汉中地区位于北纬32度至34度之间,北有高大的秦岭横亘,南有宽厚的巴山对峙,地形为—东部敞开的盆地。大部分稻作区为亚热带湿润气候,稻麦两熟。水稻是本区主要高产作物,面积占粮食作物的三分之一,产量超过粮食总产的一半,占有举足轻重的地位。纵观三十年来的单产变化可以看出,随着科学种田的水平不断提高,趋势产量(指通过各阶段平均产量的一条回归直 Hanzhong is located between latitudes 32 degrees and 34 degrees north. There are tall northern Qinling Mountains to the north, and broad and generous Bashan mountains to the south. The terrain is an open basin in the east. Most of the paddy area is humid subtropical climate, rice and wheat two cooked. Rice is the main high-yield crop in the region, accounting for one-third of the total food crop and producing more than half of the total grain output, occupying a pivotal position. Looking at the changes in yields over the past 30 years, we can see that as the level of scientific farming continues to increase, the trend of output (referring to the regression of average yield through stages