Lysimeters are special devices used to quantify different aspects of the water cycle in a given experimental field setup. They are particularly used in agricultural and hydrological studies to measure the following processes:

1. Evapotranspiration: This is the combined process of evaporation (water movement from soil and plant surfaces to the atmosphere) and transpiration (water movement from within plants to the atmosphere through stomata). Lysimeters are designed to measure the total amount of water lost to the atmosphere from a vegetated surface, thus helping researchers understand the water requirements and usage of crops.
2. Deep Percolation: Deep percolation refers to the movement of water down through the soil beyond the root zone to the groundwater. Lysimeters can measure the amount of water leaving the lysimeter at the bottom, which corresponds to the volume of water percolating deep enough to recharge groundwater resources.

Both these processes provide crucial data for water balance studies, irrigation management, and understanding the hydrological impact of different agronomic practices.

While lysimeters can also indirectly provide insights into infiltration (as it is the initial entry of water into the soil which then contributes to percolation or evapotranspiration), they are not primarily used to measure infiltration or evaporation alone. Instead, these are assessed through complementary methods and instruments.

Hence, the correct answer is:

• Evapotranspiration
• Deep Percolation