CN111747793A - Special controlled-release formula fertilizer for fruit trees - Google Patents
Special controlled-release formula fertilizer for fruit trees Download PDFInfo
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- CN111747793A CN111747793A CN202010533391.9A CN202010533391A CN111747793A CN 111747793 A CN111747793 A CN 111747793A CN 202010533391 A CN202010533391 A CN 202010533391A CN 111747793 A CN111747793 A CN 111747793A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/04—Double-superphosphate; Triple-superphosphate; Other fertilisers based essentially on monocalcium phosphate
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
Abstract
The invention discloses a special controlled release formula fertilizer for fruit trees, which is prepared by mixing 10-40 parts by weight of coated urea, 10-40 parts by weight of P, granulated phosphate fertilizer, granulated potash fertilizer and filler2O56-10 parts of CaO, 8-30 parts of CaO, 5-20 parts of MgO and K210-15 parts of O, 0.2-0.6 part of zinc sulfate, 0.2-0.6 part of borax and 5-20 parts of filling material. The fertilizer provided by the invention only needs to be applied once before fruit tree germination, and does not need to be applied again, compared with 5 times of traditional quick-acting fertilizer application, the special controlled-release formula fertilizer for forest fruits is applied as a base fertilizer for 1 time before jujube tree germination, and under the condition that the fertilizer application amount is reduced by 20%, the yield of jujube trees is increased by 13.7%, the single fruit weight of jujube fruits is increased by 7.1%, the first-stage fruit rate is increased by 15.6%, the inferior-stage fruit rate is reduced by 19.8%, the fruit cracking rate is reduced by 10.2%, and the fertilizer application frequency is reduced from 5 times of the traditional fertilizer to 1 time.
Description
Technical Field
The invention relates to the technical field of fertilizers, in particular to a special controlled-release formula fertilizer for fruit trees.
Background
Jujube is native to China and has a growth history of over 5000 years so far. Jujube (Ziziphus jujuba Mill.) is a jujube plant belonging to Rhamnaceae, has the characteristics and advantages of rich nutrition, strong adaptability, remarkable economic and ecological benefits and the like, becomes a new hot point in the development of fruit trees, and additionally, the unique natural climate conditions in the south area of Xinjiang, Xinjiang becomes one of the main areas for producing high-quality jujube, Xinjiang-Hui-jujube has low acid content, proper taste, higher sugar content and delicious taste, and people pay more and more attention to the value of Hui-jujube.
Nitrogen is a necessary core element for the growth and development of fruit trees, and because the nitrogen is a key element for forming a plant biological tissue, the nitrogen fertilizer can not only ensure that the plant grows and develops well, but also has a certain effect on the quality and the yield of fruits, under the condition that the jujube trees are treated by nitrogen fertilizers with different levels, the new branch length, the new branch thickness and the tree height of the jujube trees are increased to a certain extent, phosphorus is an important element for forming a plurality of organic compounds in the plant bodies, the application of a phosphate fertilizer is directly embodied in the aspects of increasing the leaf area, improving the photosynthesis and the like, potassium is an important reason for improving the quality of the fruits, the fruits have bright and bright appearance, and the tastes sour, sweet and delicious without potassium. In Xinjiang agricultural production, nitrogen deficiency, phosphorus deficiency and potassium enrichment are always considered, in the aspect of fertilizer application, sufficient fertilizer must be contained in each growth period in order to improve the yield of the ziziphus jujubes, but the conventional fertilizer for the ziziphus jujubes cannot be slowly released, so that the fertility of the ziziphus jujubes in the growth period is unevenly released, the growth requirement of the ziziphus jujubes cannot be met, and the conventional fertilizer for the ziziphus jujubes is largely lost after being applied, so that the fertilizer is wasted on one hand, and the fertilizer also causes environmental pollution on the other hand. According to the soil characteristics of the jujube tree planting field in Xinjiang, a proper controlled and slow release fertilizer source, a preparation method, a fertilizer and the like are selected, and the key points of improving the quality and the yield of the Xinjiang lime jujubes, reducing the production cost and improving the utilization rate of the fertilizer are realized.
Disclosure of Invention
Aiming at the technical current situations of increasing the cost of the ash jujube, polluting the chemical fertilizer environment and lowering the utilization rate of the fertilizer caused by a large amount of fertilizer applied to the ash jujube in south Xinjiang, no literature report and disclosure is found at present for the controlled release fertilizer applied to the ash jujube in south Xinjiang. The invention aims to provide a special controlled-release formula fertilizer for fruit trees, which is prepared by mixing coating liquid, coated urea, granular phosphate fertilizer, granular potash fertilizer and filler in a matching way, wherein the fertilizer comprises 10-40 parts of coated urea and P by weight2O56-10 parts of CaO, 8-30 parts of CaO, 5-20 parts of MgO and K210-15 parts of O, 0.2-0.6 part of zinc sulfate, 0.2-0.6 part of borax and the balance of filling materials. The fertilizer provided by the invention only needs to be applied once before fruit tree germination, and does not need to be applied again, compared with 5 times of traditional quick-acting fertilizer application, the special controlled-release formula fertilizer for forest fruits is applied as a base fertilizer for 1 time before jujube tree germination, and under the condition that the fertilizer application amount is reduced by 20%, the yield of jujube trees is increased by 13.7%, the single fruit weight of jujube fruits is increased by 7.1%, the first-stage fruit rate is increased by 15.6%, the inferior-stage fruit rate is reduced by 19.8%, the fruit cracking rate is reduced by 10.2%, and the fertilizer application frequency is reduced from 5 times of the traditional fertilizer to 1 time.
In order to achieve the technical purpose, the invention is realized by the following technical scheme:
the controlled release formula fertilizer special for the fruit trees comprises coating liquid, coated urea, granular phosphate fertilizer, granular potash fertilizer and filler, and is prepared by uniformly mixing and granulating after being crushed according to a proportion.
The controlled release formula fertilizer special for the fruit trees comprises, by weight, 10-40 parts of coated urea and P2O56-10 parts of CaO, 8-30 parts of CaO, 5-20 parts of MgO and K210-20 parts of O, 0.2-0.6 part of zinc sulfate, 0.2-0.6 part of borax and 5-20 parts of filling material.
Further, the controlled release formula fertilizer special for fruit trees comprises 30 parts by weight of coated urea and P2O58 parts of CaO 25 parts, MgO 12 parts and K2O18 parts, zinc sulfate 0.4 parts, borax 0.4 parts, fillingAnd 15 parts of lignin oxide.
The filler is one or more of calcium sulfate, magnesium sulfate, phenolic resin and lignin oxide
A preparation method of a special controlled-release formula fertilizer for fruit trees comprises the following specific steps:
(1) mixing the following components in a mass ratio of 1: 1.1: 0.5 of chitosan, glycerol and beeswax are dissolved in an organic solvent to prepare a coating liquid.
(2) The coated urea comprises, by mass percent, N which is not less than 43%, and the release time is 90 days at the temperature of 25 ℃ and 120 days at the temperature of 15 ℃; the granular phosphate fertilizer is triple superphosphate with granularity of 1-4.75mm not less than 90%, P2O540-50%; potassium sulfate as granular potash fertilizer with granularity of 1-4.75mm not less than 90% and K240-50% of O, 0.6-1.8% of zinc sulfate and 0.6-1.8% of borax.
(3) And (2) putting 10 parts of the coating liquid obtained in the step (1), 30 parts of coated urea, 15 parts of granular phosphate fertilizer, 18 parts of granular potash fertilizer and 15 parts of filler into a stirrer, stirring for 10-20min, and fully and uniformly mixing to obtain the controlled-release formula fertilizer special for the fruit trees.
After the technical scheme is adopted, the invention has the following beneficial effects:
the controlled release formula fertilizer special for the fruit trees is applied as a base fertilizer for 1 time before the jujube trees sprout, under the condition that the fertilizing amount is reduced by 20 percent, the yield of the jujube trees is increased by 13.7 percent, the weight of single fruits of the jujube trees is increased by 7.1 percent, the first-grade fruit rate is increased by 15.6 percent, the inferior-grade fruit rate is reduced by 19.8 percent, the fruit cracking rate is reduced by 10.2 percent, and the fertilizing times are reduced to 1 time from 5 times of the traditional fertilizer.
Description of the drawings:
FIG. 1 is a curved surface diagram showing the influence of the content of coated urea and the content of granulated phosphate fertilizer on SPAD of jujube trees.
FIG. 2 is a curved surface diagram showing the influence of the coated urea content and the granular potash fertilizer content on the SPAD of the jujube trees.
FIG. 3 is a curved surface diagram showing the influence of the content of granulated phosphate fertilizer and the content of granulated potassium fertilizer on SPAD of jujube trees.
FIG. 4 is a curved surface diagram showing the influence of the coated urea content and the granulated phosphate fertilizer content on the fruit setting number of jujube trees.
FIG. 5 is a curved surface diagram showing the influence of the coated urea content and the granular potash fertilizer content on the fruit setting number of jujube trees.
FIG. 6 is a curved surface diagram showing the influence of the content of granulated phosphate fertilizer and the content of granulated potassium fertilizer on the fruit setting number of jujube trees.
FIG. 7 is a curved surface diagram showing the influence of the content of coated urea and the content of granulated phosphate fertilizer on the quality of jujube tree fruits.
FIG. 8 is a curved surface diagram showing the influence of the coated urea content and the granular potash fertilizer content on the quality of jujube tree fruits.
FIG. 9 is a curved surface diagram showing the influence of the content of granulated phosphate fertilizer and the content of granulated potash fertilizer on the quality of jujube tree fruits.
Detailed Description
The present invention will be described below with reference to examples, but the present invention is not limited to the following examples.
The raw materials of coated urea, potassium oxide, zinc oxide and the like adopted by the invention can be purchased through public channels, and the equipment and instruments adopted in the process are common equipment in the field.
All materials, practices and instrumentation assays selected for use in the present invention are well known in the art and are not intended to limit the embodiments of the invention, and other reagents and equipment well known in the art may be suitable for use in the practice of the following embodiments of the invention.
The invention has the following measurement indexes: and (3) measuring the SPAD value of leaves, the yield of the jujube trees, the quality of the jujube trees and other performance indexes, repeating each test for 5 times, randomly extracting 1 test field of healthy jujube trees, and carrying out sampling statistics.
Example 1: special controlled-release formula fertilizer for fruit trees
The controlled-release formula fertilizer special for fruit trees comprises 30kg of coated urea and P by mass2O58kg，CaO25kg，MgO 12kg，K218kg of O, 0.4kg of zinc sulfate, 0.4kg of borax and 15kg of filler lignin oxide.
Example 2: special controlled-release formula fertilizer for fruit trees
The fruit tree is specialThe controlled release formula fertilizer comprises 40kg of coated urea and P by mass2O56kg，CaO30kg，MgO 5kg，K210kg of O, 0.4kg of zinc sulfate, 0.6kg of borax and 20kg of filler lignin oxide.
Example 3: special controlled-release formula fertilizer for fruit trees
The controlled-release formula fertilizer special for fruit trees comprises 10kg of coated urea and P by mass2O58kg，CaO8kg，MgO 20kg，K215kg of O, 0.2kg of zinc sulfate, 0.4kg of borax and 15kg of filler lignin oxide.
Example 4: special controlled-release formula fertilizer for fruit trees
The controlled-release formula fertilizer special for fruit trees comprises 20kg of coated urea and P by mass2O510kg，CaO30kg，MgO 10kg，K220kg of O, 0.6kg of zinc sulfate, 0.2kg of borax and 5kg of filler lignin oxide.
Example 5: special controlled-release formula fertilizer for fruit trees
The controlled-release formula fertilizer special for fruit trees comprises 30kg of coated urea and P by mass2O57kg，CaO15kg，MgO 18kg，K212kg of O, 0.5kg of zinc sulfate, 0.5kg of borax and 10kg of filler lignin oxide.
Example 6: preparation method of controlled-release formula fertilizer special for fruit trees
Dissolving 10kg of chitosan, 11kg of glycerol and 5kg of beeswax in an organic solvent to prepare a coating liquid; the N content of the coated urea is more than or equal to 43 percent by mass, the release time is 90 days at the temperature of 25 ℃, and the release time is 120 days at the temperature of 15 ℃; the granular phosphate fertilizer is triple superphosphate with granularity of 1-4.75mm not less than 90%, P2O540-50%; potassium sulfate as granular potash fertilizer with granularity of 1-4.75mm not less than 90% and K240-50% of O, 0.6-1.8% of zinc sulfate and 0.6-1.8% of borax; 10kg of the obtained coating liquid, 30kg of coated urea, 15kg of granular phosphate fertilizer and 18kg of granular potash fertilizer are put into a stirrer together and stirred for 15min, and the controlled release formula fertilizer special for the fruit trees is obtained after full and uniform mixing.
Example 7: formula optimization of controlled-release formula fertilizer special for fruit trees
A Box-Behnken test design is adopted, the formula in example 1 and the preparation method in example 6 are respectively adopted to prepare the controlled release formula fertilizer special for fruit trees, the influence of the coated urea content (A), the granular phosphate fertilizer content (B) and the granular potash fertilizer content (C) on the SPAD of leaves, the fruit setting number and the fruit quality of the Xinjiang lime jujube trees in the flowering period after the fertilizer is applied is researched, a mathematical model of the formula of the controlled release formula fertilizer special for the fruit trees and the indexes of the quality of the fertilized jujube trees and the fruits is established, the response surface test factors and the level are shown in a table 1, and the Box-Bohnken test design and the results are shown in a table 2 and attached figures 1-9.
Table 1: response surface test factor level table
| Composition of | Unit of | Minimum value | Maximum value |
| Coated urea content | Portions are | 20 | 40 |
| Content of granulated phosphate | Portions are | 10 | 20 |
| Granular potash fertilizer | Portions are | 16 | 20 |
Table 2: design result of Box-bohnken experiment
According to response surface analysis, the optimal formula of the controlled release formula fertilizer special for the fruit trees is as follows: according to the weight portion, when the coated urea is 30 portions, the granulated phosphate fertilizer content is 15 portions, and the granulated potash fertilizer content is 18 portions, the obtained product has the best quality of jujube trees and fruits after being applied. In a verification test, the fertilizer formula is selected to be 30kg of coated urea, 15kg of granulated phosphate fertilizer and 18kg of granulated potash fertilizer, the SPAD of the leaves of the jujube trees is 41.2, the fruit setting number of the jujube trees is 2552 and the fruit evaluation score is 93 after the special controlled-release mixed fertilizer used in the sprouting period of the fruit trees is applied, and the practical value and the predicted value of the application effect of the special controlled-release formula fertilizer for the fruit trees prepared under the determined formula and process conditions are basically consistent, so that the process model has a better effect.
Example 8: compared with the effect of applying the conventional compound fertilizer to the fructus ziziphi spinosae, the special controlled-release formula fertilizer for the fruit trees has the advantage that the effect of applying the fructus ziziphi spinosae on the conventional compound fertilizer is improved
In this example, the application effects of the controlled release formulated fertilizer, the compound fertilizer and the controlled release fertilizer + the compound fertilizer are compared on the basis of example 1.
(1) Design of experiments
4 treatments are set in the test, C1 is compound fertilizer treatment, 1 time of base fertilizer and 4 times of additional fertilizer; c2, the controlled release fertilizer base fertilizer is applied for 1 time, and the fertilizing amount is reduced by 20 percent compared with that of C1; c3, controlled release fertilizer base fertilizer is applied for 1 time and compound fertilizer is applied for 1 time, and the fertilizing amount is reduced by 20 percent compared with that of C1; c4, controlled release fertilizer base fertilizer is applied for 1 time and compound fertilizer is applied for 2 times, and the fertilizing amount is reduced by 20 percent compared with that of C1.
Table 3: fertilization scheme design
(2) Management of field
Repeat for 4 times in single plant cell, establish guard row andprotective plant, test area 1024m2. Applying base fertilizer in late 3 months, digging a ditch about 40cm deep below water dripping lines on two sides of a crown, mixing the fertilizer with the designed amount and all farmyard manure, applying the mixture into the ditch, and covering soil. The top dressing method comprises the following steps: digging a ditch with the depth of about 15cm under the water dripping lines on the two sides of the crown, and applying a designed amount of compound fertilizer into the ditch to cover soil. Trimming and plant protection are carried out uniformly according to field management measures.
(2) Influence of different fertilization treatments on SPAD value of jujube tree leaves
The SPAD value of the leaves can reflect the nutrition status of the jujube trees and is directly related to the amount and final yield of photosynthetic products. The data of the specific test are shown in the attached table 4. As can be seen from the data in the attached Table 4, the SPAD values of the C2, C3 and C4 treated leaves at the flowering stage were significantly lower than that of the C1 treated leaves. The SPAD value of the leaf suitable for the flowering phase of the high-yield orchard is 40-43, while the SPAD value of the leaf of the C1 treatment in the flowering phase is 43.4 which is higher than the upper limit of the suitable range and is in a nitrogen luxury absorption stage, which indicates that the C1 treatment has excessive nitrogen supply in the flowering phase; the SPAD values of C2, C3 and C4 treated leaves are all in a proper range. The C2, C3 and C4 treatments are controlled-release fertilizer treatments, nitrogen is slowly released, and the controlled-release fertilizer has a buffering effect on the growth of the early branches and leaves of the jujube trees, and the C1 treatments are quick-acting compound fertilizer treatments and have an ultra-growth promoting effect on the growth of the early branches and leaves of the jujube trees. The test result shows that the controlled release fertilizer has the obvious effect of balancing the growth of branches and leaves of the jujube tree, thereby preventing the branches and leaves from excessively growing and being beneficial to the later flowering and fruit setting of the jujube tree and the formation of yield; in addition, the data shown in attached table 4 show that the SPAD value of the leaves treated by C2, C3 and C4 rises to a higher level by the fruit expanding period, which indicates that the nutrient release of the controlled release fertilizer is consistent with the organ construction of the jujube trees, because the nutrition of the jujube trees is mainly supplied for fruit growth, and the nutrient requirement is also larger.
Table 4: SPAD values of different treatments
(3) Influence of different fertilization treatments on jujube tree yield
The final effect of the fertilizer application is reflected by the yield and quality of the jujube trees, and the yield and quality of the jujube trees in this example are specifically shown in the attached table 5.
Table 5: effect of different fertilization treatments on jujube Tree yield (kg/666.7 m)2)
| Treatment of | Repetition of 1 | Repetition 2 | Repetition of 3 | Repetition of 4 | Average |
| C1 | 505.7 | 499.4 | 500.7 | 506.9 | 503.2c |
| C2 | 573.9 | 568.9 | 569.9 | 574.9 | 571.9a |
| C3 | 551.2 | 545.9 | 547.1 | 552.3 | 549.1ab |
| C4 | 546.1 | 540.3 | 541.4 | 547.3 | 543.8b |
As can be seen from the data in the attached table 5, the yield of the jujube trees treated by C2, C3 and C4 is obviously higher than that of the jujube trees treated by C1, the yield is improved by 8.1% -13.7%, wherein the yield of the jujube trees treated by C2 is the highest and is increased by 13.7% compared with that of the jujube trees treated by C1. C2 treatment is the treatment that the fertilizing amount is reduced by 20 percent compared with the C1 treatment and the controlled release fertilizer is used as the base fertilizer for all 1 time; the C1 treatment is the treatment of traditional quick-acting fertilizer, the base fertilizer is applied for 1 time, the additional fertilizer is applied for 4 times, and the C1 treatment is the standard method of the current jujube tree fertilization and the common method in production. Compared with the traditional quick-acting fertilizer, the controlled-release fertilizer is applied as the base fertilizer for 1 time before the jujube tree sprouts, so that the yield of the jujube tree is not reduced and the yield is increased to a greater extent under the condition that the fertilizing amount is reduced by 20 percent.
(4) Influence of different fertilization treatments on jujube tree yield
The weight of a single jujube fruit, the fruit cracking rate and the fruit grading according to the fruit size are important indexes for measuring the commodity quality of the jujube fruit and also important factors for determining the sale price of the jujube. The data in Table 6 show that the average single fruit weight of the jujube fruits treated by C2 is the highest and is obviously higher than that of the jujube fruits treated by C1 by 7.1 percent; the first-grade fruit rate of the C2 treatment is also the highest and is obviously higher than that of the C1 treatment by 16.6 percent; the inferior fruit rate of the C2 and C3 treatments is significantly lower than that of the C1 and C4 treatments; the fruit cracking rate of the C2, C3 treatments was also significantly lower than that of the C1 treatment. Therefore, compared with the traditional quick-acting fertilizer, the controlled-release fertilizer is applied as the base fertilizer for 1 time before the jujube tree sprouts, and under the condition that the fertilizing amount is reduced by 20 percent, the single fruit weight and the first-grade fruit rate of the jujube fruits are obviously improved, and the inferior fruit rate and the fruit cracking rate are obviously reduced.
Table 6: influence of different fertilization treatments on commodity quality of jujube trees
All the figures referred to in the drawings need to be labeled in the corresponding positions of the embodiments, and any reference numerals and corresponding conclusion explanation are not mentioned above
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made while remaining within the scope of the present invention.
Claims (5)
1. The controlled release formula fertilizer special for the fruit trees is characterized by comprising coated urea, coating liquid, granular phosphate fertilizer, granular potash fertilizer and filler, which are crushed according to a proportion and then uniformly mixed and granulated.
2. The controlled-release formulated fertilizer special for fruit trees according to claim 1, wherein the fertilizer comprises 10-40 parts by weight of coated urea and P2O56-10 parts of CaO, 8-30 parts of CaO, 5-20 parts of MgO and K210-20 parts of O, 0.2-0.6 part of zinc sulfate, 0.2-0.6 part of borax and 5-20 parts of filling material.
3. The controlled-release formulated fertilizer special for fruit trees according to claim 1, wherein the fertilizer comprises 30 parts of coated urea P2O58 parts of CaO 25 parts, MgO 12 parts and K218 portions of O, 0.4 portion of zinc sulfate, 0.4 portion of borax and 15 portions of filling material oxidized lignin.
4. The controlled-release formulated fertilizer special for fruit trees as claimed in claim 1, wherein the filler is one or more of calcium sulfate, magnesium sulfate, phenolic resin and oxidized lignin.
5. A preparation method of a special controlled-release formula fertilizer for fruit trees comprises the following specific steps:
(1) mixing the following components in a mass ratio of 1: 1.1: 0.5 of chitosan, glycerol and beeswax are dissolved in an organic solvent to prepare a coating liquid;
(2) the coated urea comprises, by mass percent, N which is not less than 43%, and the release time is 90 days at the temperature of 25 ℃ and 120 days at the temperature of 15 ℃; the granular phosphate fertilizer is triple superphosphate with granularity of 1-4.75mm not less than 90%, P2O540-50%; the granular potash fertilizer is potassium sulfate with granularity of 1-4.75mm not less than 90%, K240-50% of O, 0.6-1.8% of zinc sulfate and 0.6-1.8% of borax;
(3) and (2) putting 10 parts of the coating liquid obtained in the step (1), 30 parts of coated urea, 15 parts of granular phosphate fertilizer, 18 parts of granular potash fertilizer and 15 parts of filler into a stirrer, stirring for 10-20min, and fully and uniformly mixing to obtain the controlled-release formula fertilizer special for the fruit trees.
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Application publication date: 20201009 |