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Method of reducing nitrate content in soilless-cultivated vegetable

A technology for nitrate content and soilless cultivation, applied in the field of reducing nitrate content in soilless cultivation vegetables, can solve the problems of failing to reach the expected reduction target, unstable treatment effect, poor treatment effect and the like, and achieve cost reduction. and manpower, shorter processing time, and increased efficiency

Inactive Publication Date: 2010-10-06
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

The above method only replaces nitrate from the storage pool (vacuole) into the assimilation pool (cytoplasm), and cannot control the assimilation and utilization of nitrate from the photosynthetic level. Poor, not reaching the expected reduction target
Therefore, the above method only starts from a single factor, and the processing effect is unstable and uncontrollable

Method used

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  • Method of reducing nitrate content in soilless-cultivated vegetable
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  • Method of reducing nitrate content in soilless-cultivated vegetable

Examples

Experimental program
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Effect test

Embodiment 1

[0016] 1.1. Test materials, test design:

[0017] Seedling raising: put vermiculite in the seedling raising tray, sow Italian lettuce seeds (lettuce resistant to bolting all year round), watering and raising seedlings. After emergence, water the nutrient solution to promote growth. Transplanting was carried out after the seedlings grew to 35 days. The lettuce plants are transplanted to a small soilless cultivation bed to continue cultivation, and the whole nutrient solution is used for cultivation. The small-sized cultivation bed has a volume of 21 liters and is ventilated with an Atman EP-9000 air pump (Chuangxing Electric Co., Ltd.). After 21 days of cultivation, it was transplanted into the experimental system for testing. The length, width, and height of the test pot were 30 cm x 20 cm x 12 cm, and the volume was 7 liters. The experiment was transplanted and cultivated on April 24, 2009. Four seedlings were grown in each tray, treated for 3 days, and the light time was ...

Embodiment 2

[0025] 2.1. Test materials and test design:

[0026] Two light intensities were set up in the experiment: high light intensity (120-800μmol·m -2 ·s -1 ) and low light intensity (shading, the light is reduced by about 46%, and the light intensity range is 60-400μmol·m -2 ·s -1 ); Each light treatment is divided into 4 sub-treatments: treatment 1, full nutrient solution (containing 10mmol / L nitrate nitrogen); treatment 2, potassium chloride (0.1mmol / L) solution; treatment 3, sodium chloride ( 10mmol / L) solution and treatment 4, potassium sulfate (0.75mmol / L) solution; the light time is more than 10 hours per day.

[0027] Full nutrient solution formula: 5.0mmol·L -1 Ca(NO 3 ) 2 ;0.75mmol·L -1 K 2 SO 4 ;0.5mmol·L -1 K H 2 PO 4 ;0.1mmol·L -1 KCl; 0.65mmol L -1 MgSO 4 ;1.0×10 -3 mmol·L -1 h 3 BO 3 ;1.0×10 -3 mmol·L -1 MnSO 4 ;1.0×10 -4 mmol·L -1 CuSO 4 ;5.0×10 -6 mmol·L -1 (NH 4 ) 6 m O7 o 24 ;1.0×10 -3 mmol·L -1 ZnSO 4 ;0.1mmol·L -1 EDTA-Fe(FeSO ...

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Abstract

The invention discloses a method of reducing nitrate contents in soilless-cultivated vegetables, which comprises the following steps: supplying osmo-conditioning ionic treating solution instead of original cultural nutrient solution 2-5 days before harvest of the vegetables, making the light intensity reach above 120 mumol . m<-2> . s<-1> through natural lighting and artificial lighting supplement, and ensuring that the lighting duration is 6-20 hours per day. The method can reduce the nitrate content in vegetables stably, controllably and significantly to produce high-quality vegetables with low nitrate contents. Compared with the existing treatment method, the method has the advantages of short treatment time, no pollution, no yield reduction, complete reduction of nitrate contents in leaves and petioles, conservation of nutrient resources and the like, and can be widely applied in the mode of soilless-cultivation of vegetables and the vegetable production of plant factories.

Description

technical field [0001] The invention relates to the vegetable soilless cultivation technique, in particular to a method for reducing the nitrate content in the soilless vegetable in a short period of time. Background technique [0002] Facility cultivation is an important way to produce off-season vegetables in the north, and plays a leading role in meeting the vegetable needs of urban and rural residents in winter and spring. The area of ​​protected vegetables in my country has reached more than 3 million hectares, ranking first in the world. However, obstacles to continuous cropping in protected soil cultivation, negative effects on resources and the environment are becoming more and more serious, and vegetable nitrate and pesticides exceed the standard more seriously. Vegetables, especially leafy vegetables, are nitrogen-loving crops with a large amount of nitrogen absorption, and nitrate in the body is easy to accumulate in vegetables, and the content is often as high a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G31/00
CPCY02P60/21
Inventor 刘文科杨其长
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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