A Study on the Characteristics of Myrica rubra in Nodulation and Nitrogen Fixation

The seedling growth increment,nodulation increment and nitrogen fixationactivity of Myrica rubra(Lour)Sieb et Zucc cultured in four kinds of soil have been measured.The result is A:garden soilB:red soil+sand(proportion 2:1)C:sand+gardensoil(proportion 10 :1)D:red soil.Three testing factors mentioned above for A are 31.687 g/plant,1.789y/plant and 3.420μmol C2H4/(g fresh nodules·h)respectively;for B:20.501 g/plant,1.638g/plant and 3.252 μmol C2H4/(g fresh nodules·h);for C:18.327g/plant,6.654g/plant and 1.973μmol C2H4/(g fresh nodules·h);for D:8.322g/plant,0.333 g/plant and 1.315 μmol C2H4/(g fresh nodules·h).When applying lime (CaO),15g/pot,in the red soil to adjust its pH in the range of 5.4～6.0, the seedling growth,nodulation and nitrogen fixation activity are the highest,they are 18.524 g/plant,1.182 g/plantand 2.524μmol C2H4/(g fresh nodules·h)respectively.Sufficient water supplement is alsoimportant,especially for nodulation increment which rises to 3.519 g/plant;The seasonaldynamic curve shows that there are two peaks in a year for nodule nitrogen fixing activity,one is in June and the other is in October,January is the lowest period.There are also twopeaks for the daily variation of nodule nitrogen fixing activity,one is at noon,the other inthe midnight.