May 2019 WCN Digital Edition

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Figure 2. Illustration of amount of water applied orchards with a good 90 percent DU (left) vs poor 70 percent DU (right). In this illustration, the target amount of water applied is 1.0 inch. The difference in water applied across the orchard with 90 percent DU is 0.22 inches. The difference increases to 0.72 inches in the orchard with 70 percent DU, with the wettest trees receiving twice as much water as the driest trees. Continued from Page 10 Impact of Poor DU will be Reflected in Orchard Health and System Run Times Figure 2 shows a difference in applied water to an orchard where the DU is 90 percent versus a DU of 70 percent. In a scenario where the irrigator is targeting 1 inch of applied water in a block with a 90 percent DU, the applied water in the driest quarter of the orchard was 0.9 inches, while the wettest quarter of the orchard received 1.12 inches—a difference of 0.22 inches between the driest and wettest quarters of the orchard. However, an irrigator targeting 1 inch of applied water in a block with a 70 percent DU will see the driest quarter of his orchard receive 0.7 inches, whereas the wettest quarter of the block receives 1.42 inches of water. In this scenario, the wettest quarter of the block is receiving TWICE as much water as the driest. Management in a block where trees are receiving wildly different amounts of water becomes complicated because key events such as hull split and harvest can vary in duration and timing depending on tree water status. Equally, if not more important, fertigation of nutrients such as nitrogen will not be uniform and increase the risk of leaching in the wettest areas of the block. A low DU will also impact your bottom line because you will need to run your irrigation system longer to ensure that the driest quarter of your block receives the target application amount. Table 2 shows an example of the weekly evapotranspiration (ET) use of almonds, pistachio and walnuts Crop Almonds Pistachios Walnuts Continued on Page 14 Past Week Water Use 1.6 1.7 1.4 ["MANAGEMENT IN A BLOCK WHERE TREES ARE RECEIVING WILDLY DIFFERENT AMOUNTS OF WATER BECOMES COMPLICATED..." Adjusted for System Efficiency 70% Table 2. Sample from an ET irrigation report from August 2018. The columns under ‘Adjusted for System Efficiency’ show how much more water needs to be applied to ensure that the trees in the driest quarter of the block receive the amount of water shown under the ‘Past Week Water Use’ column. 2.3 2.4 1.9 80% 90% 2.0 2.1 1.7 1.8 1.8 1.5 [ 12 West Coast Nut May 2019
HEALTHY FROM NUT DEVELOPMENT TO HARVEST From nut development to harvest, Luna ® fungicide protects almonds throughout the growing season, improving plant health for beautiful crops and delivering abundant almond yields season after season. As a broad-spectrum systemic fungicide, Luna controls problematic summer diseases, including Alternaria and Rust, and suppresses Hull rot. Make Luna the cornerstone of your fungicide program to consistently produce a high-quality crop – and more of it. Find out what Luna can do for you at LunaSummerProtection.com. © 2019 Bayer Group. Always read and follow label instructions. Bayer, the Bayer Cross, and Luna are registered trademarks of the Bayer Group. Not all products are registered for use in all states. For additional product information, call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at www.CropScience.Bayer.us. Bayer CropScience LP, 800 North Lindbergh Boulevard, St. Louis, MO 63167. CR0319LUNNAAB047S00R0
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