Effects of biofertilizers inoculation on quantitative and qualitative characteristics of two wheat genotypes in rotation with alfalfa

In order to evaluate the effects of biological fertilizers and crop rotation on yield and the yield components of wheat (Triticum aestivum L.), an experiment was conducted as a split-plot factorial arrangement based on a randomized complete block design, with three replications, in the field during the 2010-2011 growing season. Two crop rotations as alfalfa-wheat and fallow-wheat were assigned to the main plots. Two wheat varieties (Falat and Parsi) and biological fertilizer at four levels, including Nitroxin, Mycorrhizal fungi and Nitroxin+ Mycorrhizal together, and with a control were randomized in subplots. Growth indices, the number of tillers, yield and yield components and the grain glutenin content of wheat were recorded. Results showed that in the wheat-alfalfa rotation all studied traits except the harvest index increased. Parsi increased in plant height and grain yield more than Falat, but seed glutenin content in both varieties was the same. Biological fertilizers increased the leaf area index, dry matter accumulation and crop growth rate. Also, the impact of biological fertilizers on the chlorophyll meter reading, grain yield, grain number per spike and glutenin content of wheat were significant. In contrast, the effects of biological fertilizers on plant height, number of fertile tillers, dry matter yield and straw yield were not significant. The maximum yield was gained with 435 g m-2 in the alfalfa-wheat rotation, Parsi variety and Nitroxin+Mycorrhizal fertilizer.