Evaluation of Popcorn Hybrids for Nitrogen Use Efficiency and Responsiveness

Agronomy

Freddy Mora¹  GabrielleSousa Mafra²  FabioTomaz de Oliveira²  GabrielMoreno Bernardo Gonçalves²  KátiaFabiane Medeiros Schmitt²  DivinoRosa dos Santos Junior²  SamuelHenrique Kamphorst²  PedroHenrique Araújo Diniz Santos²  JanieliMaganha Silva Vivas²  AntônioTeixeira do Amaral Júnior²  Adrianodos Santos²  Shahid Khan² 

[1] Institute of Biological Sciences, University of Talca, Av. Lircay, s/n, Talca 3460000, Chile;Plant Breeding Laboratory, Agricultural Science and Technology Center, Darcy Ribeiro State University of Northern Rio de Janeiro, Av. Alberto Lamego, 2000, Campos dos Goytacazes, RJ 28013-602, Brazil;

关键词: abiotic stress;    nitrogen-use efficiency;    sustainability;    grain yield;    plant breeding;   

DOI  :  10.3390/agronomy10040485

来源: DOAJ

【 摘 要 】

The global boom in agricultural production has been associated with the exponential increase of nitrogen (N) fertilizer application. This heavy use of nitrogen in agriculture has caused negative impacts on the environment. Therefore, new alternatives are needed to maintain or increase maize yield but reduce the environmental impact. For this purpose, one possibility is to plant N-use efficient (NUE) cultivars. In this context, the objective of this study was to identify popcorn hybrid cultivars that are highly NUE and N-responsive, bred from crosses between inbred lines with contrasting levels of N-use efficiency. For this purpose, 90 hybrids were evaluated in a 10 × 10 triple lattice design at two sites and two levels of N availability (low and ideal availability). The results indicated that for the environment with low nitrogen availability, the lack of nitrogen reduced the chlorophyll content, extended the interval between male and female flowering, and affected the performance of the tested hybrids. However, we observed the existence of hybrids with greater efficiency than the responsiveness to nitrogen and with high productivity. These can even be used on farms where the level of production inputs is low, thus contributing to ensure food security.

【 授权许可】

Unknown