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A method for calculating the ec contribution rate and conductivity of nutrient solution ions based on ionic activity

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

Active Publication Date: 2020-07-21
CHINA AGRI UNIV
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  • 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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  • A method for calculating the ec contribution rate and conductivity of nutrient solution ions based on ionic activity
  • A method for calculating the ec contribution rate and conductivity of nutrient solution ions based on ionic activity
  • A method for calculating the ec contribution rate and conductivity of nutrient solution ions based on ionic activity

Examples

Experimental program
Comparison scheme
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 the ion EC contribution rate and electrical conductivity of a specific formula nutrient solution based on ion activity, in order to use the actual measurement of the electrical conductivity and the ion EC contribution rate to back-calculate the concentration of each ion in the nutrient solution. This method can not only be used to calculate the conductivity and pH of a specific formula nutrient solution, but also use the actual measurement of the conductivity of the nutrient solution to reversely infer the concentration of each ion, which is difficult to achieve in the soilless cultivation of facilities based on ion concentration. Provide theoretical basis and technical support for dynamic regulation. The method is simple, easy to implement, and has high accuracy. It can be used in the development of a nutrient solution regulation system, so as to meet the needs of intelligent matching between the established EC and pH of the nutrient solution and each ion concentration and the automatic control of formula adjustment for different crops at different growth stages.

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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Patent Type & Authority Patents(China)
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