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Kate A. Ivancic, Matthew D. Ruark, Francisco J. Arriaga and Erin M. Silva

by differences in agronomically optimum N rates determined by nonlinear regression. Specific study objectives were 1) to measure spring-planted cover crop growth and N content, and 2) to determine the impact of spring planted cover crops on sweet corn

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Juan Carlos Díaz-Pérez, Jesús Bautista, Gunawati Gunawan, Anthony Bateman and Cliff Martin Riner

with increasing fertilization rates from ≈311 to 144 kg·kg −1 N ( Fig. 7A ). Marginal yield decreased linearly with increasing N rates ( Fig. 7B ). Fig. 7. Agronomic efficiency of nitrogen ( A ) and marginal yield ( B ) of sweet onion plants as

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R.E. Zartman, L. Rosado-Carpio and R.H. Ramsey

Journal Article no. T-4-290 from the Agronomy, Horticulture, and Entomology Dept. of Texas Tech Univ., Lubbock, TX 79409-2122.

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Timothy L. Grey, Glenn R. Wehtje, Ben F. Hajek, Charles H. Gilliam, Gary J. Keever and Patrick Pace

1 Graduate research associate, Dept. of Agronomy and Soils. 2 Associate professor, Dept. of Agronomy and Soils. 3 Professor, Dept. of Agronomy and Soils. 4 Professor, Dept of Horticulture. 5 Former graduate research associate, Dept. of Agronomy and

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Etienne L. LeRiche, Gefu Wang-Pruski and Valtcho D. Zheljazkov

cultivar, fertilizer, and tuber segment on the element distribution of tubers. The concentration of elements in tubers can be affected by both agronomic treatments ( Haase et al., 2007 ; Mondy and Ponnampalam, 1986 ; Warman and Havard, 1998 ; White et

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Laurie E. Drinkwater, Deborah K. Letourneau, Fekede Workneh, Marita Cantwell, Ariena H.C. van Bruggen and Carol Shennan

Twenty commercial tomato production systems were compared in a multidisciplinary on farm study. The aim was to determine if organic (ORG) and conventional (CNV) systems differed in terms of agronomic criteria or indicators of underlying ecological characteristics. Field level measures of inputs, yields, fruit quality, arthropod abundance and management operations were made. Also, multiple samples within each field were taken to measure soil chemical and physical properties, root pathogen populations, disease incidence, and pest damage levels for multivariate analysis. Management effects on agronomic criteria (yield, fruit quality, pest damage) were small, whereas differences in soil N pools, microbial activity, pathogen populations and arthropod communities between ORG and CNV sites were sufficiently robust to be distinguished from site to site variation. Relationships between management, crop productivity and fruit quality will be discussed.

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Shahrokh Khanizadeh and Jamshid Ghavami

UniBase is a Windows-based (95, 98, NT, 2000, or XP) user-friendly software package that was developed for those who are interested in creating their own instant databases, add information to an existing databases or import data and images from Excel in a choice of languages. The software is very useful for germplasm inventory (fruit crops, vegetables, ornamentals, agronomic crops, weeds, chemicals, insects, pests, animals, etc.) and can be used in any breeding program (animal, horticulture, agronomy, etc.) to trace pedigrees and view images and characteristics of progenies. The database can be searched using various criteria and the use of several operators. An unlimited number of images can be stored for each entry and several graphic formats including BMP, JPEG, GIF, TIFF, etc., can be used. Additional information on UniBase and available data and images can be obtained from the authors.

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I. Papageorgiou, P. Giaglaras and E. Maloupa

This paper is a portion of a MSc thesis submitted by I. Papageorgiou. The experimental part was executed at the Agricultural Research Centre of Macedonia and Thrace and financed by the Mediterranean Agronomic Institute of Chania (MAICH

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E.A. Guertal and J.H. Edwards

1 Assistant Professor, Agronomy and Soils. 2 Adjunct Associate Professor, Agronomy and Soils. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be

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José M. López-Aranda, Carmen Soria, Luis Miranda, José F. Sánchez-Sevilla, Josefa Gálvez, Rosalía Villalba, Fernando Romero, Berta De Los Santos, Juan J. Medina, Javier Palacios, Emilio Bardón, Antonio Arjona, Antonio Refoyo, Anselmo Martínez-Treceño, Antoñeta De Cal, Paloma Melgarejo and Rafael Bartual

Aguedilla is a short-day strawberry (Fragaria ×ananassa Duch.) cultivar obtained by the Spanish public breeding program (Agreement CC01-0008-F1). 'Aguedilla' produces excellent extra-early, early, mid-season, and late-season large-sized, wedge-shaped fruit, and a low percentage of second quality fruit. An agronomic and sensorial characterization of this new cultivar, in comparison with the well-adapted cultivars 'Camarosa', 'Medina', and 'Ventana', was undertaken during the 2002–03 and 2003–04 crop seasons.