ASSESSING GREY WATER FOOTPRINT OF CHRYSANTHEMUM CULTIVATED IN UPSTREAM AREA OF XUAN HUONG LAKE, DA LAT CITY

Abstract

This study was conducted to assess the grey water footprint and propose solutions to reduce the grey water footprint in chrysanthemum cultivation in the upstream area of ​​Xuan Huong Lake, Da Lat City. Based on the survey results of 27 hectares of chrysanthemum farming land in the study area and applying the methodology of the Water Footprint Network (WFN) to determine the grey water footprint, that caused by the use of fertilizer in the cultivation chrysanthemum process. The total calculated grey water footprint is about 946,26 m3/ton of product. Grey water footprints from fertilizer sources containing nitrogen account for 33% of the total grey water footprint, while this amount accounts for 67% from sources containing phosphorus. Good sustainable agricultural practices based on technical guidelines can reduce grey water footprints, reduce water pollution effectively. Specifically, grey water footprints caused by N can be reduced by about 30,34% and by P about 37,19%. The total grey water footprint can be cut is 330,70 m³/ton of product.