“天丰”牌生物固氮肥，是北京农博技术研究所所生产的，含有许多有益菌群，以根瘤菌为主，含量为３亿／ｇ。它能将空气中大量存在的非豆科植物无法转化吸收的大量的分子氮转化为铵态氮，供非豆科植物吸收，并且还具有较强的解磷、活钾和激活土壤微生物的功能。不论土壤肥力和? “Tianfeng” brand biological nitrogen fixation, is produced by the Beijing Agricultural Science and Technology Institute Bo, containing many beneficial bacteria, rhizobia-based, content of 300 million / g. It converts large amounts of molecular nitrogen that can not be converted and absorbed by a large number of non-leguminous plants in the air into ammonium nitrogen for absorption by non-legumes and also has strong functions of dissolving phosphorus, activating potassium and activating soil microorganisms . Regardless of soil fertility and?