In Ryazan region edaphoclimatic conditions allow to obtain stable yield of corn more than 19841,6 pounds of grain per hectare. Investigators consider that increasing of corn yield by 50% depends on availability of plant food compounds and pest, disease and weeds protection, by 25% from soil tillage quality and by 25% from varietal features of cultivated crop and hybrids. Weeds in the wide-row planting during the active vegetation period compete with crop for nutrients and moisture reserve in the soil. As a result of the institute multi-year research the average loss of corn yield from weeds without protection measurements is 30-50 %. The results of two-year field tests on the study of the herbicide usage effectiveness after corn germination are presented, to reduce the weed infestation of sowing and increase yields. The researches were carried out in the OOO “Svet”, Ryazhskiy district, Ryazan region. The soil is leached chernozem, the content of the humus is 5.2%, potassium and phosphorus- average, pH-6.0. The area of cultivated plot is 10.0 ha, control plot –0.2 ha, record plot – 107.64 sq. ft, number of replication – 4. The corn variety is Klarissa, sowing rate is 55.12 pounds per hectare, forecrop is winter wheat. Agricultural practices in the experience is application of 220.46 nitrophoska pound per hectare, 440.93 pounds per hectare of the ammonia nitrate, harrowing of the autumn plowing, cultivation, seeding with precision seeder. For weed protection of the corn seedlings in 2016 was applied herbicides tank mixture; Egida-48%, VDG (AVG – 0193)– 0.55 pound/ha + Dublon – 4%, SK – 0.26 gal/ha and factory product Elyumis – 10.5%, MD – 1.32 hal/hа, in 2017 – Egida tank mixture, VDG – 0.44 pound/ha + Dublon, SK – 0.26hal/ha and Elyumis, MD – 0.26 hal/ha. It was found that the studied herbicides effectively reduced the weed infestation of crops and increased the yield of grain maize by 7936.64-12786.8 pound / ha.
