TY - JOUR
T1 - Nitrogen use efficiency and recovery in a wheat-corn rotation under tropical savannah conditions
AU - Galindo, Fernando Shintate
AU - da Silva, Edson Cabral
AU - Pagliari, Paulo Humberto
AU - Fernandes, Guilherme Carlos
AU - Rodrigues, Willian Lima
AU - Biagini, Antônio Leonardo Campos
AU - Baratella, Eduardo Bianchi
AU - da Silva Júnior, Castro Alves
AU - Moretti Neto, Mário João
AU - Muraoka, Takashi
AU - Teixeira Filho, Marcelo Carvalho Minhoto
N1 - Funding Information:
This study was funded by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), Grant Number 2018/08485-7, and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), Award Number 312359/2017-9.
Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - Stable isotopes (e.g., 15N) can be used to develop best practices for fertilizer management in cereal crops under tropical conditions. The objectives of this study were to determine the N contribution from fertilizer and soil to wheat and corn grown in rotation and the residual N contribution from fertilizer applied to wheat and carried over to corn under Brazilian savannah conditions. This study was established in a no-till system on Rhodic Haplustox soil in a randomized complete block design with four replications. The N treatments applied to the wheat crops were 0, 20, 40, 60, 80 and 160 kg (urea-15N) ha−1. The residual effects of N on the succeeding corn crop were evaluated. During the corn phase, two additional treatments were included: a control (0 N) and a treatment with 160 kg N ha−1. Regression analysis showed that the highest estimated wheat yield (5415 kg ha−1) was observed with the application of 114 kg N ha−1. Significant effects from the residual N were observed in the corn shoot biomass and straw N uptake. On average, the recovery rate of the urea N fertilizer was 34% for wheat, and the residual urea N fertilizer use in corn (when applied to wheat) was less than 5% of the amount initially applied. The effect of the residual N was not enough to meet the N demands of the succeeding corn crop. The results of this study provide producers and the scientific community with good estimates of nitrogen use efficiency for wheat and corn.
AB - Stable isotopes (e.g., 15N) can be used to develop best practices for fertilizer management in cereal crops under tropical conditions. The objectives of this study were to determine the N contribution from fertilizer and soil to wheat and corn grown in rotation and the residual N contribution from fertilizer applied to wheat and carried over to corn under Brazilian savannah conditions. This study was established in a no-till system on Rhodic Haplustox soil in a randomized complete block design with four replications. The N treatments applied to the wheat crops were 0, 20, 40, 60, 80 and 160 kg (urea-15N) ha−1. The residual effects of N on the succeeding corn crop were evaluated. During the corn phase, two additional treatments were included: a control (0 N) and a treatment with 160 kg N ha−1. Regression analysis showed that the highest estimated wheat yield (5415 kg ha−1) was observed with the application of 114 kg N ha−1. Significant effects from the residual N were observed in the corn shoot biomass and straw N uptake. On average, the recovery rate of the urea N fertilizer was 34% for wheat, and the residual urea N fertilizer use in corn (when applied to wheat) was less than 5% of the amount initially applied. The effect of the residual N was not enough to meet the N demands of the succeeding corn crop. The results of this study provide producers and the scientific community with good estimates of nitrogen use efficiency for wheat and corn.
KW - Efficiency of nitrogen fertilization
KW - Nitrogen-15
KW - Residual effect of N
KW - Triticum aestivum L
KW - Zea mays L
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U2 - 10.1007/s10705-020-10115-4
DO - 10.1007/s10705-020-10115-4
M3 - Article
AN - SCOPUS:85100137877
SN - 1385-1314
VL - 119
SP - 291
EP - 305
JO - Nutrient Cycling in Agroecosystems
JF - Nutrient Cycling in Agroecosystems
IS - 3
ER -