Soil Inspection・土壌検査に関して

Dogwood:  Soil Inspection

At the recommendation of our tree doctor, we require a soil inspection and soil improvement before we send you the dogwood trees, in order to select the most suitable trees for your planting climate.  If you plan to plant trees in different areas, we require a soil inspection for each separate section.

Please contact your prefectural government’s agriculture and forestry department, greenery center, or agricultural experiment station for recommended laboratories that conduct soil inspections.  (Inspection by a private organization will be a paid service, and the fees required to conduct these inspections are the responsibility of the applicants).

Please include the soil inspection report with your completed application.

If there is not enough time for soil improvement before planting, it is possible to conduct soil improvement at the time of or even after the planting. If and when we approve your application, if your soil conditions are less than ideal, we suggest you consult with local tree experts (at your expense) to prepare your grounds for the dogwood trees.
Reference

  • Soil Conditions for Planting Dogwood

The dogwood, compared to other trees, is relatively sensitive to its growth environment.  Dogwood trees do best in soil that has high water retention and drainage ability, and appropriate compaction (hardness and density).  As for the chemical properties of the soil, the pH value should be around 6.0, EC (electric conductivity) the value should be around 0.5, and the phosphoric acid and potassium parallel balance should be between 20-30 mS.  If your soil sample doesn’t meet these general criteria, the soil conditions should be brought to these levels before or just after planting the trees.

  • Selecting Planting Locations based on Varieties of Dogwood

Many varieties of Cornus Florida—which is the largest variety of dogwood trees we have available–share the following characteristics:

  1. Vulnerability to salty wind
  2. Vulnerability to cold weather
  3. Vulnerability to dry weather
  4. Vulnerability to excessive moisture in soil
  5. Vulnerability to Powdery Mildew

By improving the soil environment before planting and by selecting the varieties of tress that match best with the characteristics of the environment, we can maximize the healthy and longevity of your dogwood trees.

 

ハナミズキ: 土壌検査に関して

樹木医からのアドバイスとしては、やはり土壌の検査を行い、できるだけ植栽前に土壌改良を実施することが望ましい。複数の場所に分けて植栽する場合は、場所ごとの土壌検査が必要。

各都道府県庁の農林部、緑化センター、農業試験場などで検査をしてもらえる。(民間機関による検査は有料であり、その費用は申請者の負担となる旨を了解のこと。)申請書には、土壌検査の結果も併せて提出のこと。

もしも植樹までに改良が間に合わなければ、植える際や植栽後にも土壌環境を改善することは可能なので、よりよい環境にすることが望まれる。申請が承認されたとしても未だ適正条件を充分に満たしていない場合には、ぜひ地元の専門業者に相談の上、ハナミズキに適する土壌に整えることを奨励する。(このようなコンサルテーションに掛かる費用も申請者側にて賄えること。)

参考

●植樹する土壌の条件

ハナミズキは植樹後の生育が他の樹木と比較してデリケートで土壌の物理性の内、保水性、排水性、堅蜜性が良好であり、土壌の化学性はPH値6.0内外、EC値0.5内外、リン酸とカリが20-30ミリジーメンスの平行バランスで含まれていることが最も生育に適することから、なるべく植樹前に土壌改良を実施することが望ましい。

●ハナミズキの品種による植樹地の生育Cornus floridaの多くの品種は、①潮風に弱い、②寒さに弱い、③乾燥に弱い、④過湿土壌に弱い、⑤ウドンコ病に弱いことがあげられる。植樹地の土壌環境を改善することと特性の適合する品種の選択によりハナミズキの生育が旺盛になり、環境に順応する度合いが高くなる。(from Dr. Hagiwara  4/2013)