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Fluid Journal : Fluid Journal 2005-2007
18 Fluid Journal EARLY SPRING 2007 during the busy season. Applying the recommended B rate also is critical in obtaining optimum crop yields. The window of opportunity for applying foliar B to boost yield is fairly wide and can be effective from the pre-bloom V6 stage through R2 reproductive stage. The best time of day for foliar application is early in the morning while dew is present. Leaf moisture aids the passage of nutrients into the inner leaf tissue. Recent studies have shown that the various types of water-soluble B sources on the market are equally effective in supplying B through the foliage as shown by plant analysis. The least-cost material is usually the best choice. Efficacy of some pesticides may be affected by increased pH of the pesticide tank mixes. While there is no evidence that pest control is negatively affected by adding B to the tank mix and spraying immediately, some applicators are concerned that adding B increases solution pH to the point that some chemicals start to break down and lose efficacy. Pesticides. Under high pH conditions, some pesticides may Figure 1. B-deficient soybean pods, Slaton, U. of Arkansas, 2003. start to break down over time. But the process is usually so slow that most of these pesticides will remain highly effective in the tank for hours or even days. There is no strong evidence that pest control has been adversely affected where chemicals are mixed and sprayed immediately. Most tank mixes are sprayed quite rapidly. Aerial applications take a few minutes and ground applications typically spray 300 gallons in less than two hours. Absorption. Once the application is made most of the material is absorbed into the plant within a few
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