Monitoring and evaluation of need for nitrogen fertilizer topdressing for maize leaf chlorophyll readings and the relationship with grain yield
AUTOR(ES)
Silva, Maria Anita Gonçalves da, Muniz, Antonio Saraiva, Mannigel, Anny Rosi, Porto, Simone Maria Altoé, Marchetti, Marlene Estevão, Nolla, Antonio, Grannemann, Ivan
FONTE
Brazilian Archives of Biology and Technology
DATA DE PUBLICAÇÃO
2011-08
RESUMO
The study was carried out for two years in maize in succession to the wheat using no tillage system in a distroferric Red Latosol (Hapludox). Methods of management nitrogen fertilizer (120 kg ha-1) with ammonium sulphate were studied; the fertilizer was applied in maize sowing or in maize topdressing, and N with previous application in wheat sowing. In addition, leaf chlorophyll reading was used as an indicator for the need for topdressed nitrogen fertilizer. Nitrogen supply index (NSI) was shown to be effective at predicting need for topdressed nitrogen fertilizer for maize. The application of N improved the yield of the maize independent of the management system. The flowering stage was carried out at the appropriate time in order to estimate the nitrogen nutrition state and yield of maize using the relative chlorophyll level (RIC).
Documentos Relacionados
- Timing and growing conditions of nitrogen topdressing influence the grain yield and protein content of four wheat cultivars
- Crop systems and topdressing nitrogen on grain yield and technological attributes of common bean under no-tillage
- Genetic control of grain yield and nitrogen use efficiency in tropical maize.
- Effects of plant population and nitrogen fertilizer on yield and efficiency of maize-bean intercropping.
- Nitrogen top-dressing fertilization of maize cultivated in single and twin-row systems