Data/hora: 03/06/2024 10:07:29

Provedor de dados: | 75
País: | Brazil
Título: | Nitrogen content, SPAD index and production of single head broccoli
Autores: | Vidigal,Sanzio M; Puiatti,Mário; Lopes,Iza Paula de C; Sediyama,Maria Aparecida N.
Data: | 2021-03-01
Ano: | 2021
Palavras-chave: | Brassica oleracea var. italica; Nutritional diagnosis; Nitrogen fertilization.
Resumo: | ABSTRACT In the management of single head broccoli nitrogen fertilization, there is no study indicating the critical level and adequate range of N content and SPAD index in the leaves to evaluate the nitrogen nutritional status. This work was carried out in two consecutive years with control without N and three rates of N (150; 300 and 450 kg ha-1). The treatments were arranged in the experimental design of random blocks, with four replications. All productive characteristics were significantly influenced by N rates. The fresh inflorescence mass reached a maximum value of 822 g with 308 kg ha-1 N. The critical levels were 61.1 g kg-1 for total N foliar content and 71.31 ud SPAD at 40 DAT. The SPAD index presented high correlations with the total N content in the leaves (r = 0.93; p&lt;0.034) and with the maximum fresh mass of the inflorescence (r = 0.99; p&lt;0.001). The ranges of N content (low ≤52.5; medium 52.6 to 57.4; sufficient 57.5 to 61.1 and high &gt;61.1 g kg-1) and SPAD index (low ≤68.48; medium 68.49 to 70.47; sufficient 70.48 to 71.31 and high &gt;71.31 ud SPAD) are proposed for assessing the N nutritional status of single head broccoli.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100052
Editor: | Associação Brasileira de Horticultura
Relação: | 10.1590/s0102-0536-20210108
Formato: | text/html
Fonte: | Horticultura Brasileira  v.39 n.1 2021
Fonte: | info:eu-repo/semantics/openAccess