The work was conducted at the experimental field of the Agronomic Faculty, University of Guilan, Rasht, Iran in 2008. The aim was to study the effect of compost on lettuce (Lactuca sativa cv. Great Lakes) growth, yield and yield components. No supplementary fertilization was applied until commercial harvest. Results revealed that compost used at 100 Mg. ha-1 did affect the yield of lettuce which was statistically different from other treatments with the lower compost. The significant differences were also found on plant weight and leaf numbers. In addition to head yield, it was shown that crop maturity was positively affected with compost application. However, Pearson correlation analysis showed that plant weight, leaf number and yield had significant correlation and in fact measure similar characteristics while other measured characteristics do not have significant correlation with other.
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