Special carbon-based slow release nitrogen fertilizer for vegetable fields and preparation method thereof

Abstract

The invention relates to a special carbon-based slow release nitrogen fertilizer for vegetable fields, which aims to solve the technical problem that the nutrient release of the existing nitrogen fertilizer is overquick. The slow release nitrogen fertilizer is prepared by taking 95-100 parts of nitrogen loaded biochar, 1-5 parts of attapulgite and 2-3 parts of calcium lignosulphonate as raw materials, stirring, drying, granulating the raw materials and the like. The special carbon-based slow release nitrogen fertilizer and the preparation method thereof disclosed by the invention have the positive beneficial effects that the nitrogen nutrient release duration is prolonged, and the coupling between nutrient release and crop demands is high, so that the leaching loss of nitrogen nutrients is lower, and the fertilizer utilization rate is improved; the slow release nitrogen fertilizer also has a function of improving the physical and chemical properties of soil of vegetable fields, and can increase the organic matter of soils and the cation exchange capacity and granular structure of soil, prevent the soil from hardening, and improve the hydrothermal condition of soil; used raw materials are wide in sources, cheap and easily available, and therefore, the slow release nitrogen fertilizer is low in production cost, and beneficial to realizing the ecological high-valued utilization of agricultural wastes.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a special charcoal-based slow-release nitrogen fertilizer for vegetable fields and a preparation method thereof. Background technique [0002] In vegetable production, the application of nitrogen fertilizer has an important impact on its yield and quality. Among them, chemical nitrogen fertilizer has the characteristics of fast fertilizer efficiency, significant yield increase effect, and convenient application, which is generally favored by vegetable farmers. In recent years, with the improvement of the intensive production of vegetables, the input ratio of chemical nitrogen fertilizers has gradually increased. However, chemical nitrogen fertilizers are rapidly transformed in the soil, nutrient release is fast, the loss rate is high, and the duration of fertilizer effects is short. In order to pursue higher returns , large and frequent application of chemical nitrogen fertilizers has...

AI Technical Summary

Problems solved by technology

[0004] At present, a series of nitrogen fertilizers with slow-release function have been developed in the world to improve the utilization efficiency of nitrogen nutrients. However, these fertilizers have high raw material costs and complicated processes, which are not conducive to large-scale promotion and application, and most of them contain polymer polymers. Material-based coating materials, most of which cannot be completely degraded, are easy to accumulate in the soil, forming "secondary pollution"

Due to the large amount of irrigation and frequent irrigation in the vegetable field, the coating material is easy to dissolve in water, and it is difficult to protect the nitrogen fertilizer, and the control effect on the release rate of the nutrient is not obvious. Therefore, it is low-cost to develop and suitable for vegetables. The environment-friendly slow-release nitrogen fertilizer has become an urgent demand in production