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Tissue cultured `Heritage' raspberry plants were planted in April 1990. Split applications of ammonium nitrate were made to 0.6 m widths on each side of the row at total rates of 0, 22, 45, 90, or 180 kg/ha. Applications were made in May and August in 1990 and in March and July in 1991. The plants were cut to ground level during the winter. In 1990, cane length and number of buds on the central cane were unaltered by N treatment, but all N treatments resulted in the development of more canes than the control and thus more total length of cane growth. Date of 50% accumulated yield was advanced and total yield increased with added N. Foliar N contents (2.35%) of the two highest rates were greater (3 weeks after the second application) than the control (2.12%). In 1991, early yield was slightly delayed by N. Total yield was reduced by the highest N rate. The 45 kg/ha N treatment had the highest yield of 2.53 t/ha. Plants receiving 180 kg/ha had greater foliar N content in June and October than control plants. Soil samples were taken to 30 cm on June 29, 1991. About 80% of the nitrate-N was found in the top 15 cm.
Tomatoes and sweet corn grew and produced equally well under no-tillage and conventional tillage methods in 1989. Simulated rainfall was applied through an overhead irrigation system four times during the growing period with 2.8 cm of water applied during each event. Total solids in collected runoff water were higher with conventional tillage than with no-tillage. Residue levels of atrazine, metolachlor, mancozeb, esfenvalerate, metribuzin, and metalaxyl and concentrations of N, P, and K in runoff water were determined and varied with runoff event, pesticide, nutrient, crop, and tillage method.