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- Title
Magnitude of Nitrogen Fixation by Lentil at Different Rates of Phosphorous Using <sup>15</sup>N Technique.
- Authors
Badarneh, D. M. D.
- Abstract
Two lentil cultivars, UJ1 and ILL, have been introduced into the farming system of the Middle East. The mfluence of P on their potential to fix N2 under drought conditions is lacking. A factorial field experiment was carried out at Taibeh (500 mm yr-1) and Muru (300 mm yr-1), where three rates of P, two lentil cultivars and barley were included. Phosphorus was the main plot, while lentil and barley were grown randomly in the subplots. A typical experiment treated with unlabeled 100 kg N ha-1 with similar P rates was conducted at the Taibeh site. Both cultivars on each site did not differ significantly at different levels of P regarding the biological yield. At each P level, both cultivars derived similar nitrogen percentages from atmosphere (per cent Ndfa), except at Taibeh with the intermediate rate of P, where ILL derived (66.1%) compared to UJ1 (40.3%). At Taibeh, the average percentages of N in the grain and straw were 4.17% and 1.14%, respectively, and were significantly higher than at the Muru site (3.38%, 1.29%). The relatively drought-like conditions at Muru reduced percentage Ndfa to ≈ 28 but this was increased by P addition. Nitrogen addition reduced panitioningof N (N index) from ≈ 0.70% to ≈ 0.55% and decreased P percentage in the grain from ≈ 0.40% to ≈ 0.31% and in straw from 0.11% to 0.07% due to early maturation. In spite of the indigenous <em>Rhizohium</em> efficiency to fix N2, only 52.0% and 42.3% of the plant N was derived from the atmosphere at Taibeh and Muru, respectively, causing depletion of soil N reservoir.
- Subjects
MIDDLE East; LENTILS; CULTIVARS; AGRICULTURE
- Publication
Journal of Agronomy & Crop Science, 1995, Vol 175, Issue 1, p7
- ISSN
0931-2250
- Publication type
Article
- DOI
10.1111/j.1439-037X.1995.tb01124.x