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Method for constructing soil of plough layer on coarse sand earth surface by heavy metal polluted sediment

A technology that pollutes sediment and heavy metals. It is applied in the direction of soil preparation methods, applications, agricultural machinery and tools, etc. It can solve the problems that affect the large amount of land used, and achieve good production increase effects, obvious effects, and reduced leachable components.

Active Publication Date: 2014-06-18
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the texture of the dredged sediment is not adjusted, it cannot be used as a medium for plant growth, affecting its large-scale use in land.

Method used

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  • Method for constructing soil of plough layer on coarse sand earth surface by heavy metal polluted sediment
  • Method for constructing soil of plough layer on coarse sand earth surface by heavy metal polluted sediment
  • Method for constructing soil of plough layer on coarse sand earth surface by heavy metal polluted sediment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 The method of constructing plow layer soil on coarse sandy surface with heavy metal polluted bottom mud

[0035] In November 2012, in Xiasi Village, Xinpo Town, Longhua District, Haikou City, Hainan Province, the surface of the coarse sandy land to be improved was loose and flat, and the standard for leveling the ground was a slope ratio ≤ 3:1000.

[0036] The dredged bottom mud from a river pond in Xinpo Town, Haikou City was naturally dehydrated and paved, and then dried and dehydrated naturally, and evenly spread on the coarse sand. The thickness of the bottom mud laying was 24cm.

[0037] Spread stabilizer evenly on the above-mentioned heavy metal contaminated bottom mud, said stabilizer includes calcium magnesium phosphate fertilizer, calcium oxide, lightly burned dolomite, the mass ratio of the three corresponding is 5:5:2, and every 100 parts by weight of bottom mud is used 1 part by weight of stabilizer.

[0038] On the ground sprinkled with stabilize...

Embodiment 2

[0043] Embodiment 2 Application of plow layer soil obtained by the present invention on crop planting

[0044] On the plow layer soil obtained by the method of the present invention from the bottom mud in Example 1, water spinach (produced respectively from Thailand's Gundam Seed Co., Ltd. and Beijing Golden Land Agricultural Technology Research Institute) and dry crop edamame were planted according to conventional methods. At the same time, 0.3% lime + 0.3% calcium magnesium phosphate fertilizer was used as a stabilizer to stabilize the test plow layer soil, and the plow layer soil covered with unstabilized bottom mud was used as a comparison. Physiological indicators and growth indicators are recorded during crop growth, yield is recorded when harvested, and heavy metal content detection is carried out on vegetables and soybeans.

[0045] As a result, the physiological indicators and growth indicators of vegetables planted in the bottom mud after treatment are better than th...

Embodiment 3

[0050] Example 3 The application of the plow layer soil pH adjustment constructed by the present invention

[0051] In Example 1, the bottom mud was stabilized according to the present invention to construct the plow layer soil, and water spinach (produced by Thailand Gundam Seed Co., Ltd.) was planted according to the conventional method. At the same time, 0.3% lime + 0.3% calcium magnesium phosphate fertilizer was used as a stabilizer to stabilize the plow layer soil (but no green manure treatment was planted in this treatment), and the local natural farmland soil was used as a comparison. The adjustment effects of soil mechanical composition (Table 3) and fertility conditions (Table 4) were monitored after planting crops in different soil treatments.

[0052] Table 3 Adjustment effect of different stabilization treatments on soil mechanical composition of plow layer (unit: %)

[0053]

[0054]

[0055] As can be seen from the adjustment data of the field test soil me...

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Abstract

The invention discloses a method for constructing soil of a plough layer on a coarse sand earth surface by heavy metal polluted sediment. The method comprises the following steps of step 1), loosening the coarse sand surface to be regulated, and levelling the ground; step 2), laying the heavy metal polluted sediment on the coarse sand surface; step 3), sprinkling stabilizers on the heavy metal polluted sediment; step 4), performing rotary tillage for the first time; step 5), performing dry-wet alternating treatment for 15 days, and exposing to the sun for 7 days, and then performing rotary tillage for the second time, wherein the rotary tillage direction is opposite to that of the second time; after rotary tillage, the water mass fraction of a mixture of the sediment, the coarse sand and the stabilizers is naturally reduced to be 25-30%, performing alternating treatment and rotary tillage for the third time, wherein the rotary tillage direction is vertical to that of the second time; step 6), after performing rotary tillage for the third time, planting leguminous green manure for one crop, performing rotary tillage for the fourth time and returning the green manure to the field, and after two months, obtaining the soil of the plough layer. The heavy metal stabilization effect of the soil of the plough layer obtained by the method is obvious, and the heavy metal content of the planted vegetable crops conforms to the national standard.

Description

technical field [0001] The invention belongs to the field of land improvement engineering, and in particular relates to a method for constructing plow layer soil on a coarse sand surface with heavy metal polluted bottom mud. Background technique [0002] Land remediation is an activity to improve the efficiency of land use by renovating land that is inefficiently used, irrationally used, unused, and damaged by production and construction activities and natural disasters; important means of productivity. Among them, the requirements for the cultivated layer soil in the land improvement project are particularly high, that is, the quality of the cultivated land after the improvement is at least one level higher than the quality of the cultivated land before the improvement. The specific indicators are that the thickness of the remediation soil layer is more than 15-20cm, the nutrients are complete, the organic matter is rich, the aggregate structure is good, the soil environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02
Inventor 刘永兵李翔吴军巴特尔洪文良贾斌吴光辉程言君许杰峰张琼
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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