Ефективність ґрунтового і післясходового гербіцидів на різних рівнях забур’яненості посівів кукурудзи

Abstract

Questions related to different mode-of-action herbicides at various pollution levels are almost ndiscovered.That is why during the four years (2009-2012) at the Yurjev Plant Production University was conducted the following double factor experiment. The pollution levels (factor A) were formed in a way of millet sowing under pre-sowing cultivation , estimating 1,3,5 millions of grains for a hectare. Factor B (herbicides) included the control (absence of herbicides) a soil drug Harnes ( Acetochlor) , a postemergence drug Milagro (Nikosulfuron) .The first herbicide , normally 25 litres/hectare was brought immediately after the maize crops , the second one , normally 1 litre/hectare in a phase 3-5 maize leaves . In average according to the pollution rate Harnes and Milagro were almost equally leading weeds to death: respectively to 78 and 74%. However the effectiveness of Milagro in reduction of weed plants mass was almost in 1.5 times higher : 80 against 55%. After increasing the pollution of the maize crops, some reduction of anti-weed Milagro activeness was noticed , in regard to Harnes the simmilar process was not observed. The maize harvest to grains, created by millet in amount 1,3 and 5 millions/hectare was reached respectively 1.84, 1,46 and 1,08 tonnes/hectare at the pollution rate . An average addition of the harvest in case with Harnes could reach 1,35 and with Milargo 2,18 tonnes/hectare. The herbicides at the pollution rate 1,3, 5 millions in average provided a growth of the harvest respectively 97, 118 and 172%. However estimating in the absolute quantity, increase of the harvest at diffrent pollution levels was almost the same and was held in the limits 1,72 -1,86 tonnes/ hectare.

Четырехлетними исследованиями установлены особенности действия почвенного и послевсходого гербицидов в условиях разных уровней засоренности посевов кукурузы

Чотирьохрічними дослідженнями встановлено особливості дії ґрунтового і післясходового гербіцидів в умовах різних рівнів забур’яненості посівів кукурудзи.