Great progress has been made in the project of "controlling soybean continuous cropping and reducing yield".

The reporter learned from relevant departments that the project of "research and demonstration of key technologies for controlling soybean yield reduction" invited by the Municipal Science and Technology Bureau has made significant progress after two years of scientific research.

The project was carried out in Yilan and Bayan counties with the largest soybean area in Harbin City. Through key technology research, soybean varieties Kenfeng 16, Heinong 48, Kangxian 4 and Hefeng 47 with resistance to continuous cropping were screened. The formula fertilization technology of applying nitrogen 45 kg, phosphorus 60-67.5 kg, potassium 67.5-75 kg and trace element boron 7.5 kg per hectare, foliar fertilizer spraying technology at flowering stage, The key techniques of controlling soybean yield in successive cropping were as follows: soil preparation technique of deep loosening in autumn, biological control techniques of root diseases and insect pests such as Trichoderma and biocontrol granules.

In 2006, it was demonstrated in two counties, and the yield of continuous cropping soybean increased by 9.81% and 11.4%. Under unfavorable natural conditions, the yield of continuous cropping soybean was 2348.5 kg/ha, exceeding the yield of soybean in 2006 by 691 kg/ha.

In 2007, Harbin suffered the worst drought in 50 years. This technology also achieved remarkable results. The yield of Bayan County reached 2145 kg/ha, increasing production by 13.2%. The average yield in plain area of Yilan County is 2136 kg/ha, increasing by 8.8% compared with that of other counties.

In the past two years, the cumulative area of successive crops of soybeans using this scientific research achievement has reached 21,000 hectares, increasing soybean production by 4.77 million kg, and increasing economic benefits for farmers by more than 18 million yuan.

Liu Zhongtang, a famous soybean expert of the Provincial Academy of Agricultural Sciences, believes that the "key technology for controlling soybean continuous cropping and yield reduction" is effective. It is completely possible to control soybean continuous cropping and yield reduction, and it can create higher yield, which has very important significance and better prospects for improving soybean yield in Harbin.

It is understood that Harbin is the main soybean producing area in China, more than 60% of soybean sown area is heavy crop area. In view of the problems existing in soybean production in Harbin City, such as large continuous cropping area, serious disease and insect pests, low yield and so on, the Municipal Science and Technology Bureau designed the project of "Research and Demonstration of Key Technologies for Controlling Continuous Cropping and Yield Reduction of Soybean" at the beginning of 2006. Heilongjiang Province Academy of Agricultural Sciences, Northeast Institute of Geography and Agricultural Ecology of Chinese Academy of Sciences, Harbin City Agricultural Technology Extension Service Center and other units jointly won the bid to undertake the project.