caa a22 4500 477112358 CHVBK 20180405111612.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02185573 doi (NATIONALLICENCE)springer-10.1007/BF02185573 Rainfed vetch-barley mixed cropping in the Syrian semi-arid conditions [Elektronische Daten] I. Nitrogen nutrition using15N isotopic dilution [F. Kurdali, N. Sharabi, A. Arslan] A field experiment on vetch and barley grown in monoculture and in mixed culture was conducted under rain-fed conditions throughout two growing seasons. Plants were either subjected to three sequential harvests, or were harvested only once, at physiological maturity. Our results showed the advantage of a mixed cropping system of vetch and barley over sole cropping under rainfed conditions in terms of dry matter production, total nitrogen content, and land use efficiency expressed as land equivalent ratio (LER). This advantage was more pronounced in the plants harvested once at the end of the season than those subjected to the three successive harvests. Based on this result, a single seasonal rather than several harvests would be recommended under similar rainfed conditions. Nitrogen fixation in vetch measured by the15N-isotope dilution method, varied with the number of harvests and with cropping system. The percentage of N derived from the atmosphere (%Ndfa) of vetch in mixed culture was in most cases higher than in monoculture. The poor competitiveness of vetch for soil N uptake was responsible for the higher soil N uptake by barley and therefore, a higher %Ndfa in vetch. Positive and high final nitrogen balance was observed in the mixture. We excluded, under the current experimental conditions, the possibility of N-transfer from vetch to barley. Kluwer Academic Publishers, 1996 barley nationallicence legume nationallicence mixed crop nationallicence monocrop nationallicence N2 fixation nationallicence 15N nationallicence vetch nationallicence Vp : mono culture stand of vetch nationallicence Bp : mono culture stand of barley nationallicence VBm : mixed stand of vetch and barley nationallicence Vm : vetch in the mixed stand nationallicence Bm : barley in the mixed stand nationallicence H1, H2 and H3 : first, second, and third harvest, respectively nationallicence H0 : plants harvested once at physiological maturity nationallicence S1 and S2 : first and second season nationallicence Nr : residual nitrogen nationallicence Nt : total N in the above ground materials nationallicence Kurdali F. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut Sharabi N. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut Arslan A. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl 183/1(1996-06-01), 137-148 0032-079X 183:1<137 1996 183 11104 https://doi.org/10.1007/BF02185573 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02185573 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kurdali F. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut NATIONALLICENCE 700 1- Sharabi N. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut NATIONALLICENCE 700 1- Arslan A. Department of Radiation Agriculture, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria aut NATIONALLICENCE 773 0- Plant and Soil Springer Netherlands; gopher://gopher.wkap.nl/ 183/1(1996-06-01), 137-148 0032-079X 183:1<137 1996 183 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer