JP2004313093A

JP2004313093A - Additive for culture medium for mushroom, and culture medium for mushroom

Info

Publication number: JP2004313093A
Application number: JP2003112751A
Authority: JP
Inventors: Seiji Miyauchi; 誠二宮宇地
Original assignee: Kyowa Chemical Industry Co Ltd
Current assignee: Kyowa Chemical Industry Co Ltd
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2004-11-11
Anticipated expiration: 2023-04-17
Also published as: JP4127806B2

Abstract

<P>PROBLEM TO BE SOLVED: To increase the yield of mushroom regardless of the kinds of the mushroom and to inexpensively obtain the stable yield without requiring manpower such as the one for mixing in a basic culture medium for artificial culture of the mushroom. <P>SOLUTION: The additive for the basic culture medium is obtained by formulating an aluminum-magnesium coprecipitated and dried product of an inorganic material having antacid activities, and regulating the neutralizing ability by changing the content of each element at the time so that the medium may have the most suitable growing pH and may keep the growing pH. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】本発明はきのこ培養基に関する。
【０００２】
【従来の技術】現在、ブナシメジ、ヒラタケ、エリンギ、マイタケ、エノキタケ等の食用きのこの人工栽培は、鋸屑、コ−ンコブ、バガス、ビ−ト粕等の粉砕物を基材にして、これに米糠、ふすま等の栄養源を添加した培養基が主流となっている。これらは瓶または袋で栽培を行う菌床栽培で一年を通じて収穫ができ、現在では企業による大規模的な工業スケ−ルで大量生産が行われている。
通常、鋸屑、コ−ンコブ、バガス、ビ−ト粕等からなる基材に米糠、ふすま等の栄養源を添加した場合、これらの基材の組み合わせによっては培養基のｐＨがきのこの生育に適したｐＨより低くなったり、瓶、又は袋に充填した培養基が高圧滅菌処理を行うまでの間に腐敗等により変質し、培養基内のｐＨが低下することがあった。
これらの問題解決のために、（特開平１−３４２１６号公報）では培養基にきのこの生育に適したｐＨに調整し、かつ、きのこの生育期間中もその適正ｐＨを維持できるように制酸性のある無機物等（以後、単に制酸剤と記す。）を培養基中に添加している。きのこの生育に適したｐＨを維持することは、きのこの収量を大幅に高め、かつ、安定した収量が得られる。
【０００３】
【発明が解決しようとする課題】
より詳しく記すれば培養基の構成物によっては培養基のｐＨが５．５以下の酸性に片寄る場合があり、特にビ−ト粕、コ−ンコブ、バガス等の粉砕物を培養基材に用いると培養基のｐＨが低くなる傾向が見られる。この原因はこれらの構成物に、鋸屑には含まれない糖分が多量に残っており、その糖分の一部は、基材に配合される前の段階で、すでに腐敗等の影響により分解され有機酸が発生しているためで、これが、培養基内のｐＨを低下させている原因となっていた。このままでは、きのこの至適、生育ｐＨを下回ることになり、高いきのこの収量が得られない事が多く、制酸剤の添加が必要となっている。
しかしながら、特開平１−３４２１６号公報に紹介されている制酸剤の中には比較的高い生育ｐＨを要求するきのこや、培養基の構成においては、かならずしも満足の行くものではない。合成水酸化アルミニウムゲルや合成ケイ酸アルミニウムは安価ではあるが、これらの制酸剤は、制酸力を発揮する金属カチオンがアルミニウムである為に酸を中和するｐＨが４．０付近と低く、きのこの種類によっては生育するｐＨに対して低い場合がみられ、通常、これらの問題点を解決するために中和能力の異なるもの（制酸特性の異なるもの。中和作用を発揮するｐＨ領域が違うもの。）を２種類以上組み合わせたり、多種類の金属カチオンを含有した制酸剤を用いなければならなかった。これらは高価格であったり、または添加量の増加や混合等の手間を必要とし、コスト競争の厳しいきのこの業界においては優位性に劣っており、本発明者等はこれらの問題点を解決する制酸剤を探求してきた。
【０００４】
【課題を解決しようとする手段】
様々な制酸剤を試験したところ、合成水酸化アルミニウムゲルや合成ケイ酸アルミニウムのように安価でありながら、前記した問題点を解決した制酸剤を探しだすことに成功した。
本発明において次の化学式（１）で表される合成水酸化アルミニウム・マグネシウム共沈乾燥物は各種きのこの生育に適したｐＨに合わせられるように以下の範囲において組成比を変更できる特徴を持っている制酸剤である。合成水酸化アルミニウム・マグネシウム共沈乾燥物は、Ａｌ_２Ｏ_３含量を２０．０〜４５．０重量％、ＭｇＯ含量を２０．０〜３７．０重量％の範囲において変更できる。また、化学組成比は次に示される。
（Ａｌ_２Ｏ_３）・（ＭｇＯ）_Ｘ・ｎＨ_２Ｏ・・・（１）
式中のＸは１．１２〜４．６８で、ｎは式中の化合物の含水量を表している。
合成水酸化アルミニウム・炭酸マグネシウム共沈乾燥物は、Ａｌ_２Ｏ_３含量を４０．０〜５５．０重量％、ＭｇＯ含量を１．０〜１０．０重量％、ＣＯ_２含量を１．０〜１５．０重量％の範囲において変更できる。また、化学組成比は次に示される。
（Ａｌ_２Ｏ_３）・（ＭｇＯ）_Ｘ・（ＣＯ_２）_Ｙ・ｍＨ_２Ｏ・・・（２）
式中のＸは０．０６〜０．６３で、Ｙは０．０４〜０．８７で、ｍは式中の化合物の含水量を表している。
また、同様に、合成水酸化マグネシウム・硫酸アルミニウム共沈乾燥物はＡｌ_２Ｏ_３含量を１５．０〜３５．０重量％、ＭｇＯ含量を２５．０〜４５．０重量％、ＳＯ_４含量を１１．０〜２６．０重量％の範囲において変更できる。また、化学組成比は次に示される。
（Ａｌ_２Ｏ_３）・（ＭｇＯ）_Ｘ・（ＳＯ_４）_Ｙ・ｐＨ_２Ｏ・・・（３）
式中のＸは１．８０〜７．６０で、Ｙは０．３３〜１．８４で、ｐは式中の化合物の含水量を表している。
これらの制酸剤は前記した範囲において各元素の含量を変更することにより、きのこの品種それぞれに、もっとも適した生育ｐＨに適合し、かつ、その生育ｐＨを維持できる性能を発揮するものである。
【０００５】
【発明の効果】
本発明による制酸剤をきのこ培養基に添加すれば、従来の制酸剤と比較して、より少ない添加量で高いきのこ収量が安定して得られる。
【０００６】
【実施例１】
対照区１
鋸屑９０ｇにコ−ンコブ粉砕物３０ｇと米糠６０ｇ、さらに特開平１−３４２１６号公報に記載されている協和化学工業株式会社製、合成水酸化アルミニウムＡｌ_２Ｏ_３含量、５３重量％からなるものを｛Ａｌ（ＯＨ）_３・ｎＨ_２Ｏの化学組成式で表され、式中ｎは化合物の水分量を表す｝１．５ｇ加え、よく混合する。さらに、水を加えて水分６３重量％に調整した培養基を８５０ｍＬ容ポリプロピレン製ビンに充填し高圧滅菌する。冷後、ブナシメジの菌を接種し、２５℃で７０日間培養した。菌掻きを行った後、さらに、１５℃で２０日間培養を続け、１５０ｇのブナシメジを得た。
実施区１
対照区１の培養基の素材を混合する時に、合成水酸化アルミニウムの代わりに、協和化学工業株式会社製、合成水酸化アルミニウム・マグネシウム共沈乾燥物、商品名サナルミンＡｌ_２Ｏ_３含量、２８．５重量％、ＭｇＯ含量３０．０重量％からなる制酸剤、｛（Ａｌ_２Ｏ_３）（ＭｇＯ）_２．６６・１．２７（Ｈ_２Ｏ）の化学組成式で表される｝を１．５ｇ添加する。あとは対照区１と同様に操作を行い、１７５ｇのブナシメジを得た。
実施区２
対照区１の培養基の素材を混合する時に合成水酸化アルミニウムの代わりに、協和化学工業株式会社製、合成水酸化マグネシウム・硫酸アルミニウム共沈乾燥物、商品名マガルドレ−トＡｌ_２Ｏ_３含量、２０．８重量％、ＭｇＯ含量、３３．２重量％、ＳＯ_４含量、１９．９重量％からなる制酸剤、化学組成式では次に示される。｛（Ａｌ_２Ｏ_３）（ＭｇＯ）_４．０４（ＳＯ_４）_０．９０・ｐＨ_２Ｏの化学組成式で表される｝を１．５ｇ添加する。あとは対照区１と同様に操作を行い、１７０ｇのブナシメジを得た。
【実施例２】
対照区１
鋸屑１００ｇ、米糠９０ｇと特開平１−３４２１６号公報に記載されている合成ケイ酸アルミニウムＡｌ_２Ｏ_３・９ＳｉＯ_２・ｎＨ_２Ｏ（式中のｎは化合物の水分量を表す）Ａｌ_２Ｏ_３含量、１２重量％からなる制酸剤を１．５ｇ加え、よく混合する。さらに、水を加えて水分６５重量％に調整した培養基を８５０ｍＬ容ポリプロピレン製ビンに充填し高圧滅菌する。冷後、ヒラタケの菌を接種し、２５℃で３０日間培養した。菌掻き後、１５℃で１４日間培養を続け、９０ｇのヒラタケを得た。
実施区１
対照区１の培養基の素材を混合する時に合成ケイ酸アルミニウムの代わりに、協和化学工業株式会社製、合成水酸化アルミニウム・炭酸マグネシウム共沈乾燥物、商品名アルタ、Ａｌ_２Ｏ_３含量、４１．１重量％、ＭｇＯ含量、７．８重量％、ＣＯ２含量、１２．７重量％からなる制酸剤、｛（Ａｌ_２Ｏ_３）・（ＭｇＯ）_０．４５・（ＣＯ_２）_０．６８・２．５６Ｈ_２Ｏの化学組成式で表される｝を１．５ｇ添加する。あとは対照区１と同様に操作を行い、１１０ｇのヒラタケを得た。
【０００７】
制酸性試験の比較図
実施例１と実施例２の対照区で用いた特開平１−３４２１６号に記載の無機合成物（制酸剤）の制酸特性（フックス変法）を図−１（合成水酸化アルミニウム）、図−２（合成ケイ酸アルミニウム）に示す。
同様に実施例１と実施例２の実施区で用いた無機物（制酸剤）の制酸特性（フックス変法）を図−３（合成水酸化アルミナ・マグネシウム共沈乾燥物、商品名・サナルミン）、図−４（合成水酸化マグネシウム・硫酸アルミニウム共沈乾燥物、商品名・マガルドレ−ト）、図−５（合成水酸化アルミニウム・炭酸マグネシウム共沈乾燥物、商品名・アルタ）に示す。
図からも明らかなように、特開平１−３４２１６号に記載の合成水酸化アルミニウム、合成ケイ酸アルミニウムは初期のｐＨが４．０より上がらず、低いｐＨ域で制酸性を示すが、本発明品は初期のｐＨが４．０以上と比較的高い制酸性を示す。
また、本発明における制酸剤は少ない添加量においても、高いきのこ収量が得られる特徴を持っており、コスト競争の厳しいきのこ栽培に適応するものである。
【制酸作用図、フックス変法試験】

【Ｆｕｃｈｓ変法の試験方法】
ｐＨメーター、及び恒温槽（３７±２℃設定）のスイッチを入れる。
水温３７℃でｐＨメーターを調整する。緩衝液４．００で４．０２、６．８８で６．８４に合わす。４００ｍＬ容ビーカーに０．１ｍｏｌ／Ｌ塩酸（ｆ＝０．９９０〜１．０１０）５０ｍＬを正確に量る。バー３．５ｃｍを入れ、恒温槽中にセットする。
マグネチックスターラーを作動（４３０±３０ｒｐｍ）させ、温度計を取り付けた電極をセットする。
吐出量を２．０±０．１ｍＬ／ｍｉｎ．に調整した定量ポンプの吐出ホースの先を４００ｍＬビーカーにセットする。
液温が３７±０．５℃になれば、正確に量った試料を１．０００ｇ投入し、同時にストップウォッチ、及び記録計をスタートさせる。
試料投入後、はじめてｐＨ３．０に達する時間、ｐＨ３．５に達する時間、１０分後のｐＨ値を記録し、試料投入１０分後直ちに定量ポンプを作動する。
ｐＨ３．０を切る時間（のび時間）を記録する。[0001]
The present invention relates to a mushroom culture medium.
[0002]
2. Description of the Related Art At present, artificial cultivation of edible mushrooms such as Bunashimeji, Oyster mushroom, Elingi, Maitake mushroom, Enokitake mushroom, etc. is based on pulverized materials such as sawdust, corn cob, bagasse, beet cake and the like. A culture medium to which nutrients such as bran and the like are added has become mainstream. These can be harvested year-round by fungal bed cultivation in bottles or bags, and are now mass-produced on a large industrial scale by companies.
Usually, when a nutrient such as rice bran or bran is added to a substrate made of sawdust, corn cob, bagasse, beet meal, etc., the pH of the culture medium is suitable for the growth of mushrooms depending on the combination of these substrates. In some cases, the pH of the culture medium dropped below the pH, or the culture medium filled in a bottle or a bag deteriorated due to spoilage or the like until the high-pressure sterilization treatment was performed.
In order to solve these problems, Japanese Patent Application Laid-Open No. 1-34216 discloses a method in which a culture medium is adjusted to a pH suitable for the growth of mushrooms, and the antacid is adjusted so that the appropriate pH can be maintained during the mushroom growth period. Certain inorganic substances (hereinafter simply referred to as antacids) are added to the culture medium. Maintaining a pH suitable for mushroom growth greatly increases the yield of the mushroom and provides a stable yield.
[0003]
[Problems to be solved by the invention]
More specifically, depending on the composition of the culture medium, the pH of the culture medium may be biased to an acidity of 5.5 or less. Tends to decrease. The cause is that a large amount of sugar not contained in the sawdust remains in these components, and a part of the sugar is decomposed by the influence of decay, etc., before it is blended into the base material, and the organic matter is degraded. This was due to the generation of acid, which caused the pH in the culture medium to decrease. If it is left as it is, it will be below the optimum mushroom growth pH, and often high yields of mushrooms cannot be obtained, necessitating the addition of antacids.
However, among the antacids disclosed in JP-A-1-34216, mushrooms that require a relatively high growth pH and compositions of culture media are not always satisfactory. Synthetic aluminum hydroxide gel and synthetic aluminum silicate are inexpensive, but these antacids have a low pH of around 4.0, which neutralizes acid, because the metal cation that exerts antacid power is aluminum. Depending on the type of mushrooms, it may be lower than the pH at which the mushrooms grow. Usually, in order to solve these problems, those having different neutralizing abilities (those having different antacid properties. In this case, two or more kinds of antacids containing different kinds of metal cations had to be used. These are expensive or require the trouble of increasing the amount of addition or mixing, and are inferior in this industry where cost competition is severe, and the present inventors solve these problems. I have been searching for antacids.
[0004]
[Means to solve the problem]
When various antacids were tested, they were able to find an antacid that was inexpensive, such as synthetic aluminum hydroxide gel and synthetic aluminum silicate, but solved the above-mentioned problems.
In the present invention, the synthetic aluminum hydroxide / magnesium coprecipitated dried product represented by the following chemical formula (1) has a feature that the composition ratio can be changed in the following range so as to be adjusted to a pH suitable for the growth of various mushrooms. Is an antacid. The synthetic aluminum hydroxide / magnesium hydroxide coprecipitated product can have an Al ₂ O ₃ content of 20.0-45.0% by weight and a MgO content of 20.0-37.0% by weight. The chemical composition ratio is shown below.
(Al ₂ O ₃ ) · (MgO) _X · nH ₂ O (1)
X in the formula is 1.12 to 4.68, and n represents the water content of the compound in the formula.
The synthetic aluminum hydroxide / magnesium carbonate coprecipitated dried product has an Al ₂ O ₃ content of 40.0 to 55.0% by weight, a MgO content of 1.0 to 10.0% by weight, and a CO ₂ content of 1.0 to 1.0%. It can be changed in the range of 15.0% by weight. The chemical composition ratio is shown below.
(Al ₂ O ₃ ) · (MgO) _X · (CO ₂ ) _Y · mH ₂ O (2)
X in the formula is from 0.06 to 0.63, Y is from 0.04 to 0.87, and m represents the water content of the compound in the formula.
Similarly, the synthetic magnesium hydroxide / aluminum sulfate coprecipitated dried product has an Al ₂ O ₃ content of 15.0 to 35.0% by weight, an MgO content of 25.0 to 45.0% by weight, and an SO ₄ content of It can be changed in the range of 11.0 to 26.0% by weight. The chemical composition ratio is shown below.
(Al ₂ O ₃ ) · (MgO) _X · (SO ₄ ) _Y · pH ₂ O (3)
X in the formula is 1.80 to 7.60, Y is 0.33 to 1.84, and p represents the water content of the compound in the formula.
By changing the content of each element in the above range, these antacids are adapted to the most suitable growth pH for each mushroom variety, and exhibit the performance of maintaining the growth pH. .
[0005]
【The invention's effect】
When the antacid according to the present invention is added to the mushroom culture medium, a higher yield of mushrooms can be stably obtained with a smaller amount of addition compared to conventional antacids.
[0006]
Embodiment 1
Control 1
90 g of sawdust, 30 g of crushed concob and 60 g of rice bran, and a mixture of 53% by weight of synthetic aluminum hydroxide Al ₂ O ₃ manufactured by Kyowa Chemical Industry Co., Ltd. described in JP-A-1-34216, and It is represented by the chemical composition formula of ｛Al (OH) ₃ .nH ₂ O, where n represents 水分 1.5 g of the water content of the compound, and mixed well. Further, a culture medium adjusted to 63% by weight of water by adding water is filled in an 850 mL polypropylene bottle and sterilized by high pressure. After cooling, fungi of Bunashimeji were inoculated and cultured at 25 ° C. for 70 days. After scraping the bacteria, the culture was further continued at 15 ° C. for 20 days to obtain 150 g of Bunashimeji.
Implementation ward 1
When mixing the material of the culture medium of the control section 1, instead of synthetic aluminum hydroxide, Kyowa Chemical Industry Co., Ltd., synthetic aluminum hydroxide / magnesium coprecipitated dried product, trade name Sanalmin Al ₂ O ₃ content, 28.5 An antacid consisting of 3% by weight of MgO and 30.0% by weight of MgO, {} represented by the chemical composition formula of (Al ₂ O ₃ ) (MgO) _2.66.1.27 (H ₂ O)} was 1. Add 5 g. Thereafter, the same operation as in the control section 1 was performed to obtain 175 g of Bunashimeji.
Implementation ward 2
Instead, manufactured by Kyowa Chemical Industry Co., Ltd., synthetic magnesium hydroxide Aluminum sulfate coprecipitated dried product, trade name Magarudore synthetic aluminum hydroxide when mixed material culture of control group 1 - DOO Al ₂ O ₃ content, 20 .8 wt%, MgO content of 33.2 wt%, SO ₄ content, antacid consisting of 19.9 wt%, then as shown in the chemical formula. The _{_{_{{(Al 2 O 3) (}}} MgO) 4.04 (SO 4) represented by the chemical composition formula of _0.90 · pH ₂ O} is added 1.5 g. After that, the same operation as in the control section 1 was performed to obtain 170 g of Bunashimeji.
Embodiment 2
Control 1
100 g of sawdust, 90 g of rice bran and synthetic aluminum silicate Al ₂ O ₃ .9 SiO ₂ .nH ₂ O described in JP-A-1-34216 (where n represents the water content of the compound) Al ₂ O ₃ 1.5 g of an antacid consisting of 12% by weight is added and mixed well. Further, a culture medium adjusted to a water content of 65% by weight by adding water is filled in an 850 mL polypropylene bottle and sterilized by high pressure. After cooling, oyster mushrooms were inoculated and cultured at 25 ° C. for 30 days. After scraping the bacteria, the culture was continued at 15 ° C. for 14 days to obtain 90 g of oyster mushroom.
Implementation ward 1
When mixing the material of the culture medium in the control section 1, instead of synthetic aluminum silicate, synthetic aluminum hydroxide / magnesium carbonate coprecipitated dried product, trade name: Alta, Al ₂ O ₃ content, 41. 1 wt%, MgO content, 7.8 wt%, CO2 content, 12.7 consist wt% _{_{_{_{antacid, 0.68 · {(Al 2 O}}}} 3) · (MgO) 0.45 · (CO 2) 1.5 g of｝ represented by the chemical composition formula of 2.56H ₂ O is added. After that, the same operation as in the control section 1 was performed to obtain 110 g of oyster mushroom.
[0007]
Comparison of antacid test Fig. -1 shows the antacid properties (Fuchs modified method) of the inorganic compound (antacid) described in JP-A-1-34216 used in the control groups of Example 1 and Example 2. This is shown in FIG. 2 (synthetic aluminum hydroxide) and FIG.
Figure 3 (Synthetic alumina hydroxide / magnesium coprecipitated dried product, Sanalmin, trade name) of the inorganic substance (antacid) used in the working sections of Example 1 and Example 2 ), FIG. 4 (synthetic magnesium hydroxide / aluminum sulfate coprecipitated dried product, trade name: Magardrate), and FIG. 5 (synthetic aluminum hydroxide / magnesium carbonate coprecipitated dried product, trade name: Alta).
As is apparent from the figure, the synthetic aluminum hydroxide and synthetic aluminum silicate described in JP-A-1-34216 do not have an initial pH higher than 4.0 and exhibit antacidity in a low pH range. The product has a relatively high antacidity with an initial pH of 4.0 or more.
Further, the antacid in the present invention has a feature that a high mushroom yield can be obtained even with a small addition amount, and is suitable for mushroom cultivation in which cost competition is severe.
[Antiacid action diagram, Fuchs modified test]

[Test method of Fuchs modified method]
Switch on the pH meter and thermostat (set at 37 ± 2 ° C.).
Adjust the pH meter at a water temperature of 37 ° C. Combine 4.02 with buffer 4.00 and 6.84 with 6.88. Accurately measure 50 mL of 0.1 mol / L hydrochloric acid (f = 0.990 to 1.010) in a 400 mL beaker. Insert a 3.5 cm bar and set in a thermostat.
Activate the magnetic stirrer (430 ± 30 rpm) and set the electrode with thermometer attached.
The discharge rate was 2.0 ± 0.1 mL / min. Set the tip of the discharge hose of the metering pump adjusted to above into a 400 mL beaker.
When the liquid temperature becomes 37 ± 0.5 ° C., 1.000 g of the accurately weighed sample is added, and at the same time, the stopwatch and the recorder are started.
After the sample is charged, the time to reach pH 3.0 for the first time, the time to reach pH 3.5, and the pH value after 10 minutes are recorded, and the metering pump is operated immediately after 10 minutes from the sample input.
The time at which the pH drops below 3.0 (growth time) is recorded.

Claims

Al ₂ O ₃ is in the 15.0 to 55.0 wt%, MgO is at from 1.0 to 55.0 wt%, divalent if necessary of a carbonate ion or sulfate ion 1.0 to 30.0 wt% An additive for a basic culture medium for mushroom cultivation, which is a dried product of coprecipitated aluminum and magnesium, which may be contained.

The aluminum hydroxide / magnesium coprecipitated dry product represented by the formula (1) has an Al ₂ O ₃ content of 20.0 to 45.0% by weight and an MgO content of 20.0 to 37.0% by weight. The additive for a basic culture medium for mushroom cultivation according to claim 1.
(Al ₂ O ₃ ) · (MgO) _X · nH ₂ O (1)
Here, X = 1.12 to 4.68, and n represents the water content of the compound in the formula.

The aluminum hydroxide-magnesium carbonate coprecipitated dry product represented by the formula (2) has an Al ₂ O ₃ content of 40.0 to 55.0% by weight, an MgO content of 1.0 to 10.0% by weight, for mushroom cultivation base culture medium additive according to claim 1 CO ₂ content of 1.0 to 15.0 wt%.
(Al ₂ O ₃ ) · (MgO) _X · (CO ₂ ) _Y · mH ₂ O (2)
Here, X = 0.06 to 0.63, Y = 0.04 to 0.87, and m represent the water content of the compound in the formula.

The magnesium hydroxide-aluminum sulfate coprecipitated dry product represented by the formula (3) has an Al ₂ O ₃ content of 15.0 to 35.0% by weight, an MgO content of 25.0 to 45.0% by weight, for mushroom cultivation base culture medium additive according to claim 1 SO ₄ content of 11.0 to 26.0 wt%.
(Al ₂ O ₃ ) · (MgO) _X · (SO ₄ ) _Y · pH ₂ O (3)
Here, X = 1.80 to 7.60, Y = 0.33 to 1.84, and p represents the content of the compound in the formula.

A culture medium for mushroom cultivation, wherein the additive according to claim 1 is added at a ratio of 0.05 to 3.0% by weight.