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- W2140504503 abstract "In this research we have shown that most but not all of the currently used zinc fertilizer materials and application methods are effective for fertilization of avocado trees located on a calcareous soil. One of the simplest and most effective methods is the banding of zinc sulfate (7 Ibs per tree) in the sprinkler-wetted soil zone under the tree canopy. Zinc sulfate may also be applied on a quarterly basis through the irrigation water, which has the advantage of being less labor intensive than distributing zinc sulfate fertilizer by hand under individual trees. In comparison to zinc sulfate, zinc chelates applied quarterly through the irrigation line involved much lower quantities of zinc (6 grams of Zn/tree vs. 1,200 g for zinc sulfate), but in our experiment did not significantly increase the foliar zinc concentrations. Other treatments investigated foliar fertilization using zinc metalosate, zinc sulfate, and zinc oxide. On a per unit zinc basis, zinc metalosate was the most effective foliar fertilizer, but less expensive zinc sulfate also gave a good response. The third fertilizer material, zinc oxide (Zintrac-8) was shown to precipitate on the leaf surfaces and most of it could be removed by an acid wash of the foliage. In addition to uptake by the foliage, a potential problem with any of the foliar applied materials is their restricted translocation in the tree after application to the outer canopy. Relatively very small quantities were shown to be taken up by the outer canopy, which would be diluted to trivial levels if translocated to the inner canopy, fruit, and roots, all of which also require zinc. Given the present uncertainty on foliar materials, soil or irrigation-water applications of zinc sulfate represent the most reliable methods for zinc fertilization of avocado. Zinc (Zn) deficiencies are common in many subtropical areas where avocados are grown, and are suspected to be an important limiting factor in fruit production and tree health (13, 4). Deficiencies of Zn are typically associated with calcareous soils in which availability of the metal is limited by its extremely low solubility at alkaline soil pH. Under these circumstances, applications of inorganic fertilizers such as Zn sulfate result in temporarily increased availability until the metal precipitates out of solution as the poorly" @default.
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- W2140504503 date "1993-01-01" @default.
- W2140504503 modified "2023-09-27" @default.
- W2140504503 title "Zinc Nutrition of Avocado" @default.
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