Effects of Yield and Analysis under Conditions of Precision Seeding of Small Sowing Amount for the Winter Wheat DS No.1

In order to study effects of yield under conditions of precision seeding of small sowing amount for winter wheat, the autumn-sown experiments in two years were conducted from 2001 to 2003 in Beijing. The highest yield of DS No.1 came to 6 836.25 kg/hm 2 in sowing amount of 22.5 kg/hm 2 seeds in two experimental years.The yield of some repeat experimental plots surpassed 7500kg/hm 2.Experimental varieties had a normal expressions of growth and development in growth period. Content of total saccharide, proline and lysine came to higher level in seedling of wheat.Rate of net photosynthesis, rate of transpiration, RS, COND and CINT in flag leaves showed that plants had vigorous physiological functions.Higher reactiveness of nitrate reductase and SOD showed that plants had stronger metabolism reactiveness. The number of spike per plant among yield structure for experimental varieties was more than that of general varieties. Selection of varieties and sowing amount were a prerequisite and key to the precision seeding of small sowing amount.