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In this paper are studied two soil profiles from the soil map in scale 1:25 000 of the fluvial plain region Carrizal-Chone, in Manabi province, Ecuador. One of profiles is a soil fluvic Feozem by tree vegetation and the other is a fluvic eutric Cambisol by long time cultivated condition. It is studied the changes of the physical soil properties by the anthropogenic conditions, with changes in the soil structure, volume density, and the increasing of the dispersion factor. In this paper is demonstrated the change from a Feozem soil to a Cambisol soil because the long time cultivated action [ABSTRACT FROM AUTHOR]

The use of biostimulants in plant production is an agricultural practice friendly to environment and one of the tools employed in the sustainable agriculture. The present paper was to determine the influence that the application of products based in oligosaccharines exerted on plant growth and development of garlic (Allium ampeloprasum L.) cv. 'Fredy'. The present work was performed, under field conditions, during the period October 2020 - February 2021 with the objective of determining the influence of the application of products based in oligosaccharines on the growth and development of elephant garlic plants (Allium ampeloprasum L.) cv. 'Fredy'. The effect of determined doses of QuitoMax® and PectiMorf® products, in different ways of application ("seed" imbibition, foliar spray at 80 DAP and the combination of both with the particularity was evaluated of also, combining the products) on the behavior of emergence percentage at 7 and 14 DAP. Besides, plant height (cm) and leaf number at 70, 90 and 110 DAP; as well as, the bulb characteristics and the survival percentage at harvest time was evaluated too. In addition, plant yield was estimated. Results shown that, in general, the application of QuitoMax® was more efficient than that of PectiMorf® in stimulating all the indicators evaluated, although the best results were obtained when both products were used in combination, that is, the "seed" imbibition with QuitoMax® and the foliar spray of the plants with PectiMorf® or viceversa. [ABSTRACT FROM AUTHOR]

The pumpkin (Cucurbita pepo L.), of American origin, represents one of the most used species today. Mexico is an important center of origin, domestication and diversification of the genus Cucurbita. Pumpkin production in Mexico places it in sixth place. This crop has as main limitation for its production the incidence of different harmful organisms, where foliar diseases of fungal origin are the most important, where powdery mildew stands out with economic losses of 50 to 100 %. For proper management, an important element is the correct identification of the causal agent, since two different genera and species are associated with the disease. Worldwide, the identified species that infect the Cucurbitaceae family are Podosphaera fusca (Fr.) Braun &. Shishkoff (syn.: Sphaerotheca fusca (Fr), Podosphaera xanthii (Castagne) U. Braun & Shishkoff) or Golovinomyces cichoracearum (DC.) V.P. Heluta. The control of the pathogen has been carried out mainly with the use of fungicides. However, its use causes negative effects on the biodiversity of agroecosystems, which can cause irreversible damage to the environment, increase production costs and enhance fungus resistance. Hence the importance of seeking new alternatives for its management, such as the use of oils, salts and biological control agents. This paper presents a review related to the updated identification of pumpkin powdery mildew, as well as trends in its management. [ABSTRACT FROM AUTHOR]

Dendrobiums are part of the most cultivated orchid genus in the world, thanks to their easy cultivation and the large number of hybrids obtained in different shapes, colors and sizes. This paper presents the main characteristics of a new Dendrobium cultivar, 'Maravillosa Habana', which is the result of pollination between Dendrobium 'Tropical classic' and Dendrobium 'Olawan Lakeland'. It is registered and published in the database of the Royal Horticultural Society of England, Orchids Review Supplement 2020. [ABSTRACT FROM AUTHOR]