Straw biologic black charcoal soil treating method for decreasing discharge of nitrous oxide in farmland

A soil treatment and nitrous oxide technology, applied in chemical instruments and methods, soil preparation methods, soil conditioning materials, etc., to achieve the effects of reducing N2O emissions, strong adsorption, and promoting crop growth

Inactive Publication Date: 2012-01-11
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This invention solves the N2O emissions to improve the agronomic efficiency of nitrogen fertilizers

Method used

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  • Straw biologic black charcoal soil treating method for decreasing discharge of nitrous oxide in farmland
  • Straw biologic black charcoal soil treating method for decreasing discharge of nitrous oxide in farmland
  • Straw biologic black charcoal soil treating method for decreasing discharge of nitrous oxide in farmland

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Collect wheat stalks, rice stalks or corn stalks, air-dry or air-dry to make the water content less than 20%; then put them into a pool-type oxygen-limited pyrolysis carbonization furnace or a vertical kiln-type oxygen-limited pyrolysis carbonization furnace at 300-500°C Carbonize to obtain bio-black carbon, then grind, sieve, and mix and homogenize to obtain bio-black with a particle diameter of <0.25 mm;

Embodiment 2

[0025] Dry land of Huanghuaihai Plain:

[0026] Test treatment, choose embodiment 1 to prepare the biological black carbon of particle diameter-1 (denoted as C1, C2) 2 treatments, in order to test the application of biological black carbon to reduce N 2 O effect, another treatment without black carbon (denoted as C0), and nitrogen (N0) and nitrogen (N1) at the same time, the amount is 300 kg N ha -1 , the fertilizer is urea, of which 60% is used as base fertilizer and 40% is used as topdressing), a total of 6 treatments, the experiment was repeated 3 times, a total of 18 plots were arranged in random blocks, and the area of ​​a single plot was 20 m 2 .

[0027] Agronomic management of each plot is the same as for local production.

[0028] Corn cultivation management: corn (Zhengdan 958) was sown on June 17, 2010, and harvested on September 26, 2010. The basal fertilizer also included 75 kg P in all treatments 2 o 5 ha -1 of calcium dihydrogen phosphate and 90 kg K 2 O...

Embodiment 3

[0034] Rice fields in the Taihu Plain:

[0035] Test treatment: choose embodiment 1 to prepare bio-black carbon with a particle diameter of -1 (Denoted as C1, C2, C3) 3 treatments, in order to test the application of bio-black carbon to reduce N 2 O effect, another treatment without black carbon (C0), and nitrogen (N0) and nitrogen (N1) at the same time, the dosage is 300 kg N ha -1 , the fertilizer is urea, of which 40% is used as basal fertilizer, 40% is used as tiller fertilizer, and 20% is used as ear fertilizer); a total of 8 treatments, each with 3 repetitions, a total of 24 plots, with a single plot area of ​​20m 2 , random block arrangement. Agronomic management of each plot is the same as for local production.

[0036] Rice cultivation and management: Rice (Wuyunjing 7) was transplanted on June 13, 2009, seedling fertilizer was applied on June 16, tillering fertilizer and ear fertilizer were applied on August 5 and August 25, respectively. The basal fertilizer also...

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Abstract

The invention discloses a method for restraining the discharge of nitrous oxide in a farmland, and the method is applicable to a paddy field and a dry land. The method comprises the following steps of: 1) production of biologic black charcoal by thermally cracking straws: collecting the straws of farm crops, atmospherically drying or airing the straws so that the moisture content of the straws is lower than 20%, thermally cracking and carbonizing the straws to obtain the biologic black charcoal, then grinding the biologic black charcoal, sieving the ground biologic black charcoal, and mixing and homogenizing the sieved biologic black charcoal to obtain the biologic black charcoal with particle diameters being smaller than 0.25 mm; and 2) soil treatment by virtue of the biologic black charcoal: after the preceding crops are harvested, uniformly spreading the biologic black charcoal on the surface of soil, plowing and harrowing the soil so that the biologic black charcoal is uniformly mixed in the soil of a plough layer, for the paddy field, after the soil treatment, irrigating and flooding water for 2-5 cm, transplanting paddies after 3-5 days, directly planting the crops in the dry land, and in the management measures of the farmland, keeping irrigation, fertilization and plant protection consistent with the management of a local farmland. By virtue of field observation in the growth period of the crops, the discharge of the N2O (nitrous oxide) in the soil in the paddy fields in the Taihu plain and the dry lands in the Huang-Huai-Hai plain for the crops such as the paddies, corns and the like can be respectively reduced by 31%-58% and 11%-42%.

Description

technical field [0001] The invention relates to a method for significantly suppressing the emission of nitrous oxide from farmland by using agricultural straw bio-black carbon, and belongs to the technical field of greenhouse gas emission reduction and resource recycling. Background technique [0002] Nitrous oxide is a major greenhouse gas, and its warming potential per molecule is 298 times that of carbon dioxide on a time scale of 100 years [Forster, P., Ramaswamy, V., Artaxo, P., et al. 2007. Changes in atmospheric constituents and in radiative forcing. In: Solomon, S., Qin, D., Manning, M., et al. (Eds.), Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK and New York, NY, pp. 130–234]. agricultural source N 2 O emissions mainly come from farmland nitrogen fertilizers and application of poultry manure, accounting for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B77/00A01B79/02C09K17/02C09K101/00
Inventor 张阿凤潘根兴刘玉明李恋卿张旭辉郑金伟
Owner NANJING AGRICULTURAL UNIVERSITY
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