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Method for calculating ion electrical conductivity (EC) contribution rate and electrical conductivity of nutrient solution based on ion activity

A technology of nutrient solution and contribution rate, which is applied in the fields of soilless cultivation technology and water and fertilizer integration, and can solve problems such as calcium ion absorption barriers

Active Publication Date: 2018-11-27
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pH is too high, it will lead to the precipitation of iron, manganese, copper, and zinc ions, especially the activity of iron ions. If the pH is too low, the antagonism of hydrogen ions will lead to the absorption of calcium ions by crops.

Method used

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  • Method for calculating ion electrical conductivity (EC) contribution rate and electrical conductivity of nutrient solution based on ion activity
  • Method for calculating ion electrical conductivity (EC) contribution rate and electrical conductivity of nutrient solution based on ion activity
  • Method for calculating ion electrical conductivity (EC) contribution rate and electrical conductivity of nutrient solution based on ion activity

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Embodiment 1 checks the ion EC contribution rate and EC of specific formula nutrient solution

[0060] According to the different needs of the crops for the concentration of the nutrient solution at each growth stage, the general nutrient solution for the garden test and the Yamazaki tomato nutrient solution were configured to be 0.20, 0.25, 0.33, 0.50, 0.67, 1.00, 1.33, 1.50, 1.80 and 2.00 times the standard concentration etc., with a total of 10 concentration gradients, the ion EC contribution rate and EC of each inorganic ion are calculated according to the method of the present invention. The nutrient solution to be tested uses Ca(NO 3 ) 2 4H 2 O. KNO 3 , MgSO 4 ·7H 2 O, NH 4 h 2 PO 4 , MnSO 4 ·H 2 O, CuSO 4 ·5H 2 O, ZnSO 4 ·7H 2 O, H 3 BO 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 Analytical pure O (Xilong Chemical Reagents, Guangdong) and distilled water (EC value 11 ± 2 μS / cm, pH value 5.82 ± 0.08) preparation, chelated iron using 7% DTPA-Fe-7 (Shanghai Yo...

Embodiment 2

[0067] Example 2 Changes in the EC contribution rate of nutrient solution ions after adding a specific monosalt

[0068] In order to test the addition of different concentrations of Ca(NO 3 ) 2 4H 2 O. KNO 3 , MgSO 4 ·7H 2 O, NH 4 h 2 PO 4 , K 2 SO 4 , KCl, and KH 2 PO 4 After the single salt, the change of the ion EC contribution rate of the main ion components in the mixed solution, the addition amount of each single salt is set to the standard concentration (based on the formula ion concentration) of 0.0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8 and 2.0 times, etc., a total of 12 concentration gradients. After preparing 100L standard nutrient solution based on the general formula of the garden test and the Yamazaki tomato formula, add the above-mentioned single salt with the concentration gradient to the nutrient solution and mix thoroughly, and make the mixed solution 1L. Shake well and store in the dark as the nutrient to be tested. liquid.

[0069] In...

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Abstract

The invention provides a method for calculating an ion electrical conductivity (EC) contribution rate and electrical conductivity of a nutrient solution of a specific formula based on ion activity inorder to reversely calculate the concentration of ions in the nutrient solution by using actual measurement of the conductivity and the ion EC contribution rate. The method can be used for the calculation of the electrical conductivity and pH of the nutrient solution of a specific formula and can inversely estimate the concentration of the ions by using the actual measurement of the conductivity of the nutrient solution, thereby providing theoretical basis and technical support for the dynamic regulation of the nutrient solution based on the ion concentration which cannot be easily achieved infacility soilless cultivation. The method is simple, can be easily operated, is high in accuracy, and can be used for the development of a nutrient solution control system, thereby meeting intelligent matching requirements of defined EC and pH and ion concentration of the nutrient solution of different crops at different growth stages and automatic control of formula adjustment.

Description

technical field [0001] The invention belongs to the field of soilless cultivation technology and water and fertilizer integration technology, and in particular relates to a method for calculating the EC contribution rate and electrical conductivity of nutrient solution ions based on ion activity. Background technique [0002] Soilless cultivation is generally recognized by the facility vegetable industry for its advantages of water saving, fertilizer saving, labor saving, and production promotion. Although the nutrient solution irrigation system based on the regulation of electrical conductivity (EC) and pH (pH) can roughly meet the needs of crop growth and development, it is difficult to guarantee the change of crop demand for specific inorganic ions in different growth stages. Therefore, whether the feedback control of nutrient solution ion concentration can be carried out according to the needs of crop growth is the key to realize the high-efficiency and high-quality prod...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31G01N27/06G01N31/227G01N31/22G01N33/18A01G31/00G16C20/30G16C20/20C05G5/23Y02P60/21
Inventor 贺冬仙宋金修徐林杜维芬古在丰树
Owner CHINA AGRI UNIV