EFFECT OF MONOCROTOPHOS CHLORPYRIFOS ALONE AND IN COMBINATION WITH MANCOZEB AND CARBENDAZIM ON UREASE ACTIVITY IN GROUNDNUT (ARACHIS HYPOGAEA L.) SOILM. Srinivasulu, M. Madakka, G. Jaffer Mohiddin and V. RangaswamyAbstract A laboratory experiment was conducted to study the effect of the monocrotophos, chlorpyrifos alone and in combination with mancozeb and carbendazim in two soils, collected from a fallow groundnut (Arachis hypogaea L.) field. The activity of urease, in terms of ammonia formed from urea was more pronounced in soil samples treated with 2.5 kg ha-1 and 5.0 kg ha-1 of the monocrotophos alone and in combination with mancozeb, and chlorpyrifos alone and in combination with carbendazim respectively, but at higher concentrations of 7.5 and 10 kg ha-1 were toxic to urease activity. Where as the activity of urease was higher in red soil, received the monocrotophos in combination with mancozeb at 5.0 kg ha-1 and chlorpyrifos in combination with carbendazim at 2.5 kg ha-1 in black soil, incubated for 20 days. The enzyme activity was drastically decreased on prolonged period of incubation up to 30 and 40 days.
Enter your contact information below to receive full paper.
|