A research team is studying the effects of three different fertilizers (X, Y, and
Z) on the
growth of a specific plant species. They have four experimental plots with different
fertilizer combinations:
- Plot 1: Fertilizer X only
- Plot 2: Fertilizer Y only
- Plot 3: Fertilizer X and Fertilizer Z only
- Plot 4: Fertilizer Y and Fertilizer Z only
After a period of observation, they note the following:
- Plants in plots with Fertilizer X showed significantly increased height compared to a
control group (no fertilizer).
- Plants in plots with Fertilizer Y showed a slightly increased leaf area compared to the
control group.
- Plants in Plot 3 (X and Z) showed no significant difference in height compared to the
control group.
- Plants in Plot 4 (Y and Z) showed significantly increased height compared to the control
group.
Based on these observations, which of the following conclusions is best supported?