Fundamental Physiological Processes II. Transpiration and Translocation

The perspiration and the translocation are fundamental physiological processes.

Transpiration consists of the loss of water in the form of vapour through the leaves; it is difficult to distinguish this process from evaporation from the soil, so the whole phenomenon is called evapotranspiration, which is driven by a moisture gradient, from the lower wetter zone (below 5.5 cm) to the shallower zone (first 5.5 cm). This transpired water allows the plant to cool down, but in situations of high relative humidity or high values of VWC this gradient does not occur, so there is no cooling of the plant and the "canopy temperature" or leaf temperature increases considerably, even though the outside temperature does not change. Hence the fact that the temperature we measure is the canopy temperature, in order to be able to measure the level of thermal stress of our greens.

Translocation is the movement of compounds from outside to inside the turf, and movement within its system. Thus, when we apply iron The greenish foliar colouring of our greens is the result of this translocation to the chlorophyll molecules.

Transpiration and translocation processes are at their best when the air/water balances are correct. Likewise, excessive VWC or high relative humidity during periods of high temperatures increase the thermal stress of our greens due to the impossibility of the transpiration process.

Studies conducted by Stevens reveal that the 85% of the VWC and the VWC measures ECThe first 6 cm of the profile of the green, which is why this is the priority area to monitor.