Yang G^1,2, Z Zhang¹, G Zhang³, H Zhang², X Han³, CA Busso⁴

Phyton-International Journal of Experimental Botany, Vol.85, pp. 100-107, 2016, DOI:10.32604/phyton.2016.85.100

Abstract Phosphorus is an essential macronutrient for all living plants and plant production. Simultaneously, atmospheric nitrogen deposition also affects plant productivity at a global scale. However, few studies have investigated how plants respond to P addition while simultaneously considering N deposition. We investigated plant biomass, nutrient status and stoichiometric ratios on Potentilla tanacetifolia in response to P fertilization under contrasting N addition rates in a typical meadow steppe in Inner Mongolia, China. Aboveground biomass of P. tanacetifolia increased under increasing levels of P fertilization under conditions of N addition. However, there was no significant change in biomass when only phosphorus was… More >

Hernández-Cruz AE¹, E Sánchez^2*, P Preciado-Rangel¹, M L García-Bañuelos², A Palomo-Gil¹, A Espinoza-Banda¹

Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 454-460, 2015, DOI:10.32604/phyton.2015.84.454

Abstract In the production of cotton (Gossypium hirsutum 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,… More >

Siliquini OA¹, GA Orioli², JC Lobartini²

Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 338-344, 2015, DOI:10.32604/phyton.2015.84.338

Abstract Onion (Allium cepa) is an important horticulture crop because of its value as a food with a long shelf life being a relatively non-perishable product. It is very helpful to understand the growth response of the seeded onion crop to conduct appropriate field practices in attaining the highest or optimum yields. A three year field experiment was conducted using a variety of onion Valcatorce INTA, in a randomized block design with five replicates. Treatments were two plant densities and three rates of N application. The bulb growth followed a classical sigmoid curve. During the rapid growing period, the crop had… More >

López-Elías JA, R González-Vega, E Márquez-Ríos, W Torres-Arreola

Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 331-337, 2015, DOI:10.32604/phyton.2015.84.331

Abstract Proteins are one of the major metabolites in biomass from microalgae that constitute the diet of marine organisms grown in aquaculture, and are essential for their growth. The quantity of this component is influenced by nutrients, temperature and light intensity, among others. We examined the growth, biomass production and protein of Chaetoceros muelleri with two sources of nitrogen (nitrate and urea) at three concentrations, using the medium f/2 (0.88 mol/L) (nitrates) as control. The treatments were the medium 2f (3.53 mol/L) and 4f (7.05 mol/L) with NO_3^-, and the medium f/2 (0.88 mol/L), 2f (3.53mol/L) and 4f (7.05 mol/L) with… More >

López-Calderón MJ¹, U Figueroa-Viramontes^2*, M Fortis-Hernández¹, G Núñez-Hernández², E Ochoa-Martínez², JI Sanchez-Duarte²

Phyton-International Journal of Experimental Botany, Vol.84, No.1, pp. 8-13, 2015, DOI:10.32604/phyton.2015.84.008

Abstract An experiment with increasing rates of fertilizer and manure in silage corn was established to evaluate the agronomic crop response and to estimate the manure nitrogen availability. The treatments were designed to deliver 0, 67, 100 and 133% of the crop nitrogen requirements (CNR), using ammonium sulphate and manure as N source. Dry matter (DM) yield was similar among treatments receiving N, but those values were greater than those found in the control. Nitrogen extraction at harvest was not statistically different in treatments with fertilizer or manure, but it was higher in these treatments than in the control without N… More >

Li^1,2 YY, X-T Lü¹, Z-W Wang¹, C Zhou^3,4, X-G Han¹

Phyton-International Journal of Experimental Botany, Vol.83, pp. 283-289, 2014, DOI:10.32604/phyton.2014.83.283

Abstract Relative growth rate (RGR) of plants is a key component of fitness. Theoretically, the RGR of plants would be closely related with biomass allocation. Our mechanistic understanding of the relationship between RGR and biomass allocation under global change scenarios is still limited. We examined the responses of RGR and biomass allocation of Leymus chinensis, a dominant grass in the temperate steppe of northern China, to a wide range of N addition. We found that N addition increased RGR of L. chinensis up to a threshold of 10 g N/m². While leaf and stem weight ratios were positively correlated with N… More >

Tizkar B¹, A Seidavi², M Sudagar³, JT Ponce-Palafox⁴

Phyton-International Journal of Experimental Botany, Vol.83, pp. 109-116, 2014, DOI:10.32604/phyton.2014.83.109

Abstract The aim of this study was to determine the effect of a granular or liquid fertilizer on the temporal variation of phytoplankton. Enrichment of the pond water with nitrogen and phosphorus resulted in an increased gross photosynthesis and biomass of the dominant algal species. Nutrient concentrations and dilution rates can determine the temporal variation in phytoplankton abundance and primary production. The variation may be largely maintained by nutrient regeneration or turnover from different forms. More >

Piña-González JL¹, EJ Morales-Rosales², A Domíngez-López², JF Ramírez-Dávila², G Estrada-Campuzano², O Franco-Mora²

Phyton-International Journal of Experimental Botany, Vol.83, pp. 101-108, 2014, DOI:10.32604/phyton.2014.83.101

Abstract The aim of this study was to assess the land equivalent ratio, biomass, grain yield and ethereal extract of Helianthus annuus in monoculture and associated with Pisum sativum in function of stabilized urea (0, 40, 80 kg N/ha) in El Cerrillo, México. It was also estimated pod yield obtained by P. sativum as a pure stand and associated with H. annuus. The six treatments (in each experiment) were evaluated in a 2 × 3 factorial experiment in a randomized complete block design with four replications. When F values were significant, the honestly significant difference test at the 5% level of… More >

Copperi MZ¹, ME M,olesi², MA Cantamutto², MM Ron²

Phyton-International Journal of Experimental Botany, Vol.82, pp. 99-106, 2013, DOI:10.32604/phyton.2013.82.099

Abstract Corn has not only a high growth potential and a great capacity of biological response to suitable crop management but also may contribute to a better match of crops with environmental offer in Argentina. Nitrogen (N) fertilization must make provision for eventual N losses, and fertilization strategies must be designed so as to minimize their global incidence. The different quick-release N sources show similar efficiencies when they are incorporated, but in surface applications, sources that contain little or no amidic N have a better performance than urea (U). The objective of this paper was to make an evaluation of corn… More >

López-Elías JA¹, D Fimbres-Olivarría³, LA Medina-Juárez¹, A Miranda-Baeza², LR Martínez-Córdova¹, DMA Molina-Quijada³

Phyton-International Journal of Experimental Botany, Vol.82, pp. 23-30, 2013, DOI:10.32604/phyton.2013.82.023

Abstract Microalgae have a high content of antioxidant compounds (carotenoids, phycobilins and fatty acids) used in biotechnology industry. Under stress conditions Dunaliella cells produce more carotenoids. Because of this, we evaluated growth, biomass and carotenoid production under control (indoor) and outdoor conditions using mass cultures of Dunaliella tertiolecta Butcher, under nitrogenlimited media. Control medium was f/2 (nitrates: 18.75 g/L), and limited media were f/4 (nitrates: 37.5 g/L), f/6 (nitrates: 25 g/L) and f/8 (nitrates: 18.75 g/L). The highest cell concentrations were found in cultures using medium f/2 maintained indoor (1.28 x 10⁶ cells/mL) and outdoor (0.76 x 10⁶ cell/mL). Dry biomass… More >