RESPONSE OF PINUS RESINOSA AIT PLANTATIONS TO POTASSIUM FERTILIZATION ON A POTASSIUM-DEFICIENT SITE

Using deviations of the cumulative height growth due to fertilization treatments from the linear finite difference curve of untreated red pine trees in plantations, it was noted that: 1) large-sized trees responded in height growth to fertilization in the year following treatment while the medium and small trees took two years to respond; 2) medium-size trees responded to fertilization similar to large trees, but to a lesser magnitude; and 3) small trees are further suppressed by fertilization due to growth responses in the large medium trees. © 1969 Martinus Nijhoff.