Straw biomass charcoal activated and modified by composite sodium selenite and used for soil improvement agent and preparation method of straw biomass charcoal

Abstract

The invention discloses straw biomass charcoal activated and modified by composite sodium selenite and used for a soil improvement agent. The straw biomass charcoal is prepared from the following raw materials in parts by weight: 86-88 parts of wheat straws, 12-14 parts of tobacco straws, 2.8-3.1 parts of calcium chloride, 1.9-2.3 parts of sodium selenite, 0.7-0.9 part of potassium permanganate, 2.2-2.5 parts of polyethylene glycol, 5-7 parts of coal ash, 6-8 parts of bone meal, 2-4 parts of lime nitrogen, 3-5 parts of orange peel oil, 0.1-0.2 part of sophocarpidine, 0.2-0.4 part of naphthylacetic acid, a proper amount of sodium hydroxide solution with concentration being 10wt.%, a proper amount of mixed acid liquor, and a proper amount of deionized water. The straw biomass charcoal prepared can be used for remarkably increasing content of selenium in soil while used for the soil improvement agent, is greatly beneficial for selenium-rich crops, can be used to remarkably save water and reduce drought resisting cost, and is excellent in water absorption, water storage and water retention capacity.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a straw biochar for a soil conditioner activated and modified by compound sodium selenite and a preparation method thereof. Background technique [0002] Crop straw is a valuable renewable resource, but due to the influence of consumption concepts, lifestyles and agricultural production time for a long time, crop straw resources are completely in a state of high consumption, high pollution, and low output. Some of the crop straws are discarded or burned, and have not been rationally developed and utilized, which not only causes serious waste of resources, but also causes serious environmental pollution, causing serious harm to human health and safety, and has become a major social problem. For this reason, the relevant state departments have done a lot of work and adopted management measures to ban straw burning, but the symptoms are not cured. Therefore, the comprehe...

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Problems solved by technology

[0004] However, the modification methods in the literature are relatively single, and the function is also single. The prepared biochar only has a good adsorption effect on the unused phosphorus in the soil. However, with the rapid development of modern industrialization, a large amount of industrial wastewater is discharged blindly. Into the farmland, and excessive use of large doses of chemical fertilizers, a large number of enrichment of heavy metal ions in the soil affects the growth of crops, and also indirectly affects human health. The effect is poor, and the effect of rooting, water and fertilizer conservation as a soil improver is also poor, so the existing process needs to be improved