Neco 2025 Agricultural Science Question 2

A soil moisture retention experiment is set up using a pressure plate apparatus as shown in the illustration. The apparatus consists of a sealed pressure chamber, a porous plate, a soil sample tube, a manometer and a pressure gauge. The soil sample is a 5 cm thick undisturbed core taken from a loamy field. The following data were recorded during the test: | Water potential (kPa) | Gravimetric water content (g g⁻¹) | |-----------------------|-----------------------------------| | -10 | 0.32 | | -33 | 0.24 | | -100 | 0.18 | | -300 | 0.12 | | -1500 | 0.07 | Answer the questions below: