Forrest Recreation Exam 2 Practice Test

N-P-K labeling on fertilizer reflects the three main nutrients plants need in the largest amounts. Nitrogen supports leafy growth and a healthy, green color; phosphorus is key for root development, flowering, and energy transfer within the plant; potassium helps overall vigor, water regulation, and stress resistance. Fertilizer bags show these three nutrients as percentages by weight, giving you a quick sense of the mix. The letters themselves stand for nitrogen, phosphorus, and potassium. The other options mix elements not represented in this standard trio, like carbon, oxygen, or secondary nutrients such as calcium.