| Registro completo |
| Provedor de dados: |
Rev. Bras. Frutic.
|
| País: |
Brazil
|
| Título: |
Spad index for diagnosis of nitrogen status in ‘Esmeralda’ peach
|
| Autores: |
Benati,Jorge Atílio
Nava,Gilberto
Mayer,Newton Alex
|
| Data: |
2021-01-01
|
| Ano: |
2021
|
| Palavras-chave: |
Prunus persica
Nitrogen fertilization
Chlorophyll meter
Leaf mineral composition
|
| Resumo: |
Abstract The objective of this research was to evaluate the technical feasibility of SPAD index in the diagnosis of N status in ‘Esmeralda’ peach. The field trial, with five N rates applied to the soil (0, 40, 80, 120 and 160 kg ha-1 of N as urea form) was conducted in a randomized block design with four replications. During the years 2014, 2015, 2016 and 2017, SPAD readings were carried out with a Minolta SPAD-502 chlorophyll meter, in the leaf middle part, in 40 leaves per plot. The leaf N content determination was performed in CHN-S Elemental Analyzer. SPAD index and leaf N content increased in a linear way in response to increasing N rates applied in soil. There was a positive linear correlation between SPAD index and N concentration in leaves (0.652; 0.756; 0.762 and 0.767, p<0.05). SPAD index can be used for nutritional N diagnosis purpose in peach when readings are taken between the 13th and 15th weeks after full bloom. In the range between 39 and 49, the SPAD index indicates the leaf N content is included in “normal” class (33 – 45 g kg-1) of agronomic interpretation for the States of Rio Grande do Sul and Santa Catarina, Brazil.
|
| Tipo: |
Info:eu-repo/semantics/article
|
| Idioma: |
Inglês
|
| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452021000103002
|
| Editor: |
Sociedade Brasileira de Fruticultura
|
| Relação: |
10.1590/0100-29452021093
|
| Formato: |
text/html
|
| Fonte: |
Revista Brasileira de Fruticultura v.43 n.1 2021
|
| Direitos: |
info:eu-repo/semantics/openAccess
|
