By Marian Stevens and Brent McGhie, Master Gardeners, 11-1-13
Although splitting is not known to result from any single factor, moderate cultural practices that avoid extremes in wet-dry soil moisture cycles and in nutrient levels should help to minimize the trouble. To avoid these fluctuations, trees should be irrigated regularly, especially during hot, windy weather. When hot and/or windy weather is anticipated, irrigate before this weather occurs. Continue to irrigate lightly for a few days, and then resume a normal irrigation schedule. For fertilization, instead of applying a single large application of quick-release fertilizer, smaller monthly applications through the Spring (February through May) may keep nutrient levels constant. Timed-release fertilizers are a convenient way of supplying nutrients at an even rate, but they are more expensive.
Although split oranges are edible, they are usually too green to be usable. Damaged fruit should be removed and discarded, since they may harbor fungi, bacteria, insects and other unwanted pests
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