High Tunnel Pole Bean Production in 2008

This report on pole bean production was originally published in the 2008 Annual Progress Reports for the Horticulture Research Station (ISRF 0008-36)

High Tunnel Colored Pepper Production in 2008

This report on colored pepper production was originally published in the 2008 Annual Progress Reports for the Horticulture Research Station (ISRF 0008-36)

High Tunnel Tomato Production in 2007

This report on tomato production was originally published in the 2007 Annual Progress Reports for the Armstrong Research and Demonstration Farm. Learn more about the Tunnels to Tables project

High Tunnel Pepper Production in 2007

This report on pepper production was originally published in the 2007 Annual Progress Reports for the Armstrong Research and Demonstration Farm. Learn more about the Tunnels to Tables project

High Tunnel Pole Bean Evaluation

There are two major types of green beans: bush or pole. Bush are short, erect plants (determinate) with a uniform pod set resulting in a short harvest season. Pole beans are trained on poles, fence, or string, and grow 7 to 8 ft in height and bear fruit continuously (indeterminate) requiring only one field planting. Further, the consumer perceives pole beans, with its longer pod, to be of superior quality. Our objective was to evaluate two pole bean varieties: Fortex, an extra long pod (11 in.) 60 day maturity, and Blue Lake, a standard pole bean variety, 6 to 7 in. round pod with 55-day maturity. Also, we wished to compare high tunnel production with field production and obtain two crops in the high tunnel by double cropping

High Tunnel Tomato, Pepper, and Bean Observations

Previous vegetable trials (2006 through 2008) concentrated on tomato and bell pepper variety adaption to early planning (mid-April) in a high tunnel structure. That work indicated growers should use an early, determinate tomato variety as opposed to an indeterminate greenhouse type to gain earlier production in the marketplace. The production of colored bell peppers, from traditional field varieties, was successful but did not allow double cropping because of the maturation time length before fall freeze; and, thus, was not profitable. The use of a greenhouse bell variety with a long harvest period may provide more opportunity for income particularly when using a vertical training system

High Tunnel Colored Pepper Production

Bell pepper varieties developed for unique fruit color characteristics were evaluated as part of the high tunnel project. Previous evaluation of six colored pepper varieties at the Armstrong Research Farm, Lewis, IA and the Horticulture Research Station, Ames, IA in 2007 indicated only Tequila (green to purple) developed full color for commercial production. The major problem seems to be the high daytime temperatures in the tunnel as well as outdoor field production, which produced a high level of rots. Generally, bell peppers take 45 to 55 days from pollination to green market maturity and an additional 15 days to the red stage (70 days total)

High Tunnel Tomato Production

This years’ high tunnel tomato work is a continuation of last year’s variety evaluation research (for a copy of the 2006 progress report see, http://www.public.iastate.edu/~taber/Extension/ Progress%20Rpt%2006/High%20Tunnel%20fin al%20report.pdf. We evaluated 10 varieties in both high tunnel and outdoor field plantings in 2006, and for 2007 selected the top three performing varieties across three maturity classes: early = Sunstart(67 day), 2 nd early = Mountain Fresh (72 day), and main season = Florida 91 (80 day). Our objective was to evaluate a sequential planting scheme using high tunnels and outdoor field plantings to maintain a continuous market supply

Hybridization-induced magnetism in correlated cerium systems

There is a great change in the nature of the magnetic ordering on going from CeIn3, a local moment antiferromagnetic system, to CePb3, a heavy fermion itinerant antiferromagnetic system, both of which have Cu3Au crystal structure. We have applied ab initio electronic structure calculations, based on the linear-muffin-tin-orbital method, and a phenomenological theory of orbitally driven magnetic ordering, to study the effects of the band-f hybridization-induced interactions and the band-f exchange-induced interactions, pertinent to the magnetic behavior of these systems. The position of the Ce 4 f energy level relative to the Fermi energy and the intra-atomic Coulomb interaction are obtained from a sequence of three total-energy supercell calculations with two, one and zero f electrons in the Ce 4 f core. The calculations elucidate the origins in the electronic structure of the variation of the f-state resonance width characterizing the strength of the hybridization and the density of states at the Fermi energy characterizing the number and character of band states available for hybridization. We present results for the hybridization potential and the hybridization-induced exchange interactions on going from CeIn3 to CePb3, where the only obvious change is the addition of an anion p electron