JP5754837B2 - Method for drying coated granulated seeds - Google Patents
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本発明は被覆造粒種子の乾燥方法に関するものである。 The present invention relates to a method for drying coated granulated seeds.
種子を利用する分野において播種作業を省力化し、少ない労働力で大規模な作業をするために多様な形状をした種子を一定の形状や特定の重量に被覆造粒する技術、すなわち種子コーティングがますます重要となってきている。とりわけ、農業生産においては効率的でかつ、計画的な栽培を行うための高性能な種子が要求されている。その一つとして、被覆造粒化によって発芽性能の低下しない被覆造粒種子が求められている。そのためには、被覆造粒後の乾燥行程における乾燥不足を防止することが重要である。 In the field of seed utilization, there is a technology to save seeding work and to granulate seeds with various shapes to a certain shape and specific weight in order to perform large-scale work with a small labor force, that is, seed coating It has become increasingly important. Especially in agricultural production, efficient and high-performance seeds for planned cultivation are required. As one of them, there is a demand for coated granulated seeds whose germination performance is not lowered by the coating granulation. For that purpose, it is important to prevent insufficient drying in the drying process after coating granulation.
そこで、これまで被覆造粒種子の乾燥方法に関して種々の提案がなされている。例えば特許文献１では、被覆造粒種子を振動又は転動させながら所定温度以上の熱風を被覆造粒種子に接触通過させる乾燥方法が提案されている。また特許文献２では、乾燥温度を変えて２段階で乾燥を行う方法が提案されている。 Thus, various proposals have been made regarding the drying method of coated granulated seeds. For example, Patent Document 1 proposes a drying method in which hot air having a predetermined temperature or more is brought into contact with and passed through the coated granulated seed while vibrating or rolling the coated granulated seed. Patent Document 2 proposes a method of performing drying in two stages by changing the drying temperature.
ところが、乾燥工程における供給空気を所定温度に制御していても、被覆造粒種子を乾燥させる時季や場所などによって、被覆造粒種子の性能に差が生じることがあり、被覆造粒種子の性能差を小さくする乾燥方法が求められていた。 However, even if the supply air in the drying process is controlled to a predetermined temperature, the performance of the coated granulated seed may vary depending on the season and place where the coated granulated seed is dried. There has been a need for a drying method that reduces the difference.
このような状況下で本発明者らは鋭意検討を行った結果、被覆造粒種子の乾燥処理において供給空気の温度のみならず供給空気の湿度も被覆造粒種子の性能に影響を与えるとの知見を得、本発明を完成させた。すなわち、本発明に係る被覆造粒種子の乾燥方法は、水分を含有する被覆造粒種子を、絶対湿度が１４g／ｋｇ（ＤＡ：Dry Air）以下、温度が５０℃未満の供給空気で乾燥させる第１工程と、第１工程によって得られた被覆造粒種子を温度５０℃以下の供給空気でさらに乾燥させる第２工程とを有することを特徴とする。 Under such circumstances, the present inventors have conducted intensive studies and found that not only the temperature of the supply air but also the humidity of the supply air affects the performance of the coated granulated seed in the drying treatment of the coated granulated seed. Knowledge was obtained and the present invention was completed. That is, in the method for drying a coated granulated seed according to the present invention, the coated granulated seed containing moisture is dried with supply air having an absolute humidity of 14 g / kg (DA: Dry Air) or less and a temperature of less than 50 ° C. It has a 1st process and the 2nd process of further drying the coated granulated seed obtained by the 1st process with the supply air of temperature 50 degrees C or less.
また、第１工程において被覆造粒種子の限界含水率近傍まで被覆造粒種子を乾燥させるのが好ましい。 Moreover, it is preferable to dry the coated granulated seed to the vicinity of the limit moisture content of the coated granulated seed in the first step.
そしてまた、第２工程において被覆造粒種子の平衡含水率近傍まで被覆造粒種子を乾燥させるのが好ましい。 Moreover, it is preferable to dry the coated granulated seed to the vicinity of the equilibrium moisture content of the coated granulated seed in the second step.
また、本発明によれば、前記記載の乾燥方法によって乾燥されたことを特徴とする被覆造粒種子が提供される。 Moreover, according to this invention, the coated granulated seed characterized by having been dried by the said drying method is provided.
なお、本明細書において「限界含水率」とは、被覆造粒種子の定率乾燥期間と減率乾燥期間の境界における含水率をいい、「平衡含水率」とは、無限時間乾燥後に到達する含水率をいう。これらの値はあらかじめ水分を含有した被覆造粒種子を所定の供給空気温度にて乾燥させながら、一定時間毎に被覆造粒種子の表面温度又は含水率を測定することによって知ることができる。すなわち、図１に示すように、縦軸を含水率又は種子温度とし、横軸を乾燥時間としてグラフを作製したとき、定率乾燥期間IIから減率乾燥期間IIIに移るときの含水率が「限界含水率」であり、十分に乾燥した状態の含水率が「平衡含水率」である。 In this specification, the “marginal moisture content” refers to the moisture content at the boundary between the constant rate drying period and the reduced rate drying period of the coated granulated seed, and the “equilibrium moisture content” refers to the moisture content reached after infinite time drying. Say rate. These values can be known by measuring the surface temperature or moisture content of the coated granulated seed at regular intervals while drying the coated granulated seed previously containing moisture at a predetermined supply air temperature. That is, as shown in FIG. 1, when the graph is made with the water content or seed temperature on the vertical axis and the drying time on the horizontal axis, the water content when moving from the constant rate drying period II to the decreasing rate drying period III is “limit”. The water content is a “water content”, and the water content in a sufficiently dry state is the “equilibrium water content”.
また、本明細書において「限界含水率近傍」とは、「１．２５×限界含水率」以下を意味し、「平衡含水率近傍」とは、「（１±０．１）×平衡含水率」の範囲を意味するものとする。 In the present specification, “near limit water content” means “1.25 × limit water content” or less, and “near equilibrium water content” means “(1 ± 0.1) × equilibrium water content”. ”.
本発明の乾燥方法によれば、乾燥させる時季や場所などによらず、発芽性能を劣化させずに被覆造粒種子を乾燥させることができる。 According to the drying method of the present invention, the coated granulated seed can be dried without deteriorating germination performance regardless of the season and place of drying.
本発明に係る乾燥方法の大きな特徴は、乾燥工程を第１工程と第２工程とに分け、第１工程では、絶対湿度の低い供給空気で被覆造粒種子を乾燥させ、そして第２工程では、温度の低い供給空気で被覆造粒種子を乾燥させることにある。これにより、種子の発芽性能を劣化させることなく種子の乾燥を行うことができる。以下、各工程について順に説明する。 A major feature of the drying method according to the present invention is that the drying step is divided into a first step and a second step, and in the first step, the coated granulated seed is dried with supply air having a low absolute humidity, and in the second step, It is to dry the coated granulated seed with a low temperature supply air. Thereby, the seed can be dried without deteriorating the germination performance of the seed. Hereinafter, each process is demonstrated in order.
第１工程では、供給空気の絶対湿度を１４ｇ／ｋｇ（ＤＡ）以下とすることが重要である。従来は専ら供給空気の温度制御によって種子の発芽性能の劣化防止が試みられていたが、本発明では、従来まったく着目されていなかった供給空気の絶対湿度を所定値以下とすることによって発芽性能の劣化を防止した。供給空気のより好ましい絶対湿度は１０ｇ／ｋｇ（ＤＡ）以下である。また、供給空気の好ましい下限値は４ｇ／ｋｇ（ＤＡ）である。供給空気の調湿は従来公知の方法及び装置で行えばよく、例えば、除湿機と加湿機とを併用すればよい。また、供給空気の調湿時期は、供給空気の加熱前及び加熱後のいずれであってもよく、加熱と同時であってもよい。 In the first step, it is important that the absolute humidity of the supply air is 14 g / kg (DA) or less. Conventionally, attempts have been made to prevent deterioration of seed germination performance exclusively by controlling the temperature of the supply air, but in the present invention, germination performance is reduced by setting the absolute humidity of the supply air, which has not been focused at all, to a predetermined value or less. Deterioration was prevented. The more preferable absolute humidity of the supply air is 10 g / kg (DA) or less. Moreover, the preferable lower limit of supply air is 4 g / kg (DA). The humidity of the supplied air may be adjusted by a conventionally known method and apparatus. For example, a dehumidifier and a humidifier may be used in combination. The humidity adjustment timing of the supply air may be before or after heating the supply air, or may be simultaneous with the heating.
第１工程における供給空気の温度は、種子の発芽性能の劣化を抑制する観点から、５０℃未満とする。より好ましくは４５℃以下である。 The temperature of the feed air in the first step, from the viewpoint of suppressing the deterioration of germination performance of seeds, and less than 50 ° C.. More preferably, it is 45 degrees C or less.
第１工程で用いる乾燥装置としては、空気を供給しながら種子を乾燥するものであれば特に限定はなく、従来公知の装置を用いることができる。例えば、回転式通気乾燥機等が挙げられる。また、空気の供給量は、装置の大きさや種子の充填量などから適宜決定すればよいが、例えば、風速が約１ｍ／ｓ〜約１０ｍ／ｓとなる範囲が好ましい。 The drying device used in the first step is not particularly limited as long as the seed is dried while supplying air, and a conventionally known device can be used. For example, a rotary aeration dryer or the like can be used. The amount of air supply may be determined as appropriate from the size of the device, the amount of seed filling, and the like. For example, a range in which the wind speed is about 1 m / s to about 10 m / s is preferable.
第１工程の終点指標としては、例えば限界含水率を用いることができる。限界含水率は前述の測定により求めることができ、乾燥中の被覆造粒種子の含水率を常時又は定期的に監視し、被覆造粒種子の含水率が限界含水率に達したところで第１工程を終了すればよい。また、乾燥処理を開始してから限界含水率となるまで乾燥時間を予め測定しておき、乾燥時間で第１工程の終点を管理するようにしてもよい。限界含水率は種子の種類や被覆層の厚みなどによって異なり、例えば、レタスやダイコン等の野菜種子の場合には、約５湿重量％〜約２０湿重量％程度である。 As the end point index of the first step, for example, the critical moisture content can be used. The limit moisture content can be determined by the above-described measurement, and the moisture content of the coated granulated seed during drying is monitored constantly or periodically. When the moisture content of the coated granulated seed reaches the limit moisture content, the first step Can be terminated. Alternatively, the drying time may be measured in advance from the start of the drying process until the limit moisture content is reached, and the end point of the first step may be managed by the drying time. The limit moisture content varies depending on the type of seed and the thickness of the coating layer. For example, in the case of vegetable seeds such as lettuce and Japanese radish, it is about 5% by weight to about 20% by weight.
次に、第２工程では供給空気の温度を５０℃以下とすることが重要である。このような低い温度で乾燥を行うことで種子の発芽性能の劣化が抑えられる。より好ましい供給空気の温度は４０℃以下である。 Next, in the second step, it is important that the temperature of the supply air is 50 ° C. or less. By drying at such a low temperature, deterioration of seed germination performance can be suppressed. A more preferable supply air temperature is 40 ° C. or lower.
第２工程で用いる乾燥装置としては、５０℃以下の温度で空気を供給できるものであれば特に限定はなく、例えば、回転式通気乾燥機や除湿乾燥機等が挙げられる。また、空気の供給量は、装置の大きさや種子の充填量などから適宜決定すればよいが、例えば、風速が約１ｍ／ｓ〜約１０ｍ／ｓとなる範囲が好ましい。 The drying device used in the second step is not particularly limited as long as it can supply air at a temperature of 50 ° C. or lower, and examples thereof include a rotary aeration dryer and a dehumidifying dryer. The amount of air supply may be determined as appropriate from the size of the device, the amount of seed filling, and the like. For example, a range in which the wind speed is about 1 m / s to about 10 m / s is preferable.
第２工程の終点指標としては、例えば被覆造粒種子の平衡含水率を用いることができる。平衡含水率は、前述の測定により求めることができ、乾燥中の被覆造粒種子の含水率を常時又は定期的に監視し、被覆造粒種子の含水率が平衡含水率に達したところで第２工程を終了する。また、乾燥処理を開始してから平衡含水率となるまで乾燥時間を予め測定しておき、乾燥時間で第２工程の終点を管理するようにしてもよい。平衡含水率は種子の種類や被覆層の厚みなどによって異なり、例えば、レタスやダイコン等の野菜種子の場合には、約３湿重量％〜約６湿重量％程度である。 As the end point index of the second step, for example, the equilibrium water content of the coated granulated seed can be used. The equilibrium moisture content can be obtained by the above-mentioned measurement. The moisture content of the coated granulated seed during drying is monitored constantly or periodically. When the moisture content of the coated granulated seed reaches the equilibrium moisture content, the second is measured. The process ends. Alternatively, the drying time may be measured in advance from the start of the drying process until the equilibrium moisture content is reached, and the end point of the second step may be managed by the drying time. The equilibrium moisture content varies depending on the type of seed and the thickness of the coating layer. For example, in the case of vegetable seeds such as lettuce and Japanese radish, it is about 3% by weight to about 6% by weight.
本発明に係る乾燥方法の対象である被覆造粒種子としては、種子表面を粉体材料で被覆したものであれば特に限定はない。例えば、粉体材料と、水又は水溶性バインダーとを用いて種子の表面の被覆したものが挙げられる。この場合、コーティング装置に種子を入れ、コーティング装置を回転させながら水又はバインダー水溶液を種子の表面にスプレー法などによって塗布し、次に、粉体材料を投入して粉体と種子とを結合させることによって、種子表面に被覆層を形成できる。この操作を繰り返すことによって被覆層の層厚を調整できる。コート種子の粒径としては通常１〜５ｍｍ程度であり、裸種子の大きさや形状等から粒径及び被覆層厚を適宜決定すればよい。 The coated granulated seed that is the subject of the drying method according to the present invention is not particularly limited as long as the seed surface is coated with a powder material. For example, what coated the surface of a seed using a powder material and water or a water-soluble binder is mentioned. In this case, the seed is put into the coating apparatus, and while rotating the coating apparatus, water or an aqueous binder solution is applied to the surface of the seed by a spray method or the like, and then the powder material is introduced to bind the powder and the seed. Thus, a coating layer can be formed on the seed surface. By repeating this operation, the thickness of the coating layer can be adjusted. The particle size of the coated seed is usually about 1 to 5 mm, and the particle size and the coating layer thickness may be appropriately determined from the size and shape of the bare seed.
粉体材料としては、例えば、珪藻土、水酸化アルミニウム、水酸化バリウム、水酸化マグネシウム、硫酸カルシウム、塩基性炭酸マグネシウム、シリカ、亜硫酸カルシウム、炭酸カルシウム、ケイ酸カルシウム、イライト、ハロサイト、ミクロサイト、バーミキュライト、ピートモス、砂、クレーなどが挙げられる。また水溶性バインダーとしては、例えば、デンプン、ＰＶＡ、ＣＭＣ、ＭＣ、ＨＰＣ、ゼラチンなどが挙げられる。 Examples of the powder material include diatomaceous earth, aluminum hydroxide, barium hydroxide, magnesium hydroxide, calcium sulfate, basic magnesium carbonate, silica, calcium sulfite, calcium carbonate, calcium silicate, illite, halosite, microsite, Vermiculite, peat moss, sand, clay and the like can be mentioned. Examples of the water-soluble binder include starch, PVA, CMC, MC, HPC, and gelatin.
被覆造粒する種子に特に限定はなく、農園芸で一般に使用される野菜種子、草花種子、緑化・飼料用種子などに適用できる。例えば、キュウリ、メロン、カボチャ等のウリ科、ナス、トマト、ペチュニア等のナス科、エンドウ、インゲン、アルファルファ、クローバー等のマメ科、タマネギ、ネギ等のユリ科、ダイコン、カブ、ハクサイ、キャベツ、ハナヤサイ、ハボタン、ストック、アリッサム等のアブラナ科、ニンジン、セルリー等のセリ科、ゴボウ、レタス、シンギク、アスター、ジニア、ヒマワリ等のキク科、シソ、サルビア等のシソ科、ホウレンソウ等のアカザ科、ロベリア等のキキョウ科、デルフィニウム等のキンポウゲ科、キンギョソウ等のゴマノハグサ科、プリムラ等のサクラソウ科、ベゴニア等のシュウカイドウ科、ビオラ、パンジー等のスミレ科、ユーストマ等のリンドウ科、デントコーン、シバ類、ソルゴー類等のイネ科の種子などが挙げられる。 There are no particular limitations on the seeds to be coated and granulated, and the seeds can be applied to vegetable seeds, flower seeds, greening / feeding seeds and the like generally used in agriculture and horticulture. For example, cucumbers, melons, pumpkins and other cucurbits, eggplants, tomatoes, petunias and other eggplants, peas, green beans, alfalfa, clovers and other legumes, onions, leeks, etc. Brassicaceae, such as Hanayasai, Habutton, Stock, Alyssum, etc. Ovalaceae such as Lobelia, Ranunculaceae such as Delphinium, Primordaceae such as Snapdragon, Primula such as Primula, Scarceae such as Begonia, Violet, Panacea and other violets, Eustoma and other gentian, Dent corn, Shiva, Sorgo For example, grass seeds That.
以下、本発明を実施例によりさらに詳しく説明するが本発明はこれらの例に何ら限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these examples at all.
実施例１
皿型回転造粒装置を用いて被覆造粒した直後のレタス被覆種子（含水率約４０湿重量％）１ｋｇを、回転式通気乾燥機の回転ドラム内に投入し、絶対湿度３．９ｇ／ｋｇ（ＤＡ）、温度３０℃の空気を回転ドラム内に供給した（風速５．０ｍ／ｓ）。そして、被覆造粒種子の含水率が約１１．１湿重量％程度（限界含水率：約９湿重量％）になるまで約５０分間乾燥させた。乾燥している間の被覆造粒種子の表面温度は２０℃〜３０℃に維持されていた。
次いで、温度３５℃の恒温槽中で含水率が約２．８湿重量％程度（平衡含水率：約３湿重量％）になるまで１２０分間静置乾燥させた。
そして下記の発芽試験を行った。試験結果を表１に示す。
Example 1
1 kg of lettuce-coated seed (water content: about 40% by weight) immediately after being coated and granulated using a dish-type rotary granulator is put into the rotary drum of a rotary aeration dryer, and the absolute humidity is 3.9 g / kg. (DA), air at a temperature of 30 ° C. was supplied into the rotating drum (wind speed 5.0 m / s). Then, the coated granulated seeds were dried for about 50 minutes until the moisture content reached about 11.1% by weight (limit moisture content: about 9% by weight). During drying, the surface temperature of the coated granulated seed was maintained at 20 ° C to 30 ° C.
Subsequently, it was allowed to stand and dry for 120 minutes in a constant temperature bath at a temperature of 35 ° C. until the water content became about 2.8% by weight (equilibrium water content: about 3% by weight).
And the following germination test was conducted. The test results are shown in Table 1.
（発芽試験）
被覆造粒種子５０粒／シャーレを、直径９ｃｍのシャーレ内にろ紙（アドバンテック社製、Ｎｏ．２）２枚を重ねて敷き詰め、４．５ｍＬの水を加えた上に播種した。このシャーレを３０℃・明条件（約３０００ルックス）下に置いた。そして、播種後２日経過後の発芽率（％）を測定した。
(Germination test)
50 pieces of coated granulated seeds / petri dish were spread on a petri dish having a diameter of 9 cm with two filter papers (manufactured by Advantech, No. 2) overlaid, seeded after adding 4.5 mL of water. This petri dish was placed at 30 ° C. under bright conditions (about 3000 lux). And the germination rate (%) after 2 days after sowing was measured.
実施例２
回転ドラムに供給する空気の絶対湿度を１４．３ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約１１．４湿重量％程度（限界含水率：約１０湿重量％）になるまで約５０分間乾燥させた以外は実施例１と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Example 2
Until the absolute humidity of the air supplied to the rotating drum is 14.3 g / kg (DA) and the moisture content of the coated granulated seed is about 11.4% by weight (limit moisture content: about 10% by weight) The coated granulated seed was dried in the same manner as in Example 1 except that it was dried for about 50 minutes. And the said germination test was done. The test results are shown in Table 1.
比較例１
回転ドラムに供給する空気の絶対湿度を１８．０ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約１２．８湿重量％程度（限界含水率：約１２湿重量％）になるまで約５０分間乾燥させた以外は実施例１と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Comparative Example 1
Until the absolute humidity of the air supplied to the rotating drum is 18.0 g / kg (DA) and the moisture content of the coated granulated seed is about 12.8% by weight (limit moisture content: about 12% by weight) The coated granulated seed was dried in the same manner as in Example 1 except that it was dried for about 50 minutes. And the said germination test was done. The test results are shown in Table 1.
実施例３
回転ドラムに供給する空気の絶対湿度を５．２ｇ／ｋｇ（ＤＡ）、温度を４５℃とし、被覆造粒種子の含水率が約６．９湿重量％程度（限界含水率：約６％）になるまで約３５分間乾燥させた以外は実施例１と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Example 3
The absolute humidity of the air supplied to the rotating drum is 5.2 g / kg (DA), the temperature is 45 ° C., and the moisture content of the coated granulated seed is about 6.9% by weight (limit moisture content: about 6%). The coated granulated seed was dried in the same manner as in Example 1 except that it was dried for about 35 minutes until. And the said germination test was done. The test results are shown in Table 1.
実施例４
回転ドラムに供給する空気の絶対湿度を１３．８ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約８．８湿重量％程度（限界含水率：約８％）になるまで約３５分間乾燥させた以外は実施例３と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Example 4
The absolute humidity of the air supplied to the rotating drum is set to 13.8 g / kg (DA), and about 35 until the moisture content of the coated granulated seed is about 8.8% by weight (limit moisture content: about 8%). The coated granulated seed was dried in the same manner as in Example 3 except that it was dried for a minute. And the said germination test was done. The test results are shown in Table 1.
比較例２
回転ドラムに供給する空気の絶対湿度を１７．１ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約９．２湿重量％程度（限界含水率：約８％）になるまで約３５分間乾燥させた以外は実施例３と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Comparative Example 2
The absolute humidity of the air supplied to the rotating drum is 17.1 g / kg (DA), and about 35 until the moisture content of the coated granulated seed is about 9.2% by weight (limit moisture content: about 8%). The coated granulated seed was dried in the same manner as in Example 3 except that it was dried for a minute. And the said germination test was done. The test results are shown in Table 1.
比較例３
回転ドラムに供給する空気の絶対湿度を４．２ｇ／ｋｇ（ＤＡ）、温度を５５℃とし、被覆造粒種子の含水率が約６．６湿重量％程度（限界含水率：約６湿重量％）になるまで約２５分間乾燥させた以外は実施例１と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Comparative Example 3
The absolute humidity of the air supplied to the rotating drum is 4.2 g / kg (DA), the temperature is 55 ° C., and the moisture content of the coated granulated seed is about 6.6% by weight (limit moisture content: about 6% by weight) %), The coated granulated seeds were dried in the same manner as in Example 1 except that they were dried for about 25 minutes. And the said germination test was done. The test results are shown in Table 1.
比較例４
回転ドラムに供給する空気の絶対湿度を１３．９ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約８．３湿重量％程度（限界含水率：約７％）になるまで約２５分間乾燥させた以外は比較例３と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Comparative Example 4
The absolute humidity of the air supplied to the rotating drum is set to 13.9 g / kg (DA), and about 25 until the moisture content of the coated granulated seed reaches about 8.3% by weight (limit moisture content: about 7%). The coated granulated seed was dried in the same manner as in Comparative Example 3 except that it was dried for a minute. And the said germination test was done. The test results are shown in Table 1.
比較例５
回転ドラムに供給する空気の絶対湿度を１５．４ｇ／ｋｇ（ＤＡ）とし、被覆造粒種子の含水率が約８．６湿重量％程度（限界含水率：約７％）になるまで約２５分間乾燥させた以外は比較例３と同様にして被覆造粒種子を乾燥した。そして、前記の発芽試験を行った。試験結果を表１に示す。
Comparative Example 5
The absolute humidity of the air supplied to the rotating drum is 15.4 g / kg (DA), and about 25 until the moisture content of the coated granulated seed becomes about 8.6% by weight (limit moisture content: about 7%). The coated granulated seed was dried in the same manner as in Comparative Example 3 except that it was dried for a minute. And the said germination test was done. The test results are shown in Table 1.
表１から明らかなように、第１工程において、絶対湿度が１４ｇ／ｋｇ（ＤＡ）以下の供給空気で被覆造粒種子を乾燥した実施例１〜４では、発芽率が９３％以上と高い値であった。これに対し、第１工程において、絶対湿度が１４ｇ／ｋｇ（ＤＡ）を超える供給空気で被覆造粒種子を乾燥した比較例１，２，５では、発芽率が７８％以下と低い値であった。また、第１工程の乾燥温度を５５℃と高めた比較例３，４の乾燥方法では、被覆造粒種子の発芽率は８８％，８６％と、実施例１〜４の乾燥方法に比べて発芽率は低下した。 As is apparent from Table 1, in Examples 1 to 4 in which the coated granulated seed was dried with the supply air having an absolute humidity of 14 g / kg (DA) or less in the first step, the germination rate was as high as 93% or more. Met. In contrast, in Comparative Examples 1 , 2 , and 5 in which the coated granulated seeds were dried with the supply air having an absolute humidity exceeding 14 g / kg (DA) in the first step, the germination rate was as low as 78% or less. It was. Moreover, in the drying method of the comparative examples 3 and 4 which raised the drying temperature of the 1st process to 55 degreeC, the germination rate of a covering granulated seed is 88% and 86%, compared with the drying method of Examples 1-4. Germination rate decreased.
本発明の乾燥方法は、乾燥させる時季や場所などにかかわらず、発芽性能を劣化させることなく被覆造粒種子を乾燥でき有用である。 The drying method of the present invention is useful for drying coated granulated seeds without deteriorating germination performance regardless of the season and place of drying.
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