Naslov
Effects of pre-and post-emergence weed control on weed population and maize yield in different tillage systems

Autori
Knežević, Mira ; Đurkić, Marija ; Knežević, Ivan ; Lončarić, Zdenko

Izvornik
Plant, Soil and Environment (1214-1178) 49 (2003); 223-229

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Atrazine ; metolachlor ; sulfonylureas ; sulcotrione ; bromoxynil ; tillage ; weed density ; weed control ; maize yield

Sažetak
The effect of chemical weed control with reduced herbicide rates (pre-em., pre-em.+ post-em., post-em) on weed population density and maize yield was compared in three tillage systems (mouldboard, chisel, disk harrowing) for lessive pseudogleic soil in north-eastern Croatia (1997-99). These main weeds were present in all tillage variants: Echinochloa crus-galli (L.) PB., Chenopodium album L., Ambrosia artemisiifolia L., Polygonum lapathifolium L., Equisetum arvense L. and Calystegia sepium (L.) R.Br. The density of total weeds was significantly affected by tillage and it ranged from 204 plants on untreated plots with mouldboard to 372 and 421 plants m-2 with chisel ploughing and disk harrowing, respectively. In comparison with standard tank-mixture of atrazine herbicide (metolachlor 50% & atrazine 20%) at the recommended rate, atrazine-free herbicide combinations (metolachlor + 50% prosulfuron & 30% primisulfuron-methyl ; sulcotrione + bromoxynil ; thifensulfuron-methyl + nicosulfuron), showed a similar total efficacy of weed control (95-96%). Band spraying with standard treatment at half-recommended rate combined with mechanical weed control, brought a satisfactory total weed reduction (83-87%). The weed control methods had no impact on maize yields that were significantly affected by year and tillage. Compared to the highest yield with mouldboard ploughing (10.2 t/ha), average percent yield depressions with chisel ploughing and disk harrowing were 10 and 22%, respectively.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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