COMPARISON OF DIFFERENT METHODS TO EXTRACT SOIL-WATER FROM CONTAINERIZED SUBSTRATES
The purpose of this research was to use low tension lysimeters (Porous Cups - PC) to extract nutrient solution or soil-water from containers without disturbing plants. PC is a quick and easy nutrient sampling technique to use in greenhouses that could help growers to prevent nutritional problems. In previous research PC have usually been used to monitor nitrate and or other nutrient leaching in the open field with bare soil or cover crops. This research has focused on sampling nutrient solution of containerized substrates. Studies were conducted comparing PC method with PourThru (PT), Saturated Media Extract (SME) and 1:2 method (adapted from Dole and Wilkins, 1999). Calibration curves were calculated in order to compare/convert PC and PT values. Correlation coefficients were 0.845, 0.813 and 0.832 for N, P and K respectively. The good correlations between the two extraction procedures indicate that PC can be a good substitute of PT and so a reliable method for monitoring substrate nutrients without disturbing plants. PC provide a simple and direct method to collect water samples in the unsaturated zone helping to monitor the nutrient status of the crop.
Sambo, P., Zanin, G., Nicoletto , C., Roncolato, F. and Evans, M.R. (2011). COMPARISON OF DIFFERENT METHODS TO EXTRACT SOIL-WATER FROM CONTAINERIZED SUBSTRATES. Acta Hortic. 922, 369-374
porous cup, suction lysimeter, nitrogen leaching, PourThru, soil-water