Data/hora: 31/05/2024 12:05:48

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 17/01/2003
Data da última atualização: | 14/11/2018
Autoria: | FONTES, P. C. R.; RONCHI, C. P.
Afiliação: | Paulo Cezar Rezende Fontes, Universidade Federal de Viçosa - UFV; Cláudio Pagotto Ronch, Universidade Federal de Viçosa - UFV/Departamento de Fitotecnia.
Título: | Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures.
Ano de publicação: | 2002
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 10, p. 1421-1429, out. 2002
Idioma: | Inglês
Notas: | Título em português: Níveis críticos de índices de nitrogênio no tomateiro em solo e solução nutritiva determinados por diferentes procedimentos estatísticos.
Conteúdo: | The objective of this study was to establish critical values of the N indices, namely soil-plant analysis development (SPAD), petiole sap N-NO3 and organic N in the tomato leaf adjacent to the first cluster (LAC), under soil and nutrient solution conditions, determined by different statistical approaches. Two experiments were conducted in randomized complete block design with four repli-cations. Tomato plants were grown in soil, in 3 L pot, with five N rates (0, 100, 200, 400 and 800 mg kg-1) and in solution at N rates of 0, 4, 8, 12 and 16 mmol L-1. Experiments in nutrient solution and soil were finished at thirty seven and forty two days after transplanting, respectively. At those times, SPAD index and petiole sap N-NO3 were evaluated in the LAC. Then, plants were harvested, separated in leaves and stem, dried at 70oC, ground and weighted. The organic N was determined in LAC dry matter. Three statistical procedures were used to calculate critical N values. There were accentuated discrepancies for critical values of N indices obtained with plants grown in soil and nutrient solution as well as for different statistical procedures. Critical values of nitrogen indices at all situations are presented.
Palavras-Chave: | adubo nitrogenado; plant soil relations; relação planta-solo.
Thesagro: | Análise Estatística; Lycopersicon Esculentum.
Thesaurus Nal: | nitrogen fertilizers; statistical analysis.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/24062/1/1421.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (24062-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS