The evaluation of different herbicide on weeds control, growth indices, and forage yield Alfalfa

Subject Areas : Journal of Plant Ecophysiology

masoud noroozi ¹ (ph.d student azad university of gorgan)
mohammad reza dadashi ² (azad gorgan)
fariba mighani ³ (Weed Research, Iranian Plant Protection)
hossien ajam noroozi ⁴ (azad university of gorgan)

Received: 2018-11-22 Accepted : 2020-09-04 Published : 2020-12-21

Keywords: leaf area index, Metribuzin, Imazethapyr, Fresh and Dry Weight of Alfalfa, Plant Burning,

Abstract :

Field experiment was conducted to evaluate chemical control of weeds in newly planted alfalfa with emphasis on growth indices in randomize complete-block design (RCBD) with 9 treatments and 4 replications at the research field of Iranian Research Institute of Plant Protection located in Meshkindasht, Karaj, during 2014-2016. The treatments consisted of Eradicane 4.1 g ai/ha, Metribuzin 525 g ai/ha, 2,4-DB 1269 g ai/ha, 2,4-DB 1480 g ai/ha, Bentazon 144 g ai/ha, Imazethapyr 50 g ai/ha (with 200 ml Sitogit), Imazethapyr 100 g ai/ha (with 200 ml Sitogit), non-herbicide control and whole-season weeding control. Based on reducing density of broad-leaved weeds the most effective herbicides were Metribuzin (99 and 97% in first and second cutting) and Imazethapyr 1 lit/ha (91 and 90% in first and second cutting). The poorest control was application of Eradicane (44 and 36 % in first and second cutting). Furthermore, the results of reducing density of grass weeds showed that among all herbicides the highest efficiency were related to Eradicane (100% in both cutting) and Imazethapyr 100 g ai/ha (87 and 91% in first and second cutting). the lowest fresh and dry weight of alfalfa, cumulative dry matter and leaf area index was related to use of Metribuzin, which was due to the effects of herbicide injury on alfalfa, thus it led to decreasing of alfalfa density in the first year

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