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Sidedress applications of ammonium nitrate increased the incidence and severity of bacterial soft rot (caused by Pseudomonas marginalis) in a susceptible broccoli cultivar, Premium Crop, but had no effect on a resistant one, Shogun. Plots received N in amounts ranging from 19 to 152 kg/ha and were sprinkler-irrigated two to five times a day during head maturation to create conditions conducive to the disease. The length of time necessary for heads to reach harvest maturity decreased with increased N (.)
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C. H. Canaday (1992) studied this question.
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