nitrogen use efficiency and life cycle of root nodules in alfalfa after different mineral fertilization and soil cultivation practices were studied. field trial was conducted in the institute of forage crops, pleven, bulgaria on leached chernozem subsoil type and no irrigation. the next treatments were tested: i) for fertilization as follows: n0p0k0 (control); n60p100k80 (an accepted technology...

ABSTRACT The current recommendations for nitrogen (N) doses may not contemplate the complex dynamics of N in soil, what imply insufficiency to crop demand. This study aimed evaluate use two portable chlorophyll meters (Minolta SPAD 502 and ClorofiLOG model CFL 1030), after defining sufficiency index (NSI), estimate fertilization factor modern bean genotypes. A block design was used, with four r...

To evaluate plant and herbivore responses to nitrogen we conducted a fertilization study at a low and high pollution site in the mixed conifer forests surrounding Los Angeles, California. Contrary to expectations, discriminant function analysis of oak herbivore communities showed significant response to N fertilization when atmospheric deposition was high, but not when atmospheric deposition wa...

Long-term livestock over-grazing causes nitrogen outputs to exceed inputs in Inner Mongolia, suggesting that low levels of nitrogen fertilization could help restore grasslands degraded by overgrazing. However, the effectiveness of such an approach depends on the response of production and species composition to the interactive drivers of nitrogen and water availability. We conducted a five-year...

Marigold belongs to the oldest medicinal plants, which had been used in the ancient times. At present it supplies its material of a great significance for pharmaceutical and cosmetic industry. The study was conducted in the period 2007–2009 on loess soil with the granulometric composition of silt loam. The aim of the experiment was to determine the effect of different nitrogen doses (0, 40, 80,...