Soil improvement method for improving alkalinity of acid soil

An acid soil and soil improvement technology, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of unstable soil pH, long time required, dead seedlings, etc., to avoid root burning phenomenon, Long-lasting, mild and stable effect

Active Publication Date: 2014-10-08
SICHUAN ACAD OF CHINESE MEDICINE SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practice, it has been found that since calcium superphosphate, calcium magnesium phosphate fertilizer, etc. are water-insoluble or slightly soluble components, they need to be applied to the soil in advance, and rely on natural conditions such as long-term rain to slowly decompose into alkaline substances to change the soil pH, which takes a long time. And the pH of the soil is not stable
The quicklime reacts with water to form calcium hydroxide, which not only makes the pH of the local soil ≥ 10, exceeding the pH range allowed by the normal growth of plants, but also releases a large amount of heat when quicklime reacts with water to form calcium hydroxide. Therefore, such as Wang Xiaoyu et al.’s research report in "Chinese Fruits and Vegetables" also pointed out that when quicklime is used as an amendment to improve acidified soil, the phenomenon of burnt seedlings and dead seedlings will appear locally after the application of quicklime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Flower pot experiment: set up 4 treatment groups, respectively:

[0020] ①Blank group: without adding any modifier;

[0021] ② Quicklime group: the addition amount is 6g / kg (soil);

[0022] ③ Superphosphate group: the addition amount is 2 g / kg (soil);

[0023] ④ Buffer solution group: apply the buffer solution with a pH value of 7.0 prepared with phosphorus and potassium fertilizers and sodium hydroxide in the above table 1, and the dosage is 250ml / kg (soil) (equivalent to about 5 L / m 2 ).

[0024] Experimental soil: collected in Aoping Town, Pengzhou City, Sichuan Province. First, the collected soil was air-dried to remove impurities and mixed evenly, and the original pH value was measured to be 5.52. Then put the above soil into flowerpots at 8kg / pot, add the modifiers of groups ②~④ respectively, then add water to each pot to 70% of the field water holding capacity, and cultivate at 25±1℃ for 60 days, every 3 days at least Weighing method replenishes evaporated w...

Embodiment 2

[0029] Field test with buffer application: the test land area is about 28.2m 2 , divided into 4 plots: the blank group, and the others are treatment groups. 30 days before the planting of Chuanxiong, in the planting soil with the original pH value of 6.04, press 750kg / hm 2 Apply quicklime and mix evenly; start 30 days after the Rhizoma Chuanxiong is planted, and water the phosphate buffer solution with pH 6.5 and pH values ​​7.0 and 7.4 in Table 1 respectively to the plots of each treatment group within 6 months. 5.3L / m 2 , labeled as buffer 1 group, buffer 2 group and buffer 3 group, respectively. Table 3 shows the change results of soil pH value measured at different times.

[0030] Wherein, the composition of the pH6.5 phosphate buffer is as follows: take 0.68g of potassium dihydrogen phosphate, add 15.2ml of 0.1mol / L sodium hydroxide solution, and dilute to 100ml with water to obtain; the phosphate buffer (pH7.0 ): Take 0.68g of potassium dihydrogen phosphate, add 29.1...

Embodiment 3

[0035] Tests on plant damage by applying different soil amendments: A typical acidic Rhizoma Chuanxiong planting soil was selected in Aoping Town, Pengzhou City, Sichuan Province for field experiments, and 3 treatments were set up, namely:

[0036] ① Blank group: without adding any modifier;

[0037] ② Quicklime group: Before the Rhizoma Chuanxiong was planted, the facing area was about 28.2m 2 2.12kg of lime (equivalent to 750 kg / hm 2 amount), turn the ground and mix;

[0038] ③ The present invention uses quicklime+buffer solution group: 30 days before the Rhizoma Chuanxiong is planted, press 750kg / hm in the soil with the original pH value of 6.04 2 Apply quicklime in proportion and mix; start 15 days after planting Ligusticum chuanxiong, and spread to an area of ​​about 28.2 m per month 2 Add 150L of buffer solution (equivalent to 5.3L / m 2 dosage). Calculate the emergence rate of Rhizoma Chuanxiong after emergence.

[0039] Experimental result: 1 month statistics dead ...

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PUM

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Abstract

The invention relates to a soil improvement method for improving alkalinity of acid soil. The method comprises the step of applying a buffer solution by way of being mixed with planter soil in a period shorter than or equal to 30 days after planting, wherein the pH value of the buffer solution is 5-9 and the buffer solution consists of acceptable components in agriculture. The better way of applying the buffer solution is to match in use with already adopted alkaline soil improvers including quick lime. Experiments display that the method provided by the invention can make the pH value of the soil after application stable and can effectively avoid phenomena of burned and dead seedlings.

Description

technical field [0001] The invention relates to a soil improvement method for increasing the alkalinity of acidic soil, which is especially suitable for but not limited to the method for improving soil for the purpose of passivating heavy metal pollution including cadmium. Background technique [0002] Heavy metals including cadmium (Cd) are a class of accumulative highly toxic elements that can enter the human body through the food chain and cause damage to many organs and systems including the lungs, liver, kidneys, bones, immune system, and reproductive system. A range of hazards, leading to a variety of diseases such as cancer, pulmonary edema, diabetes, bone disease and end-stage renal disease. With the rapid development of industry and the increase of industrial "three wastes" discharge, heavy metal pollution such as cadmium in soil has become one of the important environmental problems, which has attracted widespread attention from society and researchers. [0003] T...

Claims

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Application Information

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IPC IPC(8): C09K17/02C09K17/06C09K109/00
Inventor 陈幸李青苗李彬郭俊霞宁梓君杨江何春杨
Owner SICHUAN ACAD OF CHINESE MEDICINE SCI
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