CN102550381B - Method for promoting plant growth - Google Patents
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- CN102550381B CN102550381B CN2012100333180A CN201210033318A CN102550381B CN 102550381 B CN102550381 B CN 102550381B CN 2012100333180 A CN2012100333180 A CN 2012100333180A CN 201210033318 A CN201210033318 A CN 201210033318A CN 102550381 B CN102550381 B CN 102550381B
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Abstract
The invention relates to a method for promoting plant growth, which comprises the following steps: preparing a growth solution by sequentially adding ethylene glycol bis(2-aminoethyl) tetraacetic acid (EGTA) and a nonionic surfactant into a nutrient solution; planting plant seeds in the growth solution; and performing supplemental lighting for the plant seeds. The method of the invention has an obvious promotion effect, so that the rate of plant growth is fast; and materials used to prepare the nutrient solution are less in dosage and low in cost.
Description
Technical field
The invention belongs to the agricultural modernization field, relate to the Artificial Control to plant growth, relate in particular to a kind of method of Promoting plant growth speed.
Background technology
Cultivation technique without soil is as a kind of comparatively advanced planting technology, the applicating history of existing many decades, particularly in the last thirty years, the technology of controlling the advanced persons such as industry along with material industry, automation develops rapidly, and on the further investigation on plant growth impact etc. of plant growth rule, environmental factor, make cultivation technique without soil be tending towards ripe.
Soilless culture can create as a kind of Artificial Control to plant growth the environment that is more suitable for plant growth, increases the uniformity of Phytoextraction fertilizer, and with this Promoting plant growth; This method can improve the availability in soil simultaneously, increases the unit are plantation amount of plant; But this method still has certain limitation, and is little to the facilitation of plant growth rate.
The method of present another kind of Promoting plant growth is to carry out light filling to plant, be that 200810020855.5 Chinese patents disclose a kind of plant growth lamp as number of patent application, disclose and a kind ofly satisfied photosynthesis of plant to the plant growth lamp of Requirement of Spectrum, and mention and adopt artificial light filling to the facilitation of plant growth, but this plant growth lamp is only considered plant to the roughly demand of spectrum, and is still limited to the facilitation of plant growth.
Summary of the invention
The present invention provides a kind of promotion method that can more effectively accelerate plant growth for solving the prior art problem.
Technical scheme of the present invention is: a kind of method of Promoting plant growth comprises the following steps:
A) successively add EGTA and nonionic surface active agent in nutrient solution, be mixed with growth-promoting media;
B) plant plant seed in growth-promoting media;
C) plant seed is carried out light filling, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 400nm ~ 480nm, and intensity of illumination is 0.8 ~ 2 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out light filling, until plant is completed vegetative period, the wave-length coverage of light filling is 600nm ~ 680nm, and intensity of illumination is 1 ~ 1.2 times of this Plant Light saturation point.
The growth rate of plant depends on photosynthetic speed to a great extent, and there is certain scope in the demand of Photosynthetic spectrum as shown in Figure 1; And light saturation point refers to the intensity of illumination when intensity of illumination reaches certain and strengthens intensity of illumination when some again and can not promote the photosynthesis of plant; Light compensation point refers to, the intensity of illumination point when the photosynthesis of plant is suitable with respiration; Therefore, intensity of illumination is limited to photosynthetic intensity effect.when carrying out light filling to being in seed in the growth-promoting media that has added EGTA and nonionic surface active agent, when plant is in germination period, the light wavelength scope is 400nm ~ 480nm, intensity of illumination is 0.8 ~ 2 times of this Plant Light compensation point, and be in vegetative period when plant, the light wavelength scope is 600nm ~ 680nm, intensity of illumination is 1 ~ 1.2 times of this Plant Light saturation point, the inventor finds, the phenomenon that moves to left has to a certain degree occured in the relation curve of plant growth rate and auximone, the auximone concentration that is to say low scope also can promote the growth of plant effectively, be that the plant auximone that it synthesizes itself in process of growth is just enough, do not need to use the fertilizer that contains auximone can guarantee that plant grows fast yet, in addition, ectogenic growth hormone may have side effect to plant.Intensity of illumination surpasses lifting slightly again after light saturation point, has the effect that makes the plant growth curve move to left, certainly intensity of illumination is only one of them factor, also have a factor to be plant itself, it needs plant to have surging vitality, supposes that the vitality of this plant is not strong, very likely damages plant when intensity of illumination surpasses light saturation point, therefore, plant of the present invention is cultivated in early stage and also has one's own knack.As everyone knows, the light of photosynthetic process need sufficient intensity, so that the chlorophyll of the photosynthetic reaction centre inside photon and leaf carries out photosynthesis, thereby produce enough energy and come the decomposition water molecule, therefore adopt the artificial light sources of specific wavelength to carry out light filling to the plant in vegetative period, can make plant obtain best growth photoenvironment, and obtain best photosynthetic efficiency, can greatly shorten plant germination time and maturation time.therefore, those skilled in the art when cultivating plant usually at the beginning, plant be in Seedling Stage even seed stage just impose the illumination of capacity, to promote the growth of plant, but, the inventor finds, wherein there is a problem in this, namely because illumination is sufficient, and at this time development of plants is nowhere near perfect, under superior external environmental condition, plant self grows the ability that generates chloroplast and is suppressed, should be more precisely superior external environment exist any inducing action to the reinforcement of the performance of the generation of plant chloroplast and chloroplast, to such an extent as to the plant early growth is fast, late growing stage is partially slow, and being those of ordinary skills, this problem ignores.Under the impelling of this discovery, germination period in technical scheme of the present invention, it is 400nm ~ 480nm that the inventor has selected the light wavelength scope, intensity of illumination is so scope of 0.8 ~ 2 times of this Plant Light compensation point, for be exactly to make the slow chloroplast that generates q.s of growth in plant early stage self, think that the Fast Growth in later stage lays the first stone.In vegetative period, relative germination period is the later stage namely, strengthens intensity of illumination, accelerates the growth of plant, completes the plant cultivation faster and betterly.Comprehensively, the present invention is by screening suitable wave band, impose again faint illumination, exchange the raising of plant self vitality for the cost of loss plant early growth speed, for plant later stage Fast Growth lays the first stone, then impose again in the later stage illumination that slightly surpasses the light saturation intensity, make the growth curve of plant move to left, to promote the growth of plant, finally reach the purpose that strong plant itself promotes quick growth of plant.EGTA is the ethylene glycol diethyl ether ethylenediamine tetraacetic acid (EDTA).
As preferably, described nutrient solution is the buffer system that includes P, Ca, K and N element, and the pH value is 6 ~ 7.
EGTA and nonionic surface active agent can be stablized each composition ion in nutrient solution, after a part of Ca element complexing in EGTA and nutrient solution forms complexing core, set up one and half solution systems centered by this complexing core, promote the stable of growth-promoting media.
As preferably, in step a, added after EGTA the interval 20 ~ 60 minutes, then add nonionic surface active agent.
As preferably, in described nutrient solution, the mass percent of the EGTA that adds is 0.02 ~ 0.1%, and the mass percent of the nonionic surface active agent that adds is 0.01 ~ 0.05%.
As preferably, described nonionic surface active agent is polyoxyethylene or APEO.
Polyoxyethylene or APEO can increase the osmosis of growth-promoting media as surfactant, accelerate the speed of plant absorbing ion, Promoting plant growth; Simultaneously, polyoxyethylene can make the ion in solution have certain charged repellency, makes to realize between different ions evenly separating, further the various ions in stabilizing solution.
As preferably, the pH value of described growth-promoting media is 5.8 ~ 6.8.
Plant is in the speed of growing in the environment of PH meta-acid higher than the environment of PH meta-alkali.
As preferably, in described nutrient solution, the P constituent content is that 0.32 ~ 0.56%, Ca constituent content is that the content of 1.87 ~ 3.02%, K element is that the content of 0.56 ~ 1.98%, N element is 0.86 ~ 1.78%.
As preferably, in described nutrient solution, the P constituent content is that 0.42 ~ 0.52%, Ca constituent content is that the content of 2.00 ~ 2.50%, K element is that the content of 0.80 ~ 1.60%, N element is 1.0 ~ 1.42%.
This constituent content is mass content.The too low limiting plant growth of nutrient solution ion concentration; The plant burn that easily causes as too high in ion concentration.
As preferably, in step c, the time of light filling is 12 ~ 16 hours every days; In steps d, the time of light filling is 16 ~ 19 hours every days.
Also there is respiration in this in the photosynthetic while plant, as the light filling overlong time, may suppress the respiration of plant itself, and Promoting plant growth is had the opposite effect; And the respiration that plant need to carry out in the development stage is more with respect to vegetative period and fruiting period, so light filling time development stage is less than the light filling time in vegetative period.
As preferably, in step c, the wave-length coverage of light filling is 430nm ~ 440nm; In steps d, the wave-length coverage of light filling is 650nm ~ 670nm.
Carry out absorption spectrum test confirmation through extract plant leaf blade chlorophyll in ether solution, chlorophyllous absworption peak is 432nm and 660nm, therefore, the artificial light filling of best results, need select spectrum to be positioned near the monochromatic source of these two wavelength, and the light plant absorbing of other wavelength is few, and the light source availability is low.
In sum, the present invention has the following advantages:
1, facilitation effect is obvious, and plant growth rate is fast;
2, the compounding materials are few, and cost is low.
Description of drawings
Fig. 1 is the photosynthesis spectrogram;
Fig. 2 is the embodiment of the present invention one growth curve contrast figure.
Embodiment
The invention will be further described with embodiment for the below.
Embodiment one:
A kind of method of Promoting plant growth comprises the following steps:
A) get the nutrient solution that portion contains 0.32%P element, 1.87%Ca element, 0.56%K element and 0.86%N element; First add 0.02% EGTA in nutrient solution, place and add 0.01% polyoxyethylene as nonionic surface active agent after 20 minutes, be mixed with growth-promoting media, the pH value of growth-promoting media is adjusted to 6;
B) plant seed in growth-promoting media;
C) seed is carried out 12 hours light fillings every day, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 400nm, and intensity of illumination is 0.8 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out 16 hours light fillings every day, until plant is completed vegetative period and fruiting period, the wave-length coverage of light filling is 600nm, and intensity of illumination is 1 times of this Plant Light saturation point.
Wherein, seed stage is the stage that plant seed not yet germinates, and germination period is that plant seed begins to germinate until be grown to the stage of seedling, vegetative period be plant seedlings to the ripe stage, fruiting period i.e. ripe plant begins to bloom stage to fruit maturation.
The plant lamp that adopts during light filling, comprise housing, and be arranged at light source in this housing, light source is the White LED particle, and the place ahead of light source is provided with the light-passing board of being made by transparent material, is provided with collector lens between light source and light-passing board, the light that collector lens sends the LED particle focuses in the scope of light-passing board, light-passing board is fixedly connected with housing by magnet, and magnet comprises the upper magnet that is arranged on housing, and is arranged at the lower magnet on light-passing board; The lower surface of upper magnet and the upper surface of lower magnet are in contact with one another, and wherein, the lower surface of upper magnet is the S utmost point, and the upper surface of upper magnet is the N utmost point.
When plant was in seed stage, light-passing board adopted blue light-passing board, and light-passing board transmission light wavelength is 400nm, and continuous light filling is carried out in the illumination of 0.8 times take intensity as this Plant Light compensation point during every days 7 point ~ 19, and all the other times completely cut off all light sources of plant; When plant germination is completed, in the time of will entering vegetative period, change blue light-passing board into red light-passing board, light-passing board transmission light wavelength is 600nm, continuous light filling is carried out in the illumination of 1 times take intensity as this Plant Light saturation point during every days 5 point ~ 21, all the other times completely cut off all light sources of plant, until plant is completed vegetative period and fruiting period.
Take pumpkin as example, one group of Pumpkin Seed adopts the inventive method plantation, and another group Pumpkin Seed is put into the surroundings plantation; compare; through actual test, after the week, the Pumpkin Seed germinating growth speed of the inventive method plantation is than the contrast groups speed in surroundings fast approximately 50%.
Equally take tomato as example; one group of tomato seeds adopts the inventive method plantation; another group tomato seeds is put into the surroundings plantation; compare; contrast through 50 days; growth curve adopts plant that the present invention program cultivates to increase approximately 40% than the growth rate of growing plants in surroundings as shown in Figure 2, and the cycle fructiferous also exceeds approximately 36% than the contrast groups of growing in surroundings.
Embodiment two:
A kind of method of Promoting plant growth comprises the following steps:
A) get the nutrient solution that portion contains 0.56%P element, 3.02%Ca element, 0.56%K element and 1.78%N element; First add 0.1% EGTA in nutrient solution, place and add 0.05% polyoxyethylene as nonionic surface active agent after 60 minutes, be mixed with growth-promoting media, the pH value of growth-promoting media is adjusted to 7;
B) plant seed in growth-promoting media;
C) seed is carried out 16 hours light fillings every day, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 480nm, and intensity of illumination is 2 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out 19 hours light fillings every day, until plant is completed vegetative period and fruiting period, the wave-length coverage of light filling is 680nm, and intensity of illumination is 1.2 times of this Plant Light saturation point.
The plant lamp that adopts during light filling, comprise housing, and be arranged at light source in this housing, light source is the White LED particle, and the place ahead of light source is provided with the light-passing board of being made by transparent material, is provided with collector lens between light source and light-passing board, the light that collector lens sends the LED particle focuses in the scope of light-passing board, light-passing board is fixedly connected with housing by magnet, and magnet comprises the upper magnet that is arranged on housing, and is arranged at the lower magnet on light-passing board; The lower surface of upper magnet and the upper surface of lower magnet are in contact with one another, and wherein, the lower surface of upper magnet is the N utmost point, and the upper surface of upper magnet is the S utmost point.
When plant was in seed stage, light-passing board adopted blue light-passing board, and light-passing board transmission light wavelength is 480nm, and continuous light filling is carried out in the illumination of 2 times take intensity as this Plant Light compensation point during every days 5 point ~ 21, and all the other times completely cut off all light sources of plant; When plant germination is completed, in the time of will entering vegetative period, change blue light-passing board into red light-passing board, light-passing board transmission light wavelength is 680nm, continuous light filling is carried out in the illumination of 1.2 times take intensity as this Plant Light saturation point during every days 4 point ~ 23, all the other times completely cut off all light sources of plant, until plant is completed vegetative period and fruiting period.
Take pumpkin as example, one group of Pumpkin Seed adopts the inventive method plantation, and another group Pumpkin Seed is put into the surroundings plantation; compare; through actual test, after the week, the Pumpkin Seed germinating growth speed of the inventive method plantation is than the contrast groups speed in surroundings fast approximately 48%.
Equally take tomato as example; one group of tomato seeds adopts the inventive method plantation; another group tomato seeds is put into the surroundings plantation; compare; contrast through 50 days; adopt plant that the present invention program cultivates to increase approximately 42% than the growth rate of growing plants in surroundings, the cycle fructiferous also exceeds approximately 35% than the contrast groups of growing in surroundings.
Embodiment three:
A kind of method of Promoting plant growth comprises the following steps:
A) get the nutrient solution that portion contains 0.48%P element, 2.43%Ca element, 1.32%K element and 1.26%N element; First add 0.08% EGTA in nutrient solution, place and add 0.03% polyoxyethylene as nonionic surface active agent after 30 minutes, be mixed with growth-promoting media, the pH value of growth-promoting media is adjusted to 6.3;
B) plant seed in growth-promoting media;
C) seed is carried out 15 hours light fillings every day, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 450nm, and intensity of illumination is 1 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out 18 hours light fillings every day, until plant is completed vegetative period and fruiting period, the wave-length coverage of light filling is 660nm, and intensity of illumination is 1.1 times of this Plant Light saturation point.
The plant lamp that adopts during light filling, comprise housing, and be arranged at light source in this housing, light source is the White LED particle, and the place ahead of light source is provided with the light-passing board of being made by transparent material, is provided with collector lens between light source and light-passing board, the light that collector lens sends the LED particle focuses in the scope of light-passing board 2, light-passing board is fixedly connected with housing by magnet, and magnet comprises the upper magnet that is arranged on housing, and is arranged at the lower magnet on light-passing board; The lower surface of upper magnet and the upper surface of lower magnet are in contact with one another, and wherein, the lower surface of upper magnet is the S utmost point, and the upper surface of upper magnet is the N utmost point.
When plant was in seed stage, light-passing board adopted blue light-passing board, and light-passing board transmission light wavelength is 450nm, and continuous light filling is carried out in the illumination of 1 times take intensity as this Plant Light compensation point during every days 5 point ~ 20, and all the other times completely cut off all light sources of plant; When plant germination is completed, in the time of will entering vegetative period, change blue light-passing board into red light-passing board, light-passing board transmission light wavelength is 660nm, continuous light filling is carried out in the illumination of 1.1 times take intensity as this Plant Light saturation point during every days 4 point ~ 22, all the other times completely cut off all light sources of plant, until plant is completed vegetative period and fruiting period.
Take pumpkin as example, one group of Pumpkin Seed adopts the inventive method plantation, and another group Pumpkin Seed is put into the surroundings plantation; compare; through actual test, after the week, the Pumpkin Seed germinating growth speed of the inventive method plantation is than the contrast groups speed in surroundings fast approximately 53%.
Equally take tomato as example; one group of tomato seeds adopts the inventive method plantation; another group tomato seeds is put into the surroundings plantation; compare; contrast through 50 days; adopt plant that the present invention program cultivates to increase approximately 44% than the growth rate of growing plants in surroundings, the cycle fructiferous also exceeds approximately 40% than the contrast groups of growing in surroundings.
Embodiment four:
A kind of method of Promoting plant growth comprises the following steps:
A) get the nutrient solution that portion contains 0.42%P element, 2.00%Ca element, 0.80%K element and 1.0%N element; First add 0.08% EGTA in nutrient solution, place and add 0.03% polyoxyethylene as nonionic surface active agent after 30 minutes, be mixed with growth-promoting media, the pH value of growth-promoting media is adjusted to 6.3;
B) plant seed in growth-promoting media;
C) seed is carried out 15 hours light fillings every day, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 450nm, and intensity of illumination is 1 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out 18 hours light fillings every day, until plant is completed vegetative period and fruiting period, the wave-length coverage of light filling is 660nm, and intensity of illumination is 1.1 times of this Plant Light saturation point.
The plant lamp that adopts during light filling, comprise housing, and be arranged at light source in this housing, light source is the White LED particle, and the place ahead of light source is provided with the light-passing board of being made by transparent material, is provided with collector lens between light source and light-passing board, the light that collector lens sends the LED particle focuses in the scope of light-passing board 2, light-passing board is fixedly connected with housing by magnet, and magnet comprises the upper magnet that is arranged on housing, and is arranged at the lower magnet on light-passing board; The lower surface of upper magnet and the upper surface of lower magnet are in contact with one another, and wherein, the lower surface of upper magnet is the S utmost point, and the upper surface of upper magnet is the N utmost point.
When plant was in seed stage, light-passing board adopted blue light-passing board, and light-passing board transmission light wavelength is 450nm, and continuous light filling is carried out in the illumination of 1 times take intensity as this Plant Light compensation point during every days 5 point ~ 20, and all the other times completely cut off all light sources of plant; When plant germination is completed, in the time of will entering vegetative period, change blue light-passing board into red light-passing board, light-passing board transmission light wavelength is 660nm, continuous light filling is carried out in the illumination of 1.1 times take intensity as this Plant Light saturation point during every days 4 point ~ 22, all the other times completely cut off all light sources of plant, until plant is completed vegetative period and fruiting period.
Take pumpkin as example, one group of Pumpkin Seed adopts the inventive method plantation, and another group Pumpkin Seed is put into the surroundings plantation; compare; through actual test, after the week, the Pumpkin Seed germinating growth speed of the inventive method plantation is than the contrast groups speed in surroundings fast approximately 51%.
Equally take tomato as example; one group of tomato seeds adopts the inventive method plantation; another group tomato seeds is put into the surroundings plantation; compare; contrast through 50 days; adopt plant that the present invention program cultivates to increase approximately 42% than the growth rate of growing plants in surroundings, the cycle fructiferous also exceeds approximately 38% than the contrast groups of growing in surroundings.
Embodiment five:
A kind of method of Promoting plant growth comprises the following steps:
A) get the nutrient solution that portion contains 0.56%P element, 2.50%Ca element, 160%K element and 1.42%N element; First add 0.08% EGTA in nutrient solution, place and add 0.03% polyoxyethylene as nonionic surface active agent after 30 minutes, be mixed with growth-promoting media, the pH value of growth-promoting media is adjusted to 6.3;
B) plant seed in growth-promoting media;
C) seed is carried out 15 hours light fillings every day, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 450nm, and intensity of illumination is 1 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out 18 hours light fillings every day, until plant is completed vegetative period and fruiting period, the wave-length coverage of light filling is 660nm, and intensity of illumination is 1.1 times of this Plant Light saturation point.
The plant lamp that adopts during light filling, comprise housing, and be arranged at light source in this housing, light source is the White LED particle, and the place ahead of light source is provided with the light-passing board of being made by transparent material, is provided with collector lens between light source and light-passing board, the light that collector lens sends the LED particle focuses in the scope of light-passing board 2, light-passing board is fixedly connected with housing by magnet, and magnet comprises the upper magnet that is arranged on housing, and is arranged at the lower magnet on light-passing board; The lower surface of upper magnet and the upper surface of lower magnet are in contact with one another, and wherein, the lower surface of upper magnet is the S utmost point, and the upper surface of upper magnet is the N utmost point.
When plant was in seed stage, light-passing board adopted blue light-passing board, and light-passing board transmission light wavelength is 450nm, and continuous light filling is carried out in the illumination of 1 times take intensity as this Plant Light compensation point during every days 5 point ~ 20, and all the other times completely cut off all light sources of plant; When plant germination is completed, in the time of will entering vegetative period, change blue light-passing board into red light-passing board, light-passing board transmission light wavelength is 660nm, continuous light filling is carried out in the illumination of 1.1 times take intensity as this Plant Light saturation point during every days 4 point ~ 22, all the other times completely cut off all light sources of plant, until plant is completed vegetative period and fruiting period.
Take pumpkin as example, one group of Pumpkin Seed adopts the inventive method plantation, and another group Pumpkin Seed is put into the surroundings plantation; compare; through actual test, after the week, the Pumpkin Seed germinating growth speed of the inventive method plantation is than the contrast groups speed in surroundings fast approximately 52%.
Equally take tomato as example; one group of tomato seeds adopts the inventive method plantation; another group tomato seeds is put into the surroundings plantation; compare; contrast through 50 days; growth curve adopts plant that the present invention program cultivates to increase approximately 41% than the growth rate of growing plants in surroundings as shown in Figure 2, and the cycle fructiferous also exceeds approximately 38% than the contrast groups of growing in surroundings.
Claims (10)
1. the method for a Promoting plant growth, is characterized in that, comprises the following steps:
A) successively add EGTA and nonionic surface active agent in nutrient solution, be mixed with growth-promoting media;
B) plant plant seed in growth-promoting media;
C) plant seed is carried out light filling, until seed is completed germination period, be grown to the Seedling Stage plant, the wave-length coverage of light filling is 400nm ~ 480nm, and intensity of illumination is 0.8 ~ 2 times of this Plant Light compensation point;
D) the Seedling Stage plant is carried out light filling, until plant is completed vegetative period, the wave-length coverage of light filling is 600nm ~ 680nm, and intensity of illumination is 1 ~ 1.2 times of this Plant Light saturation point.
2. the method for Promoting plant growth according to claim 1, it is characterized in that: described nutrient solution is the buffer system that includes P, Ca, K and N element, and the pH value is 6 ~ 7.
3. the method for described Promoting plant growth according to claim 1 and 2 is characterized in that: in step a, added after EGTA the interval 20 ~ 60 minutes, then add nonionic surface active agent.
4. the method for Promoting plant growth according to claim 3, it is characterized in that: in described nutrient solution, the EGTA's that adds is 0.02 ~ 0.1%, and the mass percent of the nonionic surface active agent that adds is 0.01 ~ 0.05%.
5. the method for Promoting plant growth according to claim 4, it is characterized in that: described nonionic surface active agent is polyoxyethylene or APEO.
6. the method for described Promoting plant growth according to claim 1 and 2, it is characterized in that: the pH value of described growth-promoting media is 5.8 ~ 6.8.
7. the method for Promoting plant growth according to claim 6 is characterized in that: in described nutrient solution, the P constituent content is that 0.32 ~ 0.56%, Ca constituent content is that the content of 1.87 ~ 3.02%, K element is that the content of 0.56 ~ 1.98%, N element is 0.86 ~ 1.78%.
8. the method for Promoting plant growth according to claim 6 is characterized in that: in described nutrient solution, the P constituent content is that 0.42 ~ 0.52%, Ca constituent content is that the content of 2.00 ~ 2.50%, K element is that the content of 0.80 ~ 1.60%, N element is 1.0 ~ 1.42%.
9. the method for Promoting plant growth according to claim 1, it is characterized in that: in step c, the time of light filling is 12 ~ 16 hours every days; In steps d, the time of light filling is 16 ~ 19 hours every days.
10. the method for according to claim 1 and 2 or 9 described Promoting plant growths, it is characterized in that: in step c, the wave-length coverage of light filling is 440nm ~ 450nm; In steps d, the wave-length coverage of light filling is 630nm ~ 660nm.
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