WO2014132461A1 - 根圏温度制御によるトルコギキョウの葉先枯れ症抑制方法 - Google Patents

根圏温度制御によるトルコギキョウの葉先枯れ症抑制方法 Download PDF

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WO2014132461A1
WO2014132461A1 PCT/JP2013/069990 JP2013069990W WO2014132461A1 WO 2014132461 A1 WO2014132461 A1 WO 2014132461A1 JP 2013069990 W JP2013069990 W JP 2013069990W WO 2014132461 A1 WO2014132461 A1 WO 2014132461A1
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temperature
rhizosphere
eustoma
growth
leaf blight
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PCT/JP2013/069990
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English (en)
French (fr)
Japanese (ja)
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直子 福田
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独立行政法人農業・食品産業技術総合研究機構
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00—Botany in general
    • A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00—Cultivation of specific crops or plants not otherwise provided for
    • A01G22/60—Flowers; Ornamental plants

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  • the present invention relates to a method for efficiently suppressing leaf blight disease by controlling the rhizosphere temperature of a plant of the genus Eustoma (Eustoma grandiflorum).
  • the present invention also relates to a method for efficiently cultivating high-quality eustoma by using the above method.
  • Eustoma also known as Eustoma, Lithiansus
  • Eustoma leaf blight disease
  • eustoma is a plant that is encouraged to flower under long-day conditions in the natural state and blooms in spring. Therefore, it is relatively easy to produce high quality eustoma in spring.
  • autumn to winter is not the flowering period of eustoma. For this reason, high quality cut flowers for wedding work are required for autumnal eustoma and high economic efficiency is expected.
  • leaf blight Chipburn
  • Leaf blight was considered a physiological disorder that occurs when calcium is deficient during flower bud differentiation. Therefore, a method of spraying calcium material on the leaf surface during or before the occurrence of leaf blight has been performed (for example, see Non-Patent Document 1).
  • this method since it is necessary to apply calcium material to a plant individual with the possibility of leaf blight disease every week for a certain period of time, the leaf tips of all individuals cultivated in principle. It was a difficult method to control withering. Further, in addition to the high material cost, it is necessary to spray calcium at a high concentration, so that a problem in terms of cost has been pointed out. It was also a method of imposing a lot of effort on growers who spray. For this reason, this method has not been recognized as a practically useful method for suppressing leaf blight disease in producers.
  • leaf blight is considered to occur because the growth rate of the above-ground part is too fast due to high temperature conditions, and the calcium concentration is relatively insufficient in sites with high physiological activity such as new leaves and growth points. It was. Therefore, paying attention to the mechanism, techniques have been tried to reduce leaf wilt by intentionally suppressing growth by reducing the amount of irrigation or applying a certain amount of wind to the above-ground part (for example, , See Patent Document 1).
  • these suppression techniques are techniques that include disadvantages that adversely affect quality and harvest efficiency, such as a reduction in growth amount and a longer period for harvesting in principle.
  • the present invention is a technology that can be applied simultaneously to all individuals cultivated in the environment where leaf blight occurs, without using drugs or the like, It aims at providing the technique which can suppress leaf-tip blight disease remarkably at low cost.
  • the present inventor has cultivated Eustoma (Eustoma) in an environment where leaf blight occurs and controls the rhizosphere temperature in the flower bud differentiation stage. It has been found that leaf tip blight can be remarkably suppressed by maintaining the rhizosphere temperature at a low temperature within a predetermined range.
  • the present invention is a rhizosphere low temperature which maintains the rhizosphere temperature in the flower bud differentiation stage substantially at 10 to 20 ° C. when cultivating the plant of the genus Eustoma under the condition where the temperature exceeds 20 ° C.
  • the present invention relates to a method for suppressing leaf blight in Eustoma plants, characterized by performing treatment.
  • the present invention according to [Claim 2] relates to a method for suppressing leaf blight disease according to claim 1, wherein the low-temperature rhizosphere treatment is carried out for 14 days or more after the plant height reaches 7 to 20 cm. It is.
  • the present invention according to [Claim 3] relates to a method for inhibiting leaf blight disease according to claim 2, wherein the rhizosphere low-temperature treatment is performed within 36 days.
  • the present invention according to [Claim 4] is the leaf tip wilt according to any one of Claims 1 to 3, wherein the rhizosphere low-temperature treatment substantially maintains the rhizosphere temperature at 13 to 20 ° C.
  • the present invention relates to a method for suppressing the disease.
  • the present invention according to [Claim 5] is characterized in that the rhizosphere temperature from the seedling planting to the rhizosphere low-temperature treatment is substantially maintained at 23 to 32 ° C. The method for suppressing leaf blight of any of the above.
  • the present invention according to [Claim 6] is characterized in that the rhizosphere temperature after the rhizosphere low-temperature treatment is substantially maintained at 18 to 28 ° C. It relates to a suppression method.
  • the maintenance of the rhizosphere temperature is controlled by adjusting the water temperature of the nutrient solution in hydroponics or hydroponics.
  • the present invention relates to a method for suppressing leaf blight.
  • the present invention according to [Claim 8] relates to a method for inhibiting leaf tip blight according to any one of claims 1 to 7, wherein the Eustoma plant is Eustoma grandiflorum.
  • the present invention according to [Claim 9] relates to a method for cultivating a plant belonging to the genus Eustoma, characterized in that leaf blight is suppressed using the method according to any one of Claims 1 to 8.
  • the present invention according to [Claim 10] obtains a germinated or flowering plant body in which leaf blight is suppressed by cultivation using the method according to claim 9, and is planted in a container filled with soil.
  • the present invention relates to a method for producing a container-planted Eustoma plant, which is characterized in that
  • the present invention according to [Claim 11] obtains a germination or flowering plant body in which leaf blight has been suppressed by cultivating using the method according to claim 9, and includes a flower stem or a flower stem. It is related with the production method of the cut flower of the Eustoma genus plant characterized by cutting and harvesting.
  • the present invention according to [Claim 12] relates to a method for producing a processed cut flower product, characterized in that the cut flower produced by the method according to Claim 11 is used.
  • the present invention makes it possible to provide a technique capable of significantly suppressing the occurrence of leaf tip blight disease when cultivating a plant belonging to the genus Eustoma (Eustoma grandiflorum) in an environment where leaf blight disease occurs.
  • the present invention is a technique that can be applied to all cultivated individuals at the same time, and is a technique that suppresses leaf tip blight at a low cost without using a drug or the like.
  • the present invention makes it possible to efficiently cultivate high-quality eustoma even in an environment where leaf blight is likely to occur.
  • the present invention makes it possible to efficiently produce cut flowers and container plants of eustoma which are highly economical.
  • Example 1 In the growth test in Example 1, it is the result figure which calculated and showed the appearance frequency (%) of the leaf blight occurrence individual in each treatment section.
  • the photograph image figure which imaged the grass figure of the average individual in rhizosphere temperature of 28 ° C (treatment section 1-3) and rhizosphere temperature of 15 ° C (treatment section 1-4).
  • 2 is a photographic image obtained by photographing the tip of a core withered individual in a growth test in Example 1.
  • FIG. FIG. 6 is a photographic image obtained by photographing the average individual grass in each treatment section in the growth test in Example 4.
  • the bar in the figure indicates 10 cm.
  • it is the figure which showed the one aspect
  • the present invention significantly suppresses the occurrence of leaf blight disease by maintaining the rhizosphere temperature in the flower bud differentiation stage at a low temperature within a predetermined range when cultivating Eustoma plants in an environment where leaf blight disease occurs.
  • the present invention relates to a method for significantly suppressing the occurrence of leaf blight of Eustoma plants.
  • Eustoma is an annual herb belonging to the Gentian family, and two wild species are known, E. grandiflorum (Eustoma grandiflorum) and E. exaltatum (Eustoma exaltatum). Distributed from the north of the Americas to the north of Mexico. All species have the property of overwintering in the rosette state in the natural state, and flowering is promoted in the spring to early summer under the condition of long days.
  • E. grandiflorum is a plant known in Japan as Eustoma grandiflorum (Japanese name: Eustoma grandiflorum, also known as: Lisianthus, Eustoma), and there are many varieties that have high economic value as flower production and horticultural plants. It is a plant suitable as an application target of the present invention.
  • the present invention is a technique that can be applied to any variety of eustoma.
  • eustoma varieties include, for example, Voyage Pink, Reina White, Picco Rosa Snow, Celebrity Pink, Bolero White, Colezolite Pink, Mink, Snow Temari, Maria White, Engage Yellow, Mai Teledy, Porous White, etc. it can.
  • the present invention is particularly useful for varieties (such as Voyage Pink) that are susceptible to leaf blight.
  • the cultivation of Eustoma plants in the present invention can be divided into early growth and late growth depending on the growth stage (see FIG. 5).
  • the germinated seedlings are in a pair of 2 to 3 true leaves with little internode growth (overwinter in this state in the natural state). Thereafter, the seedlings grow and extract internode cells under high temperature and long day conditions, the plant height reaches a predetermined size, and flower bud differentiation occurs. Differentiated flower buds will flower after flowering.
  • “initial growth” refers to growth in the vegetative growth period until the first flower bud enters the flower bud differentiation stage.
  • “Late growth” refers to the growth stage after the first flower bud enters the flower bud differentiation stage. That is, it refers to the period of the latter half of the cultivation that combines the flower bud differentiation period, the bud stage, and the flowering period.
  • the rhizosphere low-temperature treatment in the present invention is a treatment applied in a part or all of the late growth period.
  • the means for controlling the rhizosphere temperature includes (A) means for adjusting and controlling the nutrient solution water temperature, (B) means for controlling by providing a temperature control mechanism under the solid support, and the like. Can do.
  • the means described in (A) can be used from the viewpoint that the temperature can be easily equalized even in large-scale cultivation, and the equipment is low in cost. It is preferable to adopt. In particular, it is suitable to employ hydroponics, most preferably an NFT hydroponic system.
  • a means for adjusting the nutrient water temperature by hydroponics can be mentioned.
  • a mode in which the plant is planted on a support such as expanded polystyrene, rock wool, non-woven fabric, vermiculite, sand, or ceramic can be employed.
  • hydroponics it is preferable to employ a method of circulating the nutrient solution. In this method, uniform water temperature control can be easily performed, and a large number of plant individuals can be cultivated simultaneously.
  • an underwater pump, an air lift using an air pump, or the like can be adopted.
  • an NFT hydroponic system is a water system in which the culture solution is poured from above a slightly sloped bed called a channel, the nutrient solution that has fallen is temporarily stored in a tank, pumped up and circulated again. It refers to the cultivation system.
  • hydroponics the method of putting a nutrient solution on a tank, a water tank, a container, etc., and hydroponically cultivating it in a flooded state can also be adopted.
  • the submerged hydroponics is a method that can be sufficiently employed because the temperature is unlikely to be uneven when the cultivation scale is small.
  • the soil is filled in a container (vinyl pot, pot, planter, etc.) having a drain hole, plants are planted in the soil, and the soil is immersed in a nutrient solution for cultivation. It is also possible to adopt a mode of performing. In this aspect, either a circulation method or a flooding method can be adopted.
  • any nutrient solution can be used as long as it can be used for hydroponics and hydroponics of a common Eustoma plant (Eustoma grandiflorum). It is preferable to use a nutrient solution having a low nitrogen concentration, specifically 2.0 mM or less, preferably 1.5 mM or less, more preferably 1.0 mM or less, and more preferably 0.8 mM or less.
  • the lower limit of the nitrogen concentration is preferably 0.1 mM or more, preferably 0.2 mM or more, more preferably 0.3 mM or more so as to ensure the growth amount.
  • a thermal heater or the like for example, a means for controlling the rhizosphere temperature by installing a thermal heater or the like under the solid support.
  • Specific examples of the solid support here include soil, vermiculite, and sand. This method can be applied when the cultivation scale is small. However, when the scale is large, it is recognized that it is difficult to maintain the temperature uniformly.
  • leaf tip blight can be remarkably suppressed by controlling the rhizosphere temperature to maintain the rhizosphere temperature in the flower bud differentiation stage at a low temperature within a predetermined range.
  • 'leaf-withering disease' also known as tipburn
  • tipburn means that new leaves and growth points die out due to a relative lack of calcium concentration in highly physiological sites such as new leaves and growth points. It refers to physiological disorders.
  • it can be divided into (i) a state where the tip of the leaf is slightly dead (withered tip), and (ii) a state where the tip of the main stem is withered (withered).
  • the environmental condition where leaf blight occurs is a temperature condition exceeding 20 ° C.
  • the leaf blight disease tends to increase in frequency and become more severe as the temperature increases.
  • the frequency of occurrence increases drastically and the onset degree becomes severe.
  • the high humidity conditions include a relative humidity of 70% or more, particularly 80% or more, more particularly 90% or more, and more particularly 95% or more.
  • the high nitrogen condition refers to, for example, a condition for cultivation using a nutrient solution or liquid fertilizer having a total nitrogen concentration of 5 mM or more, preferably 7 mM or more, more preferably 9 mM or more. The higher the nitrogen concentration, the more frequently the leaf blight occurs and the severity of the onset.
  • leaf blight occurs on the temperature condition exceeding 20 ° C., and the occurrence thereof is further promoted by the high temperature condition, the high humidity condition, and the high nitrogen condition. Moreover, when these conditions overlap, it becomes easy to occur frequently synergistically, and the onset degree also becomes severe.
  • An example of an environment in which leaf blight is likely to occur frequently is an environment in which a large amount of fertilizer is applied in a summer greenhouse.
  • the rhizosphere low-temperature treatment of the present invention is a technique characterized in that it is performed so as to cover the flower bud differentiation stage.
  • the 'flower bud differentiation period' refers to the period from when buds change from vegetative growth to reproductive growth and the first flower buds begin to form and to just before germination (see Figure 5).
  • the term flower bud differentiation stage here is a term that refers to the growth stage that is judged on an individual basis, not on a flower bud basis. As an index of whether the vegetatively growing individual has entered the flower bud differentiation stage, it cannot be directly judged from the appearance of the cultivation state.
  • the determination can be made at the time when the expression level of a flower bud forming gene such as FT (Flowering Locus T) gene, LFY (LEAFY) gene, AP1 (APETALA1) gene increases.
  • FT Flowering Locus T
  • LFY LEAFY
  • AP1 APETALA1
  • reproductive organs such as ovules and pupae are formed at the stage after reaching the stage of germination.
  • the period from the start of flower bud differentiation to the emergence is about 10 to 21 days, and under normal cultivation conditions is about 12 to 18 days.
  • the rhizosphere low-temperature treatment should be substantially maintained in the temperature range of 10 to 20 ° C.
  • the rhizosphere temperature in the treatment needs to be 20 ° C. or lower. Preferably it is 19 degrees C or less, More preferably, 18 degrees C or less can be mentioned.
  • the rhizosphere temperature is too high, the frequency of occurrence of leaf withering increases, and the symptoms tend to become severe. That is, it is not preferable because a sufficient effect of suppressing leaf blight can not be expected.
  • the lower limit temperature of the treatment temperature can be 10 ° C. or higher.
  • the rhizosphere low-temperature treatment is preferably performed at 13 to 20 ° C., more preferably at 15 to 20 ° C., and most preferably at 15 to 18 ° C.
  • substantially maintaining does not mean that the temperature zone is not completely deviated from, for example, a certain temperature range (for example, within 2 ° C., preferably within 1 ° C. ), Within 2 days, preferably within 1 day, it means that the conditions for maintaining the temperature range are satisfied.
  • the upper limit of the plant height is 20 cm or less, preferably 18 cm or less, more preferably 16 cm or less, more preferably 14 cm or less, further preferably 12 cm or less, more preferably 11 cm or less, and further preferably 10 cm or less. Is preferred.
  • the treatment start time tends to be too late. That is, it is not preferable because all or part of the plant individual enters the flower bud differentiation stage, and the occurrence of leaf tip blight can not be sufficiently suppressed.
  • flower bud differentiation tends to occur early, it is preferably 12 cm or less, more preferably 11 cm or less, and even more preferably 10 cm or less.
  • the lower limit of the plant height is 7 cm or more, preferably 8 cm or more.
  • the plant height can be obtained by measuring the length from the base of the above-ground part (between the stem and the root) to the tip where the plant body naturally grows.
  • an average value calculated by sampling can be adopted as a determination index for the entire group instead of a value for each individual.
  • the period for performing rhizosphere low-temperature treatment in the present invention needs to include a period from the time when the first flower buds are differentiated to the time of germination.
  • the first flower buds are differentiated, the second and subsequent flower buds are also continuously generated.
  • the plant body in the period from the first flower bud differentiation to the germination (flower bud differentiation stage) is in a growth stage where the growth is switched from vegetative growth to reproductive growth. Therefore, it is presumed that the physiological disorder causing the leaf blight can be avoided by performing the rhizosphere low-temperature treatment so as to cover the period.
  • the period for performing the rhizosphere low-temperature treatment in the present invention is 14 days or more from the start of the treatment, preferably 16 days or more, more preferably 18 days or more, more preferably 20 days or more, more preferably 21 days or more. It is preferable to carry out. By performing the treatment over this period, it becomes possible to perform rhizosphere low temperature treatment including the period from the time when the first flower bud differentiates to the time of germination, and remarkably suppress the occurrence of leaf blight It becomes possible.
  • the period of the rhizosphere low-temperature treatment when the period of the rhizosphere low-temperature treatment is too long, the influence of growth inhibition (yellowing of leaves, hatching) due to low temperature becomes prominent and there is a tendency for individuals with low commercial value to increase. Therefore, within 36 days from the start of the rhizosphere low temperature treatment, preferably within 34 days, more preferably within 32 days, more preferably within 30 days, more preferably within 28 days, more preferably within 24 days. It is desirable to terminate. In particular, when the rhizosphere low-temperature treatment is performed at less than 18 ° C., the influence of growth suppression due to low temperature tends to increase, so it is particularly important to consider the upper limit of the period. In addition, after the rhizosphere low-temperature treatment at less than 18 ° C, it is desirable to cultivate the rhizosphere at a temperature of 18 ° C or higher to recover the growth.
  • the present invention by performing cultivation in the rhizosphere temperature zone at medium and high temperatures for the 'initial growth period' and / or 'late growth period after rhizosphere low temperature treatment', the growth amount and the growth rate are further improved. It becomes possible. That is, the production efficiency can be further improved.
  • the present invention even when the rhizosphere temperature is out of the following predetermined temperature range during the growth of these periods, although a tendency to decrease the production efficiency is recognized, high-quality Eustoma plants are efficiently produced. It is fully possible to do. That is, the present invention does not exclude a mode in which the rhizosphere temperature is cultivated outside the following predetermined temperature range in the growth during these periods.
  • cultivation may be carried out while maintaining the rhizosphere temperature of the initial growth (specifically, from planting of seedlings to performing the rhizosphere low-temperature treatment) substantially at 23 to 32 ° C. preferable.
  • the rhizosphere temperature is preferably 23 ° C. or higher, preferably 25 ° C. or higher, more preferably 27 ° C. or higher, more preferably 28 ° C. or higher, more preferably 29 ° C. or higher.
  • the upper limit temperature of the rhizosphere temperature is 32 ° C.
  • substantially maintaining does not mean that the temperature zone is not completely deviated from, for example, a certain temperature range (for example, within 2 ° C., preferably within 1 ° C. ), Within 2 days, preferably within 1 day, it means that the conditions for maintaining the temperature range are satisfied.
  • the rhizosphere temperature of late growth after low-temperature rhizosphere treatment is 18 ° C. or higher, preferably 20 ° C. or higher, more preferably 23 ° C. or higher, more preferably 24 ° C. or higher.
  • the upper limit temperature of the rhizosphere temperature is 28 ° C.
  • substantially maintaining does not mean that the temperature zone is not completely deviated from, for example, a certain temperature range (for example, within 2 ° C., preferably within 1 ° C. ), Within 2 days, preferably within 1 day, it means that the conditions for maintaining the temperature range are satisfied.
  • the present invention by performing cultivation in the rhizosphere temperature zone at medium and high temperatures for the 'initial growth period' and / or 'late growth period after rhizosphere low-temperature treatment' in the present invention, It is possible to improve the growth amount and the growth rate. That is, it is possible to obtain the effect of offsetting the growth suppression in the rhizosphere low-temperature treatment.
  • the rhizosphere low-temperature treatment is performed at a low temperature of less than 18 ° C., it is recognized as suitable cultivation conditions.
  • growth in the middle and high temperature rhizosphere temperature zone can be further improved.
  • Examples of 'container planting' include a form that has been planted in a container filled with soil (for example, a flower pot, a vinyl pot, a planter, etc.). Also included here are those in the state of group planting.
  • the container planting may be a final product by obtaining a plant body that has entered the flowering or flowering period by performing rhizosphere low-temperature treatment as described above, and planting the plant body in a soil-filled container. it can.
  • the rhizosphere low-temperature treatment is performed in a state where the plant is planted in the container
  • the final product can be obtained in a state where the plant body enters the germination or flowering period.
  • the product is preferably in the form of a flower stalk with one flower and one bud per flower stalk.
  • the end product is obtained by performing rhizosphere low-temperature treatment as described above to obtain a plant that has entered the flowering or flowering stage, and cutting and harvesting the flower stem or the above-ground part including the flower stem. It can be made the form. This includes bouquets and bouquets. Most desirable is a flower stalk with one flower and one bud per flower stalk.
  • the “cut flower processed product” refers to a product obtained by chemically treating the cut flower (chemical treatment, drying treatment, etc.) so that the form, pigment, and the like are not deteriorated. Specifically, a preserved flower can be mentioned.
  • the processing method for producing a cut flower processed product can be performed by a conventional method.
  • Example 1 “Effect of rhizosphere temperature on the occurrence of leaf blight” It is known that high temperature conditions and high fertilization conditions promote the occurrence of leaf blight in the cultivation of Eustoma grandiflorum. Therefore, we investigated the effect of rhizosphere temperature on the occurrence of leaf blight in the growth of Eustoma after flower bud differentiation.
  • High Temp Ar (Sumitomo Chemical Co., Ltd.) is composed of nitrate nitrogen (N) 7.3%, water-soluble potassium (K 2 O) 3%, water-soluble magnesium 2.3%, water-soluble manganese 0.03%, water-soluble boron 0.05% It is liquid fertilizer containing.
  • High Tempo Cu (Sumitomo Chemical Co., Ltd.) is a liquid fertilizer containing nitrogen (N) 7.3%, water-soluble phosphorus (P 2 O 5 ) 4.5%, water-soluble potassium (K 2 O) 6.5%.
  • the water temperature of the nutrient solution was set to 28 ° C., and the cultivated seedlings were planted on a styrofoam plate by 20 seedlings and placed on the water tank surface.
  • FIG. 2 shows the average plant shape of the average individuals in the section treated with a rhizosphere temperature of 28 ° C (treated section 1-3) and the section treated with a rhizosphere temperature of 15 ° C (treated section 1-4).
  • the individual grasses were contrasted and shown as a photographic image.
  • the top buds died due to the anchoring of the core.
  • the apical buds grew normally and became a normal beautiful grass (see the upper row of Fig. 2).
  • Example 2 “Effective rhizosphere temperature range for controlling leaf blight” We examined the effective rhizosphere temperature range for controlling leaf blight in the growth of Eustoma after flower bud differentiation.
  • Example 3 “Effect of rhizosphere temperature on initial growth” In the cultivation of Eustoma grandiflorum, the effect of rhizosphere temperature on initial growth was examined.
  • the temperature condition of 6 to 18:00 is 30 ° C and 17 to 7:00 is 25 ° C, the humidity is natural, the rhizosphere temperature (the nutrient solution temperature) is shown in Table 3, Hydroponic cultivation in a flooded environment was performed for 23 days under the conditions of;
  • Example 4 “Effect of rhizosphere temperature on growth after flower bud differentiation stage” In the cultivation of Eustoma grandiflorum, the effect of rhizosphere temperature on the growth after the flower bud differentiation stage was examined.
  • Fig. 4 shows the rhizosphere temperature after the flower bud differentiation period of 15 ° C (treatment zone 4-1), rhizosphere temperature of 20 ° C (treatment zone 4-2), rhizosphere temperature of 25 ° C (treatment zone 4-3), and rhizosphere temperature.
  • the average figure of the grass in the growth at 30 ° C (treatment section 4-4) was compared and shown as a photographic image.
  • the leaf blight is suppressed by maintaining the rhizosphere temperature around 20-25 ° C (18-28 ° C considering the boundary temperature ⁇ ). While increasing the growth of foliage and roots, it was shown to be suitable.
  • the state of the stock at the time of harvest was leaf tip blight when the rhizosphere temperature was 20 ° C (implementation zone) for 3 weeks after the flower bud differentiation stage than when the rhizosphere temperature was 30 ° C (control zone).
  • the number of outbreaks was less than half, and the degree of onset was slight.
  • the flower weight and the number of flowers were significantly increased, and it was confirmed that the cut flower traits were greatly improved.
  • the present invention makes it possible to efficiently cultivate high-quality eustoma even at a time when leaf tip blight is likely to occur. Therefore, it is possible to efficiently produce cut flowers and container plants of eustoma which are highly economical. Therefore, the present invention is expected to be a technique that can be used extremely effectively for growers in the field of eustoma cultivation.

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PCT/JP2013/069990 2013-03-01 2013-07-24 根圏温度制御によるトルコギキョウの葉先枯れ症抑制方法 WO2014132461A1 (ja)

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