乾县试区的气候与冬小麦产量

The Climate and Winter Wheat Yield in Qianxian County Experimental Area

收集了乾县近30年(1964～1993年)来逐年冬小麦平均产量,采用正交多项式计算方法,建立起计算乾县冬小麦产量趋势项的公式。依此算出了乾县近30年来逐年的冬小麦产量趋势项与气候产量,及乾县吴店乡、三合村全乡、全村的试区成立以来的冬小麦产量趋势项与气候产量,并找出了影响试区冬小麦产量的主要气候因子:光、热、水。其中水分供应状况在冬小麦产量上,反应十分灵敏。由此提出,在乾县试区从事种植时,应着重考虑水分的供应,按降水分布规律,安排布署种植,做好蓄水保墒、高效用水和农田基本建设等。

Information of average yield of winter wheat for nearly 30 years (1964～1993)in Qianxian County was collected year by year. The calculation method of orthogo-nal multinominal is adopted to establish the formula to calculate the yield trends of win-ter wheat in Qianxian county. Based on the formula,yield trends of winter wheat and cli-mate wheat yields in Qianxian county for nearly 30 years are calculated,and so do thosein experimental area in Wudian and Shanhe Townships since its establishment. And themain climate constraints including light, heat and water affacting wheat yields arefound,of which water supply is extremely sensitive to wheat yields. It can be concludeedfrom this that in engaging in crop plantation,water supply should be taken into account, and crop planting should be arranged in accordance with rainfall laws. At the sametime,a good job should be done on water storage, moisture conservation and efficientwater use as well as basic farmland construction,etc.