High fertility in the rooting medium favours shoot growth over root growth, and can produce top-heavy seedlings ill suited to the rigors of the outplant site.
12.
Some propagation guides recommend first soaking the rooting medium with a mild vinegar solution ( one tablespoon to a gallon of water ), because slightly acid conditions encourage rooting.
13.
Nitrogen availability in the rooting medium also affects the size and structure of tracheids formed in the long lateral roots of white spruce ( Krasowski and Owens 1999 ).
14.
A leaf with 1.5cm to 2cm length of leaf stalk attached can be inserted into coarse or medium grade sand or sand : peat in 1 : 1 ratio can be used as rooting medium.
15.
An increase in moisture stress in the rooting medium as small as 5 atmospheres affects growth, transpiration, and internal water balance in seedlings, much more so in Norway spruce than in birch, aspen, or Scots pine.
16.
A leaf with 1 . 5cm to 2cm length of leaf stalk attached can be inserted into coarse or medium grade sand or sand : peat in 1 : 1 ratio can be used as rooting medium.
17.
Also planted with the tree are other containers that are not filled with rooting medium, but in which the container is a molded block of growing medium, as with Polyloam ? Tree Start ? and BR-8 Blocks ?
18.
Under this system a water-tight growing bed, containing either clean gravel or coarse sand as the rooting medium, is periodically flooded for a short period ( 5 to 10 minutes ) with a nutrient solution pumped from a supply tank.
19.
Some containers are designed to be planted with the tree e . g ., the tar paper pot, the Alberta peat sausage, the Walters square bullet, and paper pot systems, are filled with rooting medium and planted with the tree ( Tinus and McDonald 1979 ).
