Elabbadi, K. and Ismaili, M. and Materon, L.A. (1996) Competition between Medicago truncatula and wheat for 15N labeled soil nitrogen and influence of phosphorus. Soil Biology and Biochemistry, 28 (1). pp. 83-88.

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To determine competition for nitrogen uptake, a greenhouse experiment was conducted using annual Medicago truncatula cf. Jemalong (medic) and Triticum turgidum spp. durum cv. Karim (wheat) grown alone or in mixture, over five successive crop cycles. Pots were supplied with P equivalent to 0, 50, 100 and 150 kg P2O5 ha-1 at the beginning of each crop cycle. The soil was labeled by growing wheat plants on soil fertilized with N enriched with 10.43 atom 15N excess and by incorporating the labeled wheat as organic matter (2.08 atom 15N excess) back into the soil. This method allowed estimation of N2 fixed by medic and N transfer to wheat. Compared to the sole medic crop, dry herbage yield and total N of medic grown in mixture, were reduced. Medic plants alone (unmixed) assimilated 80 more soil N that wheat alone at the higher rate of P. When in mixture, wheat plants took up more soil N than medic plants. The percentage N derived from synbiosis (Ndfa), by the sole medic, averaged 60. In mixture, Ndfa of the medic was 80. The total N difference method gave higher values for Ndfa (6-22) than the isotope dilution technique, depending on the P rate. This was because P rates affected the N absorption of medic and wheat differently. Dry herbage yield and total N of medic and wheat grown alone and in mixture were improved by P supply. Competition between medic and wheat was affected by P fertilization, favoring wheat which became more competitive for uptake of soil N at the higher P rates. When no P was added to the soil, mixed medic took up 60 of the soil N absorbed by sole medic; at the higher P rate, this was reduced to 34. Transfer of N fixed by medic to wheat was detected only after the second crop cycle. Copyright © 1996 Elsevier Science Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: competition; medic; nitrogen; phosphorus; resource competition; wheat, Medicago truncatula; Triticum turgidum durum; Triticum turgidum
Subjects: Agricultural and Biological Sciences
Divisions: SCIENTIFIC PRODUCTION > Agricultural and Biological Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:44
URI: http://eprints.umi.ac.ma/id/eprint/1479

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