59. Jahrestagung der
Gesellschaft für Pflanzenbauwissenschaften e. V.
27. bis 29. September 2016
Gießen
Klimawandel und Qualität
Kurzfassungen der Vorträge und Poster
Herausgeber:
H. Kage, K. Sieling
und L. Francke-Weltmann
Gesellschaft für Pflanzenbauwissenschaften e. V.
Mitt. Ges. Pflanzenbauwiss. 28: 220–221 (2016)
Postersektion 4: Leguminosen
Effects of herbicides and biofertilizer (
Bradyrhizobium japonicum
)
on weed control and soybean yield
Yazdan Vaziritabar, Yavar Vaziritabar, Bernd Honermeier1, Farzad Paknejad2 and Javad Angaji3
1
Justus-Liebig-University Giessen, Institute of Agronomy and Plant Breeding I, BFS (Biomedical Research Centre Seltersberg), Schubertstr. 81, D-35392 Giessen, Germany.
2
Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran.
3
Department of Agronomy, Science and Research Branch of Tehran, Islamic Azad University, Tehran,
Iran. E-Mail: yazdan.vaziritabar@agrar.uni-giessen.de
Introduction
Soybean (Glycine max. (L.) Merr.) is cultivated in Iran on around 70.000 ha reaching grain yields of about 2.4 t/ha. Because of low competition capacity during the juvenile development stage soybean plant stand can be characterized as sensitive to weed infestation. Weeds compete for water and nutrient uptake that may inhibit the growth and development of the soybean crop. That may modify the soybean canopy like plant height and number of sub branches and finally reduce the grain yields. Two of the most important weeds on soybean fields in Iran are Xanthium strumarium L. and
Datura stramonium L. which can decrease soybean yield by around 70%. Beside weed control the N2 fixation is crucial for soybean growth and development as well.
The aim of this research was to investigate the interaction of selected herbicides used in soybean in Iran and bio-fertilizer (Bradyrhizobium japonicum) on weed control and grain yield in soybean plant stand.
Material and method
The field experiment was conducted in 2012 as randomized complete block design (RCBD) arrangement on fields of the research station belonging to the Faculty of Agriculture of the Islamic Azad University in Karaj, Iran. The station (50°57´E, 35°34´N, altitude 1261 m) is characterized by an annual mean air temperature of 16.2°C and mean precipitation of 260 mm per year for the past 30 years. Two factors (1) the application of bio-fertilizer (with and without) and (2) application of herbicides including control (weedy check) were arranged as main treatment. The herbicides as sub-treatments consisted of trifluralin, ethalfluralin, metribuzine, oxyflorfen, bentazon, and aciflourfen+bentazon. Weed density and biomass were determined by using quadrates 0.5 m2 in two points of each plot randomly, which declares total weeds of the plot.
Results and discussion
221
Postersektion 4: Leguminosen
Fig. 1: Effect of different herbicides and bio-fertilizer on weed control and grain yield in soybean in a field experiment, Karaj 2012 (Iran)
Caused by effective weed control the herbicides aciflourfen plus bentazon led to highest grain yield of soybean with significant difference to the control (fig. 1). Conversely, metribuzine and oxyflorfen had a limited effect caused by weak control of Xanthium spinosum. The used bio-fertilizer Bradyrhizobium japonicum had no clear influence on the soybean plant stand and grain yield.
The current data confirm the importance of the use of suitable and selective herbicides in cultivation of soybean plants to protect them against weed infestation. In the present study no advantage of bio-fertilizer regarding soybean growth could be found. It is suggested that the population of naturally occuring soil rhizobia is sufficient for necessary symbiosis with soybean host crop.
