Effect of timing of defoliation on wheat (Triticum aestivum) in central Queensland: 2. N uptake and relative N use efficiency |
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| Institution: | 1. Plant Science Group, Central Queensland University, Rockhampton, Qld 4702, Australia;2. Department of Natural Resources, Indooroopilly, Qld 4068, Australia;3. Department of Natural Resources and Mine, Locked Mail Bag, Biloela, Qld 4715, Australia;1. Computer Science and Electrical Engineering, University of Maryland, Baltimore County, United States;2. Computer Science and Computer Engineering, University of Arkansas, United States;3. Fayetteville, Biological and Agricultural Engineering, University of Arkansas Cooperative Extension Service, Little Rock, AR, United States;1. Institute of Economic and Social Sciences, University of Agriculture in Krakow, Poland;2. Institute of Plant Production, University of Agriculture in Krakow, Poland;3. Department of Agrotechnology and Agricultural Ecology, University of Agriculture in Krakow, Mickiewicza 21, 31-120 Krakow, Poland;1. CNRS – Université des Antilles et de la Guyane, UMR EcoFoG, Campus Agronomique, 97310 Kourou, Guyane Française, France;2. INRA, UR 272 Science du Sol Centre de Recherches d''Orléans, CS 40001, Ardon, 45075 Orléans Cedex 2, France;3. CETIOM, Établissement Public Local d''Enseignement et de Formation Professionnelle Agricole de la Guyane, Savane Matiti, BP 53, 97355 Macouria, Guyane Française, France;4. CETIOM, 1 avenue Lucien Brétignières, 78850 Thiverval-Grignon, France;5. Montpellier SupAgro, UMR SYSTEM (INRA, CIRAD, SupAgro), Bât. 27, 2 place Viala, 34060 Montpellier Cedex 2, France;6. IRD, UMR 210 Eco&Sols, Bât. 12, 2 place Viala, 34060 Montpellier Cedex 2, France;7. INRA, UMR EcoFoG, Campus agronomique, 97310 Kourou, Guyane Française, France;1. Instituto de Biología Subtropical, Universidad Nacional de Misiones – CONICET, Bertoni 85, 3370 Puerto Iguazú, Misiones, Argentina;2. Instituto de Investigaciones Marinas y Costeras-CONICET, Instituto de Geología de Costas y del Cuaternario-CIC, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Deán Funes 3350-CP 722, Buenos Aires, Argentina;3. Facultad de Ciencias Forestales, Universidad Nacional de Misiones, Bertoni 124, 3380 Eldorado, Misiones, Argentina |
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| Abstract: | Aspects of nitrogen uptake and use efficiencies were studied in trials quantifying the impact of artificial defoliation on wheat yield and protein content. Late defoliation (after ca. 50 days after sowing, especially in later sowings) led to an increase of hay production, a reduction of N as grain, and nearly always an increase in total N removal. The optimum range of N removal in hay by defoliation was 8–12 kg ha−1 leading to a maximum grain N of 75–79 kg ha−1 and a significantly greater total N recovery and use efficiency. This may be due to greater uptake per se, to reduced plant volatilization of N, or to a combination of the two. The ecological consequence of capturing more N in hay before it is possibly volatilized from plants later in the season is an added benefit to defoliation. |
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