云湖牌“氮源”菌肥是一种共生性广谱生物固氮菌剂 ,是从自然界采集固氮活性强的菌种进行筛选、诱变、组合、复壮培养而成 ,克服了固氮菌对寄主的专一性。据资料介绍 ,在各种主要作物上施用该菌肥 ,可在减少氮素化肥 15 %～ 30 %的情况下 ,确保作物增产 7%～ 30 %。为探讨、验 Cloud Lake brand “nitrogen source” is a symbiotic bactericide of biological broad-spectrum biological nitrogen fixation agents, is from the natural collection of nitrogen-fixing activity of bacteria for screening, mutagenesis, combination, rejuvenation culture to overcome the nitrogen-fixing bacteria on the host Specificity. According to the introduction of information, applying the bacterial fertilizer on various major crops can ensure a crop increase of 7% -30% under the condition of reducing 15% -30% of nitrogenous fertilizer. To explore, test