Use of reduced Bokashi doses is similar to NPK fertilization in iceberg lettuce production

The aim of the study was to compare horticultural variables iceberg lettuce using two Bokashi compost doses, alone and in combination, with bioactivator Penergetic (Penergetic International AG®) against standard mineral fertilization (NPK) three crop cycles. Experiments were conducted a plastic greenhouse at Universidade Estadual de Londrina, Brazil (548 m a.s.l.). treatments were: negative control (water, only); positive (NPK, 4-14-8); alone; doses 5 g 10 g/plant or without combination Penergetic. Lettuce plants grown pots filled soil. Commercial biomass (CM), head diameter (HD), plant height (PH) chlorophyll index (CI) evaluated. In cycles tested, g/plant, + Penergetic, NPK surpassed control. studied (CM, HD, PH CI) lower dose treatment also higher than controls but NPK. increases CM just first production cycle, probably due poor organic matter content improved significantly vs. similar chemical