Ron MM, T Loewy

Phyton-International Journal of Experimental Botany, Vol.86, pp. 68-73, 2017, DOI:10.32604/phyton.2017.86.068

Abstract In the southwest of Buenos Aires Province (Argentina) nitrogen (N) and phosphorus (P) deficiencies are important wheat yield limiting factors. The objective of this paper was to report on the comparative effectiveness of diammonium phosphate (DAP) and triple superphosphate (TSP) in the area covering a range of soils and years. Between 1983 and 1992, 13 experiments were carried out in farmer’s fields. Soils were classified as Ustolls and Udolls. The design of the experiments was of complete randomized split blocks. Horizontal treatments were P-sources (DAP and TSP) and rates (0 to 135 kg/ha). Vertical treatments were check and a single… More >

Mirleau-Thebaud V^1,2, J Dayde¹, JD Scheiner^1,3,4

Phyton-International Journal of Experimental Botany, Vol.86, pp. 53-67, 2017, DOI:10.32604/phyton.2017.86.053

Abstract Soil compaction represents an important issue in the actual context of agricultural system sustainability. Research on the various developments of root systems under tillage has been explored for many crops, whether for the biomass area or the underground, but very little concerns Sunflower (Helianthus annuus L.). The objectives of the study were to understand the impact of soil tillage and of the induced mechanically compacted soil on: i) sunflower’s root system architecture, ii) biomass area iii) production. Two complementary experiments were realized in the south of France (France’s main sunflower production area). In both experiments, increased resistance of the soil… More >

Aguirre-Hernández E¹, R San Miguel-Chávez², M Palma Tenango², ME González-Trujano³, E de la Rosa-Manzano⁴, G Sánchez-Ramos⁴, A Mora-Olivo⁴, A Martínez- Palacios⁵, JG Martinez-Ávalos⁴

Phyton-International Journal of Experimental Botany, Vol.86, pp. 46-52, 2017, DOI:10.32604/phyton.2017.86.046

Abstract HPLC analysis of capsaicin and dihydrocapsaicine concentrations obtained from fruits of Capsicum annuum var. glabrisculum, collected from four localities in the state of Tamaulipas, Mexico, was investigated. Selection of localities for this study was carried out considering that 65% of the people living in them gather wild chilli pepper for either autoconsumption or commercial purposes. An ANOVA analysis was carried out for determining capsaicinoids composition variation. Also, a multivariate analysis was carried out using Pearson correlation and principal components analysis to elucidate the influence that environmental factors might have on capsaicinoids concentration. Fruits from the locality El Gavilán had the… More >

González-Cervantes G¹, JA Chávez-Simental², IA Ortiz-Sánchez³, LM Valenzuela-Núñez⁴, MA Macías-Corral⁵, JG Arreola-Avila⁶

Phyton-International Journal of Experimental Botany, Vol.86, pp. 40-45, 2017, DOI:10.32604/phyton.2017.86.040

Abstract The introduction of ornamental crops to the Comarca Lagunera is a great market opportunity for producers of flowers, just as it is the case of Caladium bicolor which is exported to Europe, USA, Caribbean islands and Africa. The use of organic products derived from cattle manure for fertilization, improves physical soil conditions and provides significant amount of nutrients to plants and reduce production costs. Therefore, the objective of this study was to quantify the growth of tubercle and root of the ornamental plant Caladium bicolor by applying organic fertilizer (OF) extracted from cattle manure. The experimental design was completely randomized… More >

Aguilar-Benítez G^1*, CB Peña-Valdivia², R Castro-Rivera³, JP Lara-Ávila¹, E Cruz-Crespo⁴, AN Rojas-Velázquez¹

Phyton-International Journal of Experimental Botany, Vol.86, pp. 28-39, 2017, DOI:10.32604/phyton.2017.86.028

Abstract It is documented that vermicompost increases germination and productivity of crops, but little is known of its effect on plant physiological responses under soil water deficit. The aim of this study was to analyze the effect of vermicompost and irrigation interruption on stomatal conductance, gas exchange, and yield of common bean cultivars (drought tolerant -cv. 92 and drought susceptible-cv. 122). Plants were cultivated in unamended soil or soil amended with 1.5 and 3% of vermicompost, with irrigation during the whole cycle but irrigation interruption at the flowering stage. Changes in soil moisture, stomatal conductance (g_s), transpiration (E), CO₂ assimilation (A),… More >

González-Franco AC¹, L Robles-Hernández¹, JL Strap²

Phyton-International Journal of Experimental Botany, Vol.86, pp. 14-27, 2017, DOI:10.32604/phyton.2017.86.014

Abstract The Streptomyces genus comprises a large and diverse group of bacteria, many of which are commercially exploited for the production of antibiotics and lytic enzymes. The thermophilic species are less studied than the predominant mesophilic species. However, the first ones are a potential source of thermostable bioactive products and enzymes with novel properties. In this study, two selected thermophilic streptomycetes were identified and their chitinolytic activities were evaluated. The identification of these two isolates was performed by microscopic morphology, partial 16S rDNA sequences, and its phylogenetic analysis. To study the chitinolytic activities of these isolates, the effects of colloidal chitin… More >

Zúñiga-Mendoza E, LF Ceja-Torres

Phyton-International Journal of Experimental Botany, Vol.86, pp. 7-13, 2017, DOI:10.32604/phyton.2017.86.007

Abstract In vitro tests were carried out, to evaluate the antagonist capacity of a strain of Trichoderma isolated from soil in La Cienega de Chapala, Michoacán, Mexico against Sclerotium cepivorum and Sclerotium rolfsii, casual agents of onion rot, an important disease in Mexico and the rest of the world. Percentages of radial growth inhibition (PRGI) were calculated every 24 h, until a rate of antagonism was obtained according to the Bell’s scale, as well as the percentages of inhibition of the production of sclerotia and their parasitism. The PRGI was 17.4% against S. rolfsii and 22.2% against S. cepivorum after 48… More >

Zhiqiang Ma^1,2, Lingshuang Kong^1,2, Xianlong Jin^1,2,*

CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.1, pp. 51-67, 2018, DOI:10.31614/cmes.2018.01739

Abstract Many engineering applications need to analyse the system dynamics on the macro and micro level, which results in a larger computational effort. An explicit-implicit asynchronous step algorithm is introduced to solve the structural dynamics in multi-scale both the space domain and time domain. The discrete FEA model is partitioned into explicit and implicit parts using the nodal partition method. Multiple boundary node method is adopted to handle the interface coupled problem. In coupled region, the implicit Newmark coupled with an explicit predictor corrector Newmark whose predictive wave propagates into the implicit mesh. During the explicit subcycling process, the variables of… More >

Kyung Sung Kim¹, Moo-Hyun Kim^2,*, Hakun Jang³, Hee Chen Cho⁴

CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.1, pp. 11-29, 2018, DOI:10.31614/cmes.2018.00199

Abstract A new MPS (Moving Particle Semi-implicit) method is developed to simulate the behaviors and interactions of multiple fine solid particles as a continuum. As fluid particles are affected by viscosity, so solid particles are affected by friction. The solid particle dynamics for landslides, dumping, and gravity sorting etc. which can be difficult to simulate using conventional MPS methods, are modeled in this paper using the developed multi-solid-particle MPS method that benefits from drawing comparisons with the corresponding fluid particle behaviors. The present MPS results for dumping solid particles are verified against the corresponding DEM (Discrete Element Method) results. The shape… More >

Dylan Conway¹, Daniele Mortari²

CMES-Computer Modeling in Engineering & Sciences, Vol.111, No.2, pp. 147-169, 2016, DOI:10.3970/cmes.2016.111.147

Abstract This paper presents a new method to estimate position from line-ofsight measurements to known targets when attitude is known. The algorithm has two stages. The first produces a closed-form unbiased estimate for position that does not account for the measurement error covariance. The second stage is iterative and produces an estimate of position that explicitly accounts for the measurement error covariance and the coupling between measurement error and sensor-to-target distance. The algorithm gives an accurate estimate of both position and the corresponding position error covariance and has a low computational cost. The computational complexity is O(n) for n point-targets and… More >