A biological nitrogen and carbon-based sustained release preparation

The present invention relates to a biological carbon-based slow release nitrogen fertilizer and its preparation method, the slow release nitrogen fertilizer biochar group, the following components parts by mass of the composition: 45 parts parts biochar -55, -55 parts 45 parts Nitrogen . The preparation method comprises the steps of: biochar and nitrogen was ground and mixed uniformly biochar nitrogen and pulverized, heated nitrogen to melt and the melted into the porous biochar nitrogen under pressure structure, to obtain a uniformly mixed granulated slow release nitrogen fertilizer biochar group, wherein the pressurized pressure of 0.1Mpa-0.15Mpa. The method of the present invention enables the preparation of fertilizer into the porous structure of the bio-char having good release effect, the advantage of a long release time, while achieving a waste recycling, avoids contamination of the coating material produced in the soil may be applied to field crops, vegetable, fruit trees fertilization, with good quality and efficiency effect.