A method of using seawater to grow vegetables

A seawater and vegetable technology, applied in the field of seawater utilization, can solve problems such as inability to supply fresh vegetables

Inactive Publication Date: 2020-10-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention provides a method for growing vegetables by utilizing seawater, aiming at the situation that fresh vegetables cannot be supplied in coastal areas, sea islands or under the environment or conditions lacking fresh water for a long time on the voyage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Low-salt seawater nutrient solution for planting lettuce: Take 1m of seawater 3 , adding NaOH to adjust the pH to 9.3 and bubbling CO 2 Until no precipitation occurs, the supernatant is washed with HNO 3 After its pH is adjusted to 6.5, it is subjected to two-stage nanofiltration to control the seawater rejection rate to 40%, and the interception of Mg in seawater 2+ The concentration of 25.5mg / L and H 3 BO 3 The concentration of plant nutrients such as 0.1mg / L, and then add Ca(NO 3 ) 2 , NH 4 NO 3 、KNO 3 、KH 2 PO 4 , FeEDTA and (NH 4 ) 6 Mo 7 o 24 , to prepare a low-salt seawater nutrient solution, wherein the concentrations of the above-mentioned 6 kinds of salts are 450mg / L, 150mg / L, 100mg / L, 120mg / L, 0.02mg / L and 0.002mg / L respectively.

[0034] Among them, the conditions of the second-stage nanofiltration device (NF-2012) are: temperature 20-40°C, operating pressure 0.4-1.5MPa, influent flow 10-30L / h.

[0035] The low-salt seawater nutrient solution ...

Embodiment 2

[0038] Plant water spinach with low-salt seawater nutrient solution: the preparation process of low-salt seawater is the same as that of Example 1, except that Ca(NO 3 ) 4 .H 2 O, NH 4 NO 3 , KNO 3 , KH 2 PO 4 , FeEDTA, (NH 4 ) 6 Mo 7 o 24 , their concentrations after addition are 450mg / L, 130mg / L, 100mg / L, 140mg / L, 0.015mg / L, 0.0015mg / L, among them, H 3 BO 3 and Mg 2+ The concentrations are 0.15mg / L and 35mg / L respectively.

[0039] The low-salt seawater prepared in this example was used as the nutrient solution, and water spinach was planted with reference to the soilless cultivation mode in Example 1. During one month, the water spinach grew vigorously, growing from an average of 5.3 cm to an average height of 26.4 cm, and there were no other defects. state.

Embodiment 3

[0041] Salt-free seawater nutrient solution planting lettuce: further processing the permeated liquid after the second-stage nanofiltration device in Example 1, adding the precipitate obtained by filtering in Example 1 (the mass volume concentration added by the precipitate is 780mg / L), and nitric acid was added to dissolve the precipitate, the pH value was adjusted to 6.5, and then the reverse osmosis device was used to desalinate, and finally the permeate was taken, and NH was added to it respectively 4 NO 3 , (NH 4 )H 2 PO 4 、KNO 3 , FeEDTA, (NH 4 ) 6 Mo 7 o 24 and H 3 BO 3 , and their concentrations after addition are 150mg / L, 110mg / L, 400mg / L, 0.01mg / L, 0.002mg / L and 0.2mg / L, respectively, to obtain salt-free seawater nutrient solution, wherein Ca 2+ and Mg 2+ The concentrations were 450mg / L and 260mg / L respectively.

[0042] In the above process, the conditions of the reverse osmosis device are: temperature 20-40°C, operating pressure 4-6.5MPa, influent flow...

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PUM

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Abstract

The invention discloses a method for utilizing seawater to plant vegetables. The method comprises the steps that S1, CO2 is blown in seawater to generate sediments, and the pH value of sea water is controlled to be 9-11; S2, the sediments are filtered, and a two-stage nanofiltration device is adopted for treating the sediments to obtain trapped fluid and permeation liquid; S3, the trapped fluid issupplemented with other nutrient elements to obtain low-salt seawater nutrient liquid; S4, the sediments in the step S2 is added into the permeation liquid, after nitric acid is added, and the sediments are dissolved, a reverse osmosis device is utilized for treating to obtain penetrating fluid, and the penetrating fluid is supplemented with other nutrient elements to obtain salt-free seawater nutrient liquid; S5, the low-salt seawater nutrient liquid or the salt-free seawater nutrient liquid is taken for planting vegetables. By utilizing multiple seawater treating technologies, the mutual cooperation of the technologies is utilized for selectively removing NaCl, a suitable amount of mineral nutrition required by the growth of the vegetables is kept, the limitation of few types of salt-tolerance vegetables is broken through, mineral elements in seawater are fully utilized, the dual utilization of water resources and nutrition is achieved, and the problems of vegetable planting and supplying on sea islands and other lands and in the areas short of fresh water are solved.

Description

technical field [0001] The invention relates to the technical field of seawater utilization, and more specifically, relates to a method for growing vegetables by using seawater and the nutrient components therein. Background technique [0002] The 21st century is an era when human beings have fully entered the development and utilization of marine resources. Rational development and utilization of the ocean has become an important way to solve the shortage of resources and the deterioration of the environment due to population growth. At present, all coastal countries in the world have included marine development in their national development strategies. Among them, seawater agriculture plays an important role in marine development. Seawater irrigation agriculture not only replaces precious fresh water with huge amounts of idle seawater, but also provides unique products, generating huge ecological benefits. Scientific experiments have confirmed that the development of seaw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G31/00C05G1/00C05G5/23
CPCA01G31/00C05B7/00C05G5/23C05C1/00C05C3/00C05C5/02C05C5/04C05D9/00C05D9/02
Inventor 熊亚孙竟翔刘晓盛田双红
Owner SUN YAT SEN UNIV
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