Simulation of Herbicide Persistence in Soil
Simulation of Herbicide Persistence in Soil
Simulation of Herbicide Persistence in Soil
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56 A. Walker persistence o,.oI?t1964/3 r965/6ooo\.\oEoi z.oct966/ 76080t967/8tro0t20r40r50r80200Time ( weeks )Figure 7. PersistencFigure 6. <strong>Persistence</strong> <strong>of</strong> simaz<strong>in</strong>e <strong>in</strong> cropped plots. O, Observed; o, simulated; time 0:27 May 1964.WeeksafterDate Dose applisprayed(kg/ha) cation12.6.64 t.t2 085.8.64 0.56 07l42725.5.65 0. 84 0822.7 .65 0. 84 06l32l2835Table 2. <strong>Simulation</strong> <strong>of</strong> l<strong>in</strong>uron persistence <strong>in</strong> the cropped plotsResidue (ke/ha)Observed0. 700.420. 980. 700. 70.,:0.l40. 63Simulated.:0. 14 0. 380. 98 (0. 98)' l . 220.49 (0.57) 0.710.42 (0.35) 0.430.21 (0.24) 0.290.21 (0.18) 0.22