CN112679271A - Wheat grain lead control agent and preparation and application methods thereof - Google Patents
Wheat grain lead control agent and preparation and application methods thereof Download PDFInfo
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Abstract
The invention provides a wheat grain lead control agent and a preparation and application method thereof, wherein the wheat grain lead control agent comprises an agent A, an agent B and an agent C, wherein the agent A is prepared from the following raw materials: 6-7% of calcium phosphate and Fe3O4@ C-COOH 3-4%, nano manganese sulfate 0.1-0.3%, nano zinc sulfate 0.1-0.3%, nano magnesium sulfate 0.1-0.3%, and the balance of urea; the agent B is prepared from the following raw materials: 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe3O40.5-1% of @ C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water; the agent C is prepared from the following raw materials: 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe3O4@C‑COOH0.1‑0.3％，0.5-1.5% of alkyl naphthalene sulfonate and the balance of water; also provided is a method of applying a lead control agent, comprising the steps of: s1: after wheat is turned green, applying the agent A into wheat soil; s2: after wheat is pulled out of the nodes, the agent B is sprayed on wheat leaves; s3: after the wheat is grouted, the agent C is sprayed on the wheat leaves. The lead control agent and the application method provided by the invention can realize atmosphere-soil two-end cooperative lead control on wheat, and are harmless to the environment and human body.
Description
Technical Field
The invention belongs to the technical field of environmental pollution treatment, and particularly relates to a wheat grain lead control agent and a preparation method and an application method thereof.
Background
With the rapid advance of industrialization and urbanization, the phenomenon of heavy metal pollution of grains is increasingly prominent, and once heavy metals enter crops, the heavy metals can damage human health through a food chain. The pollution phenomenon of lead in wheat is common and is a heavy metal element with the highest accumulation rate in soil. Wheat is the third crop of the world second to rice and corn, is the main dietary component of residents in China, and is also considered as one of the main sources of lead intake of human bodies. Therefore, it is very important to scientifically prevent and control the lead pollution of wheat and ensure the health, quality and safety of grains. At present, researches on the wheat lead pollution control technology, such as lead-polluted soil remediation and wheat lead low-accumulation variety screeningAnd the like, wherein the emphasis is mainly on the migration and transportation process of lead in a soil-plant system. However, the wheat can directly absorb lead in the atmospheric dustfall through the overground parts such as the leaves and the ears. The absorption of lead from atmospheric dustfall by plant leaves may be a combined result of hydrophilic and solid-state absorption pathways, depending on the solubility and particle size of lead in atmospheric particulates, the available chemicals on the plant surface, and weather conditions. Such as: the contribution rate of atmospheric dust fall near certain industrial area in northwest China to the lead of the wheat grains reaches 90-99%. The contribution rate of atmospheric particulates in Jiaxing area of Zhejiang to lead in wheat grains is 80.82%. According to the application group, the lead isotope tracing technology is adopted to research the contribution rate of atmospheric dust fall to wheat grains in the periphery of a certain lead-zinc smelting plant (lead high dust fall area) in the province of Henan of the major wheat producing area and the suburb of Zhengzhou province (lead low dust fall area), the contribution rate of atmospheric dust fall to the wheat grains in the suburb of Zhengzhou province is 77% -90%, the contribution rate of atmospheric dust fall to the wheat grains in the periphery of the certain lead-zinc smelting plant of the economic source is about 83%, comparison tests of different exposure degrees of atmospheric dust fall are carried out on the field wheat, the proportion of lead content of wheat tissues and lead content of the dust fall from the atmosphere can be obviously reduced after the field wheat is subjected to atmospheric dust fall non-exposure treatment after the green return period, and the lead content of the grains is 0.65 +/-0.033 mg.kg-1Reducing to 0.07 +/-0.031 mg/kg-1The contribution rate of atmospheric dustfall to lead of the wheat grains is reduced from 79.89% to 54.68%, and the atmospheric dustfall is directly proved to be one of main sources of lead in the wheat grains. Meanwhile, the application group also finds that the filling period after wheat blossoms is a key period for absorbing the lead of the wheat grains, and the spikes have important contribution to the accumulation of the lead of the wheat grains. The ears are on the top canopy of the plant, so the light receiving condition is good, atmospheric dust fall is easily blocked, and lead in the atmospheric dust fall is more conveniently absorbed. Due to the principle of 'nearby transportation' of the photosynthetic products, compared with the leaf under the spike, the distance from the photosynthetic products at the spike to the seeds is shortest, and the transportation efficiency is highest. These characteristics also determine that lead absorbed at different parts of the ear may be more likely to migrate rapidly into the kernel with transport of the ear's grouting material. Research shows that the yield of the wheat is reduced by only 13.25 percent after all leaves are cut off in the filling period,the lead content of the wheat grains is obviously reduced by 22.10 percent (P)<0.05) and combining with isotope analysis, the proportion of lead derived from atmospheric dust fall in the wheat grains treated by cutting the whole leaves is only reduced by 11.03 percent compared with a control group, and the contribution rates of wheat root, leaf and ear organs to the lead of the wheat grains are respectively 31.04 percent, 32.58 percent and 36.02 percent. Therefore, in the research and development of the technology for preventing and controlling the lead pollution of the wheat grains, the contribution of leaves and spikes to the lead in the wheat grains needs to be considered.
However, the existing technologies and prevention and control products focus on prevention and control of lead absorption in soil, but neglect the contribution of atmospheric dust fall to the lead content of wheat grains, and a wheat grain lead control technology with atmospheric dust fall-soil two-end cooperative prevention and control is still lacking.
Disclosure of Invention
In order to solve the problems, the invention provides a wheat grain lead control agent and a preparation method and an application method thereof.
The invention provides a wheat grain lead control agent, which consists of A, B, C three components, wherein an agent A is prepared from the following raw materials in percentage by mass:
6-7% of calcium phosphate and Fe3O4@ C-COOH 3-4%, nano manganese sulfate 0.1-0.3%, nano zinc sulfate 0.1-0.3%, nano magnesium sulfate 0.1-0.3%, and the balance of urea;
the agent B is prepared from the following raw materials in percentage by mass:
0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe3O40.5-1% of @ C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water;
the agent C is prepared from the following raw materials in percentage by mass: 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe3O40.1 to 0.3 percent of @ C to COOH, 0.5 to 1.5 percent of alkyl naphthalene sulfonate and the balance of water.
The invention also provides a preparation method of the wheat grain lead control agent, wherein the preparation method of the agent A comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 6-7% of calcium phosphate and Fe3O4@ C-COOH 3-4% and nano sulfurManganese acid 0.1-0.3%, zinc sulfate 0.1-0.3%, magnesium sulfate 0.1-0.3%, and urea in balance;
s2: uniformly mixing the raw materials weighed in the step S1 to prepare an agent A;
the preparation method of the agent B comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe3O40.5-1% of @ C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water;
s2: weighing 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe in S13O40.5-1% of @ C-COOH and 0.5-1.5% of alkyl naphthalene sulfonate are sequentially added into water and ultrasonically dispersed, and the time of ultrasonic dispersion is 10-30min after each raw material is added; preparing a B agent after the ultrasonic dispersion is finished;
the preparation method of the agent C comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe3O40.1 to 0.3 percent of @ C to COOH, 0.5 to 1.5 percent of alkyl naphthalene sulfonate and the balance of water;
s2: weighing 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe in S13O40.1-0.3% of @ C-COOH and 0.5-1.5% of alkyl naphthalene sulfonate are sequentially added into water and ultrasonically dispersed, and the time of ultrasonic dispersion is 10-30min after each raw material is added; and (4) preparing the agent C after the ultrasonic dispersion is finished.
The invention also provides an application method of the wheat grain lead control agent, which comprises the following steps:
s1: in the wheat green turning period, the agent A is applied to wheat soil as an additional fertilizer, and the application amount is 8-10 kg/mu;
s2: in the jointing stage of wheat, diluting the agent B with 50 times of volume of distilled water, and spraying the agent B on wheat leaves for 3-5 times, wherein the application amount of the agent B sprayed each time is 0.5 kg/mu;
s3: in the filling period of wheat, the agent C is diluted by distilled water with the volume of 50 times and then sprayed on the leaves of the wheat for 3-5 times, and the application amount of the agent C sprayed each time is 0.2 kg/mu.
Preferably, the spraying interval of the agent B is 19-21 days, and the spraying time is 6-8 am.
Preferably, the spraying interval of the agent C is 5-7 days, and the spraying time is 6-8 am.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the wheat grain lead control technology based on atmospheric dust fall-soil two-end cooperative prevention and control, the component A is applied to soil in the anti-green period, the lead in the soil can be solidified while the wheat is subjected to topdressing, and absorption competition is carried out on the nano manganese sulfate, the nano zinc sulfate and the nano magnesium sulfate in the component A and the lead so as to reduce the absorption of the wheat root system to the lead in the soil; the component B is sprayed on the wheat leaves in the jointing stage, so that the bioavailability of lead in atmospheric dust fall adsorbed on the surfaces of tissues such as the leaves can be reduced, the absorption of the leaves on heavy metal lead in the atmospheric dust fall can be directly cut off, meanwhile, the nano magnesium sulfate in the component B enters each tissue in the wheat body through pores of the leaves and is chelated with lead ions of the tissues in the wheat body to form a nontoxic compound, and the migration of the lead to the spike part in the wheat body is reduced; after wheat blooms, the component C is sprayed on the ear of wheat, so that the bioavailability of lead in atmospheric dust fall adsorbed on the surfaces of tissues such as awns and Yingshu of the ear of wheat can be reduced, the absorption of the ear of wheat on the lead in the atmospheric dust fall can be directly cut off, and meanwhile, the nano manganese sulfate and the nano zinc sulfate in the component C enter each tissue of the ear of wheat through an air hole of the ear of wheat and compete with the lead absorbed by roots and transported to the tissue of the ear of wheat for an absorption and transportation channel, so that the Pd content of grains can be efficiently and remarkably reduced.
(2) The atmospheric dust reduction-soil two-end cooperative prevention and control wheat grain lead control technology provided by the invention has the advantages that the application frequency and the application amount of the lead control agent are small, the components of the lead control agent have no toxic or side effect, the normal growth and development of wheat are not influenced, the safety and the non-toxicity are realized to a human body, and the organic unification of yield increase, quality guarantee, environmental protection and ecological balance maintenance can be realized.
Drawings
FIG. 1 is a graph comparing the lead content in the wheat roots of the experimental group and the control group in example 1 of the present application;
FIG. 2 is a graph comparing the lead content of wheat leaves in the experimental group and the control group of example 1 of the present application;
FIG. 3 is a graph comparing the content of miscanthus in wheat in the experimental group and the control group in example 1 of the present application;
FIG. 4 is a comparison graph of the lead content of the wheat lemma husk of the experimental group and the control group in example 1 of the present application;
fig. 5 is a graph comparing the lead content of wheat grains of the experimental group and the control group in example 1 of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention.
The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
The preparation method of Fe3O4@ C-COOH is described in the patent of magnetic carboxylated hollow microsphere soil remediation agent, its preparation method and application (ZL 201810251832.9).
Example 1
The embodiment provides an atmosphere-soil two-end synergistic prevention and control wheat grain lead control agent, which comprises A, B, C three components, wherein the agent A is prepared from the following raw materials in percentage by mass:
calcium phosphate 6.5%, Fe3O43.5% of @ C-COOH, 0.2% of nano manganese sulfate, 0.2% of nano zinc sulfate, 0.2% of nano magnesium sulfate and the balance of urea;
the agent B is prepared from the following raw materials in percentage by mass: nano magnesium sulfate 1%, humic acid 3%, Fe3O40.5% of @ C-COOH, 1% of alkyl naphthalene sulfonate and the balance of water;
the agent C is prepared from the following raw materials in percentage by mass: 0.3% of nano manganese sulfate, 0.3% of nano zinc sulfate, 3% of humic acid and Fe3O40.2% of @ C-COOH, 1% of alkyl naphthalene sulfonate and the balanceThe amount is water.
The preparation method of the lead control agent comprises the following steps:
s1: respectively weighing the following raw materials in percentage by mass: calcium phosphate 6.5%, Fe3O43.5% of @ C-COOH, 0.2% of nano manganese sulfate, 0.2% of nano zinc sulfate, 0.2% of nano magnesium sulfate and the balance of urea;
s2: uniformly mixing the raw materials weighed in the step S1 to prepare an agent A;
the preparation method of the agent B comprises the following steps:
s1: respectively weighing the following raw materials in percentage by mass: nano magnesium sulfate 1%, humic acid 3%, Fe3O40.5% of @ C-COOH, 1% of alkyl naphthalene sulfonate and the balance of water;
s2: nano magnesium sulfate 1%, humic acid 3% and Fe in S13O40.5% of @ C-COOH and 1% of alkyl naphthalene sulfonate are sequentially added into water and ultrasonically dispersed, and the time of ultrasonic dispersion is 30min after each raw material is added; preparing a B agent after the ultrasonic dispersion is finished;
the preparation method of the agent C comprises the following steps:
s1: respectively weighing the following raw materials in percentage by mass: 0.3% of nano manganese sulfate, 0.3% of nano zinc sulfate, 3% of humic acid and Fe3O40.2% of @ C-COOH, 1% of alkyl naphthalene sulfonate and the balance of water;
s2: 0.3 percent of nano manganese sulfate, 0.3 percent of nano zinc sulfate, 3 percent of humic acid and Fe in S13O40.2% of @ C-COOH and 1% of alkyl naphthalene sulfonate are sequentially added into water and ultrasonically dispersed, and the time of ultrasonic dispersion is 30min after each raw material is added; and (4) preparing the agent C after the ultrasonic dispersion is finished.
The application method of the lead control agent comprises the following steps:
s1: in the wheat green turning period, the agent A is applied to wheat soil as an additional fertilizer, and the application amount is 9 kg/mu;
s2: in the jointing stage of wheat, diluting the agent B with distilled water with the volume of 50 times, spraying the agent B on wheat leaves for 4 times, wherein the spraying time is 7 points in the morning every 20 days, the application amount of the agent B is 0.5 kg/mu every time, if rainfall occurs after spraying, the agent B needs to be re-sprayed once the day after the rainfall day, and the operation during re-spraying is the same as that during spraying;
s3: in the wheat filling period, the C agent is diluted by distilled water with the volume of 50 times and then sprayed on wheat leaves for 4 times, the spraying interval is 6 days every time, the spraying time is 7 points in the morning, the application amount of the C agent is 0.2 kg/mu every time of spraying, if rainfall occurs after spraying, the C agent needs to be re-sprayed once the day after the rainfall occurs, and the operation during re-spraying is the same as that during spraying.
Example 2
The raw materials and operations in this example were the same as in example 1, except that:
the A agent contains 88.1 percent of urea, 7 percent of calcium phosphate, 4 percent of Fe3O4@ C-COOH, 0.3 percent of nano manganese sulfate, 0.3 percent of nano zinc sulfate and 0.3 percent of nano magnesium sulfate;
the content of the nano magnesium sulfate in the agent B is 0.5 percent, the content of the humic acid is 2 percent, and the content of the alkyl naphthalene sulfonate is 0.5 percent; spraying at intervals of 19 days each time;
the C agent contains 0.2% of nano manganese sulfate, 0.2% of nano zinc sulfate, 2% of humic acid and Fe3O40.1% of @ C-COOH content and 0.5% of alkyl naphthalene sulfonate content; the spraying interval is 7 days.
Example 3
The raw materials and operations in this example were the same as in example 1, except that:
the agent A contains 90.7% of urea, 6% of calcium phosphate and Fe3O43% of @ C-COOH, 0.1% of nano manganese sulfate, 0.1% of nano zinc sulfate and 0.1% of nano magnesium sulfate;
the B agent contains 1.5% of nano magnesium sulfate, 4% of humic acid and Fe3O4The content of @ C-COOH is 1 percent, the content of alkyl naphthalene sulfonate is 1.5 percent, and the spraying interval is 21 days every time;
the content of nanometer manganese sulfate in the C agent is 0.4 percent, and the nanometer zinc sulfate0.4% of humic acid, 4% of Fe3O4The content of @ C-COOH is 0.3%, the content of alkyl naphthalene sulfonate is 1.5%, and every spraying interval is 5 days.
Example 1 has similar but more prominent beneficial effects than examples 2-3, and example 1 is now used as a preferred example to illustrate its performance. The A, B, C three components prepared in example 1 are respectively applied to farmland low Pb dust-fall areas near Zhengzhou urban areas and farmlands near certain lead-zinc smelting plants as lead dust-fall typical areas, the content of Zhengzhou atmospheric dust-fall lead fluctuates between 89.23 and 104.76mg/kg, and the content of economic atmospheric dust-fall lead fluctuates between 785.81 and 984.59mg/kg, and the lead dust-fall areas respectively represent the typical areas with high and low atmospheric lead dust-fall. Selecting field wheat of Zhengzhou (low dust drop area) and economic source (high dust drop area) randomly after spring, testing the field wheat by using the lead control agent and the application method thereof provided by the embodiment 1 of the application, and recording the field wheat as an experimental group; meanwhile, the field wheat is randomly selected from two places without treatment and is marked as a control group.
It can be seen from the data obtained by statistics that, after the wheat grain lead control technology for the atmosphere-soil two-end cooperative prevention and control provided by the embodiment is applied:
regarding wheat in zhengzhou region (low dust drop zone):
the Pb content of the wheat root is respectively reduced by 29.44%, 31.24%, 30.28% and 30.25% in the green turning period, the jointing period, the filling period and the maturation period, as shown in figure 1;
the Pb content of the wheat leaves in the green turning period, the jointing period, the filling period and the maturation period is respectively reduced by 10.47%, 43.37%, 48.34% and 59.36%, as shown in figure 2;
the Pb content of the wheat awn is respectively reduced by 78.15 percent and 80.21 percent in the grouting period and the mature period, as shown in figure 3;
the Pb content of the husk of the wheat is respectively reduced by 79.18 percent and 81.21 percent in the grouting period and the maturation period, as shown in figure 4;
the Pb content of the wheat grains is respectively reduced by 78.83% and 79.62% in the grouting period and the mature period, as shown in figure 5;
wheat in the economic region (high dust fall region):
the Pb content of the wheat root is respectively reduced by 23.26%, 28.71%, 29.99% and 30.38% in the green turning period, the jointing period, the filling period and the maturation period, as shown in figure 1;
the Pb content of the wheat leaves in the green turning period, the jointing period, the filling period and the maturation period is respectively reduced by 14.22%, 45.36%, 47.72% and 53.03%, as shown in figure 2;
the Pb content of the wheat miscanthus is respectively reduced by 77.23 percent and 79.94 percent in the grouting period and the mature period, as shown in figure 3;
the Pb content of the husk of the wheat is respectively reduced by 75.30 percent and 82.34 percent in the grouting period and the maturation period, as shown in figure 4;
the Pb content of the wheat grains is respectively reduced by 80.68% and 82.19% in the filling period and the mature period, as shown in figure 5.
The data show that the lead control technology provided by the invention can effectively reduce the lead content of the wheat ear tissues and the wheat grains, and prevent and control the atmospheric dust fall-lead pollution of the two ends of the soil to the wheat grains.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that such changes and modifications be included within the scope of the appended claims and their equivalents.
Claims (7)
1. The wheat grain lead control agent is characterized by comprising an agent A, an agent B and an agent C, wherein the agent A is prepared from the following raw materials in percentage by mass:
6-7% of calcium phosphate and Fe3O43-4% of @ C-COOH, 0.1-0.3% of nano manganese sulfate, 0.1-0.3% of nano zinc sulfate, 0.1-0.3% of nano magnesium sulfate and the balance of urea;
the agent B is prepared from the following raw materials in percentage by mass:
0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe3O40.5-1% of @ C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water;
the agent C is prepared from the following raw materials in percentage by mass: 0.2-0.4% of nano manganese sulfate and nano0.2-0.4% of rice zinc sulfate, 2-4% of humic acid and Fe3O40.1 to 0.3 percent of @ C to COOH, 0.5 to 1.5 percent of alkyl naphthalene sulfonate and the balance of water.
2. The wheat grain lead control agent as claimed in claim 1, wherein the preparation method of the agent A comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 6-7% of calcium phosphate and Fe3O4@ C-COOH 3-4%, nano manganese sulfate 0.1-0.3%, nano zinc sulfate 0.1-0.3%, nano magnesium sulfate 0.1-0.3%, and the balance of urea;
s2: and (4) uniformly mixing the raw materials weighed in the S1 to prepare the agent A.
3. The wheat grain lead control agent as claimed in claim 1, wherein the preparation method of the agent B comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe3O40.5-1% of @ C-COOH, 0.5-1.5% of alkyl naphthalene sulfonate and the balance of water;
s2: weighing 0.5-1.5% of nano magnesium sulfate, 2-4% of humic acid and Fe in S13O40.5-1% of @ C-COOH and 0.5-1.5% of alkyl naphthalene sulfonate are sequentially added into water and ultrasonically dispersed, and the time of ultrasonic dispersion is 10-30min after each raw material is added; and (4) preparing the agent B after the ultrasonic dispersion is finished.
4. The wheat grain lead control agent as claimed in claim 1, wherein the preparation method of the agent C comprises the following steps:
s1: weighing the following raw materials in percentage by mass: 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe3O40.1 to 0.3 percent of @ C to COOH, 0.5 to 1.5 percent of alkyl naphthalene sulfonate and the balance of water;
s2: weighing 0.2-0.4% of nano manganese sulfate, 0.2-0.4% of nano zinc sulfate, 2-4% of humic acid and Fe in S13O40.1-0.3% of @ C-COOH and alkylSequentially adding 0.5-1.5% of naphthalenesulfonate into water and performing ultrasonic dispersion, wherein the ultrasonic dispersion time is 10-30min after each raw material is added; and (4) preparing the agent C after the ultrasonic dispersion is finished.
5. The application method of the wheat grain lead control agent as claimed in claim 1, which comprises the following steps:
s1: after wheat is turned green, the agent A is applied to wheat soil as an additional fertilizer, and the application amount is 8-10 kg/mu;
s2: after wheat jointing, diluting the agent B with distilled water with the volume of 50 times, and spraying the agent B on wheat leaves for 3-5 times, wherein the application amount of the agent B sprayed each time is 0.5 kg/mu;
s3: after the wheat is grouted, the agent C is diluted by distilled water with the volume of 50 times and then sprayed on the leaves of the wheat for 3-5 times, and the application amount of the agent C sprayed each time is 0.2 kg/mu.
6. The application method of the wheat grain lead control agent as claimed in claim 5, wherein the spraying interval of the agent B is 19-21 days, and the spraying time is 6-8 am.
7. The application method of the wheat grain lead control agent as claimed in claim 5, wherein the spraying interval of the agent C is 5-7 days, and the spraying time is 6-8 am.
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Application publication date: 20210420 |