Abstract:
The research aims to study the effect of
sources and doses of potassium fertilizer on the resistance
and growth of tomato to bacterial wilt caused by
Ralstoniasolanacearum. We conduct experiment in a
screen house in Faculty of Agriculture, Islamic University
Malang. The research is conducted experimentally using
completely randomized block design (RAK) arranged in
factorial with three repetition. There are six combinations
of treatment. Factor I: source of potassium fertilizer,
consists of two levels: KCl and K2SO4. Factor II:dose of
K2O, consists of three levels: 50 kg ha-1
, 100 kg ha-1 and
200 kg ha-1
. The inoculation of Ralstonia solanacearum is
conducted a week after transplanting. There is significant
effect on the use of different sources and doses of
potassium fertilizer. As whole, the use of potassium
fertilizer originated from K2SO4 is better than that of KCl
and the magnitude of the increase depends on dose
applied. The best result indicates by treatment of the use
of K2SO4 with dose of 200 kg ha-1 K2O that able to extend
the incubation period of 6,27 days, decrease the attack
level of 73,15%, increase the uptake of potassium and
leaf chlorophyll of 4,58% and 7,17%, respectively,and
increase root lignin of 3%, whereas total phenol is
decreased of 27,27% compare to the use of KCl in the
same dose.
