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The effects of planting density and N fertilizer rate on fresh yield of `Long Island Mammoth' dill (Anethum graveolens L.) were evaluated using a split plot design. Planting density (one versus two row beds) was the main plot treatment and N rate, the subplot treatment. High, medium and low N rates were 0, 56 and 112 kg/ha in 1990, but 28, 56 and 112 kg/ha in 1992, respectively. P and K were applied at rates of 59 and 111 kg/ha, respectively. In 1990 yields increased as N rate increased. In 1992 the medium N rate produced greater yields than did the high rate, but yields from plots receiving the low N rate did not differ from those receiving other treatments. Planting density did not significantly affect yield in either year. In a second study four, cultivars (`Bouquet', `Crown', `Long Island Mammoth' and `Tetra') were evaluated in 1990 using a randomized complete block design with N applied at 56 kg/ha. `Dukat' and `Fernleaf were added in 1992. Cultivar yields differed only in 1992 when `Long Island Mammoth' outyielded `Crown' and `Fernleaf'.
A three year study was conducted in which fall-planted cover crops of hairy vetch, Austrian winter pea and crimson clover were each followed by spring-planted `Sundance' summer squash and `Dasher' cucumber. Squash and cucumber crops were followed by fall `Florida Broadleaf' mustard green and `Vates' collard, respectively. The same vegetable sequences were also planted without benefit of cover crop. Three nitrogen (N) rates were applied to each vegetable crop. Biomass and resulting N contribution of Austrian winter pea were inconsistent when compared to the other covers. Spring vegetables following crimson clover generally outyielded vegetables in the other sequences. Effects of cover on fall crops were greatest during the third year when vegetable yields following clover again exceeded yields from other sequences. Elimination of N fertilizer resulted in reduced yields for all crops, but yields of crops receiving one-half the recommended N rate were generally comparable to those receiving the full rate.