作者: J. J. Mullahey , S. S. Waller , L. E. Moser
DOI: 10.2307/4002352
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摘要: Response of key warm-season grasses to time, frequency, and duration defoliation is needed develop grazing systems for the Nebraska Sandhills. A 3- year (1986 1988) study was conducted on a Valentine fine sand (mixed, mesic Typic Ustipsamments) at Gudmundsen Sandhills Laboratory near Whitman, Nebraska, determine effect little bluestem [Schu 2 defoliations 10 June Aug.; 3 June, July, Aug. Control plants were huvested only end growing season (October). All plots receiving summer harvested in October obtain aftermath yield. Treatments initiated 1986,1987, 1988 effects l,2, years dry matter (DM) yield, bud tiller numbers, weight measured. Experimental design split block with 4 as replications. In first yeu treatment annual DM yield from control times greater than that all defoliated plants, but numbers similar. second treatment, treatments reduced morphological development below if precipitation subnonnal, not above normal. third defoliation, above-nonnd precipitation, single or July produced yields similar control, August multiple generally md development. Little may persist exposed multiple, close defolitions during season.