CN107306782B

CN107306782B - Water planting method of water spinach rich in trace elements

Info

Publication number: CN107306782B
Application number: CN201710699200.4A
Authority: CN
Inventors: 钟宁; 蔡秋亮
Original assignee: Minnan Normal University
Current assignee: Baise Jamen Agricultural Science And Technology LLC
Priority date: 2017-08-16
Filing date: 2017-08-16
Publication date: 2020-06-05
Anticipated expiration: 2037-08-16
Also published as: CN107306782A

Abstract

The invention belongs to the technical field of plant water culture, and particularly relates to a water culture method of water spinach rich in trace elements. The water culture method comprises the following steps: (1) seed soaking: soaking water spinach seeds in a nutrient solution containing trace elements for 4-7 hours, then moving the water spinach seeds into a germination accelerating chamber for accelerating germination for 2-5 days at the temperature of 20-28 ℃ to obtain the water spinach seeds; (2) sowing: sowing the seeds of the water spinach in a hole tray with coconut chaff as a matrix, watering the seeds after sowing, covering a layer of plastic film, and removing the plastic film after the water spinach seedlings come out of the soil; (3) water culture: when the height of the water spinach seedlings reaches 10-15 cm, the water spinach seedlings are transplanted to a water planting device for cultivation, and the nutrient solution containing trace elements is arranged in the water planting device; (4) harvesting: harvesting when the height of the water spinach seedlings reaches 25-35 cm.

Description

Water planting method of water spinach rich in trace elements

Technical Field

The invention belongs to the technical field of plant water culture, and particularly relates to a water culture method of water spinach rich in trace elements.

Background

The human body needs various vitamins and trace elements, such as selenium, germanium and the like, the selenium has the effects of preventing cancer, resisting aging and preventing and treating cardiovascular diseases, and the selenium deficiency causes the immunologic function of the human body and animals to be reduced, thereby being one of the causes of more than 40 diseases, such as diabetes, gastrointestinal diseases, keshan disease and the like. Germanium has special effects in sugar metabolism and lipid metabolism, and germanium supplement can not only reduce cholesterol deposition on aorta, but also remove cholesterol deposited on aorta, and prevent atherosclerosis. The daily selenium and germanium intake of adults in China is far lower than the recommended standard of the nutrition association, so that the normal requirements of human bodies are met by adopting measures for supplementing selenium and germanium. Researches show that great potential safety hazard exists when inorganic selenium and germanium are directly taken in, and if the intake amount is too high, the activity of a deoxyenzyme system in a body is influenced, and the normal metabolism of cells is also hindered. Selenium and germanium are absorbed by crops in the form of fertilizers, and then are supplemented by vegetable foods in a dietary therapy mode, so that the selenium and germanium can be economically and healthily supplemented. At present, people have made a large number of researches on selenium-applying effect of crops, selenium-rich agricultural products such as selenium-rich apples, selenium-rich rice, selenium-rich lucid ganoderma and the like are successively appeared,

caulis et folium Ipomoeae Aquaticae, caulis et folium Brassicae Capitatae, herba Vaginati Japonicae, and folium Bambusae; the white trumpet-shaped flower is opened, and the center of the stem is hollow, so the flower is called as the water spinach. Swamp cabbage prefers high-temperature and humid environment, is suitable for humid soil, prefers sufficient illumination, and is generally cultivated as vegetables in rural areas in south China. The water spinach cultivated by selenium not only has rich nutrition, but also has obvious medical and health care effects, and has the functions of clearing away heat and toxic materials, treating constipation and diabetes, promoting urination, stopping bleeding, preventing cancer, losing weight and reducing fat, treating pyocutaneous disease and pyogenic infections, and the like; meanwhile, the selenium-rich water spinach has high sale price and good planting benefit. Therefore, the selenium-enriched water spinach is popular with producers and consumers.

Disclosure of Invention

The invention aims to provide a water planting method of water spinach rich in selenium and/or germanium, which effectively improves the cultivation efficiency of the water spinach and the content of the selenium and/or germanium in the water spinach through reasonable matching of the method and a water planting device.

In order to achieve the purpose, the invention adopts the following technical scheme: a water planting method of water spinach rich in trace elements comprises the following steps:

(1) seed soaking: soaking water spinach seeds in a nutrient solution containing trace elements for 4-7 hours, then moving the water spinach seeds into a germination accelerating chamber for accelerating germination for 2-5 days at the temperature of 20-28 ℃ to obtain the water spinach seeds;

(2) sowing: sowing the seeds of the water spinach in a hole tray with coconut chaff as a matrix, watering the seeds after sowing, covering a layer of plastic film, and removing the plastic film after the water spinach seedlings come out of the soil;

(3) water culture: when the height of the water spinach seedlings reaches 10-15 cm, the water spinach seedlings are transplanted to a water planting device for cultivation, and the nutrient solution containing trace elements is arranged in the water planting device;

(4) harvesting: harvesting when the height of the water spinach seedlings reaches 25-35 cm.

The nutrient substances required by seed germination are mainly from the seeds, mineral nutrient elements are supplemented to the seeds in a seed soaking mode, the early emergence of the seeds is promoted, and the emergence rate and the seedling quality are improved. From the viewpoint of improving the content of trace elements in the water spinach, the nutrient solution containing the trace elements is used for soaking seeds in the seed soaking stage capable of rapidly absorbing the elements, so that the content of the trace elements in the water spinach can be effectively improved. In the process of water absorption and soaking, the seeds are stirred from time to time as required to be fully contacted with the nutrient solution, and tiny bubbles at the periphery of each seed are removed, so that the absorption of the seeds on trace elements is promoted. In the process, the nutrient solution level is always higher than the seeds so as to prevent the seeds from being exposed outside the nutrient solution after water absorption and expansion to influence the seed soaking effect.

The seeding adopts hole wire rod dibbling, adopts coconut husk matrix, dibbles 2-3 seeds in each hole, waters immediately after seeding, covers plastic film to increase temperature and preserve moisture, and removes the film after the seedling emerges (about 7 days). After the seedlings grow to 10-15 cm high, the roots are cleaned and transplanted to a special water culture device. The water planting device is internally provided with the nutrient solution containing the trace elements, and the water spinach is always in the environment of the nutrient solution containing the trace elements in the growth process of the water spinach, so that the trace element absorption of the water spinach is improved.

Timely harvest is the key for high yield and high quality of the water spinach. In production, the seedlings can be harvested when the height of the seedlings is about 25-35 cm. During the first and second harvesting, 2-3 nodes are reserved at the stem base part, so that the sprouts can germinate after harvesting, lateral branches can be promoted, and high yield can be obtained. After 3-4 times of harvesting, the plant should be subjected to one-time re-harvesting, namely only 1-2 nodes are left at the stem base part, so that the phenomenon that the lateral branches are too much to cause weak growth is prevented.

Preferably, the nutrient solution containing the trace elements is a nutrient solution with the selenium concentration of 5-100mg/L or/and the germanium concentration of 50-1000 mg/L. The seeds have a limited capacity to absorb trace elements, and when the concentration of selenium or/and germanium is too high, the seeds cannot effectively absorb the trace elements, and the excessive selenium or/and germanium can inhibit the growth of plants and cause harm. The preferred nutrient solution containing trace elements is a selenium-germanium compound nutrient solution with the selenium concentration of 5-100mg/L and the germanium concentration of 50-1000mg/L, and because the selenium and the germanium have synergistic effect on physiological functions, the selenium-germanium mixed solution has larger effect on promoting immunologic function, oxidation resistance, cancer resistance and the like than the selenium and the germanium which are used independently, the germanium also has the toxicity effect of antagonizing the selenium, and the swamp cabbage plant simultaneously contains the selenium and the germanium in vivo, so the nutrient value is greatly improved. In addition, the selenium and germanium in the nutrient solution are used in a matching way, so that the absorptivity of the water spinach on the selenium and germanium can be improved.

The basic nutrient solution used in the invention can be a Hoagland nutrient solution formula or a Sheytt nutrient solution formula.

Preferably, the water planting device of the water spinach comprises: the planting device comprises a tank body and a plurality of planting plates, wherein the planting plates are arranged on the tank body, a plurality of fixing holes are formed in the planting plates, planting cups are arranged in the fixing holes, a spray pipe is arranged on the upper side of the tank body, and a plurality of spray heads are arranged on the spray pipe. Spray pipes are preferably arranged at the upper side of the tank body at a position of 1-1.5 meters, preferably one spray head is arranged on each spray pipe at a distance of 1-1.2 meters, the spray heads are cross atomizing micro spray heads, the water yield per hour is 25-35L, and the spraying radius is 0.5-0.7 meter.

Preferably, the device further comprises a solution pool, the solution pool is connected with the spray pipe, and the liquid in the solution pool is nutrient solution with selenium concentration of 5-100mg/L or/and germanium concentration of 50-1000 mg/L. The nutrient solution is sprayed once every 7 days through the cross atomizing micro-spray head, the atomized nutrient solution is condensed on the leaves of the water spinach, and selenium or/and germanium are absorbed by the leaves of the water spinach green onion. Too much nutrient solution can flow into the groove body, and the waste of the nutrient solution can not be caused.

Preferably, the device also comprises a nutrient solution pool, and the nutrient solution pool is connected with the groove body. The liquid in the nutrient solution pool is nutrient solution with selenium concentration of 5-100mg/L or/and germanium concentration of 50-1000mg/L, and the nutrient solution can be continuously conveyed into the water culture tank body.

Preferably, water pumps are arranged between the solution pool and the spray pipe and between the nutrient solution pool and the groove body. The water pump can be used for respectively conveying the nutrient solution in the solution pool and the nutrient solution pool to the spray pipe and the tank body, so that the nutrient solution can be continuously supplemented.

Preferably, a plurality of holes are uniformly formed in the periphery and the bottom of the planting cup. The holes around the planting cup are beneficial to the flow of water flow, so that the nutrient solution in the growing environment of the water spinach is in a flowing state, and the sufficient oxygen content in the nutrient solution is ensured; the holes at the bottom can ensure the up-and-down permeability, and are favorable for the root system of the water spinach to extend and grow into the water.

Preferably, the groove body is a cement brick groove, the length and width of the cement brick groove are 3000 cm and 140 cm respectively, and the height of the cement brick groove is 30-40 cm.

Preferably, the length and the width of the planting plate are 200 cm and 150 cm respectively, and the thickness is 5 cm.

The invention abandons the traditional technology of applying selenium fertilizer to soil, adopts a water culture method, and improves the absorption rate of water spinach on selenium or/germanium by combining a leaf surface spraying and root absorption; by using the method, the water spinach can be ensured to be always in the environment of selenium or/and germanium-rich nutrient solution from the beginning of seed germination until the harvest period, so that sufficient selenium or/and germanium sources are provided for the water spinach, the selenium or/and germanium are accumulated in the water spinach plants and the transformation period is longer, and finally the high-quality and stable-state water spinach rich in organic selenium or/and germanium is harvested.

The hydroponic device designed by the invention is simple to operate and convenient to use, and the designed groove body and the Nuo trunk planting plate are mutually independent parts, so that the transplanting and subsequent cleaning of water spinach seedlings are facilitated; the designed solution pool and the nutrient solution pool can continuously deliver selenium or/and germanium nutrient solution to the water spinach.

Drawings

FIG. 1 is a schematic diagram of the hydroponic apparatus of the present invention;

FIG. 2 is a schematic structural view of a planting cup of the present invention;

fig. 3 is a schematic structural diagram of the planting plate of the present invention.

In the figure, 100, a trough body; 200. a field planting plate; 210. a fixing hole; 300. planting a cup; 310. a pore; 400. a nozzle; 410. a spray head; 500. a solution pool; 600. a nutrient solution pool; 700. and (4) a water pump.

Detailed Description

The technical solution of the present invention is further described below by means of specific embodiments and accompanying drawings. The raw materials used in the examples of the present invention are those commonly used in the art, and the methods used in the examples are those conventional in the art, unless otherwise specified.

The water spinach watering device as shown in figures 1, 2 and 3 comprises: the water tank comprises a tank body 100 and a plurality of field planting plates 200, wherein the tank body 100 is a cement brick tank with the length and the width of 3000 centimeters and 140 centimeters respectively and the height of 30-40 centimeters, the water tank is preferably a cement water leakage prevention water tank with a certain gradient (generally less than 5 percent of gradient), the field planting plates 200 are preferably foam plates, the length and the width of the field planting plates 200 are 200 centimeters and 150 centimeters respectively, and the thickness of the field planting plates 200 is 5 centimeters. The field planting plate 200 is arranged on the tank body 100, and nutrient solution with selenium concentration of 5-100mg/L or/and germanium concentration of 50-1000mg/L is arranged in the tank body 100. The field planting plate 200 is provided with a plurality of fixing holes 210, and the field planting cup 300 is arranged in the fixing hole 210. The upper side of the tank body 100 is provided with a spray pipe 400, and the spray pipe 400 is provided with a plurality of spray heads 410. The spray pipe 400 is positioned at the upper side of the trough body 100, preferably, the spray pipe 400 is positioned at the position 1-1.5 meters higher than the center of the water trough; the interval between two adjacent spray heads 410 is preferably 1-1.2 m, and the spray heads 410 are preferably cross-shaped atomizing micro spray heads 410.

As shown in fig. 1, in addition to the above embodiment, the spray pipe further includes a solution tank 500, and the solution tank 500 is connected to the spray pipe 400. The solution tank 500 may be a box or a water tank, as long as it is a container capable of containing a nutrient solution.

As shown in fig. 1, on the basis of the above embodiment, the device further includes a nutrient solution tank 600, and the nutrient solution tank 600 is connected to the tank body 100.

As shown in fig. 1, in addition to the above embodiment, water pumps 700 are disposed between the solution tank 500 and the spray pipe 400 and between the nutrient solution tank 600 and the tank body 100.

As shown in fig. 2, in addition to the above embodiment, a plurality of pores 310 are uniformly formed around and at the bottom of the planting cup 300.

In the whole planting process, firstly, swamp spinach seeds are soaked in nutrient solution with 5-100mg/L of selenium concentration or/and 50-1000mg/L of germanium concentration for 4-7 hours and then are moved into a germination accelerating room to accelerate germination for 2-5 days at the temperature of 20-28 ℃ to obtain the swamp spinach seeds. Sowing the seeds of the water spinach in a hole tray with coconut chaff as a matrix, dibbling 2-3 seeds in each hole, watering immediately after sowing, covering a layer of plastic film for increasing temperature and preserving moisture, and removing the plastic film after the water spinach seedlings come out of the soil (generally, the water spinach seedlings can be taken out after about 7 days). Preparing a water culture device, selecting a tank body 100 as a cement brick tank with the length and the width of 3000 cm and 140 cm respectively and the height of 30-40 cm, injecting nutrient solution with the selenium concentration of 5-100mg/L or/and the germanium concentration of 50-1000mg/L into the tank body 100, covering a plurality of field planting plates 200 above the cement brick tank 100, wherein the length and the width of the field planting plates 200 are 200 cm and 150 cm respectively and the thickness is 5cm, a plurality of fixing holes 210 are arranged on the field planting plates 200, the size of each fixing hole 210 can just accommodate a field planting cup 300, designing a nutrient solution tank 600 at one side of the tank body 100, injecting the nutrient solution with the selenium concentration of 5-100mg/L or/and the germanium concentration of 50-1000mg/L fully, connecting the nutrient solution tank 600 with the tank body 100 through a water pump 700, designing a solution tank 500 at the other side of the tank body, the nutrient solution with the selenium concentration of 5-100mg/L or/and the germanium concentration of 50-1000mg/L is filled, a spray pipe 400 which is positioned 1-1.5 meters above the groove body 100 is connected with the solution pool 500 through a water pump 700, and a plurality of spray heads 410 are arranged on the spray pipe 400; when the height of the water spinach seedlings reaches 10-15 cm, the water spinach seedlings are transplanted into a planting cup 300, the planting cup 300 is inserted into a fixing hole 210, the water spinach seedlings grow in the planting cup 300, roots of the water spinach seedlings extend into nutrient solution through holes 310 on the periphery and the bottom of the planting cup 300 to absorb more nutrient solution, if the nutrient solution level of the tank body 100 is lower than the bottom of the planting cup 300, the nutrient solution in the nutrient solution tank 600 is pumped into the nutrient solution tank through a water pump 700, so that the nutrient solution level of the tank body 100 is not higher than the bottom of the planting cup 300, during the growth process of the water spinach seedlings, nutrient solution is sprayed to water spinach leaves through a spray nozzle 410 every 7 days, a spray nozzle 410 is arranged on each spray pipe 400 every 1-1.2 meters, the spray radius of each spray nozzle is 0.5-0.7 meters, so that all the water spinach leaves can be sprayed, the water yield of each nozzle is 1-1.5L every hour, and the excessive nutrient solution is sprayed into the tank body every hour, the waste of the nutrient solution can not be caused. After water planting cultivation, the water spinach seedlings can be harvested when the height reaches 25-35 cm.

Example 1

Soaking water spinach seeds in a selenium-containing nutrient solution for 4 hours, then placing the treated seeds in a germination accelerating chamber, accelerating germination for 4 days at 25 ℃ to obtain the sprouting water spinach seeds, dibbling by using hole rods during sowing, using coco coir as a substrate, dibbling 2 sprouting water spinach seeds in each hole, watering after sowing, covering a layer of plastic film, and removing the film after seedlings are unearthed. The seedlings can be grown after about 7 days, and after the seedlings grow to about 10cm high, the roots are cleaned and transplanted to a water culture device, and the seedlings are cultured by a water culture method. The seedlings can be harvested when the height of the seedlings is about 30 cm. The hydroponic device comprises: the device comprises a cement brick tank 100 with the length, width and height of 3000 cm, 140 cm and 20 cm respectively, wherein the cement brick tank 100 is provided with a selenium-containing nutrient solution, a foam planting plate 200 is placed above the tank 100, the length and width of the foam planting plate are 200 cm and 150 cm respectively, the thickness of the foam planting plate is 5cm, 20 fixing holes 210 are formed in the foam planting plate 200, and planting cups 300 are arranged in the fixing holes 210; the method comprises the steps of arranging a spray pipe 400 with the length of 3000 centimeters at a position 1.5 meters above a cement brick groove body 100, arranging a cross-shaped atomizing micro-spray nozzle 410 on the spray pipe 400 every 1 meter, spraying selenium-containing nutrient solution every seven days, arranging a solution tank 500 to be connected with the spray pipe 400 through a water pump 700, arranging a nutrient solution tank 600 to be connected with the cement brick groove body 100 through the water pump 700, and arranging the selenium-containing nutrient solution in the solution tank 500 and the nutrient solution tank 600.

The formula of the selenium-containing nutrient solution is as follows: ca (NO)₃)₂·4H₂O 1.18g/L，KNO₃0.51g/L，MgSO₄·7H₂O 0.49g/L，KH₂PO₄0.14g/L, 0.005g/L ferric tartrate and 10mg/L sodium selenate.

Example 2

Soaking water spinach seeds in a germanium-containing nutrient solution for 4 hours, then placing the treated seeds in a germination accelerating chamber, accelerating germination for 4 days at 25 ℃ to obtain the germinated water spinach seeds, dibbling the seeds by using hole rods during sowing, using coco coir as a substrate, dibbling 2 germinated water spinach seeds in each hole, watering the seeds after sowing, covering a layer of plastic film, and removing the film after seedlings come out of the soil. The seedlings can be grown after about 7 days, and after the seedlings grow to about 10cm high, the roots are cleaned and transplanted to a water culture device, and the seedlings are cultured by a water culture method. The seedlings can be harvested when the height of the seedlings is about 30 cm. The hydroponic device comprises: the concrete brick planting device comprises a cement brick tank body 100 with the length, width and height of 3000 cm, 140 cm and 20 cm respectively, wherein a nutrient solution containing germanium is arranged in the cement brick tank body 100, a foam planting plate 200 is placed above the tank body 100, the length and width of the foam planting plate 200 are 200 cm and 150 cm respectively, the thickness of the foam planting plate is 5cm, 20 fixing holes 210 are formed in the foam planting plate 200, and planting cups 300 are arranged in the fixing holes 210; the method comprises the steps of arranging a spray pipe 400 with the length of 3000 centimeters at a position 1.5 meters above a cement brick groove body 100, arranging a cross-shaped atomizing micro-spray nozzle 410 on the spray pipe 400 every 1 meter, spraying a germanium-containing nutrient solution every seven days, arranging a solution tank 500 to be connected with the spray pipe 400 through a water pump 700, arranging a nutrient solution tank 600 to be connected with the cement brick groove body 100 through the water pump 700, and arranging the germanium-containing nutrient solution in the solution tank 500 and the nutrient solution tank 600.

The formula of the germanium-containing nutrient solution is as follows: ca (NO)₃)₂·4H₂O 1.18g/L，KNO₃0.51g/L，MgSO₄·7H₂O 0.49g/L，KH₂PO₄0.14g/L, 0.005g/L ferric tartrate and 200mg/L germanium nitrate.

Example 3

Soaking water spinach seeds in a selenium-germanium containing composite nutrient solution for 4 hours, then placing the treated seeds in a germination accelerating chamber, accelerating germination for 4 days at 25 ℃ to obtain the germinated water spinach seeds, dibbling the seeds by using hole rods during sowing, using coco coir as a substrate, dibbling 2 germinated water spinach seeds in each hole, watering the seeds after sowing, covering a layer of plastic film, and removing the film after seedlings land. The seedlings can be grown after about 7 days, and after the seedlings grow to about 10cm high, the roots are cleaned and transplanted to a water culture device, and the seedlings are cultured by a water culture method. The seedlings can be harvested when the height of the seedlings is about 30 cm. The hydroponic device comprises: the concrete brick tank 100 is characterized by comprising a cement brick tank body 100, wherein the length, width and height of the cement brick tank body 100 are 3000 cm, 140 cm and 20 cm respectively, a selenium and germanium containing compound nutrient solution is arranged in the cement brick tank body 100, a foam planting plate 200 is placed above the tank body 100, the length and width of the foam planting plate 200 are 200 cm and 150 cm respectively, the thickness of the foam planting plate is 5cm, 20 fixing holes 210 are formed in the foam planting plate 200, and planting cups 300 are arranged in the fixing holes 210; the method comprises the steps of arranging a spray pipe 400 with the length of 3000 centimeters at a position 1.5 meters above a cement brick tank 100, arranging a cross-shaped atomizing micro-spray nozzle 410 on the spray pipe 400 every 1 meter, spraying selenium and germanium-containing compound nutrient solution every seven days, arranging a solution tank 500 to be connected with the spray pipe 400 through a water pump 700, arranging a nutrient solution tank 600 to be connected with the cement brick tank 100 through the water pump 700, and arranging the selenium and germanium-containing compound nutrient solution in the solution tank 500 and the nutrient solution tank 600.

The formula of the selenium-germanium-containing compound nutrient solution is as follows: ca (NO)₃)₂·4H₂O 1.18g/L，KNO₃0.51g/L，MgSO₄·7H₂O 0.49g/L，KH₂PO₄0.14g/L, 0.005g/L of ferric tartrate, 10mg/L of sodium selenate and 200mg/L of germanium nitrate.

Example 4

Soaking water spinach seeds in a selenium-germanium containing composite nutrient solution for 6 hours, then placing the treated seeds in a germination accelerating chamber, accelerating germination for 5 days at 28 ℃ to obtain the germinated water spinach seeds, dibbling the seeds by using hole rods during sowing, using coco coir as a substrate, dibbling 2 germinated water spinach seeds in each hole, watering the seeds after sowing, covering a layer of plastic film, and removing the film after seedlings land. The seedlings can be grown after about 7 days, and after the seedlings grow to about 15cm high, the roots are cleaned and transplanted to a water culture device, and the seedlings are cultured by a water culture method. The seedlings can be harvested when the height of the seedlings is about 35 cm. The hydroponic device comprises: the concrete brick tank 100 is characterized by comprising a cement brick tank body 100, wherein the length, width and height of the cement brick tank body 100 are 3000 cm, 140 cm and 20 cm respectively, a selenium and germanium containing compound nutrient solution is arranged in the cement brick tank body 100, a foam planting plate 200 is placed above the tank body 100, the length and width of the foam planting plate 200 are 200 cm and 150 cm respectively, the thickness of the foam planting plate is 5cm, 20 fixing holes 210 are formed in the foam planting plate 200, and planting cups 300 are arranged in the fixing holes 210; the method comprises the steps of arranging a spray pipe 400 with the length of 3000 centimeters at a position 1.5 meters above a cement brick tank 100, arranging a cross-shaped atomizing micro-spray nozzle 410 on the spray pipe 400 every 1 meter, spraying selenium and germanium-containing compound nutrient solution every seven days, arranging a solution tank 500 to be connected with the spray pipe 400 through a water pump 700, arranging a nutrient solution tank 600 to be connected with the cement brick tank 100 through the water pump 700, and arranging the selenium and germanium-containing compound nutrient solution in the solution tank 500 and the nutrient solution tank 600.

The formula of the selenium-germanium-containing compound nutrient solution is as follows: ca (NO)₃)₂·4H₂O 0.95g/L，KNO₃0.61g/L，MgSO₄·7H2O 0.49g/L，NH₄H₂PO₄0.12g/L, 0.005g/L of ferric tartrate, 20mg/L of sodium selenate and 300mg/L of germanium nitrate.

Comparative example 1

The difference between comparative example 1 and example 1 is: swamp spinach seeds of comparative example 1 were immersed in a basic nutrient solution containing no selenium, and the other steps were the same as in example 1.

Comparative example 2

The difference between comparative example 2 and example 1 is: the hydroponic apparatus of comparative example 2 was not equipped with a nozzle, and the other examples were the same as example 1.

Comparative example 3

The difference between comparative example 3 and example 1 is: comparative example 3 the tank of the hydroponic apparatus was filled with a basic nutrient solution containing no selenium.

The first water spinach harvested in examples 1-4 and comparative examples 1-3 was sampled at random for inspection and the selenium and germanium content in the water spinach was measured, and the results are shown in table 1.

TABLE 1 selenium germanium content of examples 1-4 and comparative examples 1-3 water spinach

As can be seen from the table 1, the swamp cabbages obtained by the technical scheme of the invention have high selenium and germanium content, and when the nutrient solution is a selenium and germanium compound nutrient solution, the selenium and germanium have mutual promotion absorption action, so that the selenium and germanium content of the harvested swamp cabbages is obviously higher than that of the nutrient solution using single selenium or germanium.

In addition, the technical scope of the invention is not exhaustive, and new technical solutions formed by equivalent replacement of single or multiple technical features in the embodiment technical solutions are also within the scope of the invention; meanwhile, in all the embodiments of the invention, which are listed or not listed, each parameter in the same embodiment represents only one example (i.e., a feasible solution) of the technical scheme.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A water planting method of water spinach rich in trace elements is characterized by comprising the following steps:

(4) harvesting: harvesting when the height of the water spinach seedlings reaches 25-35 cm; the nutrient solution containing trace elements is nutrient solution with selenium concentration of 5-100mg/L and germanium concentration of 50-1000 mg/L.

2. A method of hydroponic cultivation of water spinach rich in trace elements as claimed in claim 1, characterized in that said hydroponic cultivation means of water spinach comprise: the planting device comprises a tank body and a plurality of planting plates, wherein the planting plates are arranged on the tank body, a plurality of fixing holes are formed in the planting plates, planting cups are arranged in the fixing holes, a spray pipe is arranged on the upper side of the tank body, and a plurality of spray heads are arranged on the spray pipe.

3. A water planting method of water spinach rich in trace elements as claimed in claim 2, characterized by further comprising a solution tank connected with said spray pipe.

4. A water planting method of water spinach rich in trace elements as claimed in claim 2, further comprising a nutrient solution pool connected to the tank body.

5. The method of claim 2, wherein said planting cup is uniformly perforated with a plurality of holes around the perimeter and at the bottom.