Silicon-calcium-magnesium fertilizer soil conditioner as well as preparation method and application thereof

The invention relates to a soil conditioner and a technology of silicon calcium magnesium fertilizer, which is applied in the field of silicon calcium magnesium fertilizer soil conditioner and its preparation, and can solve the problems of crop yield reduction, fertility decline, soil compaction and the like, and achieves reduction of cadmium content, low price and wide material sources. Effect

Inactive Publication Date: 2021-07-23
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the slightly alkaline soil in the north, if the soil pH is increased excessively, it wi

Method used

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  • Silicon-calcium-magnesium fertilizer soil conditioner as well as preparation method and application thereof
  • Silicon-calcium-magnesium fertilizer soil conditioner as well as preparation method and application thereof
  • Silicon-calcium-magnesium fertilizer soil conditioner as well as preparation method and application thereof

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preparation example Construction

[0026] The present invention also provides a preparation method of the above silicon-calcium-magnesium fertilizer soil conditioner, comprising the following steps: calcining dolomite, potassium feldspar and limestone at a high temperature of 1160-1200°C, and mixing them with medical stone to obtain the silicon-calcium Magnesium fertilizer soil conditioner.

[0027] After dolomite, potassium feldspar and limestone described in the present invention are through high-temperature calcining, dolomite generates MgO and CaO, and limestone generates CaO, and K in potassium feldspar 2 O·Al 2 o 3 ·6SiO2 2 reaction, and then mixed with medical stone fine powder to obtain the silicon-calcium-magnesium fertilizer soil conditioner.

[0028] The present invention also provides the application of the above-mentioned silicon-calcium-magnesium fertilizer soil conditioner or the silicon-calcium-magnesium fertilizer soil conditioner prepared by the above preparation method in the passivation o...

Embodiment 1

[0039] The preparation raw material of silicon calcium magnesium fertilizer soil conditioner comprises dolomite, potassium feldspar, limestone and medical stone, and its mass ratio is 41:36:34:30; Dolomite, potassium feldspar, limestone, medical stone are crushed , after drying, it is ground into fine powder (120 mesh >95%) by ball mill, according to the mass ratio of dolomite, potassium feldspar and limestone as 41:36:34, mix evenly and put it in muffle furnace at 1160~1200 After calcining at high temperature for 35 minutes, take it out and cool it, then grind it into fine powder (120 mesh >95%) and mix it with medical stone fine powder. Silicon calcium magnesium Fertilizer soil conditioner, pH is 10.44, total cadmium content is 0.324mg / kg, specific ingredients include: SiO 2 22%, CaO 23%, MgO 9%, K 2 O 6%, medical stone 30%.

[0040] The Si-Ca-Mg fertilizer conditioner was scanned and photographed with a scanning electron microscope energy spectrum (SEM-EDS), and the magn...

Embodiment 2

[0042] 1. Potted plant test plan

[0043] The soil to be tested is calcareous fluvo-aquic soil, 0-20cm soil in the farmland surface of the sewage irrigation area, the basic physical and chemical properties of the soil: pH is 8.24, organic matter content is 22.10g / kg, alkaline nitrogen content is 75.32mg / kg, available phosphorus content is 27.69mg / kg, the available potassium content is 134.69mg / kg, and the total cadmium content is 4.93mg / kg. The wheat variety is Womai 66, and each pot contains about 8kg of contaminated soil. Apply base fertilizer as compound fertilizer (N-P 2 o 5 -K 2 O=24-14-8), quantitative watering to maintain the relative soil moisture content of about 60%. The test has three treatments in total, and each treatment has three repetitions, which are: (1) no conditioner (CK1); (2) silicon-calcium-magnesium fertilizer soil conditioner 1.2% (G1); (3) silicon-calcium-magnesium fertilizer Soil conditioner 3% (G2); wherein % is the percentage of silicon calciu...

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Abstract

The invention provides a silicon-calcium-magnesium fertilizer soil conditioner as well as a preparation method and application thereof, and relates to the technical field of soil improvement. The raw materials of the silicon-calcium-magnesium fertilizer soil conditioner are mainly composed of dolomite, medical stone and other minerals, the materials are wide in source and low in price, and the silicon-calcium-magnesium fertilizer soil conditioner contains a large amount of silicon, calcium, magnesium, potassium and other elements and can be used as a fertilizer. The soil conditioner is applied to heavy metal pollution remediation of soil for the first time, in particular to heavy metal pollution remediation of alkalescence calcareous soil in the north. According to the embodiment of the invention, pot culture and field experiments prove that the silicon-calcium-magnesium fertilizer soil conditioner can improve the pH value of soil by 0.48-0.91 and obviously reduce the DTPA-state cadmium content of the soil; the content of exchangeable cadmium in soil and the content of cadmium in a carbonate binding state are remarkably reduced, and the content of iron and manganese oxide binding state, organic binding state and residual state cadmium is increased; and the cadmium content in each organ of the wheat is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, in particular to a silicon-calcium-magnesium fertilizer soil conditioner and its preparation method and application. Background technique [0002] Examples of soil heavy metal pollution due to the rapid development of industry and agriculture can be seen everywhere, especially the heavy metal Cd content in the soil exceeds the standard. Cadmium in the soil can be absorbed and enriched by crops, and enter the human body through the food chain, thereby posing a certain threat to human health. In addition, the biological toxicity of heavy metals and their ability to accumulate in organisms are not determined by their total amount, but by the form of heavy metals and their biological availability. Therefore, remediation of cadmium-contaminated soil, by changing the form of cadmium in the soil and reducing its mobility and availability in the soil, plays an important role in the safe product...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08
CPCB09C1/08C09K17/06
Inventor 张静静化党领杨金康柳海涛朱利楠
Owner HENAN AGRICULTURAL UNIVERSITY
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