Saline-alkali soil improver as well as preparation method and application thereof

Abstract

The invention discloses a saline-alkali soil improver as well as a preparation method and application thereof, and relates to the technical field of solid waste resource utilization and soil environment treatment. The preparation method of the saline-alkali soil improver comprises the following steps: drying, crushing, pyrolyzing and condensing straws to prepare pyrolysis liquid; uniformly mixing the pyrolysis liquid with an ammonium sulfate solution and ethanol in parts by weight to prepare a mixed solution; and performing ultrasonic treatment and centrifugation on the mixed solution to obtain the modifier. The saline-alkali soil conditioner can effectively improve the physicochemical properties of saline-alkali soil, increase the content of total organic matters, quick-acting nitrogen, phosphorus and potassium in the soil, improve the activity of enzymes in the soil and effectively reduce the alkalinity of the saline-alkali soil.

Description

technical field

[0001] The invention relates to the technical fields of solid waste resource utilization and soil environment treatment, in particular to a saline-alkali soil improver and its preparation method and application. Background technique

[0002] The high salinity, high alkalinity and low nutrient element content of saline-alkali soil are not conducive to plant growth, so improving and repairing it can increase crop yield. Chemical improvement measures are effective, simple, and effective. However, the application of amendments may cause secondary pollution to the environment. It is necessary to develop greener saline-alkali soil amendments.

[0003] As agricultural waste, cotton stalks have not been rationally utilized. Straw pyrolysis liquid accounts for about 1 / 3 of the product, the source is green, rich in organic matter, often acidic, but it is also rich in phenols and other substances that are unfavorable to plant growth.

[0004] N is an essential nutrien...

Examples

preparation example Construction

[0030] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0031] Step S1: drying, pulverizing, pyrolyzing and condensing the straw to prepare a pyrolysis solution;

[0032] Step S2: uniformly mixing the pyrolysis solution, ammonium sulfate solution and ethanol in parts by weight to prepare a mixed solution;

[0033] Step S3: The mixture is subjected to ultrasonication and centrifugation, and the lower phase is used to obtain the improver.

[0034] In this embodiment, the stalks in the step S1 are cotton stalks.

[0035] In this embodiment, the particle size of the crushed straw in step S1 is 2-5 cm.

[0036] In this embodiment, before the pyrolysis in the step S1, nitrogen is used for purging until the reactor is filled with nitrogen.

[0037] In this embodiment, the pyrolysis temperature in the step S1 is 300-700° C., and the time is 0.5-2.5 h.

[0038] In this embodiment, the pyrolysis condens...

Embodiment 1

[0044] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0045] Step S1: Dried cotton stalks were crushed into small pieces with a particle size of 2-5 cm, pyrolyzed at 300°C for 1 hour under nitrogen-filled conditions, and condensed at 20°C to obtain a pyrolyzed solution;

[0046] Step S2: uniformly mix the above-mentioned pyrolysis solution (3 parts) with saturated ammonium sulfate solution (3 parts) and ethanol (0.5 parts) in parts by weight to prepare a mixed solution;

[0047] Step S3: Ultrasonicate the mixed solution for 20 minutes, centrifuge (6000 rpm / min) to separate layers, and remove the phase to obtain the modifier.

[0048] Dilute the above-mentioned soil improver 200 times and use it in saline-alkali soil. After 30 days of pakchoi sowing, collect soil samples for testing. , available phosphorus and available potassium increased by 33.04%, 47.56%, 97.44%, 8.54% respectively, urease, s...

Embodiment 2

[0050] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0051] Step S1: Drying the cotton stalks and crushing them into small pieces with a particle size of 2-5 cm, pyrolyzing them at 400°C for 2 hours under nitrogen-filled conditions, and condensing at 20°C to obtain a pyrolyzed solution;

[0052] Step S2: uniformly mix the above-mentioned pyrolysis solution (3 parts) with saturated ammonium sulfate solution (3 parts) and ethanol (0.5 parts) in parts by weight to prepare a mixed solution;

[0053] Step S3: Ultrasonicate the mixture for 20 minutes, centrifuge (8000 rpm / min) to separate layers, and remove the phase to obtain the modifier.

[0054] Dilute the above-mentioned soil improver 400 times and use it in saline-alkali soil. After 30 days of pakchoi sowing, collect soil samples for testing. , available phosphorus and available potassium increased by 17.02%, 7.58%, 187.88%, 9.50% respectively...

technical field

[0001] The invention relates to the technical fields of solid waste resource utilization and soil environment treatment, in particular to a saline-alkali soil improver and its preparation method and application. Background technique

[0002] The high salinity, high alkalinity and low nutrient element content of saline-alkali soil are not conducive to plant growth, so improving and repairing it can increase crop yield. Chemical improvement measures are effective, simple, and effective. However, the application of amendments may cause secondary pollution to the environment. It is necessary to develop greener saline-alkali soil amendments.

[0003] As agricultural waste, cotton stalks have not been rationally utilized. Straw pyrolysis liquid accounts for about 1 / 3 of the product, the source is green, rich in organic matter, often acidic, but it is also rich in phenols and other substances that are unfavorable to plant growth.

[0004] N is an essential nutrien...

Examples

preparation example Construction

[0030] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0031] Step S1: drying, pulverizing, pyrolyzing and condensing the straw to prepare a pyrolysis solution;

[0032] Step S2: uniformly mixing the pyrolysis solution, ammonium sulfate solution and ethanol in parts by weight to prepare a mixed solution;

[0033] Step S3: The mixture is subjected to ultrasonication and centrifugation, and the lower phase is used to obtain the improver.

[0034] In this embodiment, the stalks in the step S1 are cotton stalks.

[0035] In this embodiment, the particle size of the crushed straw in step S1 is 2-5 cm.

[0036] In this embodiment, before the pyrolysis in the step S1, nitrogen is used for purging until the reactor is filled with nitrogen.

[0037] In this embodiment, the pyrolysis temperature in the step S1 is 300-700° C., and the time is 0.5-2.5 h.

[0038] In this embodiment, the pyrolysis condens...

Embodiment 1

[0044] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0045] Step S1: Dried cotton stalks were crushed into small pieces with a particle size of 2-5 cm, pyrolyzed at 300°C for 1 hour under nitrogen-filled conditions, and condensed at 20°C to obtain a pyrolyzed solution;

[0046] Step S2: uniformly mix the above-mentioned pyrolysis solution (3 parts) with saturated ammonium sulfate solution (3 parts) and ethanol (0.5 parts) in parts by weight to prepare a mixed solution;

[0047] Step S3: Ultrasonicate the mixed solution for 20 minutes, centrifuge (6000 rpm / min) to separate layers, and remove the phase to obtain the modifier.

[0048] Dilute the above-mentioned soil improver 200 times and use it in saline-alkali soil. After 30 days of pakchoi sowing, collect soil samples for testing. , available phosphorus and available potassium increased by 33.04%, 47.56%, 97.44%, 8.54% respectively, urease, s...

Embodiment 2

[0050] The present embodiment provides a kind of preparation method of saline-alkali soil conditioner, comprising the following steps:

[0051] Step S1: Drying the cotton stalks and crushing them into small pieces with a particle size of 2-5 cm, pyrolyzing them at 400°C for 2 hours under nitrogen-filled conditions, and condensing at 20°C to obtain a pyrolyzed solution;

[0052] Step S2: uniformly mix the above-mentioned pyrolysis solution (3 parts) with saturated ammonium sulfate solution (3 parts) and ethanol (0.5 parts) in parts by weight to prepare a mixed solution;

[0053] Step S3: Ultrasonicate the mixture for 20 minutes, centrifuge (8000 rpm / min) to separate layers, and remove the phase to obtain the modifier.

[0054] Dilute the above-mentioned soil improver 400 times and use it in saline-alkali soil. After 30 days of pakchoi sowing, collect soil samples for testing. , available phosphorus and available potassium increased by 17.02%, 7.58%, 187.88%, 9.50% respectively...