Soil compaction also causes roots to suffocate. Preventing compaction is the key to protecting root systems. Filling or Paving - Paving near trees frequently deprives the roots of needed oxygen. By careful planning and the use of retaining walls, you can avoid filling over root systems, and add years of life to trees. Nutritional Deficiencies - Proper tree growth depends on sixteen essential nutrients.
Nutrient deficiencies show up as leaf or needle discoloration and abnormal growth patterns.
Fertilization corrects this problem. Avoid fertilizers containing herbicides that harm trees. Fertilizers containing excessive nitrogen should not be used near young trees. High nitrogen fertilizers cause accelerated top growth creating an imbalance between the crown and root system. The pH Factor - Nutrient absorption relates directly to soil pH levels.