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Selection and Breeding of Brachiaria ruziziensis G.et E.cv. Reyan No.15

BAI Chang-jun,LIU Guo-dao*,WANG Dong-jin,YU Dao-geng,CHEN Zhi-quan,LI Zhi-dan (Tropical Pasture Research Center,Tropical Crops Genetic Resources Institute,CATAS,Danzhou,Hainan 571737,China)  
Brachiaria ruziziensis G.et E.cv.Reyan No.15 was native in African and firstly introduced from CIAT in 1991.Its ecological adaptability was then evaluated in 1992-1994 in greenhouse and field.Later,the comparative trial,regional trial and productive trial were carried out during 1994-1996,1999-2004,and 1999-2005,respectively.The preliminary results show that B.ruziziensis G. E.cv.Reyan No.15 had a high forage dry matter yield of 209865.83 kg/hm2·a,very significantly higher(54.43%) than that of B.brizantha cv.Reyan 6 and significanty higher(43.76%) than that of B.decumbens cv.Reyan 3,respectively.It was adaptable to the warm and tropical climate with altitude range from 1000 m to 2000 m,reasonably high annual rainfall of morn than 1000 mm,and could endure hot dry spells morn than 5 months.It required a soil of high fertility and could tolerate acid soils,especially in pH 4.5~5.0.It was suitable for natural pasture improvement,establishment of high yield and good quality grazing pasture,and also for the water and soil erosion control.
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