The experiment was carried out for in a greenhouse at the Soil and Fertilizer Research Institute (SFRI), in Hanoi, Vietnam.
during the experiment after each vegetative period. The amount of compost and vermicompost was calculated to be equivalent to applying 20 t ha−1 of organic substrate (90.5g), as recommended by the Soils and Fertilizers Research Institute (SFRI). Mineral fertilizers were urea (CH4 N 2O, % N = 46.3%), potash (K 2O, %K = 60%) and phosphate (P 2O5, %P = 16%).