Flowering And Fruit Habits And Seedling Salt-tolerance Evaluation Of Caragana Intermedia Kuang

Orthogonal experiment of Caragana intermedia Kuang on pest control and study on its flowering and fruit habits were carried out in Wuzhai ,Shanxi from March to August,2004, and test about preliminarily appraising Salt tolerance in the seedling stages of caragana plants from different areas were carried out in Insititute of Animal Sciences,Chinese Academy of Agricultural Sciences from September to December,2004. The study indicated that: 1) Caragana intermedia Kuang is a male and female plant(most pollination mode is allogamy), and begin to bloom at the early May. And florescence intensity peak after four days around, then florescence intensity drops gradually. And one has about 20 days in clump florescence, and 3～6 days after flowering is the peak of florescence. One blooms around the clock, and the intensity is not high to bloom at night, but the peak is generally at 12-14 o'clock in every day's florescence. And florescence intensity has certain correlation to bloom with temperature and humidity. 2) In the pod and seed forming process, the contents of protein , coarse fibre and crude ash in the seed are reducing constantly, the content of crude fat the seed is rising constantly, the weight of the seed is the highest on July 18(74 days after flowering), fresh and dry weight of a thousand seed is the highest on July 20(76 days after flowering).Length, width, thickness of pod and seed appear to correlated with date, and their significance is remarkable(a=0.01). From flower openning to seed riping need 74～79　days,72～77　days　after flowering peak days is suitable harvest period, the seed reaped at this time is relatively high in output, the vigor of the seed is better too. 3) The study indicated that spraying date is the most influential factors in pest control; pesticide kinds take second place, and control effect of Fenvalerate and 40% Phoxim is more effect than other pesticides'; control effect of different pesticide concentration is not significant. 4)Caragana intermedia Kuang from Tongliao,the Inner Mongol belong to strong salt-tolerant type, Caragana intermedia Kuang from Helin and Daqi,the Inner Mongol ,and Wuzhai,Shanxi , and Caragana korshinskii Kom from Dengkou, Inner Mongol are belong to medium salt-tolerant type.