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As new wheat cultivars (Triticum aestivum L.) continue to be developed, they enable cultivation in regions experiencing tropical types of climate under conditions of irrigation. However, further studies are necessary to provide details regarding the properties of the nutrients and their behavior under these conditions to advance the plant growth. Therefore, this study aimed at assessing the development of the irrigated wheat in Oxisol, using combined doses of nitrogen and potassium. These fertilizers are added in the tropical areas as a viable alternative to expand the wheat cultivable regions. Adopting the completely randomized block design, the experiment was conducted for two consecutive years in the State of Mato Grosso, Brazil. Five nitrogen doses (0, 70, 140, 210, 280 kg ha -1 ), using urea as the fertilizer, and five potassium doses (0, 50, 100, 150 and 200 kg ha -1 ), using Simple superphosphate as the fertilizer were employed with four replicates. Using the conventional spraying irrigation method, the plant height, number of leaves and tillers, plant lodging and chlorophyll index were assessed. The nitrogen and potassium doses were observed to influence the irrigated BRS 254 wheat in terms of the growth and chlorophyll levels. Potassium expressed the best results for the variables of this study when added alone. The addition of nitrogen demonstrated remarkable results during the second agricultural year.

Nitrogen and potassium fertilization on the development and chlorophyll index of irrigated wheat in the Cerrado, Central Brazil