陕南山区的浅山、丘陵山区是其最大的农耕区,其光温、土地、社会和技术等有利条件较多,但以高温干旱为主的自然灾害对玉米生产的影响较大,具体表现在早茬玉米低温缺墒、缺苗严重;回茬玉米易受高温伏旱,使玉米扬花期高温晒花,甚至植株枯死,回茬面积随之增加,受灾害性气候威胁更大。如何科学有效的利用该区有利的气象条件,因地制宜地配套先进技 The shallow mountains and hilly areas in southern Shaanxi are the largest agricultural areas with favorable conditions of light, temperature, land, society and technology. However, natural disasters mainly caused by high temperature and drought have a greater impact on maize production, Premature crop lack of moisture lack of moisture, lack of seedlings severe; stubble corn susceptible to high temperature and drought, so that the flowering of corn at high temperature, and even dead plants, stubble area increases, more threatened by disastrous climate. How to utilize the advantageous weather conditions in this area scientifically and effectively and to match the advanced technologies according to the local conditions