CN116082867A - Inorganic nano fruit protective agent, preparation method and use method - Google Patents

Abstract

The invention relates to the technical field of planting, in particular to an inorganic nano fruit protective agent, a preparation method and a use method thereof; the inorganic nano fruit protectant comprises the following raw materials: a coating agent, a stabilizer, an additional functional agent and water; the preparation process of the inorganic nano fruit protective agent comprises the following steps: and (3) taking a certain amount of water, controlling the water temperature at 40-90 ℃, adding a stabilizer into the water to obtain a first mixture, adding a coating agent into the first mixture according to the weight, stirring and mixing to obtain a second mixture, adding an additional functional agent into the second mixture according to the weight ratio, mixing and stirring to obtain the inorganic nano fruit protective agent, adding water into the inorganic nano fruit protective agent to dilute the inorganic nano fruit protective agent to obtain a diluent, carrying out primary spraying on fruits at the primary growing stage of the fruits, carrying out primary spraying on the fruits, and carrying out repeated spraying on the fruits according to the situation, and then spraying once every 15-50 days.

Description

Inorganic nano fruit protective agent, preparation method and use method

Technical Field

The invention relates to the technical field of planting, in particular to an inorganic nano fruit protective agent, a preparation method and a use method thereof.

Background

The fruit bagging technology aims at reducing the occurrence of diseases and insect pests such as the borer and the pesticide residue, and the fruit bagging can improve the smoothness of the fruit surface of the fruit to a great extent and reduce the diseases and insect pests. However, the fruit bagging technology has the following problems: 1. the cost of fruit bagging is increased increasingly, taking the most apples to be bagged at present as an example, the cost of fruit bagging, the labor cost of bagging and the labor cost of bag picking are increased, and a reflective film is paved for better coloring of the apples in a short time, so that the cost of the reflective film and the labor cost of paving and recycling are increased, and the direct cost of bagging directly accounts for 30% -50% of fruit price; 2. whether bagging or bag picking is carried out, a ladder is required to be erected to climb up and climb down, and old people cannot operate the bag; 3. fruit bagging can separate fruit and accept photosynthesis, so that some flavor substances can not be synthesized, the taste and nutrition of the fruit are reduced, meanwhile, the bagging can also influence the sugar degree of the fruit to be obviously reduced, the storage resistance of the fruit is influenced, if a paper bag is adopted, the leaf surface can be shielded, the photosynthesis of the whole tree is influenced, and further the size and the whole yield of the fruit are influenced.

The development of fruit bagging-free technology is a method and technology for effectively replacing fruit bagging, wherein in the fruit bagging-free technology, a film layer is formed on the surface of the fruit by spraying a film agent, so that the fruit bagging-free technology plays the same role as bagging. In some of the presently disclosed patents, various organic components exist for fast and uniform film formation, for example, a mixture of various organic substances such as chitosan, welan gum, gelatin, glycerol, enzymes and the like is adopted in the invention patent CN115232561a, and acetic acid, chitosan, glycerol and humic acid solution are adopted in the invention patent CN 107155739B. Some even use surfactants such as tween-20 and span-20 in invention patent CN 112980253B; in the invention CN110229612B, sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether, and the like are used. The most direct organic component contained in the film is high in cost, the existence of the organic component can influence the food safety, and meanwhile, bacteria are easy to grow and fruit rot is easy to cause.

For this reason, in order to further satisfy the urgent need for fruit bagging, further research into protective agents for fruit bagging is required.

Disclosure of Invention

The invention aims to provide an inorganic nano fruit protective agent, a preparation method and a use method thereof, which can meet the urgent need of bagging-free fruits.

In order to achieve the aim, the inorganic nano fruit protective agent adopted by the invention comprises the following raw materials in percentage by mass:

1% -25% of coating agent, 0.01% -5% of stabilizer, 0.001% -10% of additional functional agent and water, wherein the sum of the mass fractions of the coating agent, the stabilizer, the additional functional agent and the water is 100%.

The coating agent is one or more of magnesium-based substances, calcium-based substances, silicon-based substances and titanium-based substances, and the particle sizes of the magnesium-based substances, the calcium-based substances, the silicon-based substances and the titanium-based substances are 1-60000 nm.

Wherein the magnesium-based substance is one or a combination of more magnesium-containing substances such as magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesite, dolomite, bischofite, carnallite and the like.

Wherein the calcium-based material is one or more of shell powder, pearl powder, calcite powder, calcium carbonate, calcium sulfate, calcium phosphate and other calcium-containing materials.

The silicon-based substances are one or a combination of more of silicon-containing substances such as silicon dioxide, silicon carbonate, quartz sandstone, quartz rock and the like.

Wherein the titanium-based material is mainly titanium dioxide.

Wherein the stabilizer is one or more of aluminum silicate, aluminum chloride, sodium silicate, phosphate and the like.

Wherein the additional functional agent is one or more of sodium selenate, sodium selenite, boric acid, potassium dihydrogen phosphate, magnesium sulfate, ammonium nitrate, calcium nitrate and calcium chloride.

The invention also provides a preparation method of the inorganic nano fruit protective agent, which comprises the following steps:

controlling the water temperature of a certain amount of water to be 40-90 ℃;

adding the stabilizer into the water, and stirring for 5-30 min to obtain a first mixture;

adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 0.5-72 h to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

adding the additional functional agent into the second mixture according to the weight ratio, and mixing and stirring for 0.5-2 h to obtain the inorganic nano fruit protective agent;

and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

The invention also provides a use method of the inorganic nano fruit protective agent, which comprises the following steps:

diluting the inorganic nano fruit protective agent by 2-20 times by adding water, and uniformly stirring to obtain a diluent;

in the preliminary growing period of fruits, the diluent is used for carrying out first spraying, the fruit surfaces are sprayed with emphasis, after the first spraying of the fruit surfaces is dried, the spraying can be repeated for 1-3 times according to the situation, and then the spraying is carried out once every 15-50 days;

the spraying environment is the morning and afternoon of sunny weather, the spraying is not carried out in rainy days under the condition of rainfall within 3 hours, and the spraying is carried out for 1-2 times under the condition of large rainfall.

According to the inorganic nano fruit protective agent, the preparation method and the using method, the inorganic nano fruit protective agent can form a uniform protective film on the surface of a fruit to play a role in protecting the fruit, the use of pesticides can be effectively reduced due to the existence of the external protective film, and the inorganic nano fruit protective agent can be directly contacted with the surface and the leaf surface of the fruit in the spraying process, so that the added value of the fruit can be improved due to the addition of the additional functional agent, the inorganic nano fruit protective agent does not contain any organic component, and the inorganic nano fruit protective agent is safe, reliable, simple to operate and use, low in cost, capable of effectively improving the quality and the yield of the fruit, and capable of meeting the urgent demands of avoiding bagging of the fruit.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of the steps of a first embodiment of the present invention.

Fig. 2 is a flow chart of the steps of a second embodiment of the present invention.

Fig. 3 is a flow chart of steps of a third embodiment of the present invention.

Fig. 4 is a flow chart of the steps of a fourth embodiment of the present invention.

Fig. 5 is a flow chart of the steps of the method of using the inorganic nano-fruit protectant of the invention.

Detailed Description

The first embodiment is:

referring to fig. 1, fig. 1 is a flowchart illustrating steps of a first embodiment.

The invention provides an inorganic nano fruit protective agent which comprises the following raw materials in parts by mass:

12% of coating agent, 1% of stabilizing agent, 0.3% of additional functional agent and 86.7% of water.

Further, the coating agent is silicon dioxide with the diameter of 1-2000 nm, the stabilizer is sodium silicate, and the additional functional agent is boric acid.

The invention also provides a preparation method of the inorganic nano fruit protective agent, which comprises the following steps:

s111: controlling the water temperature of a certain amount of the water to be 60 ℃;

s112: adding the stabilizer into the water, and stirring for 20min to obtain a first mixture;

s113: adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 24 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

s114: adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 0.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent;

s115: and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

In this embodiment, the coating agent is 12%, the stabilizer is 1%, the additional functional agent is 0.3% and the water is 86.7%, wherein the coating agent is silica with a diameter of 1-2000 nm, the stabilizer is sodium silicate, the additional functional agent is boric acid, and the preparation process of the inorganic nano fruit protectant is as follows: controlling the water temperature of a certain amount of the water to be 60 ℃; adding the stabilizer into the water, and stirring for 20min to obtain a first mixture; adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 24 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature; adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 0.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent; subpackaging the inorganic nano fruit protective agent and warehousing for later use; the inorganic nano fruit protective agent adopting the nano technology can form a uniform protective film on the surface of the fruit, plays a role in protecting the fruit, and the use of pesticides can be effectively reduced due to the existence of an external protective film.

The second embodiment is:

referring to fig. 2, fig. 2 is a flowchart illustrating steps of a second embodiment.

The invention provides an inorganic nano fruit protective agent which comprises the following raw materials in parts by mass:

14% of coating agent, 0.5% of stabilizing agent, 0.6% of additional functional agent and 84.9% of water.

Further, the coating agent is calcium carbonate and calcite powder with diameters of 1-500 nm, the ratio of the calcium carbonate to the calcite powder is 2:1, the stabilizer is aluminum chloride, and the additional functional agent is potassium dihydrogen phosphate.

The invention also provides a preparation method of the inorganic nano fruit protective agent, which comprises the following steps:

s121: controlling the water temperature of a certain amount of the water to 90 ℃;

s122: adding the stabilizer into the water, and stirring for 30min to obtain a first mixture;

s123: adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 56 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

s124: adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 1h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent;

s125: and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

In this embodiment, 14% of the coating agent, 0.5% of the stabilizer, 0.6% of the additional functional agent and 84.9% of the water, wherein the coating agent is calcium carbonate and calcite powder with diameters of 1-500 nm, the ratio of the calcium carbonate to the calcite powder is 2:1, the stabilizer is aluminum chloride, the additional functional agent is potassium dihydrogen phosphate, and the preparation process of the inorganic nano fruit protective agent comprises the following steps: controlling the water temperature of a certain amount of the water to 90 ℃; adding the stabilizer into the water, and stirring for 30min to obtain a first mixture; adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 56 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature; adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 1h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent; subpackaging the inorganic nano fruit protective agent and warehousing for later use; the inorganic nano fruit protective agent adopting the nano technology can form a uniform protective film on the surface of the fruit, plays a role in protecting the fruit, and the use of pesticides can be effectively reduced due to the existence of an external protective film.

The third embodiment is:

referring to fig. 3, fig. 3 is a flowchart illustrating steps of a third embodiment.

The invention provides an inorganic nano fruit protective agent which comprises the following raw materials in parts by mass:

8% of coating agent, 2% of stabilizing agent, 4% of additional functional agent and 86% of water.

Further, the film coating agent is magnesium oxide and silicon carbonate with diameters of 1-1500 nm, the ratio of the magnesium oxide to the silicon carbonate is 3:1, the stabilizer is sodium silicate, and the additional functional agent is ammonium nitrate.

The invention also provides a preparation method of the inorganic nano fruit protective agent, which comprises the following steps:

s131: controlling the water temperature of a certain amount of the water to 65 ℃;

s132: adding the stabilizer into the water, and stirring for 15min to obtain a first mixture;

s133: adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 12 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

s134: adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 1.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent;

s135: and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

In this embodiment, the coating agent is 8%, the stabilizer is 2%, the additional functional agent is 4% and the water is 86%, wherein the coating agent is magnesium oxide and silicon carbonate with a diameter of 1-1500 nm, the ratio of magnesium oxide to silicon carbonate is 3:1, the stabilizer is sodium silicate, the additional functional agent is ammonium nitrate, and the preparation method of the inorganic nano fruit protective agent comprises the following steps: controlling the water temperature of a certain amount of the water to 65 ℃; adding the stabilizer into the water, and stirring for 15min to obtain a first mixture; adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 12 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature; adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 1.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent; subpackaging the inorganic nano fruit protective agent and warehousing for later use; the inorganic nano fruit protective agent adopting the nano technology can form a uniform protective film on the surface of the fruit, plays a role in protecting the fruit, and the use of pesticides can be effectively reduced due to the existence of an external protective film.

The fourth embodiment is:

referring to fig. 4, fig. 4 is a flowchart illustrating steps of a fourth embodiment.

The invention provides an inorganic nano fruit protective agent which comprises the following raw materials in parts by mass:

6% of coating agent, 0.5% of stabilizing agent, 0.04% of additional functional agent and 93.46% of water.

Further, the coating agent is dolomite, calcium phosphate and silicon dioxide with diameters of 1-1500 nm, the ratio of the dolomite to the calcium phosphate to the silicon dioxide is 1:1:1, the stabilizer is sodium silicate to aluminum chloride, the ratio of the sodium silicate to the aluminum chloride is 1:2, the additional functional agent is calcium nitrate to sodium selenite, and the ratio of the calcium nitrate to the sodium selenite is 1:1.

The invention also provides a preparation method of the inorganic nano fruit protective agent, which comprises the following steps:

s141: controlling the water temperature of a certain amount of the water to 80 ℃;

s142: adding the stabilizer into the water, and stirring for 10min to obtain a first mixture;

s143: adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 72 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

s144: adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 0.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent;

s145: and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

In this embodiment, the coating agent is 6%, the stabilizer is 0.5%, the additional functional agent is 0.04% and the water is 93.46%, wherein the coating agent is dolomite, calcium phosphate and silicon dioxide with diameters of 1-1500 nm, the ratio of dolomite, calcium phosphate and silicon dioxide is 1:1:1, the stabilizer is sodium silicate and aluminum chloride, the ratio of sodium silicate to aluminum chloride is 1:2, the additional functional agent is calcium nitrate and sodium selenite, the ratio of calcium nitrate to sodium selenite is 1:1, and the preparation method of the inorganic nano fruit protective agent comprises the following steps: controlling the water temperature of a certain amount of the water to 80 ℃; adding the stabilizer into the water, and stirring for 10min to obtain a first mixture; adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 72 hours to obtain a second mixture, and waiting for the second mixture to cool to room temperature; adding the additional functional agent into the second mixture according to the weight ratio, mixing and stirring for 0.5h to obtain the inorganic nano fruit protective agent, and sterilizing the inorganic nano fruit protective agent; subpackaging the inorganic nano fruit protective agent and warehousing for later use; the inorganic nano fruit protective agent adopting the nano technology can form a uniform protective film on the surface of the fruit, plays a role in protecting the fruit, and the use of pesticides can be effectively reduced due to the existence of an external protective film.

Referring to fig. 5, fig. 5 is a flow chart showing the steps of the method for using the inorganic nano-fruit protectant.

The invention also provides a use method of the inorganic nano fruit protective agent, which comprises the following steps:

s211: diluting the inorganic nano fruit protective agent by 2-20 times by adding water, and uniformly stirring to obtain a diluent;

s212: in the preliminary growing period of fruits, the diluent is used for carrying out first spraying, the fruit surfaces are sprayed with emphasis, after the first spraying of the fruit surfaces is dried, the spraying can be repeated for 1-3 times according to the situation, and then the spraying is carried out once every 15-50 days;

s213: the spraying environment is the morning and afternoon of sunny weather, the spraying is not carried out in rainy days under the condition of rainfall within 3 hours, and the spraying is carried out for 1-2 times under the condition of large rainfall.

In the embodiment, firstly, the inorganic nano fruit protective agent is diluted by 2-20 times by adding water, the mixture is stirred uniformly to obtain a diluent, the diluent is used for carrying out primary spraying for the fruit surface in the primary growing period of the fruit, the fruit surface is sprayed for the first time, after the primary spraying for the fruit surface is dried, the spraying can be carried out for 1-3 times according to the situation, and then the spraying is carried out once every 15-50 days, wherein the spraying environment is the morning and afternoon of sunny weather, and is not sprayed in rainy days under the condition of rainfall within 3 hours, and the spraying is carried out for 1-2 times under the condition of large rainfall; the inorganic nano fruit protective agent adopting the nano technology can form a uniform protective film on the surface of the fruit, plays a role in protecting the fruit, and the use of pesticides can be effectively reduced due to the existence of an external protective film.

Test experiment 1 was:

the invention also provides an application test of the inorganic nano fruit protectant, which is designed as follows:

experiment site: the mountain western province is in Fen city, 38576 is in the county white ear village, is located in loess plateau dominant fruit producing area of 36 degrees in North latitude, has loose soil, long frost-free period, sufficient sunlight and large day-night temperature difference, has no industrial pollution in the environment, and is naturally thick, and belongs to the same producing area as the mountain western Ji county apples.

The experimental object: the Fuji 8 red apples are all 6 years old, are strong in growth vigor, have plant spacing of 2 meters and have row spacing of 3.5 meters; there are 5 columns of 20 strains each, and a total of 100 strains.

The experimental method comprises the following steps: taking the inorganic nano fruit protectants prepared in the examples 1-4, diluting with water for 3 times, and spraying 1 row of each inorganic nano fruit protectant after fully shaking up for 4 rows; meanwhile, 1 row is selected to carry out traditional paper bag bagging treatment (fruits are not sprayed with the inorganic nano fruit protective agent) to serve as a control group, 4 groups of spraying the inorganic nano fruit protective agent on the fruits and 1 group of the control group adopt the same management technology, after apples bloom and fruit bearing, when the control group carries out bagging, the other 4 groups carry out the first spraying of the inorganic nano fruit protective agent, and 2022/3836 is about 15 days before and after 6 months county. The fruit surface is sprayed to avoid the leaf surface as much as possible, the fruit surface is uniformly covered with the inorganic nano fruit protective agent, then the spraying is carried out once in 25 days, the spraying is stopped about 20 days before the apples are ripe in 10 months according to weather conditions, the spraying is carried out for 4 times in the whole period, each index is measured during the medium-term harvest in 10 months, and each group of data test is repeated for 3 times.

Experimental results and analysis:

in the growth process of apples, the apple trees sprayed with the inorganic nano fruit protective agent can obviously reduce plant diseases and insect pests such as aphids, and the like, and the leaves are black and bright and grow well. The control group without spraying the inorganic nano fruit protective agent bagging can obviously find the conditions of leaf curl, leaf burning and the like caused by aphids. Therefore, the spraying of the inorganic nano fruit protective agent can obviously increase the protective function and reduce the plant diseases and insect pests; as shown in table 1:

	fruit shape index	Hardness (kgf/cm 2)	Soluble sugar (%)	Total acid (g/kg)	Soluble solids (%)
						Control group	0.81	5.873	11.67	3.18	14.35
Example 1	0.83	6.697	13.20	3.04	14.80
						Example 2	0.85	6.267	13.22	3.23	16.20
Example 3	0.82	7.314	12.47	2.80	15.80
						Example 4	0.84	6.734	12.26	3.42	16.50

TABLE 1

As can be seen from Table 1, the apples sprayed with the inorganic nano fruit protectant are significantly different in quality from those of the apples in the conventional bagging, the apple shape index of the apples sprayed with the inorganic nano fruit protectant is slightly better than that of the apples in the bagging, but the apples in the bagging control group are slightly different, and the hardness of the apples in the bagging control group is 5.873kgf/cm ² While examples 1 to 4 of spraying the inorganic nano fruit protectant all have fruit hardness of 6kgf/cm ² The maximum value of the pressure-sensitive adhesive can reach 7.314kgf/cm ² The apple protective agent is more beneficial to improving the taste and the storage resistance, the soluble sugar content of apples in the bagging control group is 11.67%, and the soluble sugar content of the inorganic nano fruit protective agent sprayed in the examples 1-4 is larger than that in the control group, wherein the minimum soluble sugar content is 12.26%, the maximum soluble sugar content is 13.22%, and the maximum soluble sugar content is 13.3%, so that the sugar content is obviously increased, and the taste is better. The total acid content of apples in the bagging control group is 3.18g/kg, and the total acid content of the examples 1-4 of the inorganic nano fruit protectant is 3.04, 3.23, 2.80 and 3.42 respectively, and the total acid content of the inorganic nano fruit protectant is high and low respectively, but the formulas of the examples 1 and 3 can reduce the total acid content, the soluble solid content of apples in the bagging control group is 14.35%, and the soluble solid content of the examples 1-4 of the inorganic nano fruit protectant is 14.80%, 16.20%, 15.80% and 16.50% respectively, which are higher than the total sugar content, the total acid content, the vitamin content, the mineral content and other water-soluble compounds in apples in the control group, which are respectively, are higher than those of apples in the control group, which are sprayed with the inorganic nano fruit protectant, namely, the total sugar content, the total acid content, the vitamin content, the mineral content and other water-soluble compounds are far higher than those of apples in the bagging control group, and better taste.

As shown in table 2:

	yield per 20 plants (kg)	Yield increase (kg) compared with the sleeve bag	Yield increase (%)
				Control group	243	-	-
Example 1	278	35	14.4
				Example 2	285	42	17.3
Example 3	293	50	20.6
				Example 4	277	34	14.0

TABLE 2

As can be seen from table 2, the apple yields of 20 trees were counted, wherein the yield of the bagging control group was 243kg, and the apple yields of examples 1 to 4, which were sprayed with the inorganic nano-fruit protectant, were 278kg, 285kg, 293kg, 277kg, respectively, which showed a yield increase of 14.4%, 17.3%, 20.6%, 14.0% compared to the control group, respectively, which indicates that the apple yields of the inorganic nano-fruit protectant sprayed with the inorganic nano-fruit protectant were far greater than the apple yields of the bagging.

Test experiment 2 was:

the invention also provides an application test of the inorganic nano fruit protectant, which is designed as follows:

experiment site: the standard plantation of the Guanglu pear in Fen city of Shanxi province, yang Decun and Fu Xiang pear in county, is positioned in a loess plateau dominant fruit producing area of 36 degrees in North latitude, has loose soil, long frost-free period, sufficient sunlight, large day-night temperature difference, no industrial pollution in the environment and unique natural condition, and currently, the Guanglu pear has the maximum planting area in county of the Guanglu pear.

The experimental object: the tree ages of the Yulu pear are about 6 years, the pear grows well, the plant spacing is 3 meters, the row spacing is 4 meters, and 100 plants are total.

The experimental method comprises the following steps: taking the inorganic nano fruit protectants prepared in the examples 1-4, diluting with water for 3 times, and spraying 20 plants of each inorganic nano fruit protectant after fully shaking uniformly, wherein the total number of the inorganic nano fruit protectants is 4; meanwhile, 20 plants were selected for conventional paper bag bagging treatment (fruits were not sprayed with the inorganic nano fruit protectant) as a control group. And 4 groups of spraying the inorganic nano fruit protective agent and 1 group of the control group adopt the same management technology, after the Yulu pear flowers and fruits are put on, when the control group is bagged, the other 4 groups spray the inorganic nano fruit protective agent for the first time, and 2022/38576 is about 6 months and 17 days before and after county. And (3) spraying the fruit surface to avoid the leaf surface as much as possible, and uniformly covering the inorganic nano fruit protective agent on the fruit surface. And then sprayed once in 30 days, according to weather conditions. Stopping spraying about 20 days before the 9-month middle ten-day of the Yulu pear, spraying 3 times in the whole period, measuring each index when the Yulu pear is picked up in the 9-month middle ten-day, and repeating the data test for 3 times in each group.

Experimental results and analysis:

in the growing process of the Yulu bergamot pears, the Yulu bergamot pears sprayed with the inorganic nano fruit protectant can obviously reduce plant diseases and insect pests such as aphids, and the leaves are black and bright, and the growing condition is good, and is similar to the experimental result of the test experiment 1. The control group without spraying the inorganic nano fruit protective agent bagging can obviously find the conditions of leaf curl, leaf burning and the like caused by aphids. Therefore, the spraying of the inorganic nano fruit protective agent can obviously increase the protective function and reduce the plant diseases and insect pests; as shown in table 3:

	fruit shape index	Hardness (kgf/cm 2)	Soluble sugar (%)	Total acid (g/100 g)	Stone cell (g/100 g)
						Control group	0.967	4.264	8.141	1.063	16.50
Example 1	1.019	4.704	8.178	0.874	14.80
						Example 2	0.978	5.131	8.703	0.922	14.35
Example 3	0.962	4.727	9.096	0.804	15.80
						Example 4	0.991	4.395	8.404	0.918	16.20

TABLE 3 Table 3

As can be seen from Table 3, the quality of the Yulu bergamot pears sprayed with the inorganic nano fruit protectant is obviously different from that of the Yulu bergamot pears in the traditional bagging, the fruit shape index of the Yulu bergamot pears sprayed with the inorganic nano fruit protectant is slightly better than that of the Yulu bergamot pears in the bagging, but the fruit shape index and the fruit shape index are not very different, the Yulu bergamot pears belong to the top grade fruits, and the hardness of the Yulu bergamot pears in the bagging comparison group is 4.264kgf/cm ² While the fruits of examples 1-4 sprayed with the inorganic nano fruit protectant have hardness higher than that of the control group and highest 5.131kgf/cm ² More conducive to improving mouthfeel and storage resistance. The soluble sugar content of the Yulu fragrant pears of the bagging control group is 8.141%, the soluble sugar content of the examples 1-4 of spraying the inorganic nano fruit protectant is larger than that of the control group, wherein the minimum is 8.178%, the improvement is 0.5%,the maximum of 9.096% is increased by 11.7%, so that the sugar content of the inorganic nano fruit protectant is increased, but the effect of the inorganic nano fruit protectant is different, the total acid content of the Yulu fragrant pears in the bagging control group is 1.063g/100g, the total acid content of the Yulu fragrant pears in the inorganic nano fruit protectant spraying examples 1-4 is 0.874g/100g, 0.922g/100g, 0.804g/100g and 0.918g/100g respectively, the total acid content of the inorganic nano fruit protectant spraying is lower than that of the bagging control group, but the formula of example 3 can obviously reduce the total acid content, the stone cells of the Yulu fragrant pears in the bagging control group are 16.50g/100g, and the stone cells of the inorganic nano fruit protectant spraying examples 1-4 are 14.80g/100g, 14.35g/100g, 15.80g/100g, 16.20g/100g respectively, which are lower than that of the control group, 10.3%, 13.4%, and 1.8% of the Yulu fragrant pears are better in taste.

The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.

Claims (10)

1. An inorganic nano fruit protective agent is characterized by comprising the following raw materials in parts by mass:

1% -25% of coating agent, 0.01% -5% of stabilizer, 0.001% -10% of additional functional agent and water, wherein the sum of the mass fractions of the coating agent, the stabilizer, the additional functional agent and the water is 100%.

2. The inorganic nano-fruit protectant according to claim 1, wherein,

the coating agent is one or more of magnesium-based substances, calcium-based substances, silicon-based substances and titanium-based substances, and the particle sizes of the magnesium-based substances, the calcium-based substances, the silicon-based substances and the titanium-based substances are all 1-60000 nm.

3. The inorganic nano-fruit protectant according to claim 2, wherein,

the magnesium-based substance is one or a combination of more of magnesium-containing substances such as magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesite, dolomite, bischofite, carnallite and the like.

4. The inorganic nano-fruit protectant according to claim 2, wherein,

the calcium-based material is one or more of shell powder, pearl powder, calcite powder, calcium carbonate, calcium sulfate, calcium phosphate and other calcium-containing materials.

5. The inorganic nano-fruit protectant according to claim 2, wherein,

the silicon-based substance is one or a combination of more of silicon-containing substances such as silicon dioxide, silicon carbonate, quartz sandstone, quartz rock and the like.

6. The inorganic nano-fruit protectant according to claim 2, wherein,

the titanium-based material is mainly titanium dioxide.

7. The inorganic nano-fruit protectant according to claim 1, wherein,

the stabilizer is one or more of aluminum silicate, aluminum chloride, sodium silicate, phosphate and the like.

8. The inorganic nano-fruit protectant according to claim 1, wherein,

the additional functional agent is one or more of sodium selenate, sodium selenite, boric acid, potassium dihydrogen phosphate, magnesium sulfate, ammonium nitrate, calcium nitrate and calcium chloride.

9. A method for preparing the inorganic nano-fruit protectant, which is characterized by comprising the following steps:

controlling the water temperature of a certain amount of water to be 40-90 ℃;

adding the stabilizer into the water, and stirring for 5-30 min to obtain a first mixture;

adding the coating agent into the first mixture according to the weight, stirring and mixing, homogenizing for 0.5-72 h to obtain a second mixture, and waiting for the second mixture to cool to room temperature;

adding the additional functional agent into the second mixture according to the weight ratio, and mixing and stirring for 0.5-2 h to obtain the inorganic nano fruit protective agent;

and subpackaging the inorganic nano fruit protective agent and warehousing for later use.

10. A method of using the inorganic nano-fruit protectant of claim 1, comprising the steps of:

diluting the inorganic nano fruit protective agent by 2-20 times by adding water, and uniformly stirring to obtain a diluent;

in the preliminary growing period of fruits, the diluent is used for carrying out first spraying, the fruit surfaces are sprayed with emphasis, after the first spraying of the fruit surfaces is dried, the spraying can be repeated for 1-3 times according to the situation, and then the spraying is carried out once every 15-50 days;

the spraying environment is the morning and afternoon of sunny weather, the spraying is not carried out in rainy days under the condition of rainfall within 3 hours, and the spraying is carried out for 1-2 times under the condition of large rainfall.

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