Answer:
The best conclusion on the basis of the result is that the student who had hand watered the plants and had talked to one group of the plants demonstrated much better growth, however, this is not because the student talked with them, it is generally because they were hand watered.
The hand watered plants showed better growths as they exhibited enough supply of water required for their growth and development. On the other hand, with the application of sprinklers, the adequate supply of water cannot get fulfilled.
There would be various areas remained where the water would not have reached with the use of sprinklers, and at certain locations, there would have been chances of waterlogging due to which death of plants may also take place.