GRAIN YIELD AND QUALITY OF IRRIGATED HYBRID RICE IN RESPONSE TO NITROGEN RATES AND APPLICATION MANAGEMENT
DOI:
https://doi.org/10.66104/3fxxvm76Keywords:
Irrigated rice;, nitrogen fertilization;, grain yield;, grain quality;, nitrogen management;Abstract
The productivity of irrigated rice is influenced by several factors, particularly cultivar, environmental conditions, and nitrogen fertilization, especially regarding application rates and timing. This study aimed to evaluate the performance of the irrigated rice hybrid XP739MA in response to different nitrogen rates and the splitting of nitrogen applications at distinct crop development stages. The experiment was conducted in the Central Depression region of Rio Grande do Sul, Brazil, in an area representative of the edaphoclimatic conditions of irrigated rice production. The experimental design was a randomized complete block with four replications in a 3×2×2 factorial arrangement, consisting of three nitrogen rates (50, 100, and 150 kg ha⁻¹), two nitrogen splitting levels (70–30% and 80–20%), and two application timing strategies (V3–V8 and V3–R2). The evaluated variables included plant height, number of stems m⁻², lodging, grain yield, and grain physical quality attributes. The results showed that plant height, number of stems m⁻², and grain yield were significantly affected only by nitrogen rates, with no significant influence of nitrogen splitting or application timing. No lodging was observed during the evaluated growing season. The highest grain yield was obtained with 150 kg N ha⁻¹, reaching 13,747 kg ha⁻¹, while the maximum technical efficiency dose was estimated at 137 kg N ha⁻¹, corresponding to a yield of 13,515 kg ha⁻¹. Grain physical quality was also influenced by nitrogen rates, particularly for chalky grains, whole grains, and broken grains. Nitrogen rates of 100 and 150 kg ha⁻¹ reduced the incidence of chalkiness and broken grains and increased the percentage of whole grains. It is concluded that increasing nitrogen rates improves the agronomic performance and grain quality of the hybrid, with no significant effect of nitrogen splitting or application timing
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Copyright (c) 2026 Eduardo Pauletto, Guilherme Pivetta Vizzotto, Régis Ruoso, Matheus dos Santos Avozani, Guilherme Bueno Cabreira, Robson Giacomeli, Juliano martins
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