Method for cultivating onion seedling

Abstract

A method for cultivating onion seedling is used to cultivate less spicy edible bulbs. The method comprises: seeding an onion to obtain an onion seedling. When cultivating the onion, a light is used to irradiate the onion with a daily light integral (DLI) of from

Description

Technical Field

[0001] The invention relates to an onion cultivation method, in particular to an onion seedling cultivation method. Prior Art

[0002] Onion (Allium cepa L.) is a biennial herb of the Allium family. The edible part is the bulb, which refers to the enlarged part at the base of the leaf sheath in the late growth stage. Generally speaking, it takes about a year to harvest the bulb. However, during the onion cultivation process, an organic sulfur compound called diallyl disulfide (DADS) is formed in the bulb, giving the bulb a unique spicy taste, which has hindered the development of onion recipes.

[0003] In view of this, there is a real need to provide a method for cultivating onions to cultivate edible bulbs with a less pungent taste. Summary of the invention

[0004] To solve the above problems, the main purpose of the present invention is to provide a method for cultivating onions for cultivating edible bulbs with less pungent taste.

[0005] The onion seedling cultivation method of the present invention may include: sowing an onion seed to obtain an onion seedling, wherein during the cultivation of the onion seed, the onion seed is irradiated with light, and the daily cumulative light amount of the onion seed is 14-17 μmol·m -2d -1.

[0006] In the onion seedling cultivation method of the present invention, the photon flux density of the light is 250-300 μmol m -2 s -1, and the irradiation time is 16 hours / day.

[0007] In the onion seedling cultivation method of the present invention, after the onion seeds are sown, the onion seeds can be cultivated in water before the onion seeds germinate and grow the first leaf.

[0008] In the onion seedling cultivation method of the present invention, after the onion seeds germinate and grow the first leaf and before the onion seedlings are obtained, the onion seeds can be cultivated with an onion anti-lean growth nutrient solution.

[0009] In the onion seedling cultivation method of the present invention, each liter of the onion anti-lean growth nutrient solution may contain: 26.6 mg of nitrate nitrogen, 9 mg of ammonium nitrogen, 23.81 mg of phosphorus, 79.91 mg of potassium, 19.17 mg of calcium, 0.02 mg of sulfur, 0.03 mg of zinc and 0.54 mg of boron.

[0010] Accordingly, by irradiating the onion seeds with light of a specific photon flux density for a specific period of time, the bulbs of the obtained onion seedlings can be made to swell earlier. In addition to accelerating the acquisition of edible bulbs, the shorter the cultivation time, the lower the content of diallyl disulfide in the bulbs, thereby reducing the pungent taste of the bulbs, which is the effect of the present invention. Simple diagram description

[0011] [Figure 1] Photographs of onion seedlings in each group in experiment (A). [Figure 2] Photographs of onion seedlings in each group in Experiment (B). Implementation

[0012] In order to make the above and other purposes, features and advantages of the present invention more clearly understood, the preferred embodiments of the present invention are specifically described below in detail with reference to the accompanying drawings:

[0013] The onion seedling cultivation method of the present invention may include: sowing an onion seed to obtain an onion seedling.

[0014] It is noteworthy that in the onion seedling cultivation method of the present invention, during the process of cultivating the onion seeds, the edible bulbs of the obtained onion seedlings can be rapidly expanded by using a specific light intensity, thereby obtaining onion seedlings containing onion bulbs with less pungent taste.

[0015] In detail, the worker can sow the onion seeds into a plug tray, and then place the plug tray in a step-in growth chamber, so as to intelligently control the environmental parameters such as temperature, carbon dioxide concentration and light required for the germination and growth of the onion seeds by the walk-in growth chamber. During the process of cultivating the onion seeds, the onion seeds can be irradiated with a light, and the daily light integral (DLI) of the onion seeds is 14~17 μmol·m -2d -1. In this embodiment, the environmental parameters of the walk-in growth chamber are set as: average day and night temperature 25 / 22°C, carbon dioxide concentration 800 ppm, light quantity [photosynthetic photon flux density (PPFD)] 250~300 μmol m -2s -1 (16 hours of sunshine and 8 hours of darkness).

[0016] Furthermore, after the onion seeds are sown, until the onion seeds germinate and grow the first leaf (about 14 days), the worker can cultivate the onion seeds with water (conductivity of 0.1 ms‧cm -1).

[0017] Then, the worker can further cultivate the onion seeds with an onion anti-lean growth solution (conductivity of 0.8 ms‧cm -1) after the onion seeds germinate and grow the first leaf until the onion seedlings are obtained (about 31 days). In this embodiment, each liter of the onion anti-lean growth solution can contain: 26.6 mg of nitrate nitrogen (NO 3-N), 9 mg of ammonium nitrogen (NH 4-N), 23.81 mg of phosphorus, 79.91 mg of potassium, 19.17 mg of calcium, 0.02 mg of sulfur, 0.03 mg of zinc and 0.54 mg of boron.

[0018] 45 days after sowing [Days after sowing (DAS) = 45], onion seedlings with early bulb swelling can be harvested.

[0019] In order to confirm that the onion seedling cultivation method of the present invention can indeed be used to obtain onion seedlings with early bulb expansion, the following experiment was conducted:

[0020] Test (A)

[0021] In experiment (A), light with a spectrum of R 26G 46B 28 was used. Except for adjusting the light intensity to 150 µmol m -2s -1, 200 µmol m -2s -1 and 250 µmol m -2s -1, the other environmental parameters (such as average day and night temperature, carbon dioxide concentration, sunshine hours and culture medium) were exactly the same.

[0022] 45 days after sowing, the growth status of onion seedlings in each group was analyzed. The results are shown in Table 1 and Figure 1. In the group with a light intensity of 250 µmol m -2s -1, the bulbs expanded prematurely.

[0023] Table 1 Group Plant height(cm) Fresh weight(g) Dry weight (g) Root length (cm) Number of leaves (n) Stem diameter(mm) 150 39.9±1.7 a 5.70±0.60 b 0.40±0.05 b 8.9±1.1 b 3.9±0.2a 6.25±0.85 c 200 28.4±2.5 b 7.12±0.88 a 0.62±0.07a 10.8±2.4 a 4.0±0.3a 7.20±0.85 b 250 25.8±2.5 b 7.54±0.71 a 0.64±0.27 a 9.9±3.0 b 3.1±0.6 b 18.00±1.00a

[0024] Test (B)

[0025] In experiment (B), different spectra of light were used to carry out the experiment, that is, four different spectra of light, R 26G 46B 28, R 43G 34B 23, R 50B 50 and R 54G 9B 22FR 15, were used to irradiate the onion seedlings. The light amounts were 132.7 µmol m -2s -1, 155.6 µmol m -2s -1, 189.4 µmol m -2s -1 and 285.3 µmol m -2s -1 respectively. The other environmental parameters (such as average day and night temperature, carbon dioxide concentration, sunshine time and culture medium) were exactly the same.

[0026] 45 days after sowing, the growth status of onion seedlings in each group was analyzed. The results are shown in Table 2 and Figure 2. In the group with a light intensity of 285.3 µmol m -2s -1, the bulbs expanded prematurely.

[0027] Table 2 Group Plant height(cm) Fresh weight(g) Dry weight (g) Root length (cm) Number of leaves (n) Stem diameter(mm) R 26G 46B 28 32.1±2.8 ab 2.68±0.66 c 0.26±0.06 b 8.7±2.5 b 3.2±0.4 b 7.70±1.72 b R 43G 34B 23 32.9±1.7 a 3.70±0.60 b 0.30±0.05 b 9.7±1.1 b 4.1±0.3a 6.25±0.85 c R 50B 50 31.4±2.5 b 4.12±0.88 a 0.32±0.07 b 12.8±2.4 a 4.0±0.4a 7.20±0.85 b R 54G 9B 22FR 15 19.8±2.5 c 3.54±0.71 b 0.64±0.27 a 9.5±3.0 b 1.6±0.6 c 14.00±1.00a

[0028] In summary, by irradiating the onion seeds with light of a specific photon flux density for a specific period of time, the bulbs of the obtained onion seedlings can be made to swell early. In addition to accelerating the acquisition of edible bulbs, due to the shorter cultivation time, the accumulated amount of diallyl disulfide in the bulbs is lower than that of onions whose bulbs do not swell early (normal onions), thereby reducing the pungent taste of the bulbs, which is the effect of the present invention.

[0029] Although the present invention has been disclosed using the above-mentioned preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art may make various changes and modifications to the above-mentioned embodiments without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

[0030] none

Claims

1. A method for growing onion seedlings, comprising: sowing an onion seed to obtain an onion seedling, wherein: During the cultivation of the onion seeds, the onion seeds are irradiated with light, and the daily accumulated light amount of the onion seeds is 14 to 17 μmol·m -2 d -1 .

2. A method for growing onion seedlings as claimed in claim 1, wherein: The photon flux density of the light is 250 to 300 μmol m -2 s -1 and the irradiation time is 16 hours per day.

3. A method for growing onion seedlings as claimed in claim 1, wherein: After the onion seeds are sown, the onion seeds are cultivated in water until the onion seeds germinate and grow the first leaf.

4. A method for growing onion seedlings as claimed in claim 2, wherein: After the onion seeds germinate and grow the first true leaf, and before the onion seedlings are obtained, the onion seeds are cultivated in an onion anti-lean growth nutrient solution.

5. The method for growing onion seedlings as claimed in claim 3, wherein: Each liter of the onion anti-lean growth solution contains: 26.6 mg of nitrate nitrogen, 9 mg of ammonium nitrogen, 23.81 mg of phosphorus, 79.91 mg of potassium, 19.17 mg of calcium, 0.02 mg of sulfur, 0.03 mg of zinc and 0.54 mg of boron.

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