Yield Effects in the Precision Seeding of Small Sowing Amount for Winter Wheat

The Autumn-sown experiments in the precision seeding of small sowing amount for the winter wheat in two years were conducted during 2001 - 2003 in Beijing. The best yield for the DS 1 came to 5589.0 kg/hm2 at the sowing level of 22.5 kg/hm2 seeds from 2001 to 2002. The yield of Jing 411, Lumai 21, Jinmai 73 and DS 1 came to 8537.7, 7403.7, 7353.75 and 6836.25 kg/hm2, respectively at the sowing level of 22.5kg/hm2 seeds during 2002 - 2003. Rate of net photosynthesis, rate of transpiration, RS, COND and CINT in flag leaves showed that plants had vigorous physiological functions. Higher activities of nitrate reductase and SOD showed that plants had stronger metabolism. The number of spike per plant among yield components in these cultivars was relatively high.