Influence of tillage systems, winter rye, and preemergence herbicides on pumpkin yield

摘要

'Wheeler' winter rye or no cover crop along with various herbicide treatments were compared for influence on weed control in tillage and no-tillage pumpkin production, and compared to the standard tillage production system with a mixture of ethalfluralin + clomazone. The study was conducted on an Ebbert silt loam with 1.6 percent organic matter and pH 6.1 at the Belleville Research Center. Fertilizer applied was 50, 50 and 150 lb/A N, P_2O_5 and K_2O, respectively, prior to planting with an additional 50 lb N/A applied 4 weeks after planting. The area had been cropped to pumpkin in 2001. A blanket application of glyphosate at 2.0 percent v/v was applied to all plots on June 1, followed by rolling on June 12. Tilled plots were tilled on June 15. 'Applachian' pumpkin was planted 0.5 inch deep, in 48 inch rows, spaced 48 inch within the row on June 18. Plots consisted of one row 20 ft long arranged in a split-split-plot design with 3 replications. Main plots were either tilled or no-till, sub-plotswere either 'Wheeler' winter rye cover crop or no cover crop, and sub-sub-plots were herbicide treatment. The herbicides were broadcast applied with a CO2 pressurized sprayer using 8002 flat fan tips at 40 PSI in 20 GPA water. Monthly rainfall in incheswas 4.9, 6.6, 1.7, 3.7 and 3.6 in April, May, June, July and August, respectively. Total rainfall for the 28 days following planting was < 0.1 inch. Weed population per 0.25 m~2 in the nontreated plots, mid-season, was 50+ redroot pigweed and common waterhemp.