Abstract
ABSTRACT Currently, most nitrogen fertilizer is side-dressed when corn is in the four (V4) to eight (V8) expanded leaf stage. However, recent studies have shown that modern hybrids take up high amounts of nitrogen during grain filling. This indicates that a late nitrogen fertilization, at the time of crop flowering, may be important to optimize corn agronomic performance. This study aimed to evaluate the effect of the timing and splitting of nitrogen side-dress application on the agronomic performance of early [...]
Highlights
Corn is a crop with high yield potential
Recent studies have shown that modern hybrids take up high amounts of nitrogen during grain filling. This indicates that a late nitrogen fertilization, at the time of crop flowering, may be important to optimize corn agronomic performance
This study aimed to evaluate the effect of the timing and splitting of nitrogen side-dress application on the agronomic performance of early corn hybrids in order to achieve high grain yield
Summary
Corn is a crop with high yield potential This has been shown by the yields of 18.6 and 17.4 Mg ha-1 obtained by Menegati et al (2012) and Schmitt et al (2012), respectively, in experiments carried out in the South of Brazil. Corn has low N demand at the early growth stages of its cycle It takes up only 5 to 10 % of total N from crop emergence to floral primordium differentiation, which occurs when the plant has five to six expanded leaves (Sangoi et al, 2016). These two factors make the timing of nitrogen fertilization an essential management strategy to optimize corn N use efficiency
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