豫西南纯雨养区主要包括唐河县、社旗县、方城县等东部岗丘区和邓州市、内乡县、镇平县、卧龙区等西部丘陵区,以及南召县、淅川县、西峡县部分浅山区。土壤贫瘠、理化性状差、有机质含量低,因特殊地貌和水利条件限制,虽然小麦生育期内降雨总量在280mm左右,但年际间、时空间差异很大,多数年份和小麦生长不同步,季节性干旱是本区域小麦生产最主要的威胁,小麦产量低且不稳。长期以来该区域小麦生产上利用的品种和灌区相同,没有本区域专用品种,为了进一步提高该区域的小麦 The pure rain-fed areas in southwestern Henan mainly include Tanggou County, Sheqi County, Fangcheng County and other eastern hills and counties and Dengzhou City, Neixiang County, Zhenping County, Wolong District and other western hilly areas, as well as Nanzhao County and Xichuan County Part of Xixia County shallow mountain area. Soil physical and chemical properties are poor, organic matter content is low, due to the special landform and water conditions, although the total rainfall during the growing period of wheat is about 280mm, but very different in time and space, most of the years and wheat growth is not synchronized, Seasonal drought is the most significant threat to wheat production in the region, with low and unstable wheat yield. For a long time, the varieties used in wheat production in the region were the same as irrigated areas. There was no specific variety in the region. In order to further improve the wheat yield in the region