<p>For the replanting of the sugarcane crop, plants produced from buds of different reserve sizes and from different positions on the stem are used, without up to now an optimum reserve and position size has been determined to obtain a quality plant. Therefore, five treatments were evaluated for nutritional reserve: T1 (short reserve), T2 (without reserve), T3 (half reserve), T4 (long basal reserve) and T5 (long reserve superior) and for the position a design was used 2x3 factorial (two cultivars: MEX69-290 and COLPOSCTMEX05-223 and three yolk positions: basal, middle and apical), the treatments were distributed in a completely randomized arrangement. The buds were sown in unicel vessels with a liter capacity and sifted sand was used as substrate. It was evaluated; emergency percentage, root length and plant height. The results indicate that the use of buds with different positions in the stem is possible to produce seedlings of good quality, since more than 50% of sprouting was obtained in both cultivars. The results on nutrient reserves showed that T3 had the longest root length (36.2 cm) and T1 had the highest plant height (61.4 cm), showing that there is no direct relationship between plant height and root length. To obtain a quality plant it is enough to use short buds or half reserve and any position. For the commercial production of plants, it is recommended to plant in substrates rich in nutrients.</p>

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.