Synopsis
Nitrogen fertilizer applied at time of seeding influenced the percentage of emergence of all species in each seeding in proportion to the amount of nitrogen applied. In two experiments significant reductions in stands resulted. Seedling weights 28 days after emergence were not influenced by nitrogen fertilization; 56 days after emergence seedling weights were increased by higher nitrogen rates. Yields were usually depressed. Red clover and Ladino clover were depressed more than alfalfa and birdsfoot trefoil.
Vegetatively propagated dallisgrass (Paspalum dilatatum Poir.) plants of a single clone were grown in the greenhouse and cut to a stubble height of 2.5‐ or 7.5‐cm in a factorial combination of leaving 0, 10, 20, or 30% intact tillers. Higher daily and total regrowth yields resulted from decreasing the height of cut or leaving intact tillers. Total available carbohydrates increased as height of cut and percent intact tillers increased. Translocation of carbohydrates from intact tillers to new growth was demonstrated by treating the uncut tillers with C14 sucrose, glucose, and fructose, and following their movement at various time intervals with autoradiographs. Apparently 10% more intact tillers are sufficient for dallisgrass survival and growth under intensities of defoliation used in these studies.
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