Root System And Ratooning Peculiarity Research Of Lespedeza Bicolor Turcz

As a Leguminosae forage with high ratooning ability Lespedeza bicolor Turcz. have high economic value. In order to explode and use Lespedeza, the thesis is divided into three main parts: root system growth and development research of Lespedeze bicolor Turcz., effect of cutting frequency on root system and aboveground part biomass and effect of cutting and germinating on endogenous hormone of root system. Use method of container to observe developed characteristic of root system. Use method of container to study effects of cutting frequency on root system and aboveground part biomass .Use Gc/Ms-SIM to study effects IAA . ABA in root system and stem. Study shows: ?Radicle growth tend to experience three growth process: slow-quick-slow. During the course of root system growing, augment tendency of main root is inapparent, flank root distribute in the middle or upper parts of main roots. Weight of flank root 70 percent is total root weight. 〢ccording to aboveground part biomass, a cutting interval of six weeks and three-time cutting can obtain maximum aboveground part biomass and maximum occurred over-compensatory growth in a year. The research proves that certain cutting frequency will benefit sprouting and growth of Lespedeza bicolor Turcz. (3) During the germination and growth of the ratooning buds, contents of ABA. IAA decrease to lower level. In the root content of ABA. IAA occur a peak. The time for the peak of IAA's contents appears after that of ABA's. The research proves that low level of IAA and ABA will benefit germination and growth of the ratooning buds.