Portal de Periódicos da CAPES

Biomass Distribution and Nitrogen-15 Partitioning in Citrus Trees on a Sandy Entisol

2003; Wiley; Volume: 67; Issue: 2 Linguagem: Inglês

10.2136/sssaj2003.0555

1435-0661

Dirceu Mattos, Donald A. Graetz, A. K. Alva,

Horticultural and Viticultural Research

Soil Science Society of America JournalVolume 67, Issue 2 p. 555-563 Division S-4—Soil Fertility & Plant Nutrition Biomass Distribution and Nitrogen-15 Partitioning in Citrus Trees on a Sandy Entisol Dirceu Mattos, Corresponding Author Dirceu Mattos ddm@centrodecitricultura.br Centro de Citricultura Sylvio Moreira- IAC, Via Anhanguera, km 158, 13490-970 Cordeirópolis, SP, BrazilCorresponding author (ddm@centrodecitricultura.br)Search for more papers by this authorDonald A. Graetz, Donald A. Graetz Univ. of Florida, Soil and Water Science Dep., 106 Newell Hall, P.O. Box 110510, Gainesville, FL, 32611-0510Search for more papers by this authorAshok K. Alva, Ashok K. Alva ARS-USDA, 24106 N Bunn Rd., Prosser, WA, 99350-0000Search for more papers by this author Dirceu Mattos, Corresponding Author Dirceu Mattos ddm@centrodecitricultura.br Centro de Citricultura Sylvio Moreira- IAC, Via Anhanguera, km 158, 13490-970 Cordeirópolis, SP, BrazilCorresponding author (ddm@centrodecitricultura.br)Search for more papers by this authorDonald A. Graetz, Donald A. Graetz Univ. of Florida, Soil and Water Science Dep., 106 Newell Hall, P.O. Box 110510, Gainesville, FL, 32611-0510Search for more papers by this authorAshok K. Alva, Ashok K. Alva ARS-USDA, 24106 N Bunn Rd., Prosser, WA, 99350-0000Search for more papers by this author First published: 01 March 2003 https://doi.org/10.2136/sssaj2003.5550Citations: 28 This research was supported by the Florida Agric. Exp. Stn., and approved for publication as Journal Series no. R-08457. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The area under citrus production in Florida is 332 000 ha, with a production of 10 to 12 million metric tonnes of fruit annually. Nutrient management recommendations are needed to increase N uptake efficiency and to minimize nitrate leaching below the root zone. The objectives of this study were (i) to evaluate biomass distribution of 6-yr-old ‘Hamlin’ orange trees [Citrus sinensis (L.) Osbeck] on ‘Swingle citrumelo’ [Poncirus trifoliata (L.) Raf. × C. × paradisi Macfad.] rootstock grown in a sandy soil under low volume irrigation, and (ii) to estimate partitioning of 15N fertilizer applied to the soil during early spring into different tree components. We evaluated biomass of tree components (leaves, twigs, trunk, taproot, roots, and fruit), and N recovery and distribution of 15NH415NO3 (AN) and 15N-urea (UR) (10 atom % 15N) applied to the soil surface. About 70% of dry matter biomass of trees was aboveground (AG). Length density of feeder roots was concentrated at a depth of 0 to 15 cm below the soil surface and varied from 1.87 to 0.88 cm cm−3 at 0.5- and 1.5-m distance from the trunk, respectively. Total recoveries of 15N by trees were 25.5% for UR and 39.5% for AN at fruit harvest, 280 d after fertilization. Mean accumulation of applied 15N in recent leaf flush was 4.2% and that of older leaves was 2.5%. Accumulation of 15N was low in woody tissue. Since fruit represented a large sink for N (10.2 and 18.4% recovery of 15N applied as UR and AN, respectively), we confirmed the importance of N fertilization before fruit development. Citing Literature Volume67, Issue2March 2003Pages 555-563 RelatedInformation