Authors:
A. N. MOISEEV,
candidate of agriculture sciences, engineer maintenance,
K. V. MOISEEVA,
candidate of agriculture sciences, associate professor, Northern Trans-Ural State Agricultural University (7 Republic Str., 625003, Tyumen)
Abstract. In spring wheat in the phase of full ripeness (before cleaning) showed the increase in all biological groups of weeds. The article presents the results of investigations on the weed infestation and productivity of grain and grass crop rotation. Field experiments were conducted in the Northern forest-steppe of the Tyumen region on the experimental field of Agrotechnology Institute 2006–2010 Northern Trans-Ural State Agricultural University, leached Chernozem. Analyzing the contamination of grain and grass crop rotation revealed that at tillering weed infestation of spring wheat made up 29.9 per PCs/m2, of which 10.5 PCs/m2 monocotyledonous weeds, 17.2 PCs/m2 young dicotyledonous weed plants and 2.2 PCs/m2 perennial weeds. Crop rotation was an increase in the number of weed plants (tillering stage) as monocotyledons and dicotyledons young to the fourth field — spring wheat 0.60 PCs/m2, 3.20 PCs/m2, respectively. Dry weight of weeds amounted to 22.1 g/m2 small dicotyledonous weeds and 15.8 g/m2 dicotyledonous perennial. Degree of clogging (at tillering) was 5.6 %, and before cleaning to 2.7 %, which is characterized by weak degree of clogging. In General, grain-grasses crop rotation reduce the weeds increasingly marked in the third field crop rotation in crops of winter rye for green forage was 7.4 PCs/m2 Yield of spring wheat in average years of research in the studied crop rotation amounted to 2.74 t/ha. It can be concluded that grain-grass crop rotation is less contamina- tion, due to positive agricultural technology assessment of winter rye in relation to the weeds.
Keywords: contamination, most of that dry weight of weeds, perennial grass weeds young, grain-grass crop rotation.
