Organic nitrogen fertilizers - contg. immediately available and prolonged release nitrogen, from e.g. lignin material

摘要

Fertilisers contg. 15% N are produced by treatment of org. substances (esp. humus- and/or lignin-contg. material of vegetable origin) at elevated temp. and press. in a process in which an aq. suspension of the org. substances, contg. 70-95% water, is treated with ammonia, heated to the reaction temp. in a press. vessel, brought to the reaction press. by compression with pure O2, and reacted with further pure O2 until no further absorption of O2 occurs, then the end prod. is recovered by venting, evapg. and drying. The end-prod. can be used by itself as a nitrogenous fertiliser, or may be employed as a nitrogenous component of compound fertilisers. Part of its N content is ionically bound and is immediately released to plants, while the remainder of its N content is released over a prolonged period.