Search

CN-121974765-A - Strontium-rich soil conditioner with slow release function and preparation method thereof

CN121974765ACN 121974765 ACN121974765 ACN 121974765ACN-121974765-A

Abstract

The invention discloses a strontium-rich soil conditioner with a slow release function and a preparation method thereof. The modifier comprises the following raw materials, by weight, 10-30 parts of a strontium sustained-release agent, 5-10 parts of sodium alginate, 0.5-3 parts of citric acid, 2-8 parts of bacillus and 1-5 parts of an auxiliary agent. The strontium slow release agent is prepared by calcining a porous carrier, modifying the porous carrier by acid, carrying out conventional impregnation with strontium impregnating solution, then adding ethylenediamine tetraacetic acid and polyacrylamide compound activating agent for activation impregnation, and carrying out solid-liquid separation and drying. The modifier prepared by the invention can realize gradient slow release of strontium, effectively improve the bioavailability of strontium in soil through the synergistic chelation and acidification of sodium alginate and citric acid, promote the absorption and transportation of strontium by crops, improve the microecological environment of the soil, and is suitable for large-scale production of strontium-enriched agricultural products.

Inventors

  • Song Guanzhang
  • SHI JUNLING
  • LI YUEHUA
  • MU XIAOMING
  • ZHAO YU
  • JIN YUE
  • BIAN DAYONG
  • ZUO LIANG
  • ZHANG GANG
  • YANG LI
  • WU BING
  • YAO XU
  • Zheng Qiulei
  • WANG XINJUN
  • ZHU XIAOTAN
  • LI JING
  • YU LILI
  • LIU WEI
  • LI HONGWEI
  • REN ZHIWEI
  • SUN YANBIN
  • HE XINGCHEN
  • HU LINSHAN

Assignees

  • 天津华勘检验测试有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (8)

  1. 1. The strontium-rich soil conditioner with the slow release function is characterized by comprising the following raw materials, by weight, 10-30 parts of strontium slow release agent, 5-10 parts of sodium alginate, 0.5-3 parts of citric acid, 2-8 parts of bacillus and 1-5 parts of binder; The preparation method of the strontium sustained release agent comprises the following steps: (1) Preparing strontium impregnating solution, mixing the activating carrier and the strontium impregnating solution according to a solid-liquid ratio of 1:8-1:18, stirring and impregnating for 3-10h, adding an activating agent to carry out impregnating for 1-5h, carrying out solid-liquid separation, and drying to obtain a strontium slow-release agent, wherein the activating agent is selected from the combination of ethylenediamine tetraacetic acid and polyacrylamide in a mass ratio of 1-3:0.1-0.5, and the adding amount is 0.5% -3% of the mass of the strontium impregnating solution; the porous carrier in the step (1) is one or more of zeolite, diatomite, perlite, vermiculite, sepiolite or biochar; the bacillus is at least one of bacillus subtilis, bacillus mucilaginosus, bacillus amyloliquefaciens and bacillus megaterium.
  2. 2. The strontium-enriched soil conditioner with a slow release function according to claim 1, wherein the calcination temperature in the step (1) is 450-750 ℃ and the calcination time is 3-5 hours, and the dilute acid in the step (1) is modified to be soaked with 0.1-0.5mol/L hydrochloric acid or nitric acid for 1-3 hours.
  3. 3. The strontium-rich soil conditioner with a slow release function as claimed in claim 1, wherein the strontium impregnation liquid is a soluble strontium salt solution with a concentration of 0.2-0.8mol/L.
  4. 4. A strontium-rich soil conditioner with a slow release function as claimed in claim 3, wherein the soluble strontium salt solution is at least one of a strontium chloride solution or a strontium nitrate solution.
  5. 5. The strontium-enriched soil conditioner with a slow release function according to any one of claims 1 to 3, wherein the soaking temperature in the step (2) is 35 to 55 ℃, the stirring speed is 180 to 300r/min, and the drying temperature is 80 to 100 ℃.
  6. 6. A strontium-rich soil conditioner having a slow release function as claimed in any of claims 1-3, wherein said binder is selected from at least one of sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, starch, guar gum, polyvinyl alcohol.
  7. 7. The method for preparing the strontium-enriched soil conditioner with the slow release function according to any one of claims 1 to 6, which is characterized by comprising the following steps of stirring and mixing 10 to 30 parts of strontium slow release agent, 5 to 10 parts of sodium alginate, 0.5 to 3 parts of citric acid, 2 to 8 parts of bacillus and 1 to 5 parts of binder to obtain the strontium-enriched soil conditioner.
  8. 8. Use of a strontium-enriched soil conditioner with a slow release function according to any one of claims 1-6 in crop planting, wherein the strontium-enriched soil conditioner is applied to the soil as a base fertilizer or an additional fertilizer, and the application amount is 20-200 kg/mu.

Description

Strontium-rich soil conditioner with slow release function and preparation method thereof Technical Field The invention relates to the technical field of soil improvement and agriculture, in particular to a strontium-rich soil conditioner capable of effectively improving the strontium content in crop fruits, a preparation method thereof and application thereof in strontium-rich planting of agricultural products. Background Strontium is one of 14 microelements necessary for human body, the daily intake requirement of human body for strontium comes from food, but the strontium content in most foods is very low, the strontium content in meat, potato, fruit and milk products is lower than 1mg/kg, and the strontium content in rhizome vegetables and seafood is slightly higher, about 1-4mg/kg. Therefore, developing strontium-rich agricultural products has important significance for meeting the strontium nutritional requirements of human bodies. The strontium element in the soil exists mainly in various forms including a residue state, an exchangeable state, a carbonate bonding state, a ferro-manganese oxide bonding state, an organic bonding state and the like. Studies show that strontium shows similar morphological distribution in different geological soil samples, and the strontium is mainly in a residue state, wherein the residue state content of the strontium can be as high as 79%. This bound strontium element is difficult to be directly absorbed and utilized by plants, resulting in low strontium content in crop fruits, although the soil contains a certain amount of strontium. At present, a method of directly adding inorganic strontium and a base fertilizer into soil is mainly adopted for the production of strontium-enriched agricultural products to promote the strontium enrichment of crops. However, the method has obvious limitations that firstly, the directly added strontium is easy to form strontium salt precipitate with carbonate or sulfate radical plasma in the soil, not only the strontium-rich effect on crops is not achieved, but also heavy metal pollution is possibly caused to the soil due to excessive accumulation, and secondly, a large amount of combined strontium existing in the soil cannot be effectively utilized, so that resource waste is caused. In recent years, some researchers have begun focusing on the activation technique of strontium element. For example, chinese patent document CN118060325A uses S2-8-1 bacteria to strengthen ryegrass to enrich heavy metal strontium in soil, and the metabolism of S2-8-1 bacteria makes the soil become weak acid, so that solid or indissolvable Sr in the soil is converted into easily water-soluble strontium salt through hydration and hydrolysis. In addition, the Chinese patent document CN 116286003B adopts potassium fulvate as a strontium activator to convert strontium in soil from a combined state into an effective state, and test results show that the activation efficiency of the potassium fulvate on the strontium in the soil can reach 22.7-28.0%. However, the prior art still has the defects that the prior art aims at repairing strontium polluted soil instead of strengthening strontium nutrition in agricultural production, the activation effect is limited and is difficult to meet the requirement of large-scale agricultural production, the chemical reagent used by the prior art possibly causes secondary pollution to the environment, and the prior art mainly adopts leaf surface spraying and other modes, so that the problems of high application cost, unstable effect and the like are solved. Therefore, the strontium-rich soil conditioner with a slow release function is developed, strontium is converted into effective strontium in an easy-to-absorb state, and the strontium-rich soil conditioner has important practical significance and application value for improving the strontium content of crops and producing strontium-rich agricultural products. Disclosure of Invention The invention aims to provide a strontium-rich soil conditioner with a slow release function and a preparation method thereof, which are used for solving the problems of low strontium absorption efficiency and poor soil strontium bioavailability of crops in the prior art. The method promotes the high-efficiency load of strontium in the porous carrier by selecting a specific activator, realizes the gradient slow release of strontium, and is beneficial to long-acting absorption of plants. In the first aspect, the invention provides a strontium-rich soil conditioner with a slow release function, which comprises the following raw materials, by weight, 10-30 parts of a strontium slow release agent, 5-10 parts of sodium alginate, 0.5-3 parts of citric acid, 2-8 parts of bacillus and 1-5 parts of a binder. Preferably, the preparation method of the strontium sustained release agent comprises the following steps: (1) The preparation method comprises the steps of (1) crushing a porous carrier, sieving with a