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A kind of foliar barrier agent and its preparation method and application

A blocker and foliar technology, applied in the field of foliar blocker and its preparation, can solve the problems of reducing cadmium absorption, migration and accumulation, high price, high cost, etc., achieve the goal of reducing cadmium accumulation, convenient operation and use, and conducive to popularization Effect

Active Publication Date: 2020-03-31
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an in-situ passivation material, nano-hydroxyapatite has been used in the remediation of heavy metal-contaminated soils (Wang Wei et al., 2014; Xing Jinfeng et al., 2016), but due to its high price, it is not suitable for passivation remediation of heavy metal-contaminated soils. The time cost is high, so the applicant envisages using it as a foliar barrier agent for foliar spraying to reduce the absorption, migration and accumulation of cadmium by crops

Method used

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  • A kind of foliar barrier agent and its preparation method and application
  • A kind of foliar barrier agent and its preparation method and application
  • A kind of foliar barrier agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The blocking effect of different NAP concentrations on the transfer of cadmium in different parts of wheat was studied by hydroponic experiment. Wheat (Yangmai 16) was cultured from seeds without adding CdCl to the nutrient solution (Hoagland nutrient solution) for the first four days 2 , followed by CdCl-containing 2 Cultured in the nutrient solution, CdCl in the nutrient solution 2 The concentration is 0.3mg / L, cultivated to the 3-leaf stage. After the 3rd leaf stage, put all the roots of wheat into 10mM EDTA solution and wash for 5 minutes to elute the heavy metals adsorbed on the surface of wheat roots, then wash the roots of wheat with deionized water, and transfer the whole wheat to a place without adding CdCl 2 The Hoagland nutrient solution was used to continue the cultivation, and at this time, the spraying of the foliar barrier agent was started. Foliage blockers Weigh different quality nano-hydroxyapatite (NAP) with a beaker, respectively 1.23g, 3.69g and ...

Embodiment 2

[0027] Due to the small particle size of nano-hydroxyapatite, it is easy to agglomerate, and the stable time after ultrasonic dispersion is short, and it is easy to settle at the bottom of the solution. At the same time, plant leaves generally have a waxy layer and a cuticle, which affects the entry of the leaf barrier agent into the plant leaves. . Therefore, it is necessary to screen a suitable foliar adjuvant to improve the dispersibility of NAP and the ability to enter the plant. In this example, the NAP adjuvant formula was screened, and the preparation method of the NAP foliar barrier was developed. The test program is as follows: Weigh 3g of nano-hydroxyapatite (0.3%NAP) and add it to a beaker filled with about 1L of deionized water. After stirring evenly, add suitable additives and adjust the pH of different solutions, and then place the beaker Sonicate at 25°C in a constant temperature ultrasonic instrument. There are four alternative foliar additives, namely sodium...

Embodiment 3

[0031] Select sodium citrate (SC) in Example 2 as the foliar additive, the mass concentration of NAP is 0.3%, the mass concentration of sodium citrate is also 0.3%, the pH of the solution is 6.0, and the ultrasonic time is 10 minutes, and the prepared leaf NAP blocker for field trials. The field plot test was carried out in a cadmium-contaminated farmland in Yixing City, Jiangsu Province. The test rice variety was Wuyunjing 23, the soil pH was 5.39±0.28, and the Cd concentration was 0.62±0.06mg / kg. The test set up 5 groups, in addition to spraying water as the control group (CK), the NAP foliar blocker (NAP) with the optimal formula was also sprayed, as well as 0.3% zinc sulfate heptahydrate (Zn), 0.3% commercial selenium leaf Surface fertilizer (Se) and 0.3% commercial foliar silicon fertilizer (Si). Spray once at the rice heading stage and the filling stage respectively, and the spraying time is the morning or evening on a sunny day. The amount of spraying is 1 liter per p...

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Abstract

The invention discloses a foliar barrier agent as well as a preparation method and application of the foliar barrier agent. The foliar barrier agent contains hydroxyapatite serving as an effective component. A spraying method comprises the steps: carrying out spraying in a sunny and calm morning or evening, carrying out uniform spraying on the positive and negative surfaces of leaves of crops, andcarrying out spraying once in each of a heading period and a filling period, wherein the spraying amount is 33.4 L / mu. The foliar barrier agent is capable of effectively reducing the content of cadmium in crops and reducing the transfer of cadmium from other parts of the crops to grains, and the used material is safe, nonhazardous and incapable of damaging the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control and heavy metal pollution control of agricultural products, and relates to a leaf surface barrier agent for reducing cadmium accumulation of agricultural crops, a preparation method and application thereof. Background technique [0002] Cadmium (Cd) is an important environmental pollutant and one of the most common heavy metals. The national soil heavy metal pollution total point exceeding the standard rate is 16.1%, the cultivated land position exceeding the standard rate is 19.4%, and the soil cadmium point exceeding standard rate reaches 7.0% (national Soil Environment Bulletin, 2014). Cadmium is a pollutant with the highest rate of exceeding the standard among all pollutants. After being absorbed by crops, cadmium is enriched in the kidney and liver of the human body through the food chain and affects human health, leading to high blood pressure, kidney and liver damage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G7/06
CPCA01G7/06
Inventor 杨杰仓龙王霞周东美
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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