posted on December 21, 2010 11:59
On July 12, zucchini were direct seeded into a field at the Southwest Purdue Agricultural Center in Vincennes, Indiana, which was managed for the fifth consecutive year organically. Individual row plots consisted of 30-ft rows on 6-ft centers. Zucchinis were planted 3.0-ft apart with 10 plants per plot. Each row was mulched with 4-ft wide x 0.16 in. black plastic (Visqueen 4020). The experimental design was a randomized complete block with four replications. Treatment plots were separated in the row by 10-ft unplanted buffers. OMRI (Organic Materials Research Institute) listed fungicides were applied weekly from July 22 to August 31 with a CO2 backpack sprayer with 4 flat fan nozzles Tee-Jet 8002VS spaced 19 inches apart applying 10 gal per acre at 30 psi. The plots were examined for symptoms of disease on August 20, 27 and September 3 using the Horsfall-Barratt ratings system. Zucchini were harvested on August 19, 20, 23, 25, 27, 30 and September 1. Rainfall totals for June, July and August were 4.79, 10.67 and 1.54 inches respectively.
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