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Grain yield, efficiency and the allocation of foliar N applied to soybean canopies

Oliveira, Silas Maciel de; Pierozan Junior, Clovis; Lago, Bruno Cocco; Almeida, Rodrigo Estevam Munhoz de; Trivelin, Paulo Cesar Ocheuze; Favarin, José Laércio.
Sci. agric.; 76(4): 305-310, July-Aug. 2019. ilus, tab, graf
Artigo em Inglês | VETINDEXEXPRESS | ID: vti-740884
Soybean [Glycine max (L.) Merr.] grain yield is closely associated with the level of optimal nitrogen (N) supply, especially during the reproductive stages. Foliar fertilization with low rates of N have been considered as a strategy for furnishing additional N and enhancing grain yields. Field studies using 15N tracer were conducted over two growing seasons to investigate the impact of foliar N fertilization on grain yield, plant N content, the amount of N derived from fertilizer (NDFF) and N recovery efficiency (NRE). Four foliar N rates (0, 1300, 2600 and 3900 g ha−1) were supplied by two equal split applications at the R1 and R3 stages. Foliar N fertilization of soybean canopies did not affect grain yield, grain N content, shoot N content nor plant N content. Total NDFF was increased from 0.7 to 2.0 kg ha−1 across the N rates. Nonetheless, NRE was unaffected by foliar N fertilization, which averaged 53 %. Soybean plants allocated the same amount of N fertilizer to both grains and shoots. No significant effects of low rate foliar N fertilization were registered on soybean grain yield nor plant N content, despite considerable N fertilizer recovery by plant organs.(AU)
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