CN102890138A - Method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing ion exchange resin bag - Google Patents
Method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing ion exchange resin bag Download PDFInfo
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- CN102890138A CN102890138A CN2012103611154A CN201210361115A CN102890138A CN 102890138 A CN102890138 A CN 102890138A CN 2012103611154 A CN2012103611154 A CN 2012103611154A CN 201210361115 A CN201210361115 A CN 201210361115A CN 102890138 A CN102890138 A CN 102890138A
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- Prior art keywords
- ion exchange
- exchange resin
- resin bag
- soil
- bag
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- 239000002689 soil Substances 0.000 title claims abstract description 66
- 235000015097 nutrients Nutrition 0.000 title claims abstract description 36
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003456 ion exchange resin Substances 0.000 title claims abstract description 32
- 229920003303 ion-exchange polymer Polymers 0.000 title claims abstract description 32
- 239000000126 substance Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 20
- 235000007164 Oryza sativa Nutrition 0.000 title abstract description 4
- 235000009566 rice Nutrition 0.000 title abstract description 4
- 240000007594 Oryza sativa Species 0.000 title description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000284 extract Substances 0.000 claims description 11
- 230000003064 anti-oxidating effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 241000209094 Oryza Species 0.000 abstract 2
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 12
- 241000196324 Embryophyta Species 0.000 description 6
- 230000029087 digestion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 235000021049 nutrient content Nutrition 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000001164 aluminium sulphate Substances 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 235000003715 nutritional status Nutrition 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing an ion exchange resin bag. The method comprises the following steps of: preparing 50ml of 0.5mol/L hydrochloric acid in a lab, filling hydrochloric acid into a triangular flask, and taking the triangular flask to the field for standby use; making a bag by using a non-woven fabric, packaging 1.57g of granular ion exchange resin in the bag, sealing the bag to form the ion exchange resin bag, embedding the ion exchange resin bag into the soil of a flooded rice field to be measured and standing for 2 hours, taking the ion exchange resin bag out and washing the ion exchange resin bag by using pure water, putting the ion exchange resin bag into 0.5mol/L hydrochloric acid for preventing oxidation, and taking the ion exchange resin bag back to the lab; oscillating the triangular flask in which 0.5mol/L hydrochloric acid and the ion exchange resin bag are filled in a high-capacity constant temperature shaker for 2 hours; and finally taking the ion exchange resin bag out, filtering the extraction solution in the triangular flask into a 50ml of beaker by using medium-speed filter paper, and measuring the readily available nutrients and reducing substances by using the filtered extraction solution. The method is easy and convenient to operate and rapid in measurement, and can really reflect the strength of the released readily available nutrients of the soil at a certain time period under the flooded field conditions.
Description
Technical field
The present invention relates to agricultural technology field, in particular a kind of method of utilizing the ion exchange resin bag to measure flooded paddy soil available nutrient and reducing substances.
Background technology
Soil testing comprises two aspects, and one is to extract, and another is to analyze.Select suitable extraction agent very important, still can not find so far a kind of desirable extraction agent to guarantee accuracy, current used all extraction agents be not too high be exactly that the validity of soil nutrient to plant has been assessed in the lowland.In addition, the extraction agent that extracts a certain specific nutrient element is of a great variety, is applicable to various soil, and the various places measurement result is difficult to mutual comparison.
It all is to come extraction and determination with digestion agent after adopting air-dry pedotheque usually that the conventional readily available nutrient of soil and reducing substances are measured, and the flooded paddy soil significant variation that Redox Condition occurs in air-dry process, therefore its readily available nutrient of soil and the real situation of reducing substances content and field of conventional method mensuration are widely different, often can not correctly characterize the readily available nutrient of soil and reducing substances situation under the flooding condition.Therefore, the flooded paddy soil available nutrient that conventional method of analysis is measured can not instruct the fertilising of paddy rice or other aquatic crops, this just need to work out a kind of new assay method, under the condition that does not change flooded paddy soil physics and chemistry character, extract the various readily available nutrients of soil and reducing substances, finally obtain accurately flooded paddy soil available nutrient and reducing substances content.
Ion exchange process is early than just finding in the middle of the 19th century, but first industrial application is in 1905, and what be mainly used in drinking water is softening.Research on agricultural starts from 1950's to fat in ion-exchange, is the validity of assessing plant nutrient in the soil the earliest.Great majority research concentrates on the available phosphorus that utilizes in the anion exchange resins extraction dryland soil.Also useful Zeo-karb extracts the release of exchangeable potassium in the dryland soil and research commutativity potassium.Ion exchange resin, as the soil nutrient extraction agent, have advantages of that general chemical extraction agent does not possess, it can be by ion-exchange reactions with the nutrient ionic adsorption of the soil liquid and soil surface in its surface, this process and plant roots absorb nutrient to a certain degree similarity, therefore, utilizes the ion exchange resin bag to measure the flooded paddy soil available nutrient content, the soil fertility that characterizes under the flooding condition is more accurate and feasible, and significant.
The pedotheque of prior art process comprise air-dry, impurity elimination, levigate, sieve, the operating process such as mixing, bottling preservation and registration.
(1) air-dry and impurity elimination
The soil sample of adopting back from the field, except the bright sample of specific (special) requirements, generally in time air-dry.Its method be pedotheque is placed on shady and cool dry ventilate, indoor without special gas (such as chlorine, ammonia, sulphuric dioxide etc.), free from dust pollution again, be tiled on the clean kraft after sample broken into pieces, spread out into very thin one deck, and often stir, accelerate dry.Must guard against sunlight directly tans by the sun or toasts.After soil sample is slightly dried, large clod be crumbed (especially clayed soil), in order to avoid form be difficult to behind the lump levigate.After sample is air-dry, should sort out iron-manganese concretion, lime nodule or stone etc. in dry branches and fallen leaves, plant roots, stubble, polypide and the soil, if stone is too much, it is sorted out and weighs, write down shared percentage.
(2) levigate, sieve and preserve
When carrying out physical analysis, get air-dry soil sample 100-200g, be placed on the kraft, pulverize with wooden unit, be placed in cover the end No. 18 sieves (aperture 1mm), make it the sieve by 1mm, stay soil block on the sieve and be poured on the kraft again and again mill.So repeated multiple times, until all pass through.Must not abandon or omit, but chad is sure not crushing.Chad on the sieve should be sorted out and weigh and preserve, in order to the weigh usefulness of calculating of chad.Simultaneously the soil sample of sieving is weighed, to calculate the chad percent by weight, be contained in the wide-necked bottle after the pedotheque after then will sieving fully mixes, as the usefulness of particle-size analysis of soil samples and other determination of physical appearance.
During chemical analysis, get air-dry good soil sample such as above method it is ground, and make it all by No. 18 sieves (aperture 1mm).The pedotheque of gained can be in order to measure quick-acting nutrient, pH value etc.When measuring full phosphorus, soil nutrient content, the pedotheque by No. 18 sieves further can be ground, make it all by No. 60 sieves (aperture 0.25mm).When measuring full potassium, should with all by the pedotheque of No. 100 sieves (aperture 0.149mm), analyze usefulness as it.Behind the pedotheque mixing after grinding is sieved, in the wide-necked bottle of packing into.
Existing collecting soil sample technology is fit to the dryland soil collection.Because the reductibility Nutrients in the flooded paddy soil is very easily oxidized, if the flooded paddy soil sample adopts the same procedure collection, can cause then that easily reductibility available nutrient test result is extremely inaccurate in the sample.
The strength factor of the redox of soil (oxidation-reduction potential) and quantity factor (reducing substances amount) are not only relevant but also two aspects distinguishing in the redox of soil process, soil redox status and soil nutrient status and with the relation of plant growth in, quantity factor plays an important role, measure reducing substances and can specifically represent this quantitative relation, and can disclose wherein shared proportion and the effect thereof of certain material.The aluminum sulfate solution lixiviate of soil reduction process Nutrients, leachate can be referred to as the reducing substances total amount by potassium bichromate solution oxidation person under high temperature and acidulated condition.Take aluminium sulphate as digestion agent the time, leachate under certain condition, utilize the effect of varying strength oxygenant, reducing substances can be divided into reducing substances total amount, active reduction material, ferrous iron and bivalent manganese, and can calculate active organic reducing substances.The method of this employing digestion agent test paddy field redox materials although adopt the fresh soil sample test, still can't guarantee the soil virgin state.Simultaneously, digestion agent can all extract the soil sample reducing substances, but can not accurate description soil supplies with and the relation of plant absorbing.
Summary of the invention
The present invention relates to a kind of flooded paddy soil available nutrient and reducing substances method for measuring.Technical matters to be solved by this invention: existing soil nutrient determination techniques requires and will measure after the soil sample air-dry sample preparation, soil nutrient and reducing substances total amount change to some extent under oxidizing condition, fully available nutrient and reducing substances situation under the reducing environment of actual response paddy field.Simultaneously, measure reducing substances in the existing measuring technology and adopt digestion agent to extract more, digestion agent can all extract the soil sample reducing substances, but can not the accurate description soil nutrient supplies with and the Availability of plant absorbing.
Technical scheme of the present invention is as follows:
A kind of method of utilizing the ion exchange resin bag to measure flooded paddy soil available nutrient and reducing substances is that the hydrochloric acid of 0.5mol/L packs that to bring to the field for subsequent use for triangular flask in laboratory configuration 50ml concentration; Make the growth sack with the nonwoven fabrics with high water-permeability characteristics, encapsulate 1.57g granular pattern ion exchange resin and be sealed to the ion exchange resin bag in the sack the inside, and it is imbedded flooded paddy soil 0-20cm soil layer to be measured left standstill 2 hours, then the ion exchange resin bag is taken out and put into the anti-oxidation of 0.5mol hydrochloric acid and take back the laboratory after cleaning with pure water; The triangular flask that 0.5mol/L hydrochloric acid and ion exchange resin bag are housed is placed in the large capacity temp-constant shaking table turn at 25 degrees centigrade and 150/per minute impose a condition lower vibration 2 hours-, at last the ion exchange resin bag is taken out, and the extract in the triangular flask is filled into Medium speed filter paper in the beaker of 50ml, the extract after the filtration can carry out available nutrient and reducing substances is measured.
Easy and simple to handle, measure fast, and the energy actual response goes out the intensity of soil period release available nutrient under the flooding condition of field, it is long to have solved existing flooded paddy soil available nutrient and reducing substances determination techniques activity duration, and efficient is lower, and measurement result can not be reacted the problem of actual effect.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Technical scheme main points of the present invention: at first packing at laboratory configuration 0.5mol/L 50ml hydrochloric acid, to bring to the field for subsequent use for triangular flask, secondly make the sack of growth 0.45cm, wide 0.45cm of the nonwoven fabrics with high water-permeability characteristics, at sack the inside encapsulation 1.57g granular pattern
Ion-exchangeResin also is sealed to the ion exchange resin bag, and it is imbedded flooded paddy soil 0-20cm soil layer to be measured left standstill 2 hours, then put into the anti-oxidation of 0.5mol hydrochloric acid and take back the laboratory after the taking-up of ion exchange resin bag being cleaned with pure water, the triangular flask that 0.5mol/L hydrochloric acid and ion exchange resin bag will be housed again be placed in the large capacity temp-constant shaking table with 25 degrees centigrade and 150 turn/per minute impose a condition lower vibration 2 hours-, at last the ion exchange resin bag is taken out, and the extract in the triangular flask is filled into Medium speed filter paper in the beaker of 50ml, the extract after the filtration can carry out available nutrient and reducing substances is measured.
That the present invention has is easy and simple to handle, measure fast characteristics, and the energy actual response goes out the intensity of soil period release available nutrient under the flooding condition of field, it is long to have solved existing flooded paddy soil available nutrient and reducing substances determination techniques activity duration, efficient is lower, and measurement result can not be reacted the problem of actual effect.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (1)
1. a method of utilizing the ion exchange resin bag to measure flooded paddy soil available nutrient and reducing substances is characterized in that, is that the hydrochloric acid of 0.5mol/L packs that to bring to the field for subsequent use for triangular flask in laboratory configuration 50ml concentration; Make sack with the nonwoven fabrics with high water-permeability characteristics, encapsulate 1.57g granular pattern ion exchange resin and be sealed to the ion exchange resin bag in the sack the inside, and it is imbedded flooded paddy soil 0-20cm soil layer to be measured left standstill 2 hours, then the ion exchange resin bag is taken out and put into the anti-oxidation of 0.5mol hydrochloric acid and take back the laboratory after cleaning with pure water; The triangular flask that 0.5mol/L hydrochloric acid and ion exchange resin bag are housed is placed in the large capacity temp-constant shaking table turns at 25 degrees centigrade and 150/the per minute lower vibration 2 hours that imposes a condition, at last the ion exchange resin bag is taken out, and the extract in the triangular flask is filled into Medium speed filter paper in the beaker of 50ml, the extract after the filtration can carry out available nutrient and reducing substances is measured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103611154A CN102890138A (en) | 2012-09-17 | 2012-09-17 | Method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing ion exchange resin bag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103611154A CN102890138A (en) | 2012-09-17 | 2012-09-17 | Method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing ion exchange resin bag |
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| CN102890138A true CN102890138A (en) | 2013-01-23 |
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| CN2012103611154A Pending CN102890138A (en) | 2012-09-17 | 2012-09-17 | Method for measuring readily available nutrients and reducing substances in soil of flooded rice field by utilizing ion exchange resin bag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588745A (en) * | 2016-02-25 | 2016-05-18 | 四川省农业科学院土壤肥料研究所 | Quick detecting method for soil rapidly available nutrients in submersed paddy field |
| CN105784966A (en) * | 2016-02-25 | 2016-07-20 | 四川省农业科学院土壤肥料研究所 | Method for detecting nutrients of paddy field flooding solution |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2326645B1 (en) * | 1973-05-25 | 1974-06-27 | Walter Prof. Dr. 6222 Geisenheim Tepe | Method for determining the nutrient performance of soils by electrodialysis and device for carrying out the method |
| US4816161A (en) * | 1987-11-27 | 1989-03-28 | The United States Of America As Represented By The Secretary Of Agriculture | Isopotential available ion extractor |
| CN101477091A (en) * | 2008-01-04 | 2009-07-08 | 中国科学院沈阳应用生态研究所 | In-situ monitoring method for litter decomposing soluble nutrient release amount |
| CN100559157C (en) * | 2008-01-25 | 2009-11-11 | 浙江大学 | Method for Determination of Soil Available Phosphorus Using Discarded Ion Exchange Resin Balls |
-
2012
- 2012-09-17 CN CN2012103611154A patent/CN102890138A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2326645B1 (en) * | 1973-05-25 | 1974-06-27 | Walter Prof. Dr. 6222 Geisenheim Tepe | Method for determining the nutrient performance of soils by electrodialysis and device for carrying out the method |
| US4816161A (en) * | 1987-11-27 | 1989-03-28 | The United States Of America As Represented By The Secretary Of Agriculture | Isopotential available ion extractor |
| CN101477091A (en) * | 2008-01-04 | 2009-07-08 | 中国科学院沈阳应用生态研究所 | In-situ monitoring method for litter decomposing soluble nutrient release amount |
| CN100559157C (en) * | 2008-01-25 | 2009-11-11 | 浙江大学 | Method for Determination of Soil Available Phosphorus Using Discarded Ion Exchange Resin Balls |
Non-Patent Citations (2)
| Title |
|---|
| LUNDELL Y: "In situ ion exchange resin bags to estimate forest site quality", 《PLANT AND SOIL》, vol. 119, no. 1, 30 September 1989 (1989-09-30), pages 186 - 190 * |
| 杨俞娟: "水分管理方式与供氮水平对水稻土氮素养分转化及供氮能力的影响", 《中国优秀硕士学位论文全文数据库 农业科技辑》, no. 2, 15 February 2011 (2011-02-15) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588745A (en) * | 2016-02-25 | 2016-05-18 | 四川省农业科学院土壤肥料研究所 | Quick detecting method for soil rapidly available nutrients in submersed paddy field |
| CN105784966A (en) * | 2016-02-25 | 2016-07-20 | 四川省农业科学院土壤肥料研究所 | Method for detecting nutrients of paddy field flooding solution |
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Application publication date: 20130123 |