Straw biochar-based soil phosphorus active conditioner and preparation method thereof

Abstract

The invention discloses a straw biochar-based soil phosphorus active conditioner and a preparation method thereof, and belongs to the technical field of agriculture. The straw biochar-based soil phosphorus active conditioner comprises, in parts by weight, acid-modified straw biochar 40-60 parts, an chelating agent 10-15 parts, a phosphorus-releasing bacteria agent 5-10 parts, an acidifying agent 10-15 parts and a filler 5-10 parts. The conditioner controls the adsorption-desorption performance of straw biochar on phosphorus at an appropriate level to meet the demand of crops for phosphorus, balances the fixation and activation of soil phosphorus, and prevents the risk of phosphorus leaching and releasing while meeting the needs of crops, and has good economic, environmental and ecologicalbenefits.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a straw biochar-based soil phosphorus activity conditioner and a preparation method thereof. Background technique [0002] Phosphate rock is the main source of phosphate fertilizer, and it is also a non-renewable resource. Phosphorus fertilizer plays an important role in the growth and development of crops. However, due to the low utilization rate of phosphorus fertilizer, in order to meet the nutrient needs of crops, a large amount of phosphorus fertilizer needs to be applied for a long time. Most of the phosphorus fertilizer is fixed in the soil, forming insoluble phosphorus compounds, and the fertilizer effect is difficult to exert. Therefore, it is of great significance to research and develop a soil phosphorus active conditioner that can not only prevent the fixation of phosphorus fertilizer, but also gradually activate the soil fixed phosphorus. [0003] The research...

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Problems solved by technology

But at the same time, there are also some problems, such as the ineffective application effect on farmland, the large-scale application of organic fertilizers in successive years may cause secondary pollution, the difficulty of colonizing microbial agents in the soil, and the short period of action, etc.

[0004] At present, the development of carbon-based fertilizers or soil conditioners using biochar as a substrate has become the main direction of biochar fertilization application, but there are still many problems to be solved in the development of biochar-based soil phosphorus active conditioners, for example, biochar The properties are not suitable for the soil environment. Biochar is generally alkaline, and it is easy to cause nutrient loss, passivation and denaturation when used as a fertilizer substrate. At the same time, due to different carbonization processes, different temperatures, oxygen and residence times have different effects on the adsorption performance of biochar. Larger, too high or too low is not conducive to the slow release of fertilizers, so that it cannot be used by crops in a timely manner; biochar has a strong adsorption and fixation effect on phosphorus, and its adsorption capacity is unstable, which is not conducive to crop absorption, so it needs to be modified.