8 pages, via Online journal, The use of tomato (Solanum lycopersicum) grafting is gaining traction across the United States, but small-scale growers face the challenge of creating optimum postgrafting healing conditions. The practice of blocking light for a period of 2 to 4 days while maintaining high humidity is commonly recommended for healing grafted tomato transplants; however, research is exploring alternatives to this practice. The present study investigated a low-input healing method for grafted tomato transplants with a specific focus on light and the use of propagation heat mats to regulate substrate and healing chamber air temperatures during the 7-day healing process. We hypothesized that 4 days of light exclusion and the use of propagation heat mats would improve grafted tomato transplant survival and growth. ‘Cherokee Purple’ was used as the scion and ‘RST-04-106-T’ was used as the rootstock. The whole plot factor was heat [propagation mats set at 80 °F (heat) or no propagation mat (no heat)] and the subplot factor was light exclusion (0, 4, or 6 days of dark). The highest survival rate among treatments was 97% in 0 days of dark with no heat treatment; survival decreased to 84% in 4 and 6 days of dark with no heat treatments. The plant survival rate was 96% with 0 days of dark and heat treatment; however, the survival rates were 63% and 45% for the 4- and 6-day dark treatments, respectively. The scion stem diameter was largest for transplants grown in 0 days of dark, but there was no difference in stem diameter due to heat treatments. There were no differences among scion or rootstock biomasses due to heat or light treatments. These results demonstrate that propagation mats set at 80 °F to regulate the substrate temperature were detrimental to grafted transplant survival under extended periods of light exclusion. However, this finding creates the basis to explore lower levels of substrate temperature modification. Our work also indicates that light exclusion may not be necessary for healing grafted tomato plants regardless of root-zone temperature treatments. Future work should examine the interactions of various substrate and air temperatures under full light conditions and their effects on grafted tomato transplant survival and growth. This work contributes to the ongoing research of how to optimize low-input healing methods that may be readily adopted by small-scale tomato growers.
Kristjanson, P (author), Place, F (author), Franzel, F (author), Thornton, P.K. (author), and International Livestock Research Institute, Nairobi, Kenya
International Centre for Research on Agroforestry, Nairobi, Kenya
Format:
Online journal article
Publication Date:
2002-02-23
Published:
Kenya: Science Direct
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 109 Document Number: D10958
20 pages, via online journal, In this paper we provide evidence to show that farmers' perspectives on poverty processes and outcomes are critical in the early stages of evaluating impact of agricultural research on poverty. We summarize lessons learned from farmer impact assessment workshops held in five African locations, covering three agro-ecological zones and five different agroforestry and livestock technologies arising from collaborative national–international agricultural research. Poverty alleviation is a process that needs to be understood before impact can be measured. Workshops such as those we describe can help researchers to identify farmers' different ways of managing and using a technology and likely effects, unanticipated impacts, major impacts to pursue in more quantitative studies, the primary links between agricultural technology and poverty, and key conditioning factors affecting adoption and impact that can be used to stratify samples in more formal analyses. Farmer workshops inform other qualitative and quantitative impact assessment methods. We discuss the linkage of farmer-derived information with GIS-based approaches that allow more complete specification of recommendation domains and broader-scale measurement of impact.
Subair, Stephen K. (author / University of Botswana Library)
Format:
Proceedings
Publication Date:
2001-04-04
Published:
Africa: Association for International Agricultural and Extension Education
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 138 Document Number: C20943
Notes:
Burton Swanson Collection, pages 357-363, from "Emerging trends in agricultural and extension education", AIAEE 2001, Proceedings of the 17th Annual Conference, April 4-7, 2001, Baton Rouge, Louisiana, USA
Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: C14396
Notes:
Chapter 2 in Gordon Prain, Sam Fujisaka and Michael D. Warren (eds.), Biological and cultural diversity: the role of indigenous agricultural experimentation in development. Intermediate Technology Publications, London. 1999. 218 pages
