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Mycorrhiza and phosphate interactions as affecting plant development, N2-fixation, N-transfer and N-uptake from soil in legume-grass mixtures by using a 15N dilution technique
| Content Provider | Semantic Scholar |
|---|---|
| Author | Barea, José Miguel El-Atrach, F. Azcón, Rosario |
| Copyright Year | 1989 |
| Abstract | Abstract The legume Medicago sativa (alfalfa)(+Rhizobium meliloti) and Lolium perenne (ryegrass) were grown, in a greenhouse, either alone or together in a soil and supplied with increasing amounts of soluble phosphate (P) with or without a vesicular-arbuscular inoculum (VAM). A small amount of 15N-labelled ammonium sulphate was added to each pot to distinguish the sources of N in the plants. The more mycotrophic legume enhance VAM formation by the grass in the mixture at all rates of P additions. Regardless of the cropping system and the P concentration in soil VAM improved, in most cases, dry matter production and the competitive ability of the legume. In spite of that competition from ryegrass reduced alfalfa development with increasing P concentration in the soil. In general VAM increased nodulation and the concentrations of N and P in alfalfa. The 15N enrichment of plant shoots indicated that VAM improved N2-fixation in alfalfa at all rates of P. In mixed cropping, alfalfa derived almost all its N from fixation, but the total amount fixed was decreased by competition from ryegrass in the same pot. The apparent soil N pool size (A-value) for the grass growing alone was significantly higher in mycorrhizal pots and VAM actually increased the total amount of N that the grass derived from soil, supporting a role of VAM in N-uptake. In mixed cropping the various interactions acting on N nutrition of the grass probably mask observations of the actual mechanisms involved, but there was clear isotopic evidence of N-transfer from the legume to the grass in non-mycorrhizal, P-supplemented plants. Apparently VAM enhanced N-transfer in one out of four cases. |
| Starting Page | 581 |
| Ending Page | 589 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/0038-0717(89)90133-8 |
| Alternate Webpage(s) | http://www.bashanfoundation.org/inmemoriam/Barea-J/bareantransfer.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/0038-0717%2889%2990133-8 |
| Volume Number | 21 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
