A CULTIVATION METHOD FOR NASTURTIUM OFFICINALE (WATERCRESS) GROWN IN GREENHOUSE
Since watercress, on its natural site, preferably grows in a slowly flowing water stream, the first experiment was set up in a basin with water dammed up to 3 cm level, slowly flowing through the basin. During cultivation, a fluid fertilizer was applied as soon as required. For the second experiment, the pots were placed in a fertilizer solution dammed up to 2 cm level.
The harvested crop was assessed for its fresh weight, plant length and the degree of branching. The highest amount of fresh weight was measured for plants grown in the substrate-mixture TKS 1 with Humosoil, where the plants were branched and compact.
The rate of fresh weight of directly sown watercress increased with rising pot-size. Plants grown in big-sized pots produced thicker stems and higher nitrate levels, which made their quality worse compared to that of plants grown in small-sized pots.