EFFECT OF THE MIXTURE OF CHARCOAL WITH PY ROLIGNEOUS ACID ON SHOOT AND ROOT-GROWTH OF SWEET-POTATO

To determine the effect of a mixture of charcoal with pyroligneous aci d (Sannekka E) on the growth of shoot and root in sweet potato, three experiments were carried out at the experimental farm of Miyazaki Univ ersity from 1995 to 1996. The number of roots, root length and root dr y weight of sweet potato seedlings were increased by soaking in a pyro ligneous acid solution. When the effects of Sannekka E on the growth o f sweet potatoes cultured in pots were examined, it was found that the application of Sannekka E promoted the growth of sweet potato root, i ncreased its activity, and promoted the absorption of nitrogen. In add ition, the application of Sannekka E promoted the rate of photosynthes is by increasing nitrogen and chlorophyll contents in leaf blade, and enlarged leaf area. As a result, top dry weight and tuberous root incr eased.