长主要是因光照不足。光合作用弱,制造的养 First, the anti-drought hazard Before sowing, to test the seed germination rate, according to the test results to determine the sowing rate, sowing the foot of the water in the seedbed after sowing or full irrigation. Seeding water can not use sewage, dirty water, it is best to use groundwater. Before sowing, seedbed to shade moisturizing, according to the weather conditions, in the morning or evening with a watering can spray a small amount of seedbed to prevent seedbed drought. Second, the anti-high-temperature damage seedbed should be well-ventilated, build awning, covered with shade net or non-woven shade, branches can also shade, but also in the plastic film spray mud water shade. After sowing, cover the seedbed with straw until 60-70% of the seedlings are removed to remove the seedbed cover. Through the sun, so that the temperature dropped, the light transmittance decreased, in order to facilitate seedling growth. Third, the long-term anti-seedling sapling leggy mainly due to insufficient light. Photosynthesis is weak, the manufacture of support