Which of the following is not an advantage of hydroponics?
A. Plant nutrition is completely controlled through prepared nutrient solutions.
B. Yield per unit area is reduced since plants may be planted closer together.
C. Roots do not spread as much because H2O and nutrients are pumped directly to the plant.
D. The need for weed, disease, and insect control is greatly reduced due to the absence of soil.
Answer: B. Yield per unit area is reduced since plants may be planted closer together.