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Influence of application rate and manure amendment on cnloridazon dissipation in the soil
Author(s) -
ROUCHAUD J.,
NEUS O.,
HERMANN O.
Publication year - 1997
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1046/j.1365-3180.1997.d01-20.x
Subject(s) - amendment , sugar beet , sowing , manure , chemistry , soil water , zoology , gas chromatography , soil test , horticulture , agronomy , environmental science , chromatography , biology , soil science , political science , law
Summary Plots of a sugar beet field in Belgium were treated pre‐emergence with 1.3, 1.95 or 2.6 kg a.i. ha ‐1 chloridazon. Some of these plots had been amended 1 month before sowing with 50 1 ha ‐1 cow manure. Soil samples were taken al regular intervals and analysed by gas‐liquid chromatography and gas‐liquid chromatography combined with mass spectrometry. During the first month following chloridazon application, soil dissipation followed apparent first‐order kinetics with soil half‐lives being independent of the dose, and were 37 days in the non‐manured plots and 96 days in the manured plots. After the first month, rates of chloridazon soil dissipation increased, giving the same residual chloridazon soil concentration of c. 0.25 mg a.i, kg ‐1 in all plots 1.8 months after application. Residual levels remained at this concentration up to the third month after application, and then disappeared, leaving no delectable soil residues at harvest. Chloridazon soil dissipation thus occurred according to unusual kinetics.