تاثير خاك ورزي در روز و شب بر سبز شدن علف هاي هرز در مزرعه

The effect of day aod night tillage 00 weed emergence

Photoblasticity of weeds seeds is a trait that can be explored to propose new control method s. Conducting tillage at night, thus preventing the photo induction of weed seed germination can be used as a means to reduce weed emergence. This study was conducted to assess the effects of day and night tillage at different dates during the growth season on weed emergence experimental design was randomized complete block with four replication . Tillage treatments consisted of day tillage-day disk, day tillage- night disk, night tillage- night disk and night tillage- day disk . Time of tillage was (6 February, 6 March. 6 April) . Four fixed quadrates were established in each plot where weed seedlings were counted at different times after field tillage . The night tillage reduced emergences of all weed species expect fox tail. The emergence of common lambsquarter (Chenopodium albomi, redroot pigweed (Amaranlhus retroflexusi, tutnsole(Chrozophora tinctoriai in night tillage treatment was 54%. 63%, 50% lower than that of day tillage. respectively. Tillage treatment had no significant effect on foxtail (Setaria species) emergence. Tillage treatment on February sixth significant increased weed emergence comparable to other two date of tillage . This could be a result of higher soil moisture content during February compare to March and April.