二年生白花草木樨是我国北方重要的绿肥品种.它的根系发达,茎叶繁茂,产量高,固氮能力强,改土肥田效果显著.但是,在草木樨的利用上,特别是根茬还田上还存在不少问题.各地由于试验条件的不同,所得的结论和看法亦不同.有的认为一年根茬还田与二年根茬还田肥效差不多;有的则认为草木樨的固氮作用主要在第二年花期,利用一年根茬还田作用不大. The perennial white flowers Muxiong is an important green manure variety in the north of our country.It has developed root system, lush stems and leaves, high yield, strong ability of nitrogen fixation, soil improvement effect is remarkable.However, in the utilization of the grass mulberry, especially the stubble There are many problems around the different test conditions, the conclusions and views obtained are also different.Some think that a year of stubble return to field and two years of stubble return fertilizer almost the same; Flowering the second year, the use of a year stubble back to the field of little effect.