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- W1997024228 abstract "Abstract Although boron (B) deficiency in chestnuts (Castanea sativa Mill.) has been identified in Portugal and B fertilization was carried out in some orchards, the post-treatment evaluations have not been made to date. So the objective of this trial was to confirm the B deficiency and to quantify the effect of B applications to the soil on nut yield and quality. In October 2006, a fertilizer trial was established in a 15 year-old orchard in a very acid soil derived from siliceous schists. Soil liming and a basal fertilization were carried out in 16 trees and two levels of sodium tetraborate (Granubor, 14.6% B) were applied to eight trees: control (B0) and 100 g of Granubor per tree (B1). In the beginning of September chestnut leaves were collected from five trees and analyzed for macro- and micronutrients. Nut productivity was measured per tree and some nut quality parameters were evaluated, including the chemical composition of the kernel (soluble sugars, starch, total fiber, crude protein, and crude fat) in 2007, and dry matter, nut caliber, and fruit damage in 2007 and 2008. Boron fertilization of chestnuts significantly increased nut production: 75% in the first year (8 kg and 14 kg per tree, respectively, in the B0 and B1) and, in the second year, was over four times higher (4 kg and 17 kg per tree, respectively, in the B0 and B1). No significant differences were found in dry matter, nut caliber, nut damage and chemical composition of the kernel in the first year, but in the second year lower fruit damage by chestnut tortrix (P<0.0089) was observed. Foliar analyses exhibit relatively low B concentrations in the control trees (average value of 8 mg kg−1) in both years, while in the fertilized trees the foliar B concentration were in average 61 mg kg−1 in the first year, and 34 mg kg−1 in the second year. The large drop in the foliar B concentration in the second year suggests the need to monitoring the nutrient status of chestnut orchards or more frequent of B application than usual practice. Keywords: boronyieldnut quality ACKNOWLEDGMENTS Field assistance was provided by José Rego. Chemical analyses were carried out in the Laboratory of Applied Biology and Laboratory of Soils and Plants of the University of Trás-os-Montes and Alto Douro. This study was supported by grants from CITAB. We are indebted to the chestnut grower José Rodrigues who kindly provided us with the trial site for this work." @default.
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- W1997024228 date "2011-06-01" @default.
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- W1997024228 title "BORON APPLICATION ON A CHESTNUT ORCHARD: EFFECT ON YIELD AND QUALITY OF NUTS" @default.
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- W1997024228 doi "https://doi.org/10.1080/01904167.2011.580812" @default.
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