How to store turf seeds

Abstract

The present invention aims to provide a highly practical and unprecedented method for preserving turfgrass. [Solution] A method for storing sod used in a sod-spraying construction method, comprising storing a mixture of sod 2, soil material 3, and rice husk charcoal 4 in a highly light-blocking bag 1 provided with numerous ventilation holes 1a.

Description

[[Technical Field]]

[0001] The present invention relates to a method for preserving sown turf. [[Background Art]]

[0002] In recent years, greening with turf on the slopes of river embankments, parks, and photovoltaic power generation facilities has been actively carried out.

[0003] Common greening methods include the seed spraying method, in which turf seeds and fertilizer are sprayed onto slopes, and the turf laying method, in which mat-shaped turf rhizomes are laid. However, the former has risks such as erosion and seed loss due to rainfall, while the latter has problems such as cumbersome aftercare.

[0004] Accordingly, the present applicant, as a technology replacing the existing construction methods described above, based on the knowledge obtained from the development of a turf growing method disclosed in Patent Document 1 proposed by the applicant (a sown turf construction method in which cut turf rhizomes (sown turf) are sown in soil and covered with a perforated sheet material to grow turf), devised a sown turf spraying construction method in which sown turf is mixed with a soil material (bark compost) and sprayed using a spraying machine.

[0005] However, the above construction method has the disadvantage that it increases the labor of mixing sown turf with soil material at the construction site, resulting in poor workability. To address this problem, if a premixed mixture of sown turf and soil material is prepared in advance, the mixing labor at the construction site can be reduced. However, a method for long-term storage of sown turf mixed with soil material has not been established. When sown turf is mixed with soil material, there are risks that the sown turf will wither and die in the soil material due to drying or other factors, or that the buds and roots of sown turf that have germinated and rooted in the soil will be damaged by impact during construction, leading to poor growth. Therefore, there is a need for a technology that suppresses growth while preventing withering and death in soil. Furthermore, if long-term storage becomes possible, there will be time leeway between the preparation of sown turf and the spraying operation, which also brings the advantage of making it easier to respond to sudden process changes. [[Prior Art Documents]] [[Patent Documents]]

[0006] [Patent Document 1] Patent No. 4739861 [Overview of the project] [Problems that the invention aims to solve]

[0007] This invention provides a novel and highly practical method for preserving turfgrass, which solves the aforementioned problems. [Means for solving the problem]

[0008] The gist of the present invention will be explained with reference to the attached drawings.

[0009] This invention relates to a method for preserving sod used in a sod-spraying construction method, characterized in that sod 2, soil material 3, and rice husk charcoal 4 are mixed and stored in a highly light-blocking bag 1 provided with numerous ventilation holes 1a.

[0010] Furthermore, the present invention relates to a method for preserving sod according to claim 1, characterized in that the ratio of soil material 3 to rice husk charcoal 4 is set to soil material 3:rice husk charcoal 4 = 90:10 volume%.

[0011] Furthermore, the present invention relates to a method for preserving sod as described in either claim 1 or 2, characterized in that the soil material 3 is made primarily from bark fertilizer.

[0012] Furthermore, a method for preserving turf according to either claim 1 or 2, wherein the ventilation holes 1a have a diameter of 1 mm and are numbered 750 per square meter. 2 This invention relates to a method for preserving turf sow, characterized by being provided at a certain density.

[0013] Furthermore, a method for preserving turf according to claim 3, wherein the ventilation holes 1a have a diameter of 1 mm and are numbered 750 per square meter. 2 This invention relates to a method for preserving turf sow, characterized by being provided at a certain density.

[0014] Further, the present invention relates to a method for preserving seeded turf according to any one of claims 1 and 2, characterized in that, as said bag body 1, a bag body 1 having a light shielding rate of 100% is employed.

[0015] Further, the present invention relates to a method for preserving seeded turf according to claim 3, characterized in that, as said bag body 1, a bag body 1 having a light shielding rate of 100% is employed.

[0016] Further, the present invention relates to a method for preserving seeded turf according to claim 4, characterized in that, as said bag body 1, a bag body 1 having a light shielding rate of 100% is employed.

[0017] Further, the present invention relates to a method for preserving seeded turf according to claim 5, characterized in that, as said bag body 1, a bag body 1 having a light shielding rate of 100% is employed. [Advantageous Effects of the Invention]

[0018] Since the present invention is configured as described above, it is an unprecedented very practical method for preserving seeded turf, for example, enabling long-term preservation of seeded turf in a state mixed with a soil material. [Brief Description of the Drawings]

[0019] [Figure 1] FIG. 1 is a schematic explanatory diagram of the method for preserving seeded turf according to the present example. [Figure 2] Table 1 is a table showing test conditions according to the present example. [Figure 3] Graph 1 is a graph showing test results according to the present example. [Figure 4] Graph 2 is a graph showing test results according to the present example. [Figure 5] Graph 3 is a graph showing test results according to the present example. [Figure 6] Graph 4 is a graph showing test results according to the present example. [Figure 7] Graph 5 is a graph showing test results according to the present example. [Figure 8]1 is a graph showing the results of a test according to the present example. [Figure 9] 1 is a table showing the results of a test according to the present example.

MODE FOR CARRYING OUT THE INVENTION

[0020] A preferred embodiment of the present invention will be briefly described below by showing the operation of the present invention with reference to the drawings.

[0021] According to the present invention, seeded turf 2, a soil material 3 and rice husk smoked charcoal 4 are mixed and stored in a highly light-shielding bag body 1 provided with a large number of ventilation holes 1a.

[0022] Using the seeded turf 2 stored for a long period (120 days) in this state (in a state where the soil material 3 taken out from the bag body 1 and the rice husk smoked charcoal 4 are mixed), a seeded turf spraying construction method was performed on a growth container. As a result, the seeded turf 2 grew favorably, and it was confirmed that the seeded turf 2 stored for a long period by the storage method according to the present invention can be applied to the seeded turf spraying construction method.

[0023] Therefore, the seeded turf 2 can be stored for a long period in a state of being mixed with the soil material 3, and thus the advantages of the seeded turf spraying construction method can be fully enjoyed, and greening of a construction area can be easily and favorably performed.

EXAMPLES

[0024] Specific examples of the present invention will be described with reference to the drawings.

[0025] The present example relates to a method for storing seeded turf used in a seeded turf spraying construction method, wherein seeded turf 2, a soil material 3 and rice husk smoked charcoal 4 are mixed and stored in a highly light-shielding bag body 1 provided with a large number of ventilation holes 1a.

[0026] The method for storing seeded turf according to the present example was completed after a test described below (hereinafter referred to as "the present test"), and can realize long-term storage of seeded turf 2 in a state of being mixed with the soil material 3.

[0027] First, this experiment was conducted using the following materials (1 bag, 2 sod seeds, 3 soil materials, and 4 rice husk charcoal).

[0028] Bag 1 is made of polyethylene and measures 700 mm in length and 470 mm in width with a capacity of 40 L. From the perspective of suppressing the growth of the sod 2 during storage, a color with high light-blocking properties is considered preferable, so two colors were used: black bag 1 and white bag 1 as a comparison. The light-blocking rate (1 - (illuminance inside the bag / illuminance outside the bag)) of both was investigated using a Kenis Corporation digital illuminometer 530 (resolution 0.1 lx), and the black bag 1 had a light-blocking rate of 100% (illuminance inside the bag 0 lx), while the white bag had a light-blocking rate of 47%.

[0029] Furthermore, the bag 1 is provided with numerous ventilation holes 1a scattered throughout to prevent spoilage of the contents due to excessive moisture. These ventilation holes 1a are approximately 1 mm in diameter and number 750 per square meter. 2 Two types were prepared: one with a high density (247 holes per bag (on one side)) and another with about 6 holes. Four patterns of bags were prepared by varying the light-blocking rate (color) and the number of ventilation holes 1a.

[0030] Sod 2 was made by cutting Zoysia japonica sod (grass that is commonly sold, processed into square mats with sides of about 30 cm) using a sod production device disclosed in Patent No. 6649976.

[0031] Soil material 3 used bark compost (organic fertilizer made by fermenting tree bark) as its main ingredient.

[0032] Rice husk charcoal 4 is made by carbonizing (steam-baking) rice husks in a low-oxygen (oxygen-free) state, and was used as a soil conditioner by mixing it with soil material 3.

[0033] One reason for selecting Rice Husk Charcoal 4 as a soil conditioner is the expectation that its porous structure, created by carbonization, will regulate moisture within the bag. The second reason is that, being an inorganic material, it can suppress the activity of soil microorganisms. Unfermented organic materials other than Rice Husk Charcoal 4 may be metabolized by soil microorganisms, potentially causing the generation of gases and other substances harmful to the turf.

[0034] Next, the specific contents of this examination are as follows:

[0035] Two types of soil mixtures were prepared to be mixed with the sod 2: one made of 100% soil material 3 (bark compost), and another made by mixing soil material 3 (bark compost) with 10% by volume of rice husk charcoal 4, taking into consideration the prevention of drying out and excessive moisture. In other words, the ratio of soil material 3 to rice husk charcoal 4 was set to soil material 3:rice husk charcoal 4 = 90:10 by volume.

[0036] 25g of seedling 2 (Zoysia japonica), cut by a seedling production device, was mixed into the prepared mixture, and the mixture was stored in the aforementioned bag 1 (a polyethylene bag) for 22 days and 120 days. Two types of soil and four types of bags were combined to conduct tests under a total of 16 storage conditions (see Figure 2).

[0037] For the storage period used for comparison, we set 22 days as the short-term period for which we had a proven track record through trial storage, and assumed that the maximum storage period considered necessary for construction was 120 days. We then conducted tests using the above storage periods.

[0038] The storage location was kept at a room temperature of 15 degrees Celsius day and night, and care was taken to prevent direct sunlight from hitting the bag 1.

[0039] The stored sod seeds 2 were removed 22 and 120 days after the start of storage. Sod seeds 2 may germinate during storage. Therefore, the length of the germinated sprouts of the removed sod seeds 2 was measured, and the number of elongated sprouts (5 mm or more) and non-elongated sprouts (less than 5 mm) were counted. After measurement, sod seeds 2, along with the soil material 3 inside bag 1, were sown into planters and grown.

[0040] Subsequently, after the growing season for sod 2 (Zoysia japonica), which is from May to October, had passed, the sod 2 (Zoysia japonica) was removed from the planter and its dry weight was measured.

[0041] We compared the dry weight under different storage conditions, and determined that the higher the dry weight (indicating better growth), the more suitable the conditions under which the sod was stored.

[0042] As a result of this test, plants No. 9 and No. 16 in Figure 2 died due to a problem with the irrigation system during cultivation in planters. However, it was confirmed that the remaining 14 patterns could be stored for up to 120 days. The following test results exclude No. 9 and No. 16.

[0043] Specifically, when comparing the average dry weight over different storage periods, the average dry weight after 22 days of storage was 211g, and the average dry weight after 120 days was 156g (see Figure 3). This shows that the material is suitable for the sowing and spraying method after 22 days of storage, and is also suitable for the sowing and spraying method even after long-term storage of 120 days.

[0044] Furthermore, the results of this examination are detailed as follows:

[0045] <For short-term storage (22 days)> When comparing the average dry weight based on the number of ventilation holes 1a, the average dry weight was approximately the same, at 215g when there were many ventilation holes 1a and 207g when there were few (see Figure 4(a)).

[0046] When comparing by bag color, the average dry weight when stored in black bag 1 was 253g, while the average dry weight when stored in white bag 1 was 180g (see Figure 4(b)). This indicates that the average dry weight increased when stored in black bag 1 compared to when stored in white bag 1.

[0047] When comparing the cases with and without rice husk charcoal 4, the average dry weight when rice husk charcoal 4 was mixed was 177g, while the average dry weight when it was not mixed was 238g (see Figure 4(b)). This shows that the dry weight increased when rice husk charcoal 4 was not mixed compared to when it was mixed.

[0048] Next, we compared the number of germinated seeds with a germination length of 5 mm or more, before sowing in planters, under different storage conditions.

[0049] When comparing the number of vents 1a, the number of germinated seeds was 44 when there were many vents 1a and 61 when there were few, indicating that the number of germinated seeds decreased when there were more vents 1a (see Figure 5(a)).

[0050] When comparing by the color of the seed bags, the number of germinated seeds was 37 when stored in black seed bags 1, and 68 when stored in white seed bags, indicating that the number of germinated seeds was lower when stored in black seed bags 1 (see Figure 5(b)).

[0051] When comparing the cases with and without rice husk charcoal 4, the number of germinated seeds was 45 when rice husk charcoal 4 was mixed in, and 60 when it was not mixed in, indicating that the number of germinated seeds decreased when rice husk charcoal 4 was added (see Figure 5(c)).

[0052] <For long-term storage (120 days)> When comparing the average dry weight based on the number of ventilation holes 1a, the average dry weight was 150g when there were many ventilation holes 1a, and 163g when there were few ventilation holes 1a, indicating that the dry weight increased when there were fewer ventilation holes 1a (see Figure 6(a)).

[0053] When comparing by bag color, the average dry weight when stored in black bag 1 was 145g, while the average dry weight when stored in white bag 1 was 138g. This indicates that the average dry weight increased when stored in black bag 1 compared to when stored in white bag (see Figure 6(b)).

[0054] When comparing the cases with and without rice husk charcoal 4, the average dry weight when rice husk charcoal 4 was mixed was 168g, while the average dry weight when it was not mixed was 140g. Therefore, when rice husk charcoal 4 was mixed, the dry weight increased compared to when it was not mixed (see Figure 6(c)).

[0055] Next, we compared the number of germinated seeds with a total germination length of 5 mm or more, before sowing in planters, under different storage conditions.

[0056] When comparing the number of vents 1a, the number of germinated seeds was 78 when there were many vents 1a and 92 when there were few, indicating that the number of germinated seeds decreased when there were more vents 1a (see Figure 7(a)).

[0057] When comparing by the color of the seed bags, the number of germinated seeds was 69 when stored in black seed bags 1, and 101 when stored in white seed bags, indicating that the number of germinated seeds was lower when stored in black seed bags 1 (see Figure 7(b)).

[0058] When comparing the cases with and without rice husk charcoal 4, the number of germinated seeds was 80 when rice husk charcoal 4 was mixed in, and 90 when it was not mixed in, indicating that the number of germinated seeds decreased when rice husk charcoal 4 was added (see Figure 7(c)).

[0059] <Correlation between dry weight and the number of germinated germinated grains larger than 5mm> When we examined the relationship between the dry weight after growth and the number of germinated seeds with a germination length of 5 mm or more at the time of sowing, a negative correlation was observed (r = -0.44), as shown in Figures 8 and 9. When examined by storage period, a slightly stronger correlation was observed, with a correlation coefficient of r = -0.46 for 22 days of storage and r = -0.62 for 120 days of storage.

[0060] <Consideration> A negative correlation was observed between the dry weight after growth and the number of germinated seeds with a length of 5 mm or more at the time of sowing. This suggests that the growth of sow turf 2 during storage negatively affects growth after sowing, and this effect becomes stronger when stored for long periods. As mentioned above, this is thought to be because grown and elongated sprouts are easily damaged at the time of sowing and are vulnerable to drying after sowing.

[0061] Next, we consider the factors that inhibit the growth of the turfgrass seedlings 2 within the bag 1.

[0062] Inferring from the relationship between the number of germinated seeds larger than 5 mm and the storage conditions, it was suggested that mixing rice husk charcoal 4 with soil material 3 is better for suppressing the growth of sod 2, and that it is better to provide many ventilation holes 1a and store it in a black bag 1. In this experiment, the sod 2 was kept wet from the time of cutting until storage to prevent it from dying due to drying. Since the wet sod 2 was sealed in the bag 1 together with soil material 3, it is thought that the rice husk charcoal 4 and the ventilation holes 1a of the bag 1 exerted a dehumidifying effect inside the bag 1 in this experiment. It is thought that the growth of the sod 2 was suppressed by keeping it in an appropriate dry state due to the rice husk charcoal 4 and the many ventilation holes 1a.

[0063] Furthermore, the black color of bag 1 suggests that the shading effect inside bag 1 inhibited the growth of the sod sown 2.

[0064] The relationship between the dry weight after growth and the storage conditions suggests that storage conditions such as rice husk charcoal 4 and black bags 1 have a positive effect on the dry weight, supporting the idea that the growth inhibition described above promoted growth after sowing.

[0065] On the other hand, the positive or negative effect on dry weight was observed to change depending on the storage period. Regarding rice husk charcoal 4, dry weight increased when not mixed during short-term storage (22 days), while dry weight increased when mixed during long-term storage (120 days). Regardless of the length of storage, the number of germinations larger than 5mm decreased when rice husk charcoal 4 was mixed, suggesting that growth inhibition continued. Rice husk charcoal 4 is a soil conditioner with a porous structure containing numerous fine pores on its surface. In humid environments, it absorbs excess moisture within the porous structure, and in dry environments, it releases moisture, thus providing humidity control. In this test, it appears that it prevented drying during long-term storage (120 days), leading to an increase in dry weight. However, during short-term storage (22 days), it is possible that the dehumidifying effect due to moisture absorption was excessive. Ideally, a re-examination of the amount of rice husk charcoal 4 mixed during short-term storage would be necessary, but even at this level, it is within the applicable range.

[0066] Similarly, regarding the ventilation holes 1a, in short-term storage (22 days), a greater number of ventilation holes 1a resulted in increased dry weight, while in long-term storage (120 days), a smaller number of ventilation holes 1a resulted in increased dry weight. Regardless of the length of storage, a greater number of ventilation holes 1a resulted in a decrease in the number of germinations of 5 mm or larger, suggesting that growth inhibition continues. The ventilation holes 1a are expected to have the effect of expelling excess moisture from inside the bag 1 to the outside, but it is possible that prolonged storage may result in excessive expulsion. Excessive expulsion of moisture from inside the bag 1 may cause drying and death of the sod 2, potentially negatively impacting growth after sowing, but in this experiment, no clear adverse effects such as a decrease in the total number of germinations were observed in the sod at the time of sowing.

[0067] <Summary> This experiment suggested conditions for preserving sod 2 while maintaining good growth after sowing. This clarified the specific methods and conditions for the initial objective of manufacturing sod 2 before the construction period and preserving it until the construction date. Further results can be expected by verifying the validity of the inferred preservation conditions through sowing using a spraying machine in an actual field.

[0068] Furthermore, the study suggested that optimal conditions may differ depending on the storage period. Although not covered in this study, factors such as the amount of turfgrass 2 stored at one time and the storage temperature are also thought to affect the growth of turfgrass 2. Future studies may reveal more detailed optimal storage conditions.

[0069] Based on the results of the above test, this embodiment provides a method for storing sod 2 used in the sod-spraying method, in which sod 2, soil material 3, and rice husk charcoal 4 are mixed and stored in a highly light-blocking bag 1 with numerous ventilation holes 1a, as shown in Figure 1. The storage location 10 should ideally be a place where the room temperature (air temperature) does not exceed 15 degrees Celsius at all times, and where the bag 1 is not exposed to direct sunlight.

[0070] In this embodiment, the ratio of soil material 3 to rice husk charcoal 4 is set to soil material 3:rice husk charcoal 4 = 90:10 volume%.

[0071] Furthermore, in this embodiment, soil material 3 is used, which is primarily composed of bark fertilizer. However, the primary ingredient of soil material 3 is not limited to bark fertilizer.

[0072] In this embodiment, the ventilation holes 1a have a diameter of 1 mm and are numbered 750 per square meter. 2 They are scattered to achieve a certain density.

[0073] As this embodiment is configured as described above, the sod turf 2 can be stored for a long period of time while mixed with the soil material 3, thereby maximizing the benefits of the sod turf spraying method and enabling easy and effective greening of the construction area.

[0074] Furthermore, the present invention is not limited to the embodiments, and the specific configuration of each constituent element can be designed as appropriate. [Explanation of symbols]

[0075] 1 bag body 1a Ventilation holes 2. Sowing turf 3 Soil materials 4. Rice husk charcoal

Claims

1. A method for preserving sod used in sod-spraying construction, characterized in that sod, soil material, and rice husk charcoal are mixed and stored in a highly light-blocking bag with numerous ventilation holes.

2. A method for preserving sod according to claim 1, characterized in that the ratio of soil material to rice husk charcoal is set to soil material:rice husk charcoal = 90:10 volume%.

3. A method for preserving sod according to either claim 1 or 2, characterized in that a soil material mainly composed of bark fertilizer is used as the soil material.

4. A method for preserving turf according to either claim 1 or 2, wherein the ventilation holes have a diameter of 1 mm and are numbered 750 per square meter. ２ A method for preserving turf seeds, characterized by being provided at a certain density.

5. A method for preserving turf according to claim 3, wherein the ventilation holes have a diameter of 1 mm and are numbered 750 per square meter. ２ A method for preserving turf seeds, characterized by being provided at a certain density.

6. A method for preserving turf seeds according to either claim 1 or 2, characterized in that a bag with a light-shielding rate of 100% is used as the bag.

7. A method for preserving turf seeds according to claim 3, characterized in that a bag with a light-shielding rate of 100% is used as the bag.

8. A method for preserving turf seeds according to claim 4, characterized in that a bag with a light-shielding rate of 100% is used as the bag.

9. A method for preserving turf seeds according to claim 5, characterized in that a bag with a light-shielding rate of 100% is used as the bag.

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