CN1258660A - Fertilizer for saline-alkaline land and its production process - Google Patents
Fertilizer for saline-alkaline land and its production process Download PDFInfo
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- CN1258660A CN1258660A CN 99117393 CN99117393A CN1258660A CN 1258660 A CN1258660 A CN 1258660A CN 99117393 CN99117393 CN 99117393 CN 99117393 A CN99117393 A CN 99117393A CN 1258660 A CN1258660 A CN 1258660A
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- compound
- rare earth
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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Abstract
The production process of the fertilizer includes the steps of crushing phosphate rock, ball milling, mixing with sulfuric acid, reaction and curing. In the steps of ball milling and/or mixing and/or reaction steps, rare earth compound, calcium compound and/or magnesium compound are added. The fertilizer thus produced, when applied to saline alkaline land, has excellent effects of improving soil, raising yield of fruits, improving quality of fruits and raising resistance of crops.
Description
The method that the present invention relates to fertilizer for saline-alkaline field and produce this fertilizer.
Saline soil distributes very wide, relate to five continents, the world, more or less a hundred countries and regions from the torrid zone to the frigid zone are according to the incomplete statistics of WHO and food and agricultural organization, about 1,000,000,000 hectares of whole world saline soil area has very big potentiality to developing comprehensive agricultural.In China, north reaches the oceanfront in Guangxi, Guangdong, all archipelagos in Hainan Island and the West Coast, Taiwan and the South Sea in the south from Liaodong Peninsula, and roughly along the length and breadth of land to the north of one line of one Himalayas, one Bayan Har, one Danggula Mountains, one Qinling Mountains, Huaihe River semiarid, the arid and unconcerned condition band, all physical features are low flat relatively and ground and run in depth compile, slow area occurs, nearly all be distributed with various types of saline soil.In ploughing in the farming district, there is not next all kinds saline soil of hundred million mu of total value.This shows that the potentiality that reasonably develop salt marsh land resources have very important production meaning in national economy.
Saline soil contains too much solubility salt, they can increase the osmotic pressure of the soil solution and cause that plant produces physiological drought, influence plant growth, and the soil colloid in the alkaline earth is adsorbed with the exchangeable sodium of remarkable quantity, increase the basicity of soil and worsen soil physical properties, crop is injured.For this reason, the measure that people the time take at transformation salinity soil mainly comprises aspect two: use the water conservancy groove and impose and get rid of salinity too much in the soil and in the accumulation on the face of land, for plant is created normal soil for growth environment; On the other hand, the measure of utilization agro-ecology improves physics, chemistry and the biological property of soil, improves its fertility and suppresses the soil accumulation of salt in the surface soil, promptly replenishes and improve the semi-invariant of the soil organism and plant nutrient, to reach the purpose that improvement utilizes salt marsh.
People improve in utilization agro-ecology measure and have carried out some explorations aspect saline-alkali soil physics, chemistry and the biological property, disclose a kind of compound fertilizer special for rice in saline-alkali field as CN1106407011.This composite fertilizer is made up of urea, ammonium nitrate or sulphur ammonium, primary ammonium phosphate or ammonium hydrogen phosphate or general calcium, gypsum breeze or phosphogypsum, furfural dregs and zinc sulfate.Although this fertilizer has certain effect, be difficult to fundamentally improve the character of saline-alkali soil.
Number of research projects proves that rare earth element has special effect to the sprouting of plant seed and the growth of root; The proper concn rare earth element can promote plant to nutrient absorbing, conversion and utilization; Prove that also rare earth element has tangible influence to photosynthesis of plants; Rare earth element can strengthen resistance and the disease resistance of crop, and therefore, rare earth can not only improve the output of crop, can also improve its quality.
The applicant is surprised to find, rare-earth compound and chemical fertilizer are organically combined use, in the saltings, can give play to unexpected effect, not only can obtain higher yield of crops, and can also improve physics, chemistry and the biological property of saline-alkali soil.
This discovery has constituted basis of the present invention.
Therefore, the object of the present invention is to provide a kind of fertilizer (being commonly called as saline and alkaline spirit) that is used for the saltings.
Another object of the present invention is to provide a kind of production method of above-mentioned fertilizer.
The present invention realizes like this by add the various raw materials of rare earth compound in existing general calcium Production Flow Chart:
The production method of the fertilizer that a kind of saltings is used, this method comprises Rock Phosphate (72Min BPL) fragmentation, ball milling, mixes, changes into and maturation stage with sulfuric acid, it is characterized in that ball milling and/or mix and/change into and add rare earth compound, calcium cpd and/or magnesium compound in the step
Described rare earth compound is mixed rare earth compound or single rare earth compound, can be mishmetal mineral compound or organic compound, single rare earth mineral compound or organic compound, rare earth chloride, nitrate, vitriol, carbonate or acetate specifically, Lanthanum trichloride, lanthanum nitrate, lanthanum sulfat or Phosbloc, perhaps Cerium II Chloride, cerous nitrate, cerous sulfate, cerous carbonate, lanthanum acetate or cerous acetate more specifically; Described rare earth compound can also be mixed rare-earth oxide or single rare earth oxide compound, specifically is lanthanum trioxide or cerium oxide etc.
Preferably, rare earth compound is a mixed rare earth compound, specifically rare earth nitrate, vitriol, carbonate, mixed rare-earth oxide or single rare earth oxide compound.
More preferably, rare earth compound is rare earth nitrate, mixed rare-earth oxide or single rare earth oxide compound.
Described calcium cpd is inorganic calcium compound or organic calcium compound, as calcium oxide, calcium chloride, nitrocalcite, lime carbonate or Wingdale, calcium sulfate, calcium hydroxide or calcium acetate.
Preferably, described calcium cpd is the inorganic calcium compound, specifically nitrocalcite, lime carbonate, calcium sulfate or calcium chloride.
More preferably calcium cpd is lime carbonate or nitrocalcite.
Described magnesium compound is inorganic magnesium compound or organo-magnesium compound, specifically magnesium oxide, magnesium chloride, magnesium nitrate, magnesiumcarbonate, sal epsom, magnesium hydroxide or magnesium acetate.
Preferably, described magnesium compound is inorganic magnesium compound, specifically magnesium nitrate, magnesiumcarbonate, sal epsom or magnesium chloride.
More preferably, magnesium compound is magnesiumcarbonate or magnesium nitrate.
The add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.16-2.5%, 1.5-4.0%, 1.5-4.0%.
Preferably, the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.16-1.6%, 1.5-3.2%, 1.5-3.2%.
More preferably, the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.2-1.4%, 1.5-2.4%, 1.5-2.4%.
A kind of fertilizer that adopts method for preparing is characterized in that this fertilizer contains in by weight of fertilizer phosphorus (with P
2O
5Expression) be 12%-18%, rare earth (in oxide compound) is 0.10%-0.80%.
Embodiment of the present invention will be described in detail belows.
The present invention utilizes sulfuric acid decomposing phosphate rock stone and rare-earth compound manufacturing to contain the phosphate fertilizer of rare earth element.
Rock Phosphate (72Min BPL) is (with P
2O
5The meter phosphorus content is 28%-35%) at first through fragmentation, control size is delivered to storage hopper below 30 millimeters, adds the water wet-milling by feeding machine by certain speed goal grinding machine, and it is about ore pulp more than 28% that Rock Phosphate (72Min BPL) is worn into water content.Ore pulp after the grinding enters vibratory screening apparatus from the overflow of grinding machine afterbody, tails over macrobead and returns grinding machine, and ore pulp that sieves and concentration are that 93% to 98% vitriol oil measures mixedization of inflow chamber, back respectively.Sulfuric acid and Rock Phosphate (72Min BPL) are the liquid-solid two-phase reaction, and be just fast more, safe more as the thin more reaction of ore powder, can shorten mixing like this, change into and the curing time, can obtain higher transformation efficiency.Too thick as mineral dust, decompose not exclusively because of the package action of calcium sulfate makes ore, yet the meticulous throughput that must reduce disintegrating apparatus of breeze increases the production cost of power consumption and breeze simultaneously, therefore, should control the Rock Phosphate (72Min BPL) granularity during grinding is that 100 orders account for 90-95%.Per 100 weight part Rock Phosphate (72Min BPL) need add 50-60 weight part 93-98% sulfuric acid.
Described sulfuric acid generally is industrial sulphuric acid, but also can use as a large amount of sulfur waste acid of discharging in other chemical engineering processes, so not only can reduce the production cost of this phosphate fertilizer, all right utilize resources synthetically and minimizing environmental pollution, contain in the spent acid the deleterious impurity of farm crop but must control, can not adopt as the foreign matter content higher position, low for foreign matter content and spent acid that sulfuric acid concentration is also low can get up to use with the industrial sulphuric acid fusion.
Rock Phosphate (72Min BPL) slurry and sulfuric acid mixing 1-2 minute are sent into behind the mixing again and are changed into the chamber, and material is the normally 0.5-1 hour residence time in changing into the chamber.Material change into indoor temperature can be up to 110-130 ℃, reduce temperature and help the monocalcium phosphate crystallization, therefore the time of changing into can not be oversize.
The material that is drawn off by the chamber of changing into enters ripe storehouse again, its temperature of charge is 80-90 ℃, and the material curing temperature should decompose complexity according to Rock Phosphate (72Min BPL), and foreign matter content and processing condition thereof are determined, common curing temperature is 30-80 ℃, low excessively as curing temperature, make speed of response slow, moisture evaporation reduces, curing time must be prolonged, obviously be disadvantageous, therefore, need usually to carry out turning according to curing temperature.
Slaking early stage, free acid descends and transformation efficiency improves than very fast, and later gradual slow is constant substantially at last, common curing time 7-10 days.
In above-mentioned the inventive method, rare earth compound, calcium cpd can and/or mix and/or change in the step with magnesium compound and add at ball milling.
Described rare earth compound is mixed rare earth compound or single rare earth compound, can be the mineral compound or the organic compound of mishmetal mineral compound or organic compound, single rare earth, rare earth chloride, nitrate, vitriol, carbonate or acetate specifically, more specifically or Lanthanum trichloride, lanthanum nitrate, lanthanum sulfat or Phosbloc, perhaps Cerium II Chloride, cerous nitrate, cerous sulfate, cerous carbonate, lanthanum acetate or cerous acetate; Described rare earth compound can also be mixed rare-earth oxide or single rare earth oxide compound, specifically is lanthanum trioxide or cerium oxide etc.
Preferably, rare earth compound is a mixed rare earth compound, specifically rare earth nitrate, vitriol, carbonate, mixed rare-earth oxide or single rare earth oxide compound.
More preferably, rare earth compound is rare earth nitrate, mixed rare-earth oxide or single rare earth oxide compound.
Described calcium cpd is inorganic calcium compound or organic calcium compound, as calcium oxide, calcium chloride, nitrocalcite, lime carbonate or Wingdale, calcium sulfate, calcium hydroxide or calcium acetate.
Preferably, described calcium cpd is the inorganic calcium compound, specifically nitrocalcite, lime carbonate, calcium sulfate or calcium chloride.
More preferably be lime carbonate or nitrocalcite.
Described magnesium compound is inorganic magnesium compound or organo-magnesium compound, specifically magnesium oxide, magnesium chloride, magnesium nitrate, magnesiumcarbonate, sal epsom, magnesium hydroxide or magnesium acetate.
Preferably, described magnesium compound is inorganic magnesium compound, specifically magnesium nitrate, magnesiumcarbonate, sal epsom or magnesium chloride.
More preferably, magnesium compound is magnesiumcarbonate or magnesium nitrate.
The add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.16-2.5%, 1.5-4.0%, 1.5-4.0%.
Preferably, the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.16-1.6%, 1.5-3.2%, 1.5-3.2%.
More preferably, the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.2-1.4%, 1.5-2.4%, 1.5-2.4%.
A kind of fertilizer that adopts method for preparing is characterized in that this fertilizer contains in by weight of fertilizer phosphorus (P
2O
5Meter) 12%-18%, rare earth element (in oxide compound): 0.1%-0.8%
The equipment that uses in fertiliser production of the present invention all is the equipment that normal superphosphate production is used.
The present invention has following positively effect:
1, fertilizer of the present invention through in North China, ground tests such as northeast, Ningxia, Xinjiang, application effect is excellent on the saltings.Compare with U.S.'s phosphorus ammonium of equivalence, cotton, the comparison of oily certain herbaceous plants with big flowers cash crop amount of increase in production are according to high more than 50%, and the comparison of food crop output amounts of increase in production such as corn, paddy rice, wheat is according to doubling, and vegetable and fruit is higher.Compare with general calcium, also have same effect.
2, fertilizer of the present invention has the active effect of improving the soil.Confirm through the test of a large amount of saltingss; after using fertilizer of the present invention; crop root is flourishing especially; compare with general calcium with the phosphorus ammonium; the root of the crop amount can increase 1-2 doubly, because a large amount of organism of root system secretion, rhizospheric microorganism is very active; with the naked eye can observe a large amount of mycelium of appearance in the soil, and contrast fertilizer is to be difficult to find.Therefore, use after the fertilizer of the present invention, soil property is soft, and organic and microorganism rolls up, and has improved soil fertility like this, has improved physics, chemistry and the biological property of soil.
3, on the saltings, use fertilizer of the present invention and can promote the crop root prosperity, also strengthened the photosynthesis of crop, the crop plant growth is strong, compare with phosphorus ammonium, general calcium, the plant mean height is more than 20%, therefore crop has very strong resistivity for the poor environment of arid, high temperature, low temperature, saline and alkaline, disease and pest and so on, has promptly improved the resistance of crop.
4, on the saltings, use confirmation through various places, use the quality that fertilizer of the present invention can improve fruit.As make the V of apple
CThe content total sugar content increases, and can promote fruit color and precocity, but more than 15 days, the quality (as protein content) of corn is improved as the strawberry premature ripening, and output improves.
Below in conjunction with implementing to illustrate in greater detail the present invention
Embodiment 1
At first take by weighing 1 ton of P
2O
5Content is the Rock Phosphate (72Min BPL) of 28% (weight), normally used crusher is crushed to Rock Phosphate (72Min BPL) below 30 millimeters in the industry of employing phosphate fertilizer, deliver to storage hopper, add ball mill by feeding machine and add the water wet-milling, its amount of water is so that Rock Phosphate (72Min BPL) ore pulp water content is 28% (weight), grind the back ore pulp and enter vibratory screening apparatus from the overflow of grinding machine afterbody, tail over macrobead and return grinding machine, the ore grain size that sieves reaches 100 orders and accounts for 95%.The ore pulp that sieves is that 98% sulfuric acid enters mixedization chamber with concentration again, and the sulfuric acid add-on is 580 kilogram of 98% sulfuric acid, adds 3.6 kilograms of rare earth chlorides, 36 kilograms of nitrocalcite and 36 kilograms of magnesium nitrates simultaneously.
The Rock Phosphate (72Min BPL) slurry mixed with sulfuric acid 1 minute, sent into behind the mixing again and changed into the chamber, and material residence time in changing into the chamber is 0.5 hour.Material can reach 110 ℃ changing into indoor temperature.
The material that is drawn off by the chamber of changing into enters the slaking storehouse again, adopts the method for turning to make its temperature of charge remain on 80 ℃, and the curing time is 8 days.So just made product of the present invention.Through chemical analysis, this product is phosphorous (with P
2O
5Meter) be that 15.2% (weight), rare earth element (in oxide compound) are 0.10% (weight).
Field test results shows through the saltings, compare with phosphorus ammonium of equal value, and from the paddy rice growing way, paddy rice seedling plant height mean height 21%, from output, the amount of increase in production comparison when using fertilizer of the present invention is according to high by 104%.
Embodiment 2
This embodiment implementation step is identical with embodiment, but is to use 8.0 kilograms of rare earth nitrate compounds, 80 kilograms of lime carbonate and 80 kilograms of magnesium nitrates.
Through chemical analysis, this product is phosphorous (with P
2O
5Meter) be that 16.0% (weight), rare earth element (in oxide compound) are 0.15% (weight).
Through the saltings field test, the result shows, compares with phosphorus ammonium of equal value, and from the corn growing way, the corn individual plant on average increases 20%, from output, uses fertilizer amount of increase in production comparison of the present invention according to high by 101%.
Embodiment 3
This embodiment implementation step is identical with embodiment, but is to use 10.0 kilograms of sulfuric acid rare earth compounds, 150 kilograms of calcium chloride and 150 kilograms of magnesium oxide.
Through chemical analysis, this product is phosphorous (with P
2O
5Meter) be that 15.5% (weight), rare earth element (in oxide compound) are 0.21% (weight).
Through the saltings field test, the result shows, compares with the general calcium of equivalence, and the comparison of wheat increase yield amplitude is according to high by 101%.In addition, protein content also is significantly improved in the wheat.
Embodiment 4
This embodiment implementation step is identical with embodiment 1.But be to use 16.0 kilograms of carbonated rare earth compounds, 240 kilograms of calcium oxide and 240 kilograms of magnesium acetates.In addition, the sulfuric acid add-on is 1 ton of P
2O
5Content be the Rock Phosphate (72Min BPL) of 28% (weight) be 580 public affairs in 98% sulfuric acid, its residence time in changing into the chamber is 0.9 hour, the curing time is 10 days, the product that makes like this, through chemical analysis, this product is phosphorous (with P
2O
5Meter) be that 14.7% (weight), rare earth element (in oxide compound) are 0.44% (weight).
Through the saltings field test, the result shows, compares with the general calcium of equivalence, and the comparison of vegetables amount of increase in production is according to high by 140%.
Embodiment 5
This embodiment implementation step is identical with embodiment 1, but is to use 25 kilograms of acetic acid rare earth compounds, 250 kilograms of calcium sulfate and 250 kilograms of magnesium chlorides.In addition, the sulfuric acid add-on is 1 ton of P
2O
5The Rock Phosphate (72Min BPL) of content 28% (weight) is 580 kilogram of 98% sulfuric acid, and its residence time in changing into the chamber is 1 hour, and the curing time is 10 days, the product that makes like this, and through chemical analysis, this product is phosphorous (with P
2O
5Meter) be that 14.0% (weight), rare earth element (in oxide compound) are 0.38% (weight).
Field test results shows through the saltings, compares with the phosphorus ammonium of equivalence, and the comparison of wheat increase yield amplitude is according to high by 95%.
Claims (9)
1, a kind of production method of fertilizer for saline-alkaline field, this method comprises Rock Phosphate (72Min BPL) fragmentation, ball milling, mix, change into and maturation stage with sulfuric acid, it is characterized in that in ball milling and/or mixing and/or change into adding rare earth compound, calcium cpd and/or magnesium compound in the step
Described rare earth compound is mishmetal mineral compound or organic compound, single rare earth mineral compound or organic compound,
The add-on of described rare earth compound, calcium cpd and magnesium compound is respectively 0.16-2.5%, 1.5-4.0% and 1.5-4.0% in ore weight.
2, method according to claim 1 is characterized in that described rare earth compound is rare earth chloride, nitrate, vitriol, carbonate, acetate, mixed rare-earth oxide and single rare earth oxide compound.
3, method according to claim 1 is characterized in that described rare earth compound is rare earth nitrate, vitriol, carbonate, mixed rare-earth oxide and single rare earth oxide compound.
4, method according to claim 1 is characterized in that described rare earth compound is Lanthanum trichloride, lanthanum nitrate, lanthanum sulfat, Phosbloc, Cerium II Chloride, cerous nitrate, cerous sulfate, cerous carbonate, lanthanum acetate or cerous acetate, lanthanum trioxide or cerium oxide.
5, method according to claim 1 is characterized in that described calcium cpd is calcium oxide, nitrocalcite, calcium sulfate, calcium chloride, lime carbonate or Wingdale, calcium hydroxide or calcium acetate.
6, method according to claim 1 is characterized in that described magnesium compound is magnesium oxide, magnesium chloride, magnesium nitrate, magnesiumcarbonate, sal epsom, magnesium hydroxide or magnesium acetate.
7, method according to claim 1 is characterized in that, the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.16-1.6%, 1.5-3.2%, 1.5-3.2%.
8, method according to claim 1 is characterized in that the add-on of described rare earth compound, calcium cpd and magnesium compound is respectively in Rock Phosphate (72Min BPL) weight: 0.2-1.4%, 1.5-2.4%, 1.5-2.4%.
9, the fertilizer of producing according to the described method of claim 1-8 is characterized in that this fertilizer contains in by weight of fertilizer phosphorus (P
2O
5Meter) 12%-18%, rare earth element (in oxide compound): 0.10%-0.80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117393 CN1125795C (en) | 1999-11-30 | 1999-11-30 | Fertilizer for saline-alkaline land and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117393 CN1125795C (en) | 1999-11-30 | 1999-11-30 | Fertilizer for saline-alkaline land and its production process |
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| Publication Number | Publication Date |
|---|---|
| CN1258660A true CN1258660A (en) | 2000-07-05 |
| CN1125795C CN1125795C (en) | 2003-10-29 |
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ID=5280023
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99117393 Expired - Fee Related CN1125795C (en) | 1999-11-30 | 1999-11-30 | Fertilizer for saline-alkaline land and its production process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503719A (en) * | 2011-10-13 | 2012-06-20 | 贵州川恒化工有限责任公司 | Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil |
| CN104174633A (en) * | 2014-08-06 | 2014-12-03 | 许盛英 | Acidified lime residue |
| CN104876726A (en) * | 2015-05-19 | 2015-09-02 | 潍坊友容实业有限公司 | Fertilizer containing rare earth elements for saline-alkali soil and application thereof in pond cypress planting |
| CN105038808A (en) * | 2015-07-09 | 2015-11-11 | 潍坊友容实业有限公司 | Sandy soil saline-alkali soil structure conditioning method with moire stone soil deep loosening agent |
| CN112195028A (en) * | 2020-09-30 | 2021-01-08 | 鞍钢集团矿业有限公司 | Alkalized rice soil composite modifier and improvement method |
-
1999
- 1999-11-30 CN CN 99117393 patent/CN1125795C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503719A (en) * | 2011-10-13 | 2012-06-20 | 贵州川恒化工有限责任公司 | Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil |
| CN102503719B (en) * | 2011-10-13 | 2013-07-31 | 贵州川恒化工有限责任公司 | Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil |
| CN104174633A (en) * | 2014-08-06 | 2014-12-03 | 许盛英 | Acidified lime residue |
| CN104174633B (en) * | 2014-08-06 | 2016-06-08 | 许盛英 | Lime residue after acidifying |
| CN104876726A (en) * | 2015-05-19 | 2015-09-02 | 潍坊友容实业有限公司 | Fertilizer containing rare earth elements for saline-alkali soil and application thereof in pond cypress planting |
| CN105038808A (en) * | 2015-07-09 | 2015-11-11 | 潍坊友容实业有限公司 | Sandy soil saline-alkali soil structure conditioning method with moire stone soil deep loosening agent |
| CN112195028A (en) * | 2020-09-30 | 2021-01-08 | 鞍钢集团矿业有限公司 | Alkalized rice soil composite modifier and improvement method |
| CN112195028B (en) * | 2020-09-30 | 2022-01-11 | 鞍钢集团矿业有限公司 | Alkalized rice soil composite modifier and improvement method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1125795C (en) | 2003-10-29 |
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