Method for rapidly promoting assimilation of nitrate in vegetables planted by soilless culture technology

A technology of soilless cultivation and nitrate, applied in the field of reducing nitrate content in soilless cultivation vegetables, can solve the problems of not reaching the expected reduction target, unstable treatment effect, poor treatment effect, etc., and achieve cost reduction and Manpower and material resources, improved effect controllability, and shorter processing time

Inactive Publication Date: 2010-09-15
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 pho

Method used

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  • Method for rapidly promoting assimilation of nitrate in vegetables planted by soilless culture technology
  • Method for rapidly promoting assimilation of nitrate in vegetables planted by soilless culture technology
  • Method for rapidly promoting assimilation of nitrate in vegetables planted by soilless culture technology

Examples

Experimental program
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Effect test

Example Embodiment

[0015] Example 1

[0016] 1.1 Test materials and 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, ...

Example Embodiment

[0024] Example 2

[0025] 2.1 Test materials and test design:

[0026] Started on January 21, 2010, sampling and determination were carried out on January 26, 2010, and the processing time was 5 days. The measurement indexes include the nitrate content of each part of the lettuce (new leaf, expanded leaf and petiole), and the chlorophyll content of the new leaf and expanded leaf (SPAD value). The light intensity was measured using a spectrometer.

[0027] 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 50%, and the light intensity range is 60-400μmol·m -2 ·s -1 ); each light treatment was divided into 2 sub-treatments: treatment 1, full nutrient solution (containing 10mmol / L nitrate nitrogen); treatment 2, ammonium molybdate, 5×10 -5 mmol / L; more than 10 hours of light per day.

[0028] Full nutrient solution formula: 5.0mmol·L -1 Ca(NO 3 ) 2 ;0.75mmo...

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Abstract

The invention discloses a method for rapidly promoting the assimilation of nitrate in vegetables planted by the soilless culture technology. The supply of original cultural nutrient solution is stopped 2 to 5 days before the harvest of the vegetables, and molybdate treating solution is supplied; meanwhile, the illumination intensity reaches more than 120 mu mol.m<-2>.s<-1> through natural illumination and artificial supplementary illumination, and the 6 to 20 hours of illumination time in each day is ensured. Under certain light intensity assistance, the molybdate treating solution can stably, controllably and significantly reduce the content of nitrate in the vegetables; and compared with the processing methods in the prior art, the method has the advantages of short processing time, no pollution or yield reduction, capacity of comprehensively lowering the content of notrite in blades and petioles, saving the nutrient resource, and the like; therefore, the method can be widely used in the production of facility vegetables planed in soilless cultivation mode and vegetables in plant factories.

Description

technical field [0001] The invention relates to a vegetable soilless cultivation technology, in particular to a method for rapidly promoting the assimilation of nitrate in the soilless cultivation vegetable so as to reduce the nitrate content in the soilless cultivation 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 the rate of vegetable quality chemical substances (pesticides, nitrates) exceeding the standard is high. Vegetables, especially leafy vegetables, are nitrogen-loving crops w...

Claims

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Application Information

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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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