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The objective of this experiment was to evaluate the yield, nutrimental and in vitro ruminal fermentation profiles of maralfalfa grass (Cenchrus purpureus Schumach.) Morrone, at four harvest frequencies.
"The encapsulation of copper nanoparticles (Cu NPs) in chitosan hydrogels could improve the yield and quality of fruit of horticultural crops due to the physicochemical properties of the NPs. The objective of this research was to evaluate different concentrations of Cu NPs in Chitosan-polyvinyl alcohol (Cs-PVA) hydrogels and their effects on the growth, productivity and fruit quality in tomato. The treatments were applied to the substrate as follows: 0.02, 0.2, 2 and 10 mg of Cu NPs in Cs-PVA hydrogel, Cs-PVA hydrogel alone and a control. The Cu NPs had significant effects on growth, productivity and fruit quality. They increased the numbers of leaves and clusters, fresh biomass of roots, and dry biomass of stem-leaves and roots of the plants. They also increased the soluble solid content, titratable acidity, lycopene content and total antioxidant capacity in the fruits. The concentration with the best effect on the growth and yield of tomato plants was 10 mg Cu NPs, which increased the stem diameter, dry biomass of stem-leaves (13%) and roots (30%) and the yield (17%), whereas the concentration of 0.02 mg Cu NPs increased the lycopene content (37%) and the total antioxidant capacity of the fruit (10%). The Cu NPs in Cs-PVA hydrogels helped to increase the yield and nutraceutical properties of the tomato fruits."
ADELAIDO RAFAEL ROJAS GARCIA SERGIO IBAN MENDOZA PEDROZA PERPETUO ALVAREZ VAZQUEZ MARIA DE LOS ANGELES MALDONADO PERALTA FERNANDO GONZALEZ CERON ARTURO PRO MARTINEZ SANTIAGO JOAQUIN CANCINO MILTON JAVIER LUNA GUERRERO (2019)
Objective: The objective of this research was to obtain the optimum cutting moment of the red clover by varying the
cutting frequency in the spring season. Design/methodology/approach: The treatments were cuts at different ages (eight weeks) in the spring season. The variables studied were: forage accumulation, botanical and morphological composition, foliar area per stem and photosynthesis. The statistical analysis of the data obtained was performed with the GLM procedure of the SAS statistical package. The results obtained in yield of dry matter showed an increase as the age of regrowth advanced, in week 8, 5013 kg MS ha¿1 total were obtained, resulting in the maximum value registered.
ADELAIDO RAFAEL ROJAS GARCIA MARIA DE LOS ANGELES MALDONADO PERALTA PAULINO SANCHEZ SANTILLAN SERGIO IBAN MENDOZA PEDROZA PERPETUO ALVAREZ VAZQUEZ JERONIMO HERRERA PEREZ ALFONSO HERNANDEZ GARAY (2018)
Ruminant production in the tropics is based primarily on native and introduced grass (Poaceae) grazing. The effect of the regrowth age and cutting intensity of Brachiaria hybrid cv Cobra grass was evaluated, and the nutritional value when varying the frequency and intensity of 10 and 15 cm of cutting in the dry season. The study period was from January 19 to March 30, 2017. The variables were dry matter yield, morphological composition, raw protein (RP), neutral detergent fiber (NDF), and acid detergent fiber (ADF). The highest yield was obtained after 56 days in the intensity of 15 cm with 2550 kg MS ha¿1; however, the highest volume of leaves was reached at 35 days with 1200 kg MS ha¿1. The maximum content of Cobra grass RP was in the frequency at seven days with 19.3% in the leaf
component, decreasing as the evaluation time went by. The NDF and ADF content increased with the age of the regrowth.
Genome-Wide Association Study Marker-Trait Association Synthetic Wheat Introgression Lines CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA GENOMES GENETIC MARKERS NITROGEN SINGLE NUCLEOTIDE POLYMORPHISM WHEAT YIELDS INTROGRESSION
Conservation agriculture (CA) systems represent a set of three soil management principles: minimarbance, permanent soil cover and crop rotations ‐ whereas the CA‐based systems in this study add the bed and furrow tillage techniques as integral elements of CA. Studies on the effects of long‐term CA‐based systems on soil health and crop productivity are rare globally, particularly in Ethiopia. This study aimed at investigating the long‐term (2005–2013) influence of CA‐based systems on soil health and crop productivity in northern Ethiopia. The treatments we used include two types of CA‐based systems (permanent raised bed PRB and contour furrowing CF) and conventional tillage (CT) arranged in a randomized complete block design. Soil samples were collected at 0–10 cm soil depth to assess soil health. Piecewise structural equation modeling (PSEM) was used to analyze linkages between management practices, soil health and crop productivity. Arbuscular mycorrhizal fungi spore abundance and root colonization was higher in PRB followed by CF compared to CT (p < 0.05). Significantly different soil N of 1.4 and 0.9 g kg−1 and available P of 6.7 and 4.1 ppm were recorded for PRB and CT, respectively. Higher straw and grain yield of 12 and 4.3, 10 and 3.5, 8 and 2.8 t ha−1 were recorded for PRB, CF and CT, respectively. Outputs of the PSEM highlighted two pathways in which CA‐based systems contributed to improved productivity: (a) via higher density of bacteria and improved hydraulic conductivity, and (b) via higher density of fungi and increase soil organic carbon content in the topsoil. The study concludes that CA‐based systems have the potential to improve crop productivity through improved soil health.