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

A carbon-based, nitrogen fertilizer technology, applied in applications, fertilization devices, fertilizer mixtures, etc., can solve the problems of ineffective nutrient release rate control, secondary pollution, and high raw material costs, and achieve high-value ecological utilization and fertilizer utilization. The effect of improving the efficiency and lowering the production cost

Active Publication Date: 2013-09-25
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 A kind of preparation method of charcoal-based slow-release nitrogen fertilizer special for vegetable fields, comprising the following steps:

[0023] (1) After the peanut shells are air-dried, crush them and put them into a dry distillation carbonization furnace. The carbonization furnace starts at 40°C, raises the temperature to 170°C at a rate of 5°C / min, keeps it for 30 minutes, and then raises the temperature to 300°C at a rate of 5°C / min , kept for 6 hours, then cooled to room temperature, soaked in water for 9 hours, washed twice with water, dried in an oven at 105°C, and ground through a 2mm sieve to prepare biochar particles for use.

[0024] (2) Dissolve agricultural urea (with a nitrogen content of 46%) in water to make a fertilizer solution with a nitrogen content of 25%.

[0025] (3) According to the solid-to-liquid ratio of 1:10, add the above-mentioned biochar to the fertilizer solution with a nitrogen content of 25%, and place the system in ...

Embodiment 2

[0029] Embodiment 2 A preparation method of charcoal-based slow-release nitrogen fertilizer special for vegetable fields, comprising the steps of:

[0030] (1) After the peanut shells are air-dried, crush them and put them into a dry distillation carbonization furnace. The carbonization furnace starts at 40°C, raises the temperature to 170°C at a rate of 5°C / min, keeps it for 30 minutes, and then raises the temperature to 350°C at a rate of 5°C / min , kept for 6 hours, then cooled to room temperature, soaked in water for 10 hours, then rinsed with water 2 to 3 times to remove ash and impurities, dried in an oven at 85°C, and ground through a 2mm sieve to obtain biochar particles.

[0031] (2) Dissolve agricultural ammonium nitrate (35% nitrogen content) in water to make a fertilizer solution with 20% nitrogen content.

[0032] (3) According to the ratio of solid to liquid ratio of 1:8, biochar was added to the above fertilizer solution, and the system was placed in a constant t...

Embodiment 3

[0036] Embodiment 3 A kind of preparation method of charcoal-based slow-release nitrogen fertilizer special for vegetable field, comprises the steps:

[0037](1) After the peanut shells are air-dried, crush them and put them into a dry distillation carbonization furnace. The carbonization furnace starts at 40°C, raises the temperature to 170°C at a rate of 5°C / min, keeps it for 30 minutes, and then raises the temperature to 300°C at a rate of 5°C / min , kept for 6 hours, then cooled to room temperature, soaked in water for 10 hours, rinsed with water three times to remove ash and impurities, dried in an oven at 85°C, and ground through a 2mm sieve to obtain biochar particles.

[0038] (2) Ammonium sulfate for agricultural use (21% nitrogen content), dissolved in water to make a fertilizer solution with 15% nitrogen content.

[0039] (3) According to the ratio of solid to liquid 1:8, add biochar to the above fertilizer solution, and place the system in a constant temperature osc...

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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...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 张贵龙任天志杨殿林赵建宁刘红梅赖欣宋晓龙
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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