山东省是我国主要产棉省之一,其棉区大部集中在黄河冲积土平原,土质多属沙质壤土,棉区年平均雨量为649.3毫米,年平均溫度为12.6℃,无霜期为200天左右,自然条件适于植棉。农民从长期的棉花栽培中,积累了丰富的經驗。在防止棉花蕾鈴脫落方面,如及时打頂心,打边心,抹耳子等,对减少蕾鈴脫落都有很好的效果。但由于山东省降雨量分布不够均匀,往往造成春 Shandong Province is one of the major cotton producing provinces in China. Most of its cotton areas are concentrated in the alluvial plain of the Yellow River. The soil is mostly sandy loam. The average annual rainfall in the cotton area is 649.3 mm, the annual average temperature is 12.6 ° C, and the frost-free period is 200 days About natural conditions suitable for cotton. Farmers from the long-term cotton cultivation, has accumulated rich experience. In preventing cotton buds off, such as timely top-hitter, hit the edge of the heart, wipe ears, etc., to reduce the fall off the bell has a very good effect. However, the distribution of rainfall in Shandong Province is not uniform enough, often resulting in spring