Intermittent illumination yield increasing method

Abstract

The invention provides an intermittent illumination yield increasing method, which comprises the following steps of: arranging shading strips above the ground at certain intervals, and continuously shielding, releasing, re-shielding and re-releasing shadows of the shading strips to shield sunlight irradiating the same crop so as to intermittently illuminate the crop, the photosynthetic efficiency reduction caused by the photosynthesis inhibition mechanism activated by continuous strong light is avoided, so that the crop growth is stimulated, and the crop yield is increased. The device has multiple gain functions such as intermittent illumination yield increasing, water delivery irrigation yield increasing, night light supplementing yield increasing, bird repelling and rat repelling yield keeping, power generation / heat collection income increasing and the like, and agricultural production can be effectively promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural production, and specifically relates to a method for increasing yield (of agricultural production technology) by using intermittent illumination (to stimulate crops). Background Art

[0002] The existing sunshade net has dense meshes with a mesh size of 1-5mm. See the patent "A sunshade net for crop planting (CN106508529A)". Its main function is to shade and cool, evenly reduce direct sunlight, reduce the temperature of the ground and crop surface, and prevent high temperature from burning crops and excessive transpiration. The mesh size of the existing sunshade net is very small, which can only evenly reduce direct sunlight and cannot produce long-term low-frequency intermittent lighting; for example, it cannot block the sunlight that shines on crops every 20-90 minutes, and cannot form long-term low-frequency intermittent lighting. A "high-altitude photovoltaic power generation method for cultivated land and photovoltaic power generation cable" (CN117792235B) breaks through the limitation that traditional photovoltaic panels need to occupy a large area of ​​land, and achieves the invention purpose of photovoltaic without occupying land. According to its method, the sunlight is blocked for 3-5 minutes every 20 minutes every day. When intermittent lighting experiments are carried out in this way, it is unexpectedly found that intermittent lighting with specific technical parameters can stimulate the growth of crops such as dragon fruit and leafy vegetables, and can increase crop yields. Summary of the invention

[0003] The purpose of the present invention is to provide an intermittent lighting (stimulation of crops) yield increase (agricultural production technology) method, so that crops can obtain intermittent lighting to stimulate growth and increase yield.

[0004] The present invention discloses an intermittent illumination (crop stimulation) yield increasing (agricultural production technology) method, characterized in that it comprises the following steps: ① Above the ground (farmland, orchard, forest, etc.), at a certain distance - spacing K, hang a shading strip with a width of D and a height of H (roughly) along the north-south direction; the width D is 0.1m-1.28m (preferably 0.1m-0.5m or 0.2m-0.4m), the spacing K ≥ 0.1m or 0.2m or 0.3m or 0.5m or 1m (preferably K ≥ 0.5m), and the height H ≥ 1m or 2m or 3m or 5m or 10m or 20m (preferably H ≥ 3m); ② (Adjust technical parameters such as width D, spacing K and height H) so that the duty ratio D / K≤3 or 2 or 1 or 0.5 or 0.25 or 0.15, (so that the spacing ratio K / H≤0.1 or 0.5 or 1 or 2), (so as to) utilize the moving characteristics of the sun rising in the east and setting in the west, so that the shadows cast on the ground by multiple shading strips move from west to east, and continuously block, release, block again, and release again to intermittently block the sunlight irradiating the same crop, so as to provide (low-frequency and long-period) intermittent illumination to the crop (so as to avoid continuous strong light activating the inhibition mechanism of photosynthesis and causing a decrease in photosynthetic efficiency), thereby stimulating crop growth and increasing crop yields; in this way, there is no need for power / manpower to block the sunlight in turn through mechanical movement; ③ (Adjust technical parameters such as width D, spacing K and height H) Make sure that the same noon shadow or 45-degree shadow covers the same crop (such as the entire canopy) for no more than 30 minutes per time.

[0005] Preferably, the intermittent lighting (to stimulate crops) yield increase (agricultural production technology) method is characterized in that the shading strip includes a load-bearing cable, and the shading strip is supported from both ends of the load-bearing cable by tall supports and suspended in the air, and the span L between the two tall supports is ≥20m or 50m or 100m or 200m or 500m.

[0006] It is also preferred that the intermittent lighting (crop stimulation) yield increase (agricultural production technology) method is characterized in that it includes any one or more of the following technical features.

[0007] Technical feature ①, an irrigation water pipe is attached to the shading strip, so that the shading strip and the irrigation water pipe share the same load-bearing rope and towering support, which are used for irrigating crops and / or spraying pesticides, or spraying water and fertilizers.

[0008] Technical feature ② is that supplementary light is arranged on the shading strip, so that the shading strip, the supplementary light and its power wire share the same load-bearing rope and towering support, so as to provide supplementary light to light-loving crops at night to stimulate crop growth.

[0009] Technical feature ③: A loudspeaker and a simulated animal natural enemy are installed on the shading strip, so that the shading strip, the loudspeaker, the simulated animal natural enemy and the power wire share the same load-bearing rope and towering support to play the calls of the natural enemy to drive away birds or mice.

[0010] Technical feature ④: The north-south direction includes all directions in which the angle between the shading strip and the meridian is ≤5°, 10°, 15° or 39°.

[0011] Technical feature ⑤: The noon shadow or 45-degree shadow moves a distance equal to the width of the noon shadow every 1-20 minutes or every 1-5 minutes.

[0012] In order to unify the detection standards, this article defines the noon shadow as the shadow cast by the sun on the ground at noon (i.e. 11 a.m. to 1 p.m.). The shadow cast by the shading strip on the ground when the sun's rays make an angle of 45 degrees with the horizontal plane is defined as a 45-degree shadow.

[0013] Technical feature ⑥: multiple floating flags with a width of D are hung on a load-bearing cable to form a string of floating flag-style shading strips.

[0014] In the observation and investigation of the operation rules of the rotary vertical farm, it was found that the rotating tray needs to be adjusted according to the specific crop type, light intensity, light source type (such as natural light or artificial light), and system design. The common rotation cycle is 1-2 rotations per hour, and the tray needs to complete a full rotation every 30-60 minutes. This setting can reduce the crop tilt (phototropism) caused by uneven lighting. If the farm uses natural light as a light source, the system may need to be adjusted according to the sunshine time and angle, and a slower rotation cycle (such as one rotation every 2-3 hours) needs to be set to ensure that the crops are in the best position when the sunlight is at its peak. Based on this observation data, the following research test was conducted: set the duty cycle D / K=0.25, block the sunlight for 3-5 minutes every 20 minutes, (so) continuously block, release, block again, and release again to allow the crops to obtain intermittent light. The results show that it can stimulate crop growth and increase crop yields. Tests show that when the above intermittent lighting method is used, the sunlight absorbed by the crop is reduced by an average of 13-20%. Another set of test data shows that the shading strips (shadows) block the sunlight once every 20-90 minutes and illuminate the crops for 10-30 minutes each time. This low-frequency, long-period intermittent lighting has no effect on the photosynthesis and yield of the crops. Instead, it will stimulate crop growth and increase crop yield.

[0015] In summary, the more preferred technical feature ⑦ is: the shadow of the shading strip blocks the sunlight that irradiates the crop once every 20-90 minutes (i.e., low-frequency and long-cycle); each time the same crop (such as the entire canopy) is blocked for no more than 30 minutes (i.e., low-frequency and long-cycle) and no less than 3 minutes. For example, tests show that: blocking for 3-30 minutes and releasing for 20-90 minutes, and continuously blocking, releasing, blocking again, and releasing again to intermittently illuminate crops such as pitaya (low-frequency and long-cycle) can avoid the inhibition mechanism of photosynthesis activated by continuous strong light, which leads to a decrease in photosynthetic efficiency, thereby stimulating crop growth and increasing crop yields.

[0016] Research shows that the length of time a shadow stays on (i.e. passes over) the same crop is roughly inversely proportional to H and roughly proportional to D. Taking Xiuying District, Haikou City as an example, H is a 50-meter-high north-south shading strip, and the shadow movement speed at noon on March 4 (11 o'clock) is 68 cm / minute; if the height H of the shading strip is reduced to 4.6 meters, the shadow movement speed will drop to 2.5 cm / minute, and if the height H of the shading strip is reduced to 1.2 meters, the shadow movement speed will drop to 0.6 cm / minute. At noon on March 4 (13:30), the height H of the shading strip was reduced to 5 meters, and the shadow movement speed dropped to 1.3 cm / minute. Year-on-year observations show that the shadow of a 5-meter-high shading strip running east-west only moves (towards the south) at a speed of 1.28 mm / minute, which is too slow (it will prevent crops from photosynthesizing normally). This shows that we should try to avoid laying shading strips in an east-west direction, and instead lay them in a north-south direction as much as possible, and try to increase the height H of the shading strips to increase the speed of shadow movement and shorten the time that the shadow stays on (i.e. passes through) the same crop.

[0017] Another desirable feature is the technical feature ⑧, which is to attach a photovoltaic cell assembly to the shading strip, make the shading strip into a shading (photovoltaic) cell strip, and convert the sunlight blocked by the shading cell strip into electrical energy output; or to attach a solar vacuum heat collecting tube to the shading strip, make the shading strip into a shading (vacuum) heat collecting tube, and convert the sunlight blocked by the shading heat collecting tube into thermal energy output. They can block the sunlight to form a moving shadow, and also generate electricity (or collect heat) to increase income. From this subordinate function, the present invention also belongs to the invention in the field of agricultural-photovoltaic complementary technology.

[0018] It is also desirable that the width D of the shading strip is 1-15 times the canopy width of the crop (mainly below the shading strip). In this way, it can be ensured that in an intermittent light cycle, the entire canopy width of each crop can be in the shade within the set "cooling" time to stop and reduce light inhibition and light damage.

[0019] In specific implementation, the duty ratio D / K and intermittent light cycle and frequency should be selected according to the types of crops in the cultivated land. For crops that need shading nets to adjust the light level and non-economic forest land that does not care about the yield, such as vegetable crops such as lettuce, lettuce, spinach, cabbage, mustard, celery, green forest, grassland, etc., the duty ratio D / K can be appropriately increased, the spacing K of the shading strips can be appropriately reduced, and the width D of the shading strips can be increased.

[0020] The shading strips described in the present invention can be shading strips of various suitable shapes such as thin plates, films, cloth pieces, cylinders, triangular prisms, square prisms, and polygonal prisms; they can also be solar modules such as narrow photovoltaic panels and solar vacuum collector tubes.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects.

[0022] First, intermittent lighting can stimulate the growth of certain crops and increase crop yields: when the shading strips are oriented north-south, and the height ratio K / H is very small, and the duty cycle D / K is small, the shadows of multiple adjacent shading strips can block the sunlight in turn as the sun moves (without power / automatically and quickly) to allow crops to obtain low-frequency, long-period intermittent lighting, thereby stimulating crop growth and increasing the yield of certain crops. In the first application "Photovoltaic power generation method and photovoltaic power generation cable for high altitude cultivated land" (CN117792235B) paragraph 0013, only technical measures to avoid crop yield reduction caused by shadows are proposed, such as "try to use photovoltaic power generation cables with smaller thickness D and try to increase the spacing of photovoltaic power generation cables to ensure that the shadow of the photovoltaic power generation cable falls on the cultivated land and can quickly pass through the same crop as the sun moves, thereby avoiding the same crop from staying in the shadow of the photovoltaic power generation cable for a long time, which reduces photosynthesis and causes crop yield reduction." No technical inspiration on how to use intermittent lighting to increase production is given. In short, low-frequency and long-period intermittent lighting can stimulate crop growth and increase crop yield. It is a major scientific discovery that can be widely used in agricultural production.

[0023] Second, compared with the existing sunshade net, it has more functions, better effects, more economical and durable. The existing sunshade net has dense meshes with a mesh size of 1-5mm, see the patent "A sunshade net for crop planting (CN106508529A)". Its main function is to shade and cool, evenly reduce direct sunlight, reduce the temperature of the ground and crop surface, and prevent high temperature from burning crops and excessive transpiration. The mesh size of the existing sunshade net is very small, which can only evenly reduce direct sunlight, and cannot produce long-term low-frequency intermittent light to stimulate crop growth; for example, it cannot block the sunlight that shines on crops every 20-90 minutes, and cannot form long-term low-frequency intermittent light.

[0024] Third, it has a large span, strong wind resistance, and does not affect farming: the shading strips are like high-voltage wires passing through farmland, with a large span, high height, and strong wind resistance, and do not affect the operation of large agricultural machinery.

[0025] Fourth, compared with the current sunshade net, the comprehensive cost is reduced and the comprehensive benefits are improved. A set of systems has multiple functions such as intermittent lighting, water supply and irrigation, night lighting, bird and mouse driving, power generation / heat collection, etc., which can greatly reduce the comprehensive cost and greatly improve the comprehensive benefits. Cost calculation shows that the shading strips are more economical and durable than the current sunshade net. In short, the present invention can simultaneously have multiple beneficial functions such as intermittent lighting to increase production, water supply and irrigation to increase production, night lighting to increase production, bird and mouse driving to ensure production, power generation / heat collection to increase income, etc., which can effectively promote agricultural production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the application of an intermittent illumination yield-increasing method (where shading strips and load-bearing cables are cross-arranged) of the present invention (Example 1).

[0027] Figure 2 for Figure 1 Schematic diagram of the horizontal projection cross-sectional structure of the six shading strips on the cultivated land.

[0028] Figure 3 for Figure 1 Schematic diagram of the appearance structure of a shading strip.

[0029] Figure 4 This is a schematic diagram of the structure in which an irrigation water pipe is hung below the shading strip in the present invention (Example 2).

[0030] Figure 5 It is a structural schematic diagram of a supplementary light installed under the light-shielding strip in the present invention (Example 3).

[0031] Figure 6 This is a schematic diagram of the structure in which a loudspeaker is installed below the light-shielding strip in the present invention (Example 3).

[0032] Figure 7 This is a schematic diagram of the application of a section (with a gap of S length between two adjacent shading strips) of an intermittent illumination yield-increasing method of the present invention (Example 4).

[0033] Figure 8 This is a schematic diagram of the application of three strings of flying flag-type shading strips with multiple flying flags hung on load-bearing cables in the present invention (Example 6) suspended above a field.

[0034] Fig. 9 This is a schematic diagram of the application of a section of an intermittent illumination yield-increasing method (with a solar vacuum collector tube) of the present invention (Example 5).

[0035] Explanation of the accompanying figures: 1-shading strips, 2-load-bearing cables, 3-water pipes, 4-supplementary light, 5-speakers, 6-high supports, 601-support beams, 7-crops, 8-arable land, 9-shadows, 10-sun, 11-sunlight, 12-flying flags, 13-hanging components, 14-water, 15-large agricultural machinery, 16-photovoltaic cell modules, 17-solar vacuum collector tubes, 18-pipe joints, 19-shading cell strips. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] Embodiment 1.

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, thousands of load-bearing cables 2 are set up in the sky at a distance of 3-15 meters from the ground and 1-2 meters apart in an east-west direction over a thousand mu of cultivated land 8 (such as a wheat field, a vegetable field, a corn field, or an orchard).

[0039] It is best to use a high tensile strength load-bearing rope 2 greater than 1200 MPa, such as a galvanized prestressed steel strand of φ15.2×3, or a high-strength fiber rope, carbon fiber cable, or other load-bearing rope 2. These high-performance fiber ropes are mature commercial products and will not be described here. When needed, they can be customized or purchased from relevant manufacturers.

[0040] The load-bearing cable 2 is suspended above the cultivated land 8 through a 15-30 meter high support column or cable tower (similar to a power tower / pole) and other tall supports 6, like erecting a high-voltage transmission line. The height H of the load-bearing cable 2 from the crop 7 (such as the top of a coconut tree or the ground) can be set to 2 meters. For example, H can be ≥ 5m or 10m or 20m or 30m. In short, the height H should be high enough to ensure that the top of the crop 7 does not touch the load-bearing cable 2, and the large agricultural machinery 15 can pass unimpeded. The span L of a single span of the load-bearing cable 2 can be set to 100-300 meters. It can also be L ≥ 10m or 20m or 50m or 100m or 500m. In short, the span L should be large enough to reduce the number of tall supports 6, reduce the area occupied by the pile foundation, and avoid serious obstruction to the operation of the large agricultural machinery 15.

[0041] Order a batch of glass fiber reinforced plastic surface materials with a width D of 150mm and a length of 2284mm as shading strips 1 from relevant manufacturers. Then, install them on the load-bearing cables 2 along the north-south direction, and keep the spacing K at 1500mm, that is, the duty ratio D / K=0.1. In this way, the distance between their horizontal projections on the cultivated land 8 will also be equal to K, and will also be equal to 1500mm. It is best to make K≥0.5m. In short, the width D of the shading strips 1 and the width of their shadows 9 should be appropriately reduced, and the spacing K should be expanded as much as possible to ensure the minimum light needs for the growth of crops 7.

[0042] In order to reduce the number of pile foundations and save floor space, and to ensure that the load-bearing cables 2 can be erected along the east-west direction to ensure that the shading strips 1 can be laid along the north-south direction, during implementation, the supporting beams 601 in the towering supports 6 may not be rigid beams, but flexible beams, such as very thick steel cables (not shown).

[0043] It should be noted that, in the specific implementation, the width D of the shading strip 1 should be appropriately reduced, and the spacing K of the shading strip 1 should be appropriately increased, so as to ensure that the ratio of the width D of the shading strip 1 to the spacing of the horizontal projection of the shading strip 1 on the cultivated land 8 - the duty cycle D / K≤3 or 2 or 1 or 0.5 or 0.25 or 0.15, so that the shadow 9 of the same shading strip 1 can quickly (for example, within 5 minutes) pass through the same crop 7 as the sun 10 moves (preferably within 5 minutes to move a distance of the width D of the shading strip 1), so as to avoid the same crop 7 staying in the shadow 9 of the same shading strip 1 for a long time (for example, more than 30 minutes) and reducing photosynthesis, resulting in a reduction in crop 7 yield. Studies have found that the length of time that the shadow 9 stays on the same crop 7 is roughly inversely proportional to H and roughly proportional to D. It can be seen that in order to reduce the impact of shadows on crop growth, the hanging height and H of the shading strips 1 should be increased as much as possible, the width D of the shading strips 1 should be reduced as much as possible, and the spacing K of the shading strips 1 should be increased as much as possible. It is best to select H as 2-30m, the width D as 10-50cm, and the spacing K as 0.5-1m.

[0044] It is also preferred that the angle between the shading strip 1 and the meridian is ≤5° or 10° or 15° or 39°, and it is best to install the shading strip 1 along the north-south direction so that the spacing (distance) height (degree) ratio K / H is ≤0.1 or 0.5 or 1 or 2, so that the shadows 9 of multiple adjacent shading strips 1 can (automatically and quickly) take turns to block the sunlight 11 of the same crop 7 as the sun 10 moves, so that the crop 7 can obtain intermittent light, so as to stimulate the growth of the crop 7 and increase the yield of the crop 7.

[0045] Embodiment 2.

[0046] like Figure 4 As shown, an irrigation water pipe 3 is attached (externally or pre-buried) to the load-bearing cable 2, which is connected to the current drip irrigation / sprinkler irrigation system to realize the function of water delivery and irrigation (including spraying pesticides, etc.). The current drip irrigation / sprinkler irrigation system is also a mature commercial product and will not be described here. When it is needed, it can be ordered from the relevant manufacturer or a professional manufacturer can be asked to cooperate with the construction. In this way, the scheme of the present invention can also conveniently use the water pipe 3 to irrigate the cultivated land 8, such as using a very thin and light 8mm inner diameter plastic water pipe 3 to drip irrigate crops, to achieve functions such as irrigation and spraying. It is worth mentioning that when the water pipe 3 is high enough, for example, when H is 10-30 meters, the dripping water 14 will float down evenly like a drizzle, and the rain will moisten the cultivated land 8.

[0047] Embodiment three.

[0048] like Figure 5As shown, based on the above example, some crop growth lamps, namely supplementary light lamps 4, are attached (externally mounted or embedded) to the load-bearing cable 2, connected to the agricultural power grid, simulating daylight, helping the crop 7 to photosynthesize and promote growth, so as to realize the function of nighttime supplementary light and water delivery irrigation. In this way, the scheme of the present invention can also use the supplementary light lamps 4 to supplement light for the light-loving crop 7 at night, so as to promote the crop 7 to photosynthesize, grow and increase yield.

[0049] Preferably, if Figure 6 As shown, a speaker 5 such as a ceramic plate is attached to the load-bearing cable 2 and connected to the broadcasting system. When necessary, it is used to play sounds (including harassing sounds such as ultrasonic waves and calls of natural enemies) to drive away birds or mice, or to play music that crops like to promote the growth of crops 7. Among them, the shading strip 1 is preferably combined with the shading (photovoltaic) battery strip 19.

[0050] Embodiment 4.

[0051] like Figure 7 As shown, a photovoltaic cell assembly 16 is attached to the shading strip 1, and the shading strip 1 is made into a shading (photovoltaic) cell strip 19, and is hung on the same load-bearing cable 2, and is arranged in the same direction as the load-bearing cable 2. It is best to make (many) shading cell strips each float around the load-bearing cable 2 with the wind to reduce wind resistance, prevent linkage damage, and avoid being torn and destroyed by super typhoons; there is a gap of S between two adjacent shading cell strips, where S is ≥ 0.25m or 0.5m or 1m or 2m or 3m or 5m. In this way, the shading cell strip can convert the blocked sunlight 11 into electrical energy output, which can be used to block the sunlight 11 to form a moving shadow 9 and generate electricity to increase income.

[0052] Embodiment five.

[0053] like Fig. 9 As shown, a plurality of (double-pass) solar vacuum heat collecting tubes 17 are connected in series by pipe joints 18 and hung on the same load-bearing cable 2 to form a shading heat collecting tube. In this way, the shading heat collecting tube made of (double-pass) solar vacuum heat collecting tubes 17 can convert the blocked sunlight 11 into heat energy output, which can be used to block the sunlight 11 to form a moving shadow 9 and collect heat to increase the yield.

[0054] Embodiment six.

[0055] like Figure 8As shown, hundreds of thousands of (waterproof cloth) flags 12 with a width D of 0.4m and a length of 0.3m are hung on a load-bearing cable 2 that is hundreds of meters long, for example, the spacing K is set at 2 meters, and are hung on a high-strength fiber rope, thereby forming three strings of flag-type shading strips 1. The flags 12 in this embodiment are light and have low wind resistance, so the span L of the shading strip 1 can be hundreds of meters long, which can greatly reduce wind resistance, prevent it from being destroyed by super typhoons, and will not affect the operation of large agricultural machinery 15. The overall cost will be extremely low. In such an embodiment, the shadow of the flag 12 at noon is very narrow, but when the sunlight 11 is at an angle of 45 degrees to the horizontal plane, the shadow of the flag 12 projected on the ground is wider, that is, the 45-degree shadow is wider.

[0056] What is disclosed above is only a preferred embodiment of the present invention. The accompanying drawings are only structural schematic diagrams and are not drawn according to the actual size ratio. They cannot be used to limit the scope of rights of the present invention. Equivalent changes made based on the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An intermittent illumination yield increasing method, characterized in that: It includes the following steps: ① Above the ground, at a certain distance (interval K), a shading strip with a width of D and a height of H is arranged along the north-south direction; ② Make the duty ratio D / K ≤ 3 or 2 or 1 or 0.5 or 0.25 or 0.15, and use the movement characteristics of the sun rising in the east and setting in the west to make the shadows cast on the ground by the multiple shading strips move from west to east, and continuously block, release, block again, and release again to intermittently block the sunlight irradiating the same crop, so as to provide intermittent illumination to the crop, thereby stimulating crop growth and increasing crop yield; ③ The same midday shadow should not cover the same crop for more than 30 minutes each time.

2. The intermittent illumination yield increasing method according to claim 1, characterized in that: The shading strip includes a load-bearing cable, and the shading strip is supported from both ends of the load-bearing cable by high supports and suspended in the air. The span L between the two high supports is ≥ 20m or 50m or 100m or 200m or 500m.

3. The intermittent illumination yield increasing method according to claim 1 or 2, characterized in that: It includes any one or more of the following technical features: ① Attach an irrigation pipe to the shading strip so that the shading strip and the irrigation pipe share the same load-bearing rope and high support to irrigate crops and / or spray pesticides; ② Install supplementary light on the shading strip, so that the shading strip, supplementary light and its power wire share the same load-bearing rope and towering support, so as to supplement light for light-loving crops at night to stimulate crop growth; ③ Install loudspeakers and simulated animal predators on the shading strips, so that the shading strips, the loudspeakers, the simulated animal predators and the power wires share the same load-bearing rope and high-rise support, so as to broadcast the calls of the predators to drive away birds or mice; ④ The north-south direction includes all directions where the angle between the shading strip and the meridian is ≤5°, 10°, 15° or 39°; ⑤ The midday shadow moves a distance equal to the width of the midday shadow every 1-20 minutes or every 1-5 minutes; ⑥ Every 20-90 minutes, the shade strips should block the sunlight from reaching the crops; ⑦ Multiple floating flags with a width of D are hung on a load-bearing cable to form a string of floating flag-style shading strips; ⑧ Attach a photovoltaic cell assembly to the shading strip, make the shading strip into a shading cell strip, and convert the sunlight blocked by the shading cell strip into electrical energy output; or attach a solar vacuum collector tube to the shading strip, make the shading strip into a shading collector tube, and convert the sunlight blocked by the shading collector tube into thermal energy output.

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