长武县属渭北高原,海拔1200米,耕地37.7万亩,人均2.8亩,其中山坡地占56％,年降雨量584.8毫米,无霜期175天,基本一年一熟。六十年代年平均粮食总产5471万斤,单产146.1斤;1974—1979年年平均粮食总产8402万斤,单产274.7斤,1981年粮食总产9293万斤,单产326.3斤,比六十年代增长123.3％。但目前产量仍较低且不稳,原因很多,其中作物布局就存在一定问题,主要是:只强调粮食生产而又未因地制宜。宜种玉米的原面,改种所谓高产的高粱,瘠薄易导的山坡地不发展牧草而过多地种植粮食,川原高肥地种植晚熟早秋、晚熟晚秋和晚播 Changbei County belongs to the Weibei Plateau, with an altitude of 1,200 meters and a cultivated area of ​​377,000 mu, with a per capita population of 2.8 mu, of which 56% are hillsides, with annual rainfall of 584.8 mm and frost-free period of 175 days. The average annual grain output in the 1960s was 54.71 million kg, yielding 146.1 kg; the average annual grain output in 1974-1997 was 84.02 million kg, yielding 274.7 kg; the total grain output in 1981 was 92.93 million kg; the yield per unit area was 326.3 kg, Increase 123.3%. However, the current production is still low and unstable for many reasons. Among them, there are some problems in the layout of crops. The main problems are: only emphasis on food production has not been made to suit local conditions. Should be planted with the original corn, so-called high-yielding sorghum, barren grass-prone hillsides without the development of pasture and the excessive planting of food, high-fertile land in Chuan plain planted early late autumn, Late Late Late and Late Seeding