Cover crops in no-tillage crop rotations in eastern and western Kansas

摘要: Replacing fallow periods with cover crops can provide many benefits including soil quality improvements and reduced nitrogen fertilizer requirements. Field experiments were established near Garden City, KS winter wheat phases as main plots, thirteen legume or non-legume crops, continuous wheat, subplots, crop termination method sub-subplots. Treatments containing triticale had greatest water use efficiency (19.9 kg ha -1 mm ) aboveground biomass (3550 ), but subsequent yields due to a reduction in volumetric content. Increased residue through greater resulted increased precipitation storage during the period, requirements produce depleted moisture more than growing low fallow. In years of above-average precipitation, might be grown little no negative effect on yields. A second field experiment was Manhattan, fallow, double soybean, four treatments planted after harvest wheat-grain sorghumsoybean no-till cropping system, five applied sorghum estimate contribution crops. Greatest production accumulation observed sorghum-sudangrass. At 0 N rate, grain 1200 following sorghum-sudangrass, while all other provided 20-30 equivalent benefit. Sorghum large producing when is limiting, small benefit realized C:N ratio Cover productivity their effects performance evaluated studies Manhattan Hutchinson, 2008 2009. Sixteen summer fall species no-tillage stubble for production, concentration, accumulation. Summer annual grass produced biomass, 3392 greater, accumulated amounts nitrogen, averaging 43 . Grain 867 compared significant performance, 1240