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Tillage and subsequent bare soil have been linked to erosion, nutrient leaching, reduced biological diversity, loss of organic matter, and release of CO 2 into the atmosphere (Brady and Weil, 2004). The usefulness of an organic no-till system for transplanted vegetables was explored over two growing seasons. In 2007-2008, in a randomized complete block design, treatments of tilled and no-till (T and NT, respectively) were seeded to a dense grain and legume winter cover crop. Tilled plots were mown and disk-ploughed two times; NT plots retained a mow-killed mulch on the soil surface. There were less weeds in NT plots. A corollary experiment was conducted in 2007-2008 to help determine the best cover crops for a no-till system. There was no difference in the amount of biomass produced by the different cover crops, although anthesis for 'Juan' triticale (Triticum X Secale) was 12 days later than for 'Montezuma' red oats (Avena sativa). In 2008-2009, a completely randomized experimental design was used to test the effect of tillage on bell pepper yield, weed suppression, plant height, and total soil carbon. The treatments were tilled and no-till (T and NT, respectively). A winter cover crop was seeded. Tilled plots were mown, hand-forked and roto-tilled; NT plots retained a killed mulch on the soil surface. Although T plots yielded more bell peppers, NT plots had more weed suppression. There was no difference between the treatments in the change of total soil carbon over the 1 year period, although both treatments experienced overall gains. The present study will add to the growing body of research on the possibility of organic no-till vegetable farming for small-to mid-sized growers located on the central coast of California.

No-till Vegetable Production at the Cal Poly Organic Farm