我地位于秦岭南麓中段深山地区，又处凉亚热带向暖温带过渡地段，总的概貌是：九山半水半分田。版图辽阔，地形复杂，气候差异较大，因为水稻是感光性敏感的作物，而种植多分布在海拔高度３４４～１２９８m地区，相差８００多m，活动积温在２００℃左右。如何因地制宜选用品种 I am located in the middle of the southern foot of the Qinling Mountains in the mountains, but also cool subtropical transitional warm temperate zone, the general profile is: Jiushan semi-sub-half-field. Large territory, complex terrain, climate differences, because rice is sensitive to sensitive crops, and planting more distributed in the altitude 344 ~ 1298m area, a difference of more than 800 m, the active accumulated temperature at about 200 ℃. How to choose the appropriate local varieties