Abstract:

Haihe plain is an important winter wheat production area of China. With the production development, the row space of winter wheat had greatly changed in the past 70 years. In early 1950’s, the prevailing row spaces as wide as more than 30cm were narrowed through simply reforming sowing implements. Adapting to the technical needs of cropping system reform and increasing density and, therefore, increasing yield, the row spaces of winter wheat reduced by about 1/2 during middle 1960’s to 1970’s than those before the first half of 1960’s, but there still existed many row spacing forms. Since 1980’s until the end of 20th century, the row spaces of winter wheat had been gradually stabled and normalized as equal or wide+narrow spaces, with mainly the average of about 20cm. Through several year transition of early 21th century, the current row spacing form has been about equal 15cm since 2007. Meanwhile, the effects of several forms of row spacing on wheat production were also studied depending on the improvement of seeders. At present, the super-narrow row space sowing technology relying on 7.5cm row space seeder, and the tridimensional uniform sowing technology relying on tridimensional uniform seeder, showed a significant effect of yield increase and were widely extended, showing good application prospects.

Key words: Haihe plain, Wheat, Row space, Affecting factors