Study Of Main Cultivation Factors Concerning High Oil Soybean On Yield And Quality In Heilongjiang

The trials were conducted in the years 2005～2006 with high-oil soybean cultivars kennong19 , Heinong44, Suinong20 and conventional variety Heinong35(ck).The effect of different sowing dates, population density , leaf dressing, seed coating agent on the yield and the content of protein and fat were studied . The result were as fallows:The sowing date makes a great difference in soybean yield. Different strains also have quite different effects on their yield. The highest yield of Kennong 19 is 2715 .4kg/hm~2, in comparison to Hefeng 35 only 2081.3 kg/hm~2 under the optimum sowing date ,May 9. Different sowing dates make a significant difference in the content of protein and fat in soybean grains. The fat content decreased rapidly with the late sowing date ,and the protein content varies like "S" line with change of sowing date --under the first date, it increased, the second date dropped , and the third date increased again.The overview shows that the amount of protein and that of fat have an inverse relation. They are closely connected. Under the optimum population density , the highest yield of kennong 19 is 2743.8 kg/hm~2 and Hefeng 35(ck) is 2216.5 kg/hm~2, the popudation density with the yield for almost all cultivars is 260,000～340,000 plants/ hm~2, and 100,000 to 420,000 plants/ hm~2 for lower yield. The fat content decreased and the protein content increased in line with population density increased to 100,000-340,000 plants /hm~2. Soybean yield can be increased significantly with different foliage fertilizers and seed coating agents . Foliage fertilization can increase the yield by 2~12% and seed coating agents by 2～16% .But they have little effect on the fat and protein content in soybeans.