Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (4)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by LANCASTER, J. E.
Right arrow Articles by GANDAR, P. W.
Right arrow Search for Related Content
PubMed
Right arrow Articles by LANCASTER, J. E.
Right arrow Articles by GANDAR, P. W.
Agricola
Right arrow Articles by LANCASTER, J. E.
Right arrow Articles by GANDAR, P. W.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Annals of Botany 78: 423-430, 1996
© 1996 Annals of Botany Company

Bulbing in Onions: Photoperiod and Temperature Requirements and Prediction of Bulb Size and Maturity

J. E. LANCASTER, C. M. TRIGGS, J. M. DE RUITER and P. W. GANDAR

New Zealand Institute Crop & Food Research, Private Bag 4704, Christchurch Statistics Dept, University of Auckland, Private Bag 92019, Auckland New Zealand Institute for Horticulture and Food Research, Private Bag, Palmerston North, New Zealand

April 24, 1995 ; February 27, 1996

Bulb size and maturity are key characteristics of an onion crop and the onset of bulbing is an important determinant of these. In this paper we describe an experiment in which bulb and neck diameter and leaf number were measured in onion crops (cultivars Pukekohe Longkeeper and Early Longkeeper) with different sowing dates planted at two different locations in New Zealand. A sensitive indicator of earliest time of bulbing was developed using the ratio of bulb and neck diameters and the statistical technique of cusums. Bulb diameter at bulbing was related to thermal time accumulated prior to bulbing. Bulbing only occurred when dual thresholds of a minimum thermal time of 600 degree days and a photoperiod of 13.75 h were reached. Mathematical relationships were developed between leaf number, sowing date, bulbing date and bulb growth and maturity. Final bulb size could be predicted from bulb size at bulbing and number of leaves produced after bulbing. Bulb maturity date could be predicted by number of leaves after bulbing.

Allium cepa L.; onion; temperature; photoperiod; bulb-neck ratio; leaf number; bulbing


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.