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Victoria de Durango, Mexico

Urrieta-Velazquez J.A.,Programa de Edafologia | De Las Rodriguez-Mendoza M.N.,Programa de Edafologia | Ramirez-Vallejo P.,Programa de Genetica | Baca-Castillo G.A.,Programa de Edafologia | And 2 more authors.
Revista Chapingo, Serie Horticultura

Tomato quality depends on its use and it is related to flavor, color, smell and nutraceutic properties and management processes. Researchers have improved these characteristics using wild relatives and native varieties. The ribbed tomato is grown and marketed in some regions of Mexico. These native varieties are characterized by the undetermined growth of the plants and their ribbed and very red fruits. The aim of this study was to determine the fruit production and quality of tree selections of tomato (Starmex1, Starmex2 and Starmex3) grown under greenhouse conditions using two osmotic potentials (OP) of Steineŕs nutrient solution (-0.036 and -0.070 MPa), and using volcanic rocks (tezontle) as substrate. A total of six treatments and an experimental design of randomized complete block with ten replications were carried out. Yield increased with the Steiner Solution at OP of -0.072 MPa in the selection Starmex2. The equatorial diameter in Starmex2 and the number of sepals in Starmex3 increased with the most concentrated solution regarding the morphology of the fruit. The pH increased only when plants were irrigated with nutrient solution at OP of -0.072 MPa, in the case of fruit quality. Coordinación de Revistas Institucionales © 2012-2013. Source

Montemayor-Trejo J.A.,Technological Institute of Torreon | Lara-Mireles J.L.,Autonomous University of San Luis Potosi | Woo-Reza J.L.,Autonomous University of San Luis Potosi | Rivera-Gonzalez M.,CENID RASPA INIFAP | Trucios-Caciano R.,CENID RASPA INIFAP

In the Comarca Lagunera, México, water availability is the most important limiting factor for forage production. Its deficit for balance in recharging the aquifer is 450 million m3 (Mm3); therefore, it is necessary to evaluate irrigation methods which may increase water productivity. The objective of this research was to evaluate three irrigation systems: subsurface drip irrigation (SDI), center pivot (CP), and gravity (G) on forage maize (Zea mays L.). Variables obtained were consumption models of applied water, foliar area index (FAI), dry matter production (DM), and water productivity (WP). The study was carried out in the Comarca Lagunera, municipality of Torreon, Coahuila, México, in the spring-summer cycle of the years 2006 and 2007, at two locations: 1) in the small property Campo Sagrado, and 2) the Company VERMIORGANIC S.P.R. of R.L. At the two sites, dry sowing was carried out, using Aspros 900 hybrid plants at a density of 90 000 plants ha-1. The water applied was measured with a volumetric meter, and evaporation with a class A pan evaporation, and FAI with a LAI 2000 Plant Canopy Analyzer Equipment (LI-COR, Inc. Lincoln, Nebraska, USA). Linear regression method was used in order to obtain the models; and the slopes and mean values were compared with the Student's t test (p≤0.05). The production of DM and WP was higher (p≤0.05) with SDI than with C and G. Based on the models, an average consumption of 0.51, 0.56, and 0.73 cm d-1 was calculated for SDI, CP, and G (R2≥0.97). With a polynomial model for FAI daily increase of 0.25, 0.15, and 0.10 for SDI, CP, and G (R2≥0.96) was calculated. We conclude that the amount of applied water was lower in the subsurface drip irrigation system; in the three irrigation systems, water application did not surpass the evaporation of class A pan evaporation. The FAI was described by a second-degree polynomial model. Source

Zermeno-Gonzalez A.,Antonio Narro Agrarian Autonomous University | Flores-Guerrero J.A.,Antonio Narro Agrarian Autonomous University | Munguia-Lopez J.P.,Research Center en Quimica Aplicada | Gil-Marin J.A.,University of the East Venezuela | And 4 more authors.

The determination of daily evapotranspiration is important to properly program irrigation in the production of pecan trees [Carya illinoinensis (Wangehn.)]. In a pecan nut orchard located in the la Comarca Lagunera, State of Coahuila in northern México, measurements (eddy covariance method) of sensible and latent heat flux were carried out on the canopy of trees during May, June and July 2008. The net radiation and the soil surface heat flux were also measured. With this information the evapotranspired water depth (ETr) and the amount of the equilibrium evapotranspiration (ETequ) were determined daily (from 08:00 to 20:00 h) and for 30 min. It was noted that ETr and ETequ were similar between the days tested. This indicated a small effect of local advection in the evapotranspiration rate of the vegetated surface and that the equilibrium evapotranspiration could be used to determine the daily water consumption of trees in the orchard. Source

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