CN102775234A - Controlled-release zinc fertilizer and preparation method thereof - Google Patents
Controlled-release zinc fertilizer and preparation method thereof Download PDFInfo
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- CN102775234A CN102775234A CN2012102926941A CN201210292694A CN102775234A CN 102775234 A CN102775234 A CN 102775234A CN 2012102926941 A CN2012102926941 A CN 2012102926941A CN 201210292694 A CN201210292694 A CN 201210292694A CN 102775234 A CN102775234 A CN 102775234A
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Abstract
The invention relates to a controlled-release zinc fertilizer and a preparation method thereof. As for the controlled-release zinc fertilizer provided by the invention, the zinc sulfate heptahydrate, weathered coal, urea and bentonite are compounded and granulated to form a core zinc fertilizer; then the core zinc fertilizer is enveloped by the molten sulfur; finally, the zinc/sulfur-coated fertilizer is further enveloped by the modified epoxy resin material to obtain three kinds of two-layer enveloped zinc fertilizer with different envelope thicknesses; and moreover, the zinc fertilizer with different envelop thicknesses is subjected to secondary compounding so that the nutrient release time of the produced controlled-release zinc fertilizer in soil is long, the release speed is uniform, and the needs of the crops in one year can be met by once application.
Description
Technical field
The present invention relates to zinc fertilizer of a kind of sustained release and preparation method thereof, belong to release and release control fertilizer production and applied technical field.
Background technology
Zinc is not only the necessary nutritive element of growth and development of plants, also is the nutritive element of needed by human.Increasing the crop zinc content is an important channel of improving human zinc nutrition.Yet the zinc in the soil receives influence of various factors to the validity of crop, causes the plain under-nutrition of zinc, big area occurs and lacks the zinc phenomenon.According to investigations, the nationwide soil of China all shows scarce zinc, and the north is particularly serious, and the percentage ratio of northeast, North China and the effective zinc content of the Northwest's soil subcritical value (2 mug zn/kilogram soil) is 71.1%.Therefore application of zinc fertilizer is to improve soil to supply the zinc ability, improve the plant zinc content, improve one of effective measure of the plain nutrition of human zinc.
The zinc fertilizer of using in the production practice at present mainly is a zinc sulfate, and this zinc fertilizer solvability is good, mainly exists with the zine ion state after being manured into soil, and soil acidity or alkalinity, calcium carbonate content etc. has a strong impact on its validity to crop.According to research, when soil pH value increased by 1 unit, the validity of zinc reduced by 100 times.Soil also is the important factor of restriction zinc fertilizer validity to the adsorption of zine ion; The zinc fertilizer that external source applies is almost completely lost activity by adsorption by soil usually in a short period of time, has adsorbing material and comprises soil clay particle, lime carbonate, red stone etc.People attempt to improve through innovation zinc fertilizer kind the validity and the utilising efficiency of zinc fertilizer all the time.
CN200810223530.7 discloses a kind of plant and has used particle zinc fertilizer.This particle zinc fertilizer is made up of following compositions: the zinc sulfate of 20-30 mass parts, the liquid-containing binder of the humic acids of the elemental sulfur of 25-35 mass parts, 20-30 mass parts, the wilkinite of 15-25 mass parts and 3-5 mass parts.Said particle zinc fertilizer is made up of fertile core and coating, and wherein, fertile core is made up of zinc sulfate, elemental sulfur, humic acids and liquid-containing binder, and coating is that elemental sulfur, wilkinite and liquid-containing binder are formed.The particle zinc fertilizer of this invention is a kind of new and effective particle zinc fertilizer of suitable northern China calcareous soil; In the fertilizer culture experiment; This particle zinc fertilizer is used common zinc sulfate can obviously reduce a soil pH value 0.4-0.5 unit, and improving in the soil effectively, zinc concentration reaches more than 60%.
CN 200910087592.4 provides a kind of long-acting zinc fertilizer and preparation method thereof, and it contains the effective constituent of following weight part: soluble zinc salt 5-20 part; Organic zinc and/or zinc oxide 1-160 part.This long-acting zinc fertilizer is prepared from through following method: with soluble zinc salt, organic zinc and/or zinc oxide; Sieve behind the pulverize separately; Abundant mixing by weight ratio then, again with sieve after attapulgite 0-50 weight part, dispersion agent 0-5 weight part, the abundant mixing of wetting agent 0-5 weight part.It is a kind of with quick-acting and long lasting particle zinc fertilizer and preparation method thereof that CN 201110195433.3 provides, and comprises following component: the inorganic zinc of 60-90 mass parts; The organic zinc of 10-40 mass parts; The weighting agent of 0-10 mass parts; The sticker of 0-10 mass parts.Above-mentioned zinc fertilizer combines through organic zinc and inorganic zinc on the one hand, utilizes the coating mode that inorganic zinc fertilizer is wrapped up on the other hand, has prolonged the validity period of zinc fertilizer, has improved utilising efficiency.But their common deficiencies that exists are that organic zinc costs an arm and a leg, and has increased fertilizer cost; Pure inorganic coated fertilizer putamina is prone to broken, loses the slow/controlled release effect of coating etc. easily.
Summary of the invention
To the deficiency of prior art, the present invention provides the controlled release zinc fertilizer of a kind of low cost, coating good toughness.
Summary of the invention
The present invention utilizes Zinc Sulphate Heptahydrate, weathered coal, urea, wilkinite to carry out composite, granulation, and it is fertile to form the nuclear core, again with fused sulphur to nuclear core fertilizer coating; At last with the modified epoxy material to bag sulphur zinc fertilizer coating again; Process the double-deck coating zinc fertilizer of three kinds of different peplos thickness, and it is composite that different membrane wrapping thickness zinc fertilizers are carried out secondary, makes the fertilizer releasing period of controlled release zinc fertilizer in soil of being produced long; Release rate is even, and applied once can satisfy 1 year needs of crop.The present invention has obtained good effect through field test.
Technical scheme of the present invention is following:
A kind of controlled release zinc fertilizer comprises that the nuclear core is fertile and is coated on the inside and outside double-deck coating on the fertile particle of nuclear core; Wherein, the fertile raw materials quality part of nuclear core consists of: 500～700 parts of Zinc Sulphate Heptahydrates, 100～200 parts of weathered coals, 120～240 parts in urea, 40～80 parts of wilkinites; The fertile grain diameter 2-3 of nuclear core millimeter;
The internal layer coating is the sulphur coating, accounts for the 10-15wt% of the fertile quality of nuclear core;
Outer coating is a modified epoxy resin integument; Said modified epoxy resin integument agent is that epoxy resin E-44 and polyurethane PU R are mixed and made into modified epoxy with 9: 1 mass ratioes; Add again and account for epoxy resin E-44 and the solidifying agent T-593 of polyurethane PU R total amount 10wt%, the thinner benzyl glycidyl ether of 15wt% and the starch of 1wt%, mix and get;
Outer coating agent consumption accounts for 2wt%, 3wt%, the 4wt% of the fertile quality of nuclear core respectively; Correspond to I, II, three kinds of double-deck coat fertilizers of III respectively; With this I, II, three kinds of double-deck coat fertilizers of III by mass ratio 1～2: mix at 1～2: 1～1.5, promptly gets the controlled release zinc fertilizer.
Preferred according to the present invention, the fertile raw materials quality part of nuclear core consists of: 590～610 parts of Zinc Sulphate Heptahydrates, 145～155 parts of weathered coals, 190～210 parts in urea, 45～55 parts of wilkinites.
Raw material Zinc Sulphate Heptahydrate, weathered coal, urea, wilkinite in the controlled release zinc fertilizer according to the invention are the commercially available prod.Preferably, weathered coal is crossed 100 mesh sieves, and urea is Powdered.
According to the present invention, the preparation method of said controlled release zinc fertilizer, step is:
By proportioning, get Zinc Sulphate Heptahydrate, weathered coal, urea, wilkinite, mix, by prior art, the particulate state nuclear core of processing particle diameter 2-3 millimeter is fertile, with the fertile bag of this particulate state nuclear core one deck sulphur film, wraps one deck modified epoxy resin film more earlier, promptly gets.
Preferred according to the present invention, the preparation method of said controlled release zinc fertilizer, step is following:
(1) by proportioning, get Zinc Sulphate Heptahydrate, weathered coal, urea, wilkinite, mix, process the particulate state fertilizer of particle diameter 2-3 millimeter by prior art, must examine core fertilizer.
(2) extracting epoxy resin E-44 and polyurethane PU R are mixed and made into modified epoxy with 9: 1 mass ratioes; Adding accounts for epoxy resin E-44 and the solidifying agent T-593 of polyurethane PU R total amount 10wt%, the thinner benzyl glycidyl ether of 15wt% and the starch of 1wt% again, mixes.Get the modified epoxy resin integument agent.
(3) the nuclear core fertilizer with step (1) preparation is preheated to 70 ° of C～80 ° C, moves in the rotary drum, molten sulfur is sprayed on the fertiliser granulates that constantly rotates in the rotary drum, forms the sulphur film, and the sulphur film quality accounts for the 10-15wt% of core fertilizer quality, must wrap the sulphur zinc fertilizer.
(4) get the modified epoxy resin integument agent of step (2) preparation, join while hot on the bag sulphur zinc fertilizer of continuous rotation of step (3) preparation, 3-5 minute after fixing film forming, it is 1wt% that the modified epoxy resin integument agent accounts for the fertile mass ratio of nuclear core; Repeat said process again 1 time, obtain the double-deck coat fertilizer I that the outer coating consumption of modified epoxy accounts for the fertile quality 2wt% of nuclear core;
(5) get the bag sulphur zinc fertilizer of step (3) in addition; Repeat above-mentioned steps (4); Obtaining on the double-deck coat fertilizer that outer coating consumption accounts for the fertile quality 2wt% of nuclear core; Continue again the modified epoxy resin integument agent that coating accounts for the fertile quality 1wt% of nuclear core for 1 time, obtain the double-deck coat fertilizer II that outer coating consumption accounts for the fertile quality 3wt% of nuclear core;
(6) get the bag sulphur zinc fertilizer of step (3) for the third time again; Repeat above-mentioned steps (5); Obtaining on the double-deck coat fertilizer that outer coating consumption accounts for the fertile quality 3wt% of nuclear core; Continue again the modified epoxy resin integument agent that coating accounts for the fertile quality 1wt% of nuclear core for 1 time, obtain the double-deck coat fertilizer III that outer coating consumption accounts for the fertile quality 4wt% of nuclear core.
(7) press mass ratio 1～2: 1～2: 1～1.5, the double-deck coat fertilizer I that step (4) is made, the double-deck coat fertilizer II that step (5) makes, the double-deck coat fertilizer III that step (6) makes mix, controlled release zinc fertilizer of the present invention.
Starch described in the above-mentioned steps (2) be preferably W-Gum, one of melon starch, tapioca(flour) or the combination.
The application of controlled release zinc fertilizer of the present invention, adopt as one of following method:
ⅰ. before seeding crops is ploughed, controlled release zinc fertilizer of the present invention is evenly spread fertilizer over the fields in soil surface, turn over then and bury.Perhaps,
ⅱ. combine seeding crops, controlled release zinc fertilizer of the present invention is used simultaneously, fertilizer placement is a seed below or a side, apart from ground 8-10 centimetre.Perhaps,
ⅲ. with other applications of mixed fertilizers such as controlled release zinc fertilizer of the present invention and composite fertilizers.
Every mu of consumption 2-4 of controlled release zinc fertilizer of the present invention kilogram was to the validity period of crop 1 year.
Excellent results of the present invention:
1. the validity of zinc is good
Mainly exist with the zine ion state after inorganic zinc fertilizer is manured into soil, soil acidity or alkalinity, calcium carbonate content etc. has a significant effect to its validity, the most of soil meta-alkalescence of northern China particularly, and zinc fertilizer is relatively poor to the validity of crop, and utilising efficiency is low.Controlled release zinc fertilizer of the present invention has reduced with the direct of soil through coating on the one hand and has contacted, and reduces the fixed action to zinc; The oxidation results of theca interna sulphur in soil makes local soil reduce the pH value on the other hand, improves the validity of zinc.
2. nutrient discharges evenly
Controlled release zinc fertilizer of the present invention adopts dual coating to cooperatively interact, and utilizes the component of different membrane wrapping thicknesses composite, and zine ion is discharged evenly, can satisfy crop and absorb requirement.
3. the fertilizer efficiency time is long
Controlled release zinc fertilizer of the present invention is long working lipe in soil, can satisfy in 1 year two seasons or three season the crop needs.
4. use conveniently
Smooth, the good toughness of controlled release zinc fertilizer outer membrane of the present invention, particle size and present composite fertilizer are approaching, can with use after composite fertilizer is mixed, and fertilising is evenly.
Embodiment
Below in conjunction with embodiment the present invention is further specified, but be not limited thereto.Raw material consumption umber among the embodiment is mass parts.
Weathered coal, surface mines coal works, Ningwu County, Shanxi Province produces, and organic content 62.3wt% crosses 100 mesh sieves.
Starch, W-Gum, the Shandong profit is given birth to starch ltd and is produced.
Wilkinite, Shandong development wilkinite factory produces.
Epoxy resin E-44, urethane (PUR) are available from Jiangsu Miki Chemical Co., Ltd.
Embodiment 1:
A kind of controlled release zinc fertilizer, the fertile raw material of nuclear core are formed: 600 kilograms of Zinc Sulphate Heptahydrates, 150 kilograms of weathered coals, 200 kilograms in urea, 50 kilograms of wilkinites.Internal layer sulphur coating accounts for the 12wt% of the fertile quality of nuclear core; Outer membrane wrapping modified epoxy resin integument consumption accounts for 2wt%, 3wt%, the 4wt% of the fertile quality of nuclear core respectively, and these three kinds of double-deck coat fertilizers are pressed mass ratio mixing in 1: 1: 1 and got.
The preparation method, step is following:
(1) by proportioning, get 600 kilograms of Zinc Sulphate Heptahydrates, 150 kilograms of weathered coals, 200 kilograms in urea, 50 kilograms of wilkinites mix, and the cylinder granulation is prepared into the particulate state fertilizer of particle diameter 2-3 millimeter, must examine core fertilizer.
(2) extracting epoxy resin E-449 kilogram, urethane (PUR) are 1 kilogram, mix, and add 1 kilogram of solidifying agent T-593,1.5 kilograms of thinner benzyl glycidyl ethers and 0.1 kilogram of W-Gum, mix.Get the modified epoxy resin integument agent.
(3) get fertile 300 kilograms of the nuclear core of step (1) preparation, in preheating container, be preheated to 70 ° of C, this fertilizer is transferred in the rotary drum; Spray to molten sulfur on the fertiliser granulates that constantly rotates in the rotary drum through nozzle; Form the sulphur film, the sulphur film quality accounts for the fertile quality 12wt% of nuclear core, must wrap the sulphur zinc fertilizer; Gained bag sulphur zinc fertilizer is divided into three parts, and is subsequent use.
(4) get the bag sulphur zinc fertilizer portion that step (3) prepares; 1 kilogram of the modified epoxy resin integument agent of step (2) preparation is joined while hot on the bag sulphur zinc fertilizer of continuous rotation; 3-5 minute after fixing film forming; Add 1 kilogram of modified epoxy resin integument agent again, 3-5 minute after fixing film forming obtains the double-deck coat fertilizer I that outer coating consumption accounts for the 2wt% of the fertile quality of nuclear core;
(5) get the bag sulphur zinc fertilizer that a step (3) prepares in addition; Repeat above-mentioned steps (4); Obtaining on the double-deck coat fertilizer of 2wt% that outer coating consumption accounts for the fertile quality of nuclear core; Continue to add 1 kilogram of modified epoxy resin integument agent again, 3-5 minute after fixing film forming obtains the double-deck coat fertilizer II that outer coating consumption accounts for the 3wt% of the fertile quality of nuclear core;
(6) get the bag sulphur zinc fertilizer that the 3rd part of step (3) prepares again; Repeat above-mentioned steps (5); Account at the outer coating consumption that obtains on the double-deck coat fertilizer of the 3wt% that examines the fertile quality of core; Continue to add 1 kilogram of modified epoxy resin integument agent again, 3-5 minute after fixing film forming obtains the double-deck coat fertilizer III that outer coating consumption accounts for the 4wt% of the fertile quality of nuclear core;
(7) pressed mass ratio 1: 1: 1, double-deck coat fertilizer I, double-deck coat fertilizer II, double-deck coat fertilizer III that step (4), (5), (6) are made mix, and get the controlled release zinc fertilizer.
Embodiment 2:
A kind of controlled release zinc fertilizer, the fertile raw material of nuclear core are formed: 500 kilograms of Zinc Sulphate Heptahydrates, 200 kilograms of weathered coals, 240 kilograms in urea, 60 kilograms of wilkinites.
The preparation method, of embodiment 1, different is:
(1) get 500 kilograms of Zinc Sulphate Heptahydrates, 200 kilograms of weathered coals, 240 kilograms in urea, 60 kilograms of wilkinites mix, and the cylinder granulation is prepared into the particulate state fertilizer of particle diameter 2-3 millimeter, must examine core fertilizer.
(2) the modified epoxy resin integument agent is with embodiment 1.
(3) get 180 kilograms of the nuclear core zinc fertilizers of step (1) preparation; In preheating container, be preheated to 80 ° of C; This fertilizer is transferred in the rotary drum, molten sulfur is sprayed to through nozzle on the fertiliser granulates that constantly rotates in the rotary drum, form the sulphur film; The sulphur film quality accounts for the fertile quality 15wt% of nuclear core, must wrap the sulphur zinc fertilizer.
(4)-(6) outer membrane wrapping modified epoxy resin integument consumption accounts for the preparation method of three kinds of double-deck coat fertilizer I, II, III of 2wt%, 3wt%, the 4wt% of the fertile quality of nuclear core respectively with embodiment 1.
(7) press mass ratio 1: 2: 1.5, get 2wt%, 3wt%, three kinds of double-deck coat fertilizer I of 4wt%, II, III that outer membrane wrapping modified epoxy resin integument consumption accounts for the fertile quality of nuclear core respectively, mix, get the controlled release zinc fertilizer.
Embodiment 3:
A kind of controlled release zinc fertilizer raw material is formed: 700 kilograms of Zinc Sulphate Heptahydrates, 100 kilograms of weathered coals, 130 kilograms in urea, 70 kilograms of wilkinites.
The preparation method is:
(1) by proportioning, get 700 kilograms of Zinc Sulphate Heptahydrates, 100 kilograms of weathered coals, 130 kilograms in urea, 70 kilograms of wilkinites mix, the cylinder granulation is prepared into the particulate state fertilizer of particle diameter 2-3 millimeter, the core zinc fertilizer.
(2) the modified epoxy resin integument agent is with embodiment 1.
(3) get 240 kilograms of the core zinc fertilizers of step (1) preparation; In preheating container, be preheated to 75 ° of C; This fertilizer is transferred in the rotary drum, molten sulfur is sprayed to through nozzle on the fertiliser granulates that constantly rotates in the rotary drum, form the sulphur film; The sulphur film quality accounts for the fertile quality 10wt% of nuclear core, must wrap the sulphur zinc fertilizer.
(4)-(6) outer membrane wrapping modified epoxy resin integument consumption accounts for the preparation of three kinds of double-deck coat fertilizer I, II, III of 2wt%, 3wt%, the 4wt% of the fertile quality of nuclear core respectively with embodiment 1.
(7) press mass ratio 2: 1.5: 1, get 2wt%, 3wt%, three kinds of double-deck coat fertilizer I of 4wt%, II, III that outer membrane wrapping modified epoxy resin integument consumption accounts for the fertile quality of nuclear core respectively, mix, get controlled release zinc fertilizer of the present invention.
Comparative Examples: Zinc Sulphate Heptahydrate, commercially available prod.
The effect of above embodiment 1～3 and Comparative Examples is following:
Test place: Shandong Province's Linyi City.
Test period: year June in June, 2011 to 2012.
Confession studies thing: corn, and kind, Zheng Dan 958; Wheat, kind, Jimai 22.
Cultivation mode: on same plot, corn, wheat crop rotation.
If embodiment 1-3 and Comparative Examples be totally 4 processing, each handles 50 square metres of sub-district areas, triplicate.The amount that the controlled release zinc fertilizer consumption of embodiment is amounted to into Zinc Sulphate Heptahydrate, identical with the Comparative Examples consumption, 3 kilograms every mu, other fertilizer use and field management identical by routine techniques.Zinc fertilizer is disposable all to be used when corn seeding, does not re-use zinc fertilizer when sowing wheat again behind the harvesting corn, the aftereffect of application of zinc fertilizer fertilizer before the wheat utilization.Fertilizing method is, utilizes manure spreader to execute in the capable vertical lower of corn seeding, and fertilizer is apart from 10 centimetres on the face of land.Other management is identical.Effect is seen table 1.
Table 1. is compared the effect of embodiment 1-3 with Comparative Examples
Claims (4)
1. a controlled release zinc fertilizer comprises that the nuclear core is fertile and is coated on the inside and outside double-deck coating on the fertile particle of nuclear core, it is characterized in that; The fertile raw materials quality part of said nuclear core consists of: 500～700 parts of Zinc Sulphate Heptahydrates; 100～200 parts of weathered coals, 120～240 parts in urea, 40～80 parts of wilkinites; The fertile grain diameter of nuclear core is the 2-3 millimeter;
The internal layer coating is the sulphur coating, accounts for the 10-15wt% of the fertile quality of nuclear core;
Outer coating is a modified epoxy resin integument; Said modified epoxy resin integument agent is that epoxy resin E-44 and polyurethane PU R are mixed and made into modified epoxy with 9: 1 mass ratioes; Add again and account for epoxy resin E-44 and the solidifying agent T-593 of polyurethane PU R total amount 10wt%, the thinner benzyl glycidyl ether of 15wt% and the starch of 1wt%, mix and get;
Outer coating agent consumption accounts for 2wt%, 3wt%, the 4wt% of the fertile quality of nuclear core respectively; Correspond to I, II, three kinds of double-deck coat fertilizers of III respectively; With this I, II, three kinds of double-deck coat fertilizers of III by mass ratio 1～2: mix at 1～2: 1～1.5, promptly gets the controlled release zinc fertilizer.
2. controlled release zinc fertilizer as claimed in claim 1 is characterized in that, the fertile raw materials quality part of nuclear core consists of: 590～610 parts of Zinc Sulphate Heptahydrates, 145～155 parts of weathered coals, 190～210 parts in urea, 45～55 parts of wilkinites.
3. the preparation method of claim 1 or 2 described controlled release zinc fertilizers, step is following:
(1) by proportioning, get Zinc Sulphate Heptahydrate, weathered coal, urea, wilkinite, mix, process the particulate state fertilizer of particle diameter 2-3 millimeter by prior art, must examine core fertilizer;
(2) extracting epoxy resin E-44 and polyurethane PU R are mixed and made into modified epoxy with 9: 1 mass ratioes; Add again and account for epoxy resin E-44 and the solidifying agent T-593 of polyurethane PU R total amount 10wt%, the thinner benzyl glycidyl ether of 15wt% and the starch of 1wt%; Mix, get the modified epoxy resin integument agent;
(3) the nuclear core fertilizer with step (1) preparation is preheated to 70 ° of C～80 ° C, moves in the rotary drum, molten sulfur is sprayed on the fertiliser granulates that constantly rotates in the rotary drum, forms the sulphur film, and the sulphur film quality accounts for the 10-15wt% of core fertilizer quality, must wrap the sulphur zinc fertilizer;
(4) get the modified epoxy resin integument agent of step (2) preparation, join while hot on the bag sulphur zinc fertilizer of continuous rotation of step (3) preparation, 3-5 minute after fixing film forming, it is 1wt% that the modified epoxy resin integument agent accounts for the fertile mass ratio of nuclear core; Repeat said process again 1 time, obtain the double-deck coat fertilizer I that the outer coating consumption of modified epoxy accounts for the fertile quality 2wt% of nuclear core;
(5) get the bag sulphur zinc fertilizer of step (3) in addition; Repeat above-mentioned steps (4); Obtaining on the double-deck coat fertilizer that outer coating consumption accounts for the fertile quality 2wt% of nuclear core; Continue again the modified epoxy resin integument agent that coating accounts for the fertile quality 1wt% of nuclear core for 1 time, obtain the double-deck coat fertilizer II that outer coating consumption accounts for the fertile quality 3wt% of nuclear core;
(6) get the bag sulphur zinc fertilizer of step (3) for the third time again; Repeat above-mentioned steps (5); Obtaining on the double-deck coat fertilizer that outer coating consumption accounts for the fertile quality 3wt% of nuclear core; Continue again the modified epoxy resin integument agent that coating accounts for the fertile quality 1wt% of nuclear core for 1 time, obtain the double-deck coat fertilizer III that outer coating consumption accounts for the fertile quality 4wt% of nuclear core;
(7) press mass ratio 1～2: 1～2: 1～1.5, the double-deck coat fertilizer I that step (4) is made, the double-deck coat fertilizer II that step (5) makes, the double-deck coat fertilizer III that step (6) makes mix, controlled release zinc fertilizer of the present invention.
4. the preparation method of controlled release zinc fertilizer as claimed in claim 3 is characterized in that, the starch described in the step (2) be W-Gum, one of melon starch, tapioca(flour) or the combination.
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| CN105461429A (en) * | 2015-12-02 | 2016-04-06 | 深圳市芭田生态工程股份有限公司 | Coated controlled-release fertilizer and preparation method thereof |
| CN108503432A (en) * | 2018-05-22 | 2018-09-07 | 苏州硒谷科技有限公司 | A kind of composite coated slow-released zinc fertilizer and preparation method thereof |
| CN113582782A (en) * | 2021-08-13 | 2021-11-02 | 贵州省烟草科学研究院 | Segmented-absorption fully-degradable coated rod fertilizer for cigarettes and preparation method thereof |
| CN114956902A (en) * | 2022-04-07 | 2022-08-30 | 江西师范大学 | Controlled-release zinc fertilizer for enriching zinc and reducing cadmium in brown rice and preparation method thereof |
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