@Article{phyton.2015.84.454,
AUTHOR = {Hernández-Cruz AE, E Sánchez, P Preciado-Rangel, M L García-Bañuelos, A Palomo-Gil, A Espinoza-Banda},
TITLE = {Nitrate reductase activity, biomass, yield, and quality in cotton in response to nitrogen fertilization},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {84},
YEAR = {2015},
NUMBER = {2},
PAGES = {454--460},
URL = {http://www.techscience.com/phyton/v84n2/37179},
ISSN = {1851-5657},
ABSTRACT = {In the production of cotton (<i>Gossypium hirsutum</i> L.), nitrogen fertilization is one of the most costly crop practices, but important to reach high yields. However, high nitrogen (N) content in plants does not always translate into a high fibre production. One way of assessing the efficiency of the N fertilizer is through the enzymatic activity of the nitrate reductase (NR). This is a key enzyme in N assimilation, whose activity is regulated by a number of endogenous and exogenous factors that determine yield. The aim of this study was to assess the effect of N fertilization on yield, fibre quality, biomass, and NR enzymatic activity in vivo in the cotton variety Fiber Max 989. The evaluated application rates were 0, 50, 100, and 150 kg/ha of N, using urea as a source (46% N) in a randomizedblock design with three replicates. At harvest, the maximum yield of seed cotton and the greatest accumulation of total foliar biomass through time was reached after applying 150 kg N/ha. The different N-application rates did not affect the components of cotton-fibre quality. The activity of endogenous NR was greater on plants where 150 kg N/ha were applied. The highest cotton yield and N contents were obtained on these plants. Therefore, the NR activity <i>in vivo</i> could be used as a bioindicator of the N nutritional level in cotton.},
DOI = {10.32604/phyton.2015.84.454}
}