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Objective: To evaluate the response of sowing densities on agronomic parameters in the native mejen corn. Design/Methodology/Approach: A randomized complete block design with four repetitions was used for the treatments: T1 (0.25 m between plants and two seeds per hole (80,000 plants ha-1)), T2 (0.50 m between plants and three seeds per hole (60,000 plants ha-1)), T3 (0.75 m between plants and four seeds per hole (53,333 plants ha-1)), and T4 (1 m between plants and five seeds per hole (50,000 plants ha-1)). The following variables were determined: plant height without male flower (PHWMF, cm), ear size (ES, cm), plant, bracts, and rachis dry biomass (t ha-1); number of bracts, rows per ear, grain per row, grains per ear, and grain yield (GY, t ha-1). Results: Sowing densities influence the morphological response of plants, ears, and GY. The treatment with 80,000 plants ha-1 recorded a GY of 4.75 t ha-1 in traditional systems in Tabasco --greater than the regional average of 1.94 t ha-1. Study Limitations/Implications: The architecture of native corn allows an increase in productivity, as a result of the use of high densities. Findings/Conclusions: Although treatments with greater sowing distances obtained a lower number of grains per ear, this phenomenon is compensated by the greater number of plants per row that leads to higher grain yields. [ABSTRACT FROM AUTHOR]

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 NO3 - () and ammonium NH4 + () 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 NO3- and NH4+ and were therefore considered the best treatments. All treatments were classified as mature composts, rich in organic matter, with alkaline pH, and made of steady materials. [ABSTRACT FROM AUTHOR]