Evaluation of Biological Nitrogen at Trifolium pratense, Trifolium repens and Lotus corniculatus, on Harvesting Cycles
Keywords:
biological N, harvest cycle, perennial legumes, Lotus corniculatus, Trifolium pratense, Trifolium repensAbstract
The amount of N species of perennial legumes fixed for each harvest and the total annual crop was assessed on a 2-year period, in a mixture with Festuca arundinaceea. There are using different nitrogenous fertilizer levels: N0; N50; N100; N150. The amount of biological N is positively correlated with the percentage of participation of legumes. During the growing, amount of N increases from cycle I (CI) towards cycle III (CIII), being registered for CI - 15 % N, CII - 32% N and CIII - N 53% of the total nitrogen fixed of species Trifolium repens. For Trifolium pratense and Lotus corniculatus species, the maximum amount of N fixed is achieved at CII, registering a distribution harvest cycles thus 28% N - CI, 40% N - CII and 32% N-CIII for Trifolium pratense , 25 % N - CI, 45 % N - CII and 30 % N - CIII for Lotus corniculatus. The annual amount of N fixed averaged 85 kg / ha in Trifolium repens, 210 kg / ha in Trifolium pratense and 68 kg / ha in Lotus corniculatus. The fertilization with nitrogen at level of 100 and 150 kg / ha negatively influenced symbiotic nitrogen fixation in Trifolium repens and Lotus corniculatus species.
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