Simulação do manejo do nitrogênio em arroz de terras altas com o modelo ORYZA/APSIM 2000
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Data
2012
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Resumo
It is important to define nitrogen management strategy for upland rice crop, because nitrogen is the
nutrient more absorbed by rice plants and, due to the ease of leaching in soil, it can pollute the environment.
This study aimed to simulate, based on ORYZA/APSIM 2000 model, different strategies for nitrogen
fertilization management to maximize the productivity and minimize the N leaching. In the simulation,
five application modes with an application rate of 100 kg N ha -1 were considered: TP - 1/5 at sowing,
2/5 at the beginning of tillering (T) and 2/5 at panicle differentiation (P); T1 - all at sowing; T2 - all at 20
days before sowing; T3 - 1/5 at sowing and 4/5 at T and T4 - 1/5 at sowing and 4/5 at P. Application
modes were combined with five sowing dates: 01/11, 15/11, 01/12, 15/12 and 31/12. Nitrogen fertilizer
split applications showed to be the strategy most likely to result in high yields of upland rice. When this
strategy is not used, the probability of nitrogen losses by leaching is higher. There is higher probability of
obtaining higher yields in the earliest sowing dates, from 01/11, despite the late sowing contribute to
reduction in nitrogen losses by leaching.
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Palavras-chave
Oryza sativa, Data de semeadura, Adubação nitrogenada, Lixiviação de N, Oryza sativa, Sowing date, Nitrogen fertilization, N leaching
Citação
STONE, Luís F.; HEINEMANN, Alexandre B. Simulação do manejo do nitrogênio em arroz de terras altas com o modelo ORYZA/APSIM 2000. Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 16, n. 6, p. 611-617, 2012.