caa a22 4500 463209354 CHVBK 20180405153135.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10705-007-9102-x doi (NATIONALLICENCE)springer-10.1007/s10705-007-9102-x Aboveground nitrogen in relation to estimated total plant uptake in maize and bean [Elektronische Daten] [Francisco Salmerón-Miranda, Birgitta Båth, Henrik Eckersten, Johannes Forkman, Maria Wivstad] The main objective of this field study was to estimate the total plant uptake of soil mineral N in maize (Zea mays L.) and common bean (Phaseolus vulgaris L.) grown in crop rotations under different N content in Nicaragua. Secondary objectives were to estimate the fraction of the measured soil mineral N content taken up in this way, and to determine how the measured N in plant aboveground parts was related to the total mineral N uptake. A large variation in N content was obtained by using data from fertilisation experiments. Plant total N uptake was estimated as the residual N in a mass balance calculation of soil mineral N. Mineral N content in the top 0-0.3m soil layer in the field cultivations and in tubes isolated from root uptake, and N content in aboveground plant parts were measured every 30days. Estimated plant total uptake of soil mineral N varied considerably (2.5-14gNm−230day−1) over periods and N treatments. The range of variation was similar for maize and bean. The fraction of the soil mineral N that was taken up by the plant daily varied more in maize (about 0.03-0.12day−1) than in bean (about 0.05-0.08day−1). Our results suggest that monthly changes in N in aboveground plant parts were linearly related to plant total N uptake during the same period. Aboveground plant N constituted between about 55% and 80% of total uptake of soil mineral N in maize depending on period within season, whereas for bean it was more constant and smaller (about 40%). Springer Science+Business Media B.V., 2007 Soil mineral N nationallicence N uptake efficiency nationallicence Crop rotation nationallicence Tropics nationallicence Volcanic soil nationallicence cuptake : Daily fraction of soil mineral N taken up by plant nationallicence NAboveGr : N content of aboveground plant parts nationallicence NAboveGrFix : N in aboveground plant parts originating from N2 fixation nationallicence NAboveGrNoFix : N in aboveground plant parts originating from NSoilMin nationallicence NLeaching : Nitrate leaching during 30-day period nationallicence NMineralisation : Net N mineralisation in 0-0.3m soil layer during 30-day period nationallicence NSoilMin : Soil mineral N in 0-0.3m soil layer nationallicence NTotUptake : Total plant uptake of soil mineral N during 30-day period nationallicence ΔNXXXX : Change in NXXXX during 30-day period (XXXX is AboveGr etc.) nationallicence Salmerón-Miranda Francisco Department of Crop Production, Universidad Nacional Agraria, km 12 ½ carretera Norte, Box 453, Managua, Nicaragua aut Båth Birgitta Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut Eckersten Henrik Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut Forkman Johannes Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut Wivstad Maria Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut Nutrient Cycling in Agroecosystems Springer Netherlands 79/2(2007-10-01), 125-139 1385-1314 79:2<125 2007 79 10705 https://doi.org/10.1007/s10705-007-9102-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-007-9102-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Salmerón-Miranda Francisco Department of Crop Production, Universidad Nacional Agraria, km 12 ½ carretera Norte, Box 453, Managua, Nicaragua aut NATIONALLICENCE 700 1- Båth Birgitta Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut NATIONALLICENCE 700 1- Eckersten Henrik Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut NATIONALLICENCE 700 1- Forkman Johannes Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut NATIONALLICENCE 700 1- Wivstad Maria Department of Crop Production Ecology, Swedish University of Agricultural Science, Box 7043, 750 07, Uppsala, Sweden aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Springer Netherlands 79/2(2007-10-01), 125-139 1385-1314 79:2<125 2007 79 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer