Impact of Some Pre- and Post-Emergent Herbicides Applied to the Chickpea Crop (Cicer arietinum L.)

Abstract

Because of its drought resistance, chickpea cultivation tends to become increasingly widespread in the current climate change context. The chickpea crop is easily taken over by weeds in the early growing season, as it has a slow growth rate and the plant does not have an imposing stature. This paper focuses on the importance and the main purpose of weeds control in chickpea crop in order to achieve a high increasing yield. The objectives during two years aimed at assessing the degree of selectivity and the efficacy of some simple, complex or associated herbicides, applied pre-emergently and post-emergently. The sample in chickpea crop consisted of pre-emergence application of aclonifen 600 g/l at a rate of 4 l/ha, s-metolachlor 960 g/l at a rate of 1.5 l/ha, isoxaflutole 240 g/l + cyprosulfamide 240 g/l at a rate of 0.25 l/ha, s-metalochlor 312.5 g/l + terbuthylazine 187. 5 g/l at a rate of 4.5 l/ha and in post-emergence application of isoxaflutole 240 g/l + cyprosulfamide 240 g/l at a rate of 0.18 l/ha, pyridate 450 g/kg at a rate of 1.2 kg/ha, quizalofop-p-tefuryl 40 g/l at a rate of 1 l/ha, 40 g/l, imazamox 40 g/l at a rate of 0.8 l/ha. Chickpea crop was infested by a large number of weeds, as well perennial dicotyledonous species hard to control like: Convolvulus arvensis, Cirsium arvense, Sonchus arvensis etc. The best weeds control was obtained when preemergently applied herbicides were followed by those postemergently applied. Perennial dicotyledonous species weren`t sufficiently controlled in any variant. Phytotoxicity symptoms were recorded at herbicide imazamox, 40 g/l, applied in post-emergence, which delayed the harvest and provided low yields.