Study on the growth and development ability of some imported soybean varieties and cultivation techniques for prospect variety in thai nguyen

1. The favorable factors for developing the soybeanproduction in Thai Nguyen were the favorable climate conditions and the large land resource. The fact that soybean is easy to plant and its products are quickly consumed is the base for development of the soybean production in Thai Nguyen. The main disadvantaged factors in soybean production were lack of high yielding varieties that suitable with ecological area and lack of suitable 2. The comparison results of 10 varieties in two spring crops and two winter crops in 2004 and 2005 showed that there were two varieties ĐT2000 and 99084 - A28 that had the estimate yield (EY) and Actual yield (AY) significantly higher than the control variety at 95% confidence interval in all testing crops. The EY in spring crops were 2.72 and 2.78 tons/ha, 2.21 and 2.42 tons/ha in winter crops. The AY in spring crops were 2.16 and 2.24 tons/ha, 1.71 and 1.78 tons/ha in winter crops. 3. The optimum planting dates of 99084 - A28 variety in spring crop in Thai Nguyen was from 15th, Feb. to 6th, Mar. With this planting date, the EY was from 2.86 to 3.04 tons/ha; the AY was from 2.09 to 2.19 tans/ha that were higher than other periods of planting. The optimum planting dates in winter crop was from 5th, Sep. (when harvesting winter rice) to 25th, Sep. With this planting date, the EY was from 1.87 to 2.40 tons/ha and the AY was from 1.22 to 1.57 tons/ha that significant higher than other studied periods.

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