Download or read book Sampling Guide for Nutrient Assessment of Irrigated Vineyards in the Inland Pacific Northwest written by Joan R. Davenport and published by . This book was released on 2011 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Conclusion: When leaf nutrient levels are outside the critical range (Table 2), it often means that an adjustment to your fertilizer management program is needed. In general, a low concentration of a nutrient means that you should increase your fertilizer additions of this nutrient, and a high concentration means that you should reduce them. However, make certain you use a tissue test in conjunction with the physical appearance of your vines. If the vines are very stunted and tissue nutrient levels are high, it could be due to insufficient water at a critical growth period. If the vines are overly vigorous and the tissue levels are low, it likely means that an excess of one nutrient (usually N) has spurred growth and the concentrations of other nutrients may be "diluted" across the entire canopy. Regardless, when adjusting your fertilizer management plans, only make small changes over time. With perennial fruit crops, over-adjustment can lead to negative long-term consequences (e.g., excessive canopy growth with excessive N) which may take years to correct."