Impact of some herbicides, herbicide combinations and herbicide tank mixtures on sowing characteristics of winter forage pea (Pisum sativum L.)

Grozi Delchev

Trakya University, Faculty of Agriculture, Studentski grad, 6000 Stara Zagora, Bulgaria

Delchev, G. (2020) Impact of some herbicides, herbicide combinations and herbicide tank mixtures on sowing characteristics of winter forage pea (Pisum sativum L.). Bulg. J. Agric. Sci., 26 (Suppl. 1), 3-8

TThe research was conducted during 2015 - 2017 on pellic vertisol soil type. Under investigation was Bulgarian winter forage pea cultivar Mir (Pisum sativum var. arvense). Factor A included 3 rates: untreated control and 2 soil-applied herbicides – Dual gold 960 EC (S-metolachlor) - 1.5 l.ha-1, Stomp aqua (pendimethalin) - 5 l.ha-1. Factor B included 8 rates: untreated control, 5 foliar-applied herbicides – Basagran 480 CL (bentazone) - 2 l.ha-1, Pulsar 40 (imazamox) - 1.2 l.ha-1, Korum (bentazone + imazamox) - 1.25 l.ha-1, Zencor 70 WG (metribuzine) - 500 g.ha-1, Maton 600 EK (2.4-D ethylhexyl ester) – 1 l.ha-1 and 2 herbicide tank mixtures – Zencor 70 WG (metribuzine) – 500 g.ha-1 + Targa super 5 EC (quizalofop-P-ethyl) - 2 l.ha-1, Maton 600 EK (2.4-D ethylhexyl ester) – 1 l.ha-1 + Targa super 5 EC (quizalofop-P-ethyl) – 1 l.ha-1. Soil-applied herbicides were applied during the period after sowing before emergence. Foliar-applied herbicides were applied during 2 - 3 real leaf stage of the pea. All of herbicides, herbicide combinations and herbicide tank-mixtures were applied in a working solution of 200 l.ha-1. Mixing of foliar-applied herbicides was done in the tank on the sprayer. Foliar-applied herbicides Zencor and Maton and herbicide tank mixtures Zencor + Targa super and Maton + Targa super were proven to decrease germination energy of the winter forage pea seeds. Laboratory seed germination was proven to decrease by herbicide Maton and herbicide tank mixture Maton + Targa super only. Lengths of primary germ and primary root are decreased by herbicides Zencor and Maton and herbicide tank mixtures Zencor + Targa super and Maton + Targa super. Foliar-applied herbicides Basagran, Pulsar and Korum as well as their combinations with soil-applied herbicides Dual gold and Stomp aqua, were proven to decrease waste grain quantities. The highest yields of winter forage pea seeds were obtained by treatment with foliar-applied herbicide Korum after soil-applied herbicides Stomp aqua and Dual gold. High yields were obtained also by treatment with foliar-applied herbicide Pulsar after soil-applied herbicides Stomp aqua and Dual gold, as well as by foliar treatment with herbicide tank-mixture Zencor + Targa super after soil-applied herbicides Stomp aqua and Dual gold.

Keywords: winter forage pea; herbicides; herbicide combinations; seed yield; sowing characteristics

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