Kaalikasvien glukosinolaatit rikkakasvien torjunnassa

Abstract

Crucifer plant tissues are assumed to be a feasible alternative to synthetic compounds in plant protection. I compared the effect of volatiles and incorporated tissues of Brassica juncea and Sinapis alba against weeds in laboratory, glasshouse and under field conditions. Volatiles from crushed leaves of B. juncea strongly reduced the emergence and root elongation of Tripleurospermum inodorum in agar-plates, whereas volatiles from S. alba had only a little effect. However, incorporation of dried S. alba leaves or seed meal (1% w/w) into pot soil inhibited emergence and growth of T. inodorum and Pisum sativum much more than B. juncea. At 2-leaf stage of test plants also S. alba was only slightly phytotoxic. Under field conditions S. alba seed meal controlled annual weeds adequately but was strongly phytotoxic to peas when it was incorporated into soil after the emergence of pea. B. juncea seed meal didn`t have any inhibiting effect on plants. I suppose that the most effective compounds from S. alba are in liquid phase in soil. Practicability of crucifer tissues for weed control is discussed.