ISA Arborist Chapter 5 questions with correct answers

Cation exchange capacity CORRECT ANSWER Ability of the soil to absorb and hold cations. Affected by soil ph. Measures soil fertility, clay composition and engineering characteristics. Chelate CORRECT ANSWER Chemical compound that keeps plant nutrients [usually iron(Fe)] soluble and available for plant absorption over a broad range of ph. Chlorosis CORRECT ANSWER White or yellowish leaf discoloration caused by lack of chlorophyll. Often caused by nutrient deficiency. Complete fertilizer CORRECT ANSWER Fertilizer containing the three primary elements: nitrogen(N), phosphorous (P), and potassium (K). Drill-hole method CORRECT ANSWER (Of fertilization) applying fertilizer by drilling holes in the soil within the root zone. Drip line CORRECT ANSWER Imaginary line defined by the branch spread of a single plant or group of plants. Essential element CORRECT ANSWER 17 minerals essential to the growth and development of trees. These minerals are essential because plants cannot complete their life cycle without them.