STUDIES ON PERSISTENCE AND DEGRADATION OF PROPINEB IN SOILS AND ITS EFFECT AS A SOURCE OF ZINC FOR POTATO
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Date
2009-07-02
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University of Agricultural Sciences GKVK, Bangalore
Abstract
A field and laboratory experiments were conducted to determine
the persistence and degradation of propineb in soils and its effect as a
source of zinc for potato. Propineb residue degraded faster in potato
under field condition when applied at 1400 and 2800 g a.i ha*1. However,
the propineb was noticed in soil on the day of propineb spray.
Degradation was faster at lower dose than higher dose of application with
the half-life values of 2.3 and 2.5 days. The safe waiting period of 3.3 and
4.3 days was recommended for potato when applied at 1400 and 2800 g
a.i ha-1 of propineb.
Among the fungicide and among fertilizers, the higher potato tuber
yield was recorded in 1400 g a.i ha-1 with B:C ratio of 4.4 compared to
other treatments. The zinc content of potato leaves and potato tuber was
higher in 2800 g a.i ha*1 of propineb followed by 1400 g a.i ha'1 of
propineb, 1400 g a.i ha-1 of metiram, 1850 g a.i ha-1 of Zn-EDTA, 0.2 %
ZnS0 4 .7 H2 0 and 20 kg ha*1 ZnS04.7H20 compared to control.
Persistence and degradation was studied in Malur and Hassan
soils at 25 and 50 Mg g '1 with field capacity and half-field capacity
moisture regimes. The degradation pattern followed the first order
kinetics. Degradation of propineb was faster under filed capacity than
half-field capacity moisture regimes at both rates in both the soils.
Higher degradation was noticed in Malur soil than Hassan soil at both
the rates of application and moisture regimes. The half-life values ranged
from 6.5 to 7.1 days for Malur soil and 6.9 to 7.1 days for Hassan soil
when applied at 25 and 50 |ig g*1 of propineb under field capacity. Under
half-field capacity the half-life ranged from 7.1 to 7.9 days for Malur soil
and 9.2 and 9.8 days when applied at 25 and 50 jig g-1 of propineb.
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