Fertigated Sugarcane Yield and Carbon Isotope Discrimination (Delta C-13) Related to Nitrogen Nutrition

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Kolln, Oriel Tiago
Castro Gava, Glauber Jose de
Cantarella, Heitor
Junqueira Franco, Henrique Coutinho
Martinez Uribe, Raul Andres
Rocha Pannuti, Luiz Eduardo da [UNESP]
Ocheuze Trivelin, Paulo Cesar

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The aim of this study was to evaluate the response of sugarcane to nitrogen (N) application with drip irrigation and the relation with carbon isotope discrimination (Delta C-13), aboveground dry matter cane yield and the N balance in consecutive ratoon crops of sugarcane. An experiment was set up in Jau, SP, Brazil, in which the second and third ratoon crop cycles (2008/2009 and 2009/2010) were evaluated. The experiment included an unfertilized N control in both years (T1), and the following three nitrogen (N) fertilizer rates (in kg ha(-1)) applied in 2008 and 2009, respectively: 70 and 50 (T2), 140 and 100 (T3), and 210 and 150 (T4). Fertilization with N caused a marked gain in stalk yields by 98 Mg ha(-1) in 2 years. The N export with harvest was higher than N application in the control treatment T1 and at the lower rate (T2); this, in addition to the observed linear response to N, indicate the need to increase N fertilization in irrigated sugarcane. The values of Delta C-13 decreased with the increase of N supply showing a significant negative correlation (p < 0.05) with stalk as well as whole plant aboveground dry matter yields. The values of Delta C-13 in top leaves may be used as a tool to characterize the N status of sugarcane plants and its relation to aboveground dry matter and yield.



Drip-irrigation, C-4 plants, Water management, Sugar, N fertilization

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Sugar Tech. New Delhi: Springer India, v. 18, n. 4, p. 391-400, 2016.