Studeis on Persistence and Degradation of Propineb and Its Effect on Zinc Content in Rice
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Date
2008-02
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A laboratory and two field experiments were conducted in order to determine the
persistence and degradation of propineb in soils, rice and its effect on zinc content in rice.
Persistence of Propineb was studied in Shimoga and Mandya soils at the application rate
of 10 and 25 pg g"1. The degradation pattern of Propineb in soils followed the first order
reaction kinetics and was faster in initial period of incubation and later slower
degradation. Degradation of Propineb was faster under field capacity moisture regimes
than submergence. Higher persistence of Propineb was noticed in Shimoga soil than
Mandya soil at both the application rates and moisture regimes. The half life values
ranged from 5.2 to 5.3 days in Mandya soil and from 6 to 9.6 days in Shimoga soil
following application at 10 and 25 pg g"1 under field capacity. It ranged from 6.7 to 7.7
days and 10 to 12.1 days in Mandya and Shimoga soil under submerged moisture
regimes.
Propineb residues dissipated faster in rice when applied at 700 and 1400 g a.i.
ha-1on 20 or 30 days after transplanting. Dissipation was faster at lower dose than higher
dose of application. The rate of degradation of propineb residues was higher when
applied at 30 days after transplanting (DAT) as compared to 20 DAT. The half-life values
varied according to the difference in time of application irrespective of rate of
application. Half-life values of propineb when applied at 20 DAT ranged from 1.96 to
2.29 days and from 1.25 to 1.59 days when applied at 30 DAT.
There was a significant increase in grain and straw yield over control in
the application of zinc based fungicide and fertilizers. Although no significant
difference in zinc content was observed, there was a significant difference in zinc
uptake by grain and straw among different treatments.
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