AGRONOMIC PERFORMANCE OF MAIZE INTERCROPPED WITH RUZIGRASS UNDER SPLIT DOSES OF A CALCIUM POLYSULFIDE-BASED FOLIAR FERTILIZER
DOI:
https://doi.org/10.36725/agries.v12i2.11349Keywords:
Sulfur, second crop, Zea mays LAbstract
The aim of this study was to evaluate the effect of doses and split applications of calcium polysulfide (CP) applied as a foliar spray on agronomic traits of second-crop maize (Zea mays L.) intercropped with signal grass (Urochloa ruziziensis). This evaluation is relevant due to the scarcity of information on the use of calcium polysulfide in second-crop maize intercropped with signal grass, especially regarding its possible effects on the agronomic performance of the crop. The experiment was conducted under field conditions, in a maize–signal grass intercropping area, using a randomized complete block design in a 5 × 2 factorial scheme, with four replications. The treatments resulted from the combination of five CP doses (0, 2, 4, 6, and 8 L ha⁻¹) and two split-application schemes (three or four applications). Sowing was carried out on 08/02/2025, using the hybrid MG593PWU, at 0.45 m row spacing, while the signal grass was broadcast sown at maize planting. Spraying was performed with a CO₂-pressurized backpack sprayer, beginning at the V3 phenological stage of
the maize crop, at 15-day intervals in the three-application scheme and 12-day intervals in the four-application scheme. Harvest and evaluations were carried out on 02/07/2025. Plant height (PH), stem diameter (SD), number of rows per ear (NRE), number of grains per row (NGR), 100-grain weight (HGW), and grain yield (GY) were evaluated. There was no significant effect of doses, split applications, or the interaction between factors for any of the variables evaluated. The observed means were: GY = 5.13 Mg ha⁻¹, PH = 1.92 m, SD = 20.78 mm, NRE = 15.32, NGR = 30.24, and HGW = 38.44 g. It was concluded that, under the conditions of this study, foliar application of CP, at the evaluated doses and split-application schemes, did not alter the agronomic performance of second-crop maize intercropped with ruzigrass (Urochloa ruziziensis).
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