Ecofisiología Vegetal y Producción de Cultivos / Plant Ecophysiology and Crop ProductionIntegrated system for recommending fertilization rates in pineapple (Ananas comosus (L.) Merr.) crop Sistema integrado para recomendar dosis de fertilización en el cultivo de la piña (Ananas comosus (L.) Merr.) AbstractIn recent years much attention has focused on the impacts of agriculture on climate change, due to this stage specialists in plant nutrition and soil fertility have achieved the task of generating adequate fertilization doses for pineapple to reduce effects on environment. A methodology for Integrated System for Recommending Fertilizer Dose (ISRFD) was used. As a result, seven Thiessen polygons of the average annual rainfall, where rainfall ranged from 1640 to 2841 mm was correlated. Therefore, three major soil groups were defined and classified as subunit level. Likewise, eight doses of fertilizers were generated as follows: N, P 2 O 5 and K 2 O, with a fertilizer dose, a map is generated according to the cultivar: 230-138-300 for Creole pineapple in Acrisol Cutanic (Chromic, Ferric); 460-161-480 for Cayenne and MD2 in Acrisol Cutanic (Endoclayic, Ferric); 345-161-450 for Cayenne and MD2, for Creole in Acrisol Cutanic (Endoclayic, Hyperdystric, Ferric); 391-161-450 for Cayenne and MD2 in Acrisol Umbric Cutanic (Endoclayic, Hyperdystric) and Acrisol Umbric Cutanic (Endoclayic, Hyperdystric, Ferric); 207-138-300 for Creole in Acrisol Umbric Cutanic (Endoclayic, Hyperdystric); 253-138-300 for Creole in Acrisol Umbric Cutanic (Endoclayic,Hyperdystric, Ferric); 253-138-360 for Creole in Acrisol Umbric Gleyic (Hyperdystric, Ferric); and 391-161-360 in Cambisol Endogleyic (Clayic, Eutric). These fertilizer doses were supplemented with micronutrients to obtain the expected results.

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Objetivo: El presente trabajo se realizó con el objetivo de evaluar la capacidad infectiva de propágulos de hongos micorrizicos arbusculares (HMA) en el cultivo de caña de azúcar de la región de la Chontalpa, Tabasco. Diseño/metodología/aproximación: Se realizaron muestreos de rizosfera en los suelos Cambisol Fluvico, pertenecientes al poblado C-28 y Cambisol Endogleyico, pertenecientes al poblado C-20, a una profundidad de 0 a 30 cm para evaluar porcentaje de colonización en raíces, número de esporas en 100 g de suelo y para la clasificación taxonómica de HMA. Resultados: El estado micorrizico del suelo indica que el porcentaje de colonización en raíces fue de 100% en los dos tipos de suelos y 2833±2064 esporas en 100 g del suelo Cambisol Flúvico y 2966±873 esporas en el suelo Cambisol Endogléyico. Se identificaron cuatro especies de HMA Entrophosfora nevadensis, Sclerocystis sinuosa, Funneliformis geosporum y Claroideum glomus luteum. El suelo que presento mayor número de especies fue el Cambisol Endogléyico. En la capacidad infectiva de propágulos de ambos tipos de suelos, la dilución 4² presentó mayor colonización con un 100% de colonización de raíces y la menor colonización en la dilución 4⁶ con 93.0% de colonización. Limitaciones del estudio/implicaciones: Por el periodo o etapa evaluado no permitió la clasificación taxonómica, por lo que, el estudio debe hacerse más a detalle. Hallazgos/conclusiones: No se observaron esporas en esta etapa, por lo cual la clasificación taxonómica no pudo realizarse. Los HMA evaluados tienen un alto potencial para utilizarse en un programa de producción de biofertilizantes.

Objective: To optimize the composting process of sugarcane filter-pressed mud, straw, and ash as an alternative to reduce the environmental contamination of sugarcane cultivation in the Santa Rosalía sugar mill (Ingenio Santa Rosalía) of Chontalpa, Tabasco, Mexico.Design/Methodology/Approach: A completely randomized experimental design in a factorial arrangement was used, with compost mixtures and the aeration times as study factors. Ten treatments were generated with six repetitions each. The study variables were pH, organic matter (%), and nitrate (NO 3 - ) and ammonium (NH 4 + ) content.Results: The compost mixture factor had significant effects on compost quality parameters. Aeration times did not affect the quality of the different compost mixtures. Chemical characteristics of pH and organic matter did not present differences between the treatments. Study Limitations/Implications: The use of industrial sugarcane residues generates quality organic fertilizers through the composting process; therefore, it is necessary to test more residues, such as molasses and vinasses.Findings/Conclusions: The 100% sugarcane filter-pressed mud and the 100% sugarcane filter-pressed mud + 0.5% N treatments presented the highest amount of NO 3 - and NH 4 + and were therefore considered the best treatments. All treatments were classified as mature composts, rich in organic matter, with alkaline pH, and made ofsteady materials.

Objective. To prepare the fertility classification for the sugarcane-cultivated soils in the Pujiltic Sugarcane Mill (PSM) supply area in order to improve decision-making. Design / methodology / approach. The soils were classified according to their fertility (FCC), using a system based on the quantifiable parameters of the upper soil layer and some characteristics of the subsoil directly linked to the growth of sugarcane. Results. Six factors limited the agricultural potential of the PSM soils: alkalinity, water excess or deficit, clay content, erosion, nutritional deficiencies, and low CEC, which alone or in groups act in detriment of soil fertility. Limitations / implications. Solving these problems requires a comprehensive analysis that considers crop type, planting season, and technology availability. Findings / conclusions. The soil fertility classification system enabled the classification of 11 soil subunits of the PSM area.