Plant Nutrition and Fertilization Flashcards
6 cards from real CH practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Plant Nutrition and Fertilization flashcards as text
Which macronutrient is most often responsible for the yellowing of older leaves (chlorosis) in nitrogen-deficient plants?
Answer: Nitrogen
Nitrogen is a mobile nutrient that moves from older leaves to younger growth, causing older leaves to yellow first when deficient.
A fertilizer labeled 10-10-10 contains equal percentages of which three primary nutrients?
Answer: Nitrogen, Phosphorus, Potassium
The three numbers on a fertilizer label (N-P-K) represent the percentage by weight of nitrogen, phosphorus (as P2O5), and potassium (as K2O).
Which soil pH range generally maximizes nutrient availability for most landscape plants?
Answer: 5.5–6.5
A pH of 5.5–6.5 keeps most macro- and micronutrients in plant-available forms and is the optimum range for the majority of landscape species.
Iron deficiency interveinal chlorosis on young leaves is most commonly caused by which soil condition?
Answer: High soil pH
High soil pH (alkaline conditions) causes iron to precipitate into unavailable forms, resulting in interveinal chlorosis on new leaves.
Slow-release fertilizers benefit landscape plants primarily because they:
Answer: Reduce leaching and provide sustained nutrition
Slow-release fertilizers break down gradually, reducing nutrient leaching and providing a steady supply of nutrients over weeks or months.
Magnesium is considered a secondary macronutrient and is an essential component of which plant molecule?
Answer: Chlorophyll
Magnesium is the central atom in the chlorophyll molecule, making it critical for photosynthesis and green coloration.