boro e estresse hídrico na produção do girassol boron and water stress on yield of sunflower

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ID: 234617
2006
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Abstract
Com este trabalho, objetivou-se estudar sob condições de casa-de-vegetação, o efeito da interação doses boro e estresse hídrico na produção de matéria seca total, produção de aquênios e conteúdo de óleo em girassol cultivado em Latossolo Vermelho Amarelo distrófico de textura média. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial 4 x 4, com quatro repetições. Foram estudadas quatro doses de B: 0, 0,25, 0,5 e 2,0 mg kg-1, aplicado na forma de ácido bórico e quatro fases de controle de umidade: sem estresse hídrico durante o ciclo, com estresse hídrico durante o ciclo, estresse hídrico a partir do florescimento e estresse hídrico a partir do enchimento de aquênios. Os resultados mostraram que, independentemente da fase de aplicação ou não de estresse hídrico, a dose 0,5 mg dm-3 de B acarretou na maior produção de matéria seca total, produção de aquênios e rendimento de óleo por capítulo. A aplicação de estresse hídrico a partir do início do florescimento ou no enchimento de aqûenios acarreta em menor produção de matéria seca total, de aquênios e de óleo.
The objective of this work was to study under greenhouse conditions, the effect of the interaction between boron rates and phases of water stress on total dry matter production, achene production, oil content and development of sunflower tillage in dystrophic Red Yellow Latosol of medium texture. The experimental design consisted of casual blocks, using factorial scheme 4x4, with four replicates. The treatments studied were: Four boron rates: 0, 0,25, 0,5 e 2,0 mg kg-1, applied through the boric acid form, and four period of soil water content: without water stress for the whole cycle, with water stress during the whole cycle, with stress after beginning of flowering and with water stress after beginning of grain filling. The results showed that independently of the presence or not of water stress, the 0,5 mg dm-3 of B was the best rate which presented the highest total dry matter production, achenes production and oil production. The absent water in soil after beginning of flowering and beginning of achenes filling resulted in small production of total dry matter, of achenes and of oil.
Reference Key
castro2006cinciaboro Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;César de Castro;Adônis Moreira;Ricardo Ferraz de Oliveira;Antonio Roque Dechen
Journal information and software technology
Year 2006
DOI
10.1590/S1413-70542006000200004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542006000200004
Keywords
greenhouse helianthus annuus mineral nutrition oil content

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