论文部分内容阅读
北方冬麦区包括甘肃、陕西、山东、山西、河北、辽南、苏北、皖北、北京、天津等八个省(市)和地区。本区是我国主要产麦区之一,冬小麦面积占全国冬麦面积的三分之一以上。北方冬麦区地域广阔,自北纬32度到41度左右,东部临海,海拔0—200公尺;西临嘉峪关,海拔2000余公尺。年平均温度10—15℃,无霜期160—200天左右。年降雨量500—1000公厘以上,由于分布不匀,常出现春旱、秋涝和晚收又旱的现象。本区栽培品种主要为黄土高原生态类型及华北平原生态类型。包括强冬性、冬性、弱冬性品种,光敏感程度由西向东逐渐减弱,光照阶段随
The northern winter wheat area includes Gansu, Shaanxi, Shandong, Shanxi, Hebei, southern Liaoning, northern Jiangsu, northern Anhui, Beijing, Tianjin and other eight provinces (cities) and regions. This area is one of the main producing areas in China. The area of winter wheat accounts for more than one third of the total area of winter wheat in China. The northern winter wheat area is vast, from north latitude 32 degrees to 41 degrees east of the sea, 0-200 meters above sea level; west of Jiayuguan, more than 2000 meters above sea level. The average annual temperature of 10-15 ℃, frost-free period of about 160-200 days. Annual rainfall above 500-1000 mm, due to uneven distribution, often spring drought, autumn flood and late harvest and drought phenomenon. The cultivation varieties in this area are mainly the ecological types of the Loess Plateau and the ecological types of the North China Plain. Including strong winter, winter, weak winter varieties, light sensitivity gradually weakened from west to east, with the light stage