Amarasekara, M. G. T. S.; Kumarihamy, R. M. K.; … - International Water Management Institute (IWMI) - 2010
plots also recorded high levels of phosphorous (P) (above 75 ppm). Results of the water quality analysis showed that nitrate … and available P levels were within the standard limits, but nitrate nitrogen (NO3-N) levels were close to the upper level …