JP2014108057A - Method of efficiently producing cedar rooted cutting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of improving production efficiency of a cedar rooted cutting to equalize picking scion work and rooted cutting work, in mass production of the cedar rooted cutting.SOLUTION: In a method of producing a cedar seedling, a cedar scion after planting is cultured in a facility in which temperature is adjusted, and the cedar scion is used as a cedar seedling. The cedar scion is picked in autumn or winter, and a low-temperature treatment is applied for the scion before planting.

Description

  The present invention relates to a method for efficiently producing (producing) a cedar cutting seedling (hereinafter sometimes referred to as a “cedar cutting seedling”).

Sugi is no exception, as post-war reforested land has entered the main cutting season and there is an urgent need to develop a seedling production system for forestry. Japanese cedar seedlings are produced mainly by seedlings, but in the Kyushu region, seedlings are raised by cuttings. Cutting seedlings in Kyushu are generally practiced by cutting green branches in the open ground.
The cuttings in the Kyushu region are mainly spring cuttings that are inserted from mid-March to mid-April, when the shoots are about the size of a rice grain, or autumn cuttings that are complementarily performed from early September to mid-October. is there. In addition, cuttings in summer are generally centered on the rainy season, and are not performed during the high temperature period after the rainy season. The reason is that not only it is difficult to create an optimal environment for rooting due to high temperature, but also the transpiration and respiration of the cuttings are active, so that it is difficult to root easily. Winter cutting is not the appropriate time for special cuttings, but is limited to plants with high added value, such as plants that are easy to root and greenhouse plants.

By the way, the cutting time of general trees includes spring cutting, summer cutting, autumn cutting and winter cutting, in which cuttings are performed in spring, summer, autumn and winter, respectively, throughout the year. However, winter cutting is not common and is often performed under heat-retaining conditions using a greenhouse or the like in plants that are easy to root or cuttings that are aimed at the shipping season.
In addition, cedars are not winter-inserted in the seedling method using the facilities described later, not to mention that winter inserts are not performed in the rough field production. In other words, the use of winter ears exists as a general cutting technique, but cedar cuttings are not incorporated into the planting system, and there is no report on it.

On the other hand, methods for exposing cuttings to low temperatures are known in the production of cuttings and seedlings of vegetables, flowering plants or certain trees (Patent Documents 1 to 4, Non-Patent Document 1).
Specifically, Patent Documents 1 and 2 disclose a technique for rooting using a dormant seedling in a broad-leaved tree, and a method of cutting and cutting a tree from a mother tree that has passed the dormancy period in Satsuki and Azalea, respectively. Has been.

In Patent Document 3, for the vegetables such as eggplant and tomato, chrysanthemum, and oleander and poplar trees, the temperature of the atmosphere in which the cuttings are exposed is maintained at a lower temperature (0 to 20 ° C.) than the curing water. A method for raising a plant cutting seedling of a plant characterized in that it is cured is disclosed.
In Patent Document 4, the stem or branch of a cut flower plant or flower tree (the cut flower plant is chrysanthemum or carnation, and the flower tree is rose, plum, peach, grape, oyster, pear, kiwi or mandarin orange). The cuttings or cuttings obtained by cutting are stored in air at a temperature of 1 ° C to 5 ° C, preferably 2 ° C to 3 ° C in a refrigerator for 6 to 21 days, preferably 7 to 14 days. Discloses a method comprising cryogenic treatment of cuttings or cuttings.

Non-Patent Document 1 discloses a method of efficiently promoting rooting while suppressing plant consumption by immersing the open end of a cucumber cutting in a warm culture solution in a low light and low temperature environment. It is disclosed.
Non-Patent Document 2 usually uses cedar cuttings of 40-50 cm in length (usually cuttings), whereas 20 cm small cuttings, about half the size of normal cuttings, are picked in the fall. However, a method for raising a cedar seedling to be inserted into an open field is disclosed.

  As a technique for raising cedar seedlings, a method of cuttings in a facility where environmental conditions can be adjusted is also known. In particular, labor saving and cost reduction by container seedling are being promoted and gradually spreading. However, in the method using the container seedling and the facility, the cuttings are from mid-March to mid-April or from early September to mid-October, as in the case of the open ground, so annual production and mass production are still unacceptable. Is possible.

Japanese Patent No. 5070401 JP-A-5-328840 Japanese Patent No. 4848234 JP 2003-304760 A

Terakura et al., “Effects of heating treatment of a short-term supply culture during low-temperature storage of cucumber cuttings on quality during storage and rooting after storage”, Biological environment regulation, 42 (2), p. 331-337, 2004 “Grow small seedlings large-seedling production with small cuttings”, Forestry Center Information: No. 26 (January 2005), Internet <http://www.pref.miyazaki.lg.jp/contents/org/kankyo/shinrin/mfc/lib/cj2602.html>

Despite the increasing demand for domestic timber in recent years, the supply system for cuttings and seedlings for afforestation cedar has rather declined, so a system that can efficiently supply a large amount of seedlings is required.
Nonetheless, as mentioned above, cedar cuttings have a limited heading time, so for example, the harvesting and insertion work is concentrated in early spring, limiting the production capacity of seedling producers. It is a factor. In addition, as described in Non-Patent Document 2, there is a seedling raising method in which small cuttings are picked and inserted in the fall, but in this method, the seedlings have a half year longer than the usual method of one and a half years. Cost. Therefore, this method is not a seedling raising method that can efficiently supply a large amount of seedlings.
In addition, when the present inventors investigated the rooting rate by inserting cedar cuttings at the anniversary, cuttings after the appropriate period of spring cutting are likely to wither, and the rooting rate is extremely low. It was confirmed that this technique is inappropriate, and it is also necessary to have a technique for appropriately performing cuttings in summer.
Therefore, it is an urgent task to solve the problem of leveling of heading and cutting operations, especially in efficient mass production of cuttings by year-round seedlings using a greenhouse.
In order to stably supply a large amount of domestically-produced timber that will reach the main harvesting period in the future, it is necessary to carry out logging work at the anniversary according to the needs of the market. At that time, considering low-cost forestry in the future, it is necessary to plant trees at the same time as logging work, so in that sense, a system for supplying high-quality seedlings regardless of the season is required.

  In other words, in mass production of cedar cutting seedlings, it is an urgent issue that should be solved as soon as possible to establish a technique to improve the production efficiency of cedar cutting seedlings for leveling of heading and cutting work. is there.

As a result of intensive studies to solve the above problems, the present inventors produce cedar cutting seedlings more efficiently than before by using cedar cutting ears that have not been studied for use until now. As a result of finding out that the anniversary production is possible and further researching, the present invention has been completed.
More specifically, based on the following identified items:
(1) In the high temperature period, the rooting yield should be remarkably better by using the cuttings picked in the low temperature period compared with those picked in the summer.
(2) In the low temperature period, by using the cuttings picked in the low temperature period and further controlling the optimal rooting conditions in the facility, the rooting rate and the amount of rooting are extremely high compared to other periods. To be obtained.

That is, the present invention relates to at least the following inventions:
(1) A method for producing a cedar seedling by growing a cedar ear in a temperature-controlled facility after being inserted, and using the cedar ear as a cedar seedling, wherein the cedar ear is A method for producing a cedar seedling, which is an ear picked in autumn or winter and subjected to a low-temperature treatment before the cuttings are made.
(2) The method according to any one of the above methods, wherein the low-temperature treatment is performed on the cedar ears before picking, and the cedar ears are picked from December to February after being subjected to the low-temperature treatment.
(3) The method according to any one of the above, wherein the low-temperature treatment is performed on the cedar spikes after harvesting, and the cedar spikes are spikes performed in October to November.
(4) The method according to any one of the above methods, wherein the spiked cedar ears are further refrigerated.
(5) The method according to any one of the above, wherein the low temperature treatment includes a step of exposing the ears before harvesting to a low temperature on the mother tree.
(6) Low-temperature treatment by cuttings by autumn or winter insertion in cold places or low-temperature treatment by refrigeration, and the low-temperature treated ears in a container for raising seedlings (hereinafter sometimes referred to as containers) in summer Any of the above methods further comprising changing floors and subjecting to growth in a temperature controlled facility.
(7) Growth in the temperature-controlled facility is performed in autumn or winter, and the temperature-controlled temperature in the facility is 10 ° C or higher at night temperature and / or 20 ° C or higher and 35 ° C or lower in average temperature. Any of the above methods.
(8) The method according to any one of the above, wherein the humidity is further adjusted and the relative humidity is 60% or more.
(9) The said method whose density of the inserted ear is 150 strains / m < ² > or more.
(10) A method for producing a large number of cedar seedlings in a year by combining any one of the above methods and ordinary cedar seedlings by spring insertion during one year.
(11) The said method including the method of said (2) and the method of said (3).
(12) The low-temperature treatment performed on the cedar ears after harvesting is a low-temperature treatment by cutting or cutting in the autumn or winter insertion of the collected ears at a low temperature, and the low-temperature treatment by refrigeration The method further comprising: changing the container into a container in summer and subjecting the ear to growth in a temperature-controlled facility.

In the production of Japanese cedar cuttings, only the spring cutting is mainly used for the fall, and the summer or winter cutting has not been carried out so far, and even it may be considered. There wasn't. However, according to the present invention, it is possible to produce cedar-cutting seedlings with high production efficiency by summer insertion or winter insertion.
In the method according to the present invention, the yield of ears that finally become cutting seedlings is excellent. That is, as described above, summer cuttings are not only difficult to create an optimal environment for rooting due to high temperatures, but also the transpiration and respiration of the cuttings are active, so that the seedlings after cuttings tend to wither, and the rooting rate In view of the background that it was not performed due to the reason that it is low, it is impossible for even those skilled in the art to predict that a high rooting rate can be achieved in the present invention without dying even in a high temperature environment. It is a remarkable effect.
According to the method of the present invention, for the cuttings of Japanese cedar picked from autumn to winter, after insertion, generally by creating environmental conditions suitable for rooting in a temperature-controlled facility, The rooting power (rooting rate, rooting vigor) can be made higher than the cuttings at the time of harvesting, and the yield is high, efficient, and low-cost cedar cuttings can be produced.

According to the method of the present invention, low-temperature treatment is performed on cedar spikes before picking, and the cedar spikes are picked and inserted in December to February after being subjected to low-temperature treatment. In addition, cedar cuttings can be produced with even higher production efficiency.
For example, by performing the heading work concentrated in March to April from December, the work period can be extended and the work force can be leveled. This reduces labor costs and improves work efficiency. In particular, the leveling effect is extremely large because the winter season is an off-season for raising seedlings.

According to the method of the present invention, low-temperature treatment is performed on cedar spikes after harvesting, and the harvesting is performed from October to November, so that cutting seedlings can be produced more efficiently. it can.
Among the methods of the present invention, according to the method in which the ears of cedar after harvesting are further subjected to refrigeration, or the low temperature treatment includes a step of exposing the ears before harvesting to a low temperature on the mother tree, Furthermore, cuttings can be produced more efficiently. By storing it in a refrigerator or the like as a refrigeration method, it is possible to use cuttings with high rooting ability at any time, including periods that have been regarded as inappropriate for heading so far, making cuttings more efficient and effective. Improvement of seedling rate is achieved.

Among the methods of the present invention, the low-temperature treatment is a low-temperature treatment by autumn cutting or winter insertion at a low-temperature location of the collected ears or cutting by winter cutting or low-temperature treatment by refrigeration, and the low-temperature treated ears are containerized in summer According to the method that further includes changing the floor and subjecting it to growth in a temperature-controlled facility, it is possible to more easily produce a cedar-cutting seedling.
Of these methods, after insertion by autumn or winter insertion, the presence or absence of rooting in the ears was investigated after a predetermined number of days, and the ears that were confirmed not rooted were grown in a temperature-controlled facility. According to the method including attaching to, the yield in manufacture of a cedar cutting seedling can be further improved.

Among the methods of the present invention, growth in a temperature-controlled facility is carried out in autumn or winter, and the temperature-controlled temperature in the facility is a night temperature of 10 ° C or higher and / or an average temperature of 20 ° C or higher and 35 °. According to a method of C or less, or a method in which the humidity in the facility is adjusted and the relative humidity is 60% or more, cuttings and seedlings can be produced more efficiently.
Among the methods of the present invention, according to the method in which the density of the spiked ears is 150 strains / m ² or more, it is possible to produce cedar-cutting seedlings with higher production efficiency.

According to any one of the above-described methods of the present invention and the method of producing cedar seedlings by usual spring cutting in one year, and producing a large number of cedar seedlings in a year, the annual production of cedar cutting seedlings It can be performed.
Of the above methods of the present invention, according to the method (2) and the method including the method (3), not only can the annual production of cedar seedlings be performed more efficiently, but also the leveling of work. Is also achieved.
Among the above methods of the present invention, the low-temperature treatment performed on the cedar ears after harvesting is low-temperature treatment by cutting or cutting by cold insertion in the cold place of the harvested ear or by winter insertion. The method further comprising changing the low-temperature-treated ear into a container in summer and subjecting it to growth in a temperature-controlled facility further increases the annual production of cedar seedlings by winter insertion and summer insertion. Can be done efficiently.

It is the figure which showed typically the example of the cropping shape inserted in a container in summer, and the cropping shape inserted in winter. It is a figure which shows the example of an annual manufacturing cycle in the case of supplying a cedar cutting seedling seedling supply 3 times a year. In the figure, “nursing seedling pattern 1” is a normal seedling raising method in which what is picked at an appropriate time is inserted as an insertion ear. "Seedling pattern 2" is a seedling that promotes rooting and grows under the heating conditions suitable for rooting in the facility for the cuttings that are picked and inserted earlier than usual (January to February) It is a method. “Seedling pattern 3” is picked at a time earlier than usual (January to February), refrigerated storage of the picked ear, and the temperature is adjusted at a time when insertion is not performed conventionally. It is a seedling raising method to insert and grow. It is a photograph figure which shows the panicle which the half of the whole panty used in Example 1 colored in autumn. FIG. 3 is a photographic diagram showing a spike used as a control plot in Example 1.

In the present specification, the term “cutting ear” is used to mean a twig portion containing a spike separated from a cedar mother tree for the purpose of raising seedlings.
In the present specification, the terms “autumn cutting” and “winter cutting” mean cutting in autumn and cutting in winter, which are the usual meanings in this technical field. Autumn and winter mean approximately October to November and approximately December to February, respectively, and different interpretations are possible in view of regional climate and year-to-year variations and the effects of the present invention. For example, during the period from late November to early December, there are regions / years that are interpreted as autumn and regions / years that are interpreted as winter.
In this specification, the words “cutting” and “inserting” are used synonymously, and both mean the process of planting cuttings.

The present invention is a method of producing a cedar seedling by growing the cedar ear in a temperature-controlled facility after being inserted, and using the cedar ear as a cedar seedling. This is a method for producing a cedar seedling that is picked in autumn or winter and subjected to a low-temperature treatment before the insertion.
Under low temperatures from autumn to winter, many plants increase the amount of carbohydrates such as sugar to increase the osmotic pressure in the body so that they do not freeze, and the increase in the amount of carbohydrates such as sugar increases the rooting rate. It has been reported. Although not wishing to be bound by theory, there is a possibility that a mechanism similar to this phenomenon is one of the factors that exert the effect of the present invention in the cuttings of cedar.

  Patent Document 3 discloses that an oleander, an evergreen tree, is cured by maintaining the temperature of the atmosphere in which cutting leaves are exposed at a temperature lower than the curing water (0 to 20 ° C.). A method is disclosed. However, the ears used in the method are not harvested in autumn or winter. No teaching is given in Patent Documents 1 to 2 and 4 and Non-Patent Document 1 regarding the use of spikelets collected in autumn or winter. Moreover, these documents do not describe cedar as an object of cutting.

Non-Patent Document 2 discloses a method for raising a cedar seedling, which is obtained by picking a 20 cm small cedar spike, which is about half the length of a normal cutting spike, in the autumn and inserting it in the open ground. However, in this method, raising seedlings is not performed in a temperature-controlled facility, but in an open field, and it takes one and a half years to grow seedlings. Moreover, in the method of this invention, the magnitude | size of the cedar spike used is not limited, About 20 cm-about 40 cm may be sufficient.
Therefore, the method of the present invention is a completely different method from the above conventional techniques.

The temperature-controlled facility in the present invention is not limited, and examples thereof include a normal greenhouse, a laboratory, and a temperature-controlled room.
In addition, the temperature in the low-temperature treatment in the present invention is not limited, and the winter temperature in the Kyushu region, which is one of the cedar seedling production areas, is a standard. The temperature of the low temperature treatment is preferably the method of the present invention in which the daily maximum temperature is less than about 15 ° C and the daily minimum temperature is less than about 12 ° C.
In the present invention, the low temperature treatment may be performed twice or more with a state not in the state of the low temperature treatment in between. Further, the period of one low temperature treatment is not limited, and may be appropriately adjusted depending on the temperature of the low temperature treatment. The period of one low temperature treatment is, for example, a period of about 0.5 months or more, and may be a period of 1 month or more or a period of 2 months or more.

In the method of the present invention, the density of the cutting spike is not limited, but the method of the present invention in which the density of the inserted spike is about 150 / m ² or more is preferable for mass production. The density of the spiked ear is more preferably about 200 strains / m ² or more, and most preferably about 240 strains / m ² or more. In the cuttings in a normal open field, the density is only about 100 strains / m ² .
In the method of the present invention, the density of the cutting ears can be increased as described above because the ears to be inserted are subjected to low-temperature treatment, so that the balance between photosynthesis and transpiration is stabilized and rooting power is increased. This is considered to be because it rooted immediately, and even with high density cuttings, there is little withering due to excessive humidity.

In the method of the present invention, the timing of picking ears for cutting is not limited as long as it is autumn or winter. A method of the present invention is preferred in which the low-temperature treatment is performed on the cedar ears before picking on the mother tree, and the cedar ears are picked from December to February after being subjected to the low-temperature treatment. Moreover, the method of the present invention in which the low-temperature treatment is performed on the cedar spikes after harvesting and the harvesting is performed from October to November is also preferable.
The timing for picking the ears to be inserted may be determined based on the time when the cedar ears are colored in an area where the cedar ears are colored. In such an area, the ears may be collected for about one month before and after the autumn leaves are normally started.
The timing of picking may also be judged by the degree of autumn leaves. For example, the ears picked after the autumn leaves may be in a state where about 10% or more of the whole ears are colored.

  Further, in the method of the present invention, in the method in which the low temperature treatment includes a step of exposing the ears before harvesting to a low temperature on the mother tree, the ear may be immediately inserted without being subjected to the low temperature treatment after the harvesting. . In such a method, it is possible to avoid or suppress the labor and cost of performing the low temperature treatment.

Of the methods of the present invention, a method comprising subjecting the harvested ears to refrigeration prior to insertion is preferred. By performing the low temperature treatment, the internal condition of the ear can be made more suitable for rooting. Further, the ears can be stored by the low temperature treatment until the insertion is performed.
Although the method of refrigeration is not limited, refrigeration by a refrigerator or a low temperature chamber is exemplified.

Among the methods of the present invention, the low-temperature treatment is a low-temperature treatment by cutting or cutting in a cold place where the spiked ears are inserted in a cold place in the autumn or winter, and the low-temperature treated ears are put in a container in the summer. Preferably, the method further comprises subjecting to growth in a temperature-controlled facility. The cold place may be an open field.
In this method, after the insertion by autumn or winter insertion, the presence or absence of rooting in the ears was investigated after a predetermined number of days, and the ears that were confirmed not rooted were grown in a temperature-controlled facility. A method comprising attaching is preferred. By this method, it is possible to root a non-rooted ear, which has not been considered to be rooted in the past, with a high yield and thereby grow on a cedar seedling.
The molds to be inserted into the container in the summer are schematically illustrated in FIG. 1 together with the molds to be inserted in the winter. In addition, even in the cropping mold to be inserted in winter, it may be subjected to a low-temperature treatment after picking and before inserting into the container. When the heading time is relatively early (October to November), it is preferable to perform low temperature treatment. Further, in consideration of the annual change in climate, the ears picked in December may be appropriately subjected to low-temperature treatment.

In the method of the present invention, the temperature in the facility may be adjusted to a temperature at which the inserted cedar ears root and grow. In the present invention, a method in which the temperature-controlled temperature is 10 ° C. or higher and / or the average temperature is 20 ° C. or higher and 35 ° C. or lower is preferable. A method in which the night temperature is 15 ° C or higher and / or the average temperature is 25 ° C or higher and 30 ° C or lower is more preferable.
In the method of the present invention, normal conditions can be used for raising seedlings other than the temperature in the facility.

In the method of the present invention, the humidity in the facility is not particularly limited. Among the methods of the present invention, a method in which the humidity is adjusted and the humidity is 60% or more is preferable, and a method in which the relative humidity is 70% or more is more preferable.
In the method of the present invention, other conditions, instruments, and the like can be used in the method for producing a normal cedar cutting seedling using a facility.
In the method of the present invention, the light conditions in the facility are not particularly limited, but a method in which the facility is shielded is preferable in order to suppress photosynthesis and respiratory activity of the cuttings after harvesting. When light shielding is performed, the light shielding rate is preferably 40% or more, and more preferably 50% or more.
Among the methods of the present invention, a method in which the ear growth after insertion is performed in a facility where the humidity condition and the light condition are adjusted in addition to the temperature condition is preferable.

According to the method of the present invention, the work can be dispersed by picking a head from autumn to winter and / or cutting in the summer, where the work has not been performed so far. Sugi seedlings can be produced with high efficiency. In addition, by using the method of the present invention in combination with other methods, it is possible to produce cedar seedlings in larger quantities.
For example, the method of the present invention and the production of cedar seedlings by ordinary spring cutting are combined in one year, and a method of producing a large number of cedar seedlings at the anniversary is mentioned. According to such a large-scale manufacturing method, it is possible to supply cedar seedlings throughout the year.

As a method for manufacturing the mass,
A method in which low-temperature treatment is performed on the cedar ears before harvesting, and the cedar ears are subjected to low-temperature treatment and then picked and inserted in December-February. A method in which the ears are picked from cedar ears and the ears are picked from October to November,
-It is preferable to combine the production of cedar seedlings by normal spring cutting and preceding harvesting. An example of the annual schedule of the mass production method by such a combination is shown in FIG.
Production of cedar seedlings by ordinary spring cutting may be either a method using a facility or a method using an open field without using a facility. A method using a facility is preferable because a larger amount of cedar seedlings can be produced with the leveling of work by shifting the timing of picking.
Among the above methods, the low-temperature treatment performed on the cedar spikes after harvesting is a low-temperature treatment by cutting or by refrigeration by cutting into the cold place of the harvested ear, and the low-temperature treatment was performed More preferably, the method further comprises changing the ears into containers in summer and subjecting the ears to growth in a temperature controlled facility. The above-described method in which the environmental conditions in the facility are adjusted to environmental conditions more suitable for rooting is even more preferable. Such environmental conditions include light conditions and temperature and humidity conditions, and may be adjusted by shading, mist, etc., respectively.

The present invention will be described in more detail by way of examples, but these examples do not limit the present invention in any way.
Example 1
(1) Purpose To confirm the effect of the method of the present invention when using winter ears.
(2) Test method / container A container having a capacity of 200 ml (length 140 mm, upper diameter 52 mm, lower diameter 15 mm) (38 consecutive tree tray made by Nissin Agricultural Industry, trade name: Tray Master) was used. The insertion density was 248 strains / m ² .
-Variety Obiaka was used.
・ Seedling method Winter ears harvested on January 13, 2012 or February 14, 2012 at Hyho-shi in Hyuga City, Miyazaki Prefecture were inserted into containers, and seedlings were raised under sealed conditions in the greenhouse. . The ears harvested on January 13, 2012 were in a state where about half of the whole ears were colored at the time of insertion (FIG. 3A).
In the low temperature period, heating and humidification were performed by a heater and a sealing process. Mist and irrigation were performed appropriately according to the season.
In addition, as a control plot, the head was picked and cut on September 15, 2011, and the seedlings were raised by mist treatment without adjusting the temperature. The ears used in the control group were not colored (FIG. 3B).
-Survey The initial rooting time was confirmed, and the rooting rate and root growth status (underground weight) were investigated as the rooting status 150 days after insertion.
For the control group, the rooting rate and the growth of roots were similarly investigated on the 134th day after insertion.

(3) Test results and discussion The results are summarized in Table 1 below.

For Fuyuho, initial rooting was confirmed 60 days after insertion.
In addition, regarding the rooting situation on the 150th day after insertion, the rooting rate is 88% (January 13 heading zone) and 95% (February 14 heading zone), They were 9.2 g / strain and 6.0 g / strain. In contrast, in the control group, the rooting rate was 63%, and the underground weight was 3.9 g / strain.
From the above results, it was clarified that a cedar seedling can be produced with high efficiency by the method for producing a cedar seedling of the method of the present invention.

(Example 2)
(1) Purpose To confirm the effect of the method of the present invention when Akiho is used.
(2) Test method / container A container with a slit having a capacity of 150 ml and a depth of 150 mm (BCC, trade name: Flexi frame 77) was used. The planting density was 362 strains / m ² .
-Variety Obiaka was used.
・ Nurse raising method The following four production lots were established:

After insertion, the ears were managed in the greenhouse. In the low temperature period, heating and humidification were performed by a heater and a sealing process. Mist and irrigation were performed appropriately according to the season.
In addition, the harvesting was carried out in the harvesting garden in Hyuga City, Miyazaki Prefecture.
・ Survey On the day when the number of days after insertion shown in Table 2 has elapsed, the rooting rate was investigated as the rooting status and the seedling death rate was investigated.

(3) Test results and discussion The results are summarized in Table 3 below.

  In production lot 3 where Akiho (cutting ear picked in autumn) was once inserted into the open ground and then replaced with a container in the summer, there was almost no death even under high temperature conditions in the summer, and the spring ear (production lot 1) The rooting rate was higher. On the other hand, what was inserted in the summer (production lot 2) hardly rooted and could not substantially produce seedlings. In addition, when Akiho was directly inserted into the container (production lot 4), the rooting rate was relatively high, but it was inferior to production lot 3 (Table 3 above). From the above results, according to the method of the present invention, it was confirmed that cedar seedlings can be produced with high efficiency even when Akiho is inserted at a high density. In particular, it was clarified that the rooting situation was further improved by subjecting Akiho to low temperature treatment.

  According to the present invention, it is possible to increase the production efficiency of cedar cutting seedlings as compared with the conventional method, and leveling of work is achieved. Therefore, the present invention greatly contributes to the development of the cedar cutting seedling production industry and related industries.

Claims (12)

  A method for producing a cedar seedling by growing the cedar ear in a temperature-controlled facility after being inserted and using the cedar ear as a cedar seedling, wherein the cedar ear is fall or winter A method for producing a cedar seedling, which is a spike that has been picked in the head and subjected to a low-temperature treatment before the insertion.   The method according to claim 1, wherein the low-temperature treatment is performed on cedar spikes before picking, and the cedar spikes are picked and inserted in December to February after being subjected to the low-temperature treatment.   The method according to claim 1, wherein the low-temperature treatment is performed on cedar spikes after harvesting, and the harvesting is performed in October to November.   The method according to any one of claims 1 to 3, wherein the ears of cedar after harvesting are subjected to refrigeration.   The method according to any one of claims 1 to 4, wherein the low temperature treatment includes a step of exposing the ears before harvesting to a low temperature on the mother tree.   The low-temperature treatment is low-temperature treatment by cutting or cutting in the autumn or winter cutting of the collected ears, and the low-temperature treatment is carried out by changing the temperature of the spiked ears into a container in the summer and adjusting the temperature. 4. The method according to claim 2 or 3, further comprising subjecting to growth in a designated facility.   The growth in the temperature-controlled facility is carried out in autumn or winter, and the temperature-controlled temperature in the facility is a night temperature of 10 ° C or higher and / or an average temperature of 20 ° C or higher and 35 ° C or lower. The method in any one of 1-6.   Furthermore, the humidity in a plant | facility is adjusted, The method in any one of Claims 1-7 whose said humidity is 60% or more of relative humidity. The method according to any one of claims 1 to 8, wherein the cuttings are made so that the density of the spikes is 150 / m ² or more.   A method for producing a large number of cedar seedlings in a year by combining the method according to any one of claims 1 to 9 and the production of cedar seedlings by ordinary spring insertion during one year.   The method of claim 10, comprising the method of claim 2 and the method of claim 3.   The low-temperature treatment performed on the cedar ears after harvesting is a low-temperature treatment by cutting or cutting in the autumn or winter cutting of the harvested ears at a low-temperature location. 12. The method of claim 11, further comprising changing the container to a container in summer and subjecting it to growth in a temperature controlled facility.