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

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.

Bibliographic Details

Main Authors:	OLIVEIRA, S. M. de, PIEROZAN JUNIOR, C., LAGO, B. C., ALMEIDA, R. E. M. de, TRIVELIN, P. C. O., FAVARIN, J. L.
Other Authors:	SILAS MACIEL DE OLIVEIRA, ESALQ; CLOVIS PIEROZAN JUNIOR, INSTITUTO FEDERAL DE EDUCAÇÃO, Palmas-TO; BRUNO COCCO LAGO, ESALQ; RODRIGO ESTEVAM MUNHOZ DE ALMEIDA, CNPASA; PAULO CESAR OCHEUZE TRIVELIN, CENA; JOSE LAERCIO FAVARIN, ESALQ.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2019-05-14
Subjects:	Soja, Glycine Max, Nitrogênio, Fertilizante Nitrogenado, Soybeans, Foliar application, Nitrogen fertilizers,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1109020
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