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.
Hauser, Michael (author), Lindtner, Mara (author), Prehsler, Sarah (author), Probst, Lorenz (author), and University of Natural Resources and Life Sciences, Austria
Format:
Online journal article
Publication Date:
2016-07-30
Published:
Austria: Science Direct
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 109 Document Number: D10962
9 pages, via online journal, Farmers who engage in farmer participatory research (FPR) change their established social roles in households and communities. As such, comprehension of farmers’ role transitions is important to understand the extrinsic and intrinsic factors impeding or supporting the uptake and use of FPR by farmers. The existing FPR literature, however, does not address such role transitions. In this study, we analyzed farmers’ experiences with FPR and underlying role transitions in a commercial organic agriculture project in western Uganda. We drew on quantitative and qualitative data from interviews, group discussions, and observations involving farmers and extension workers. Our results suggest extrinsic and intrinsic factors affect farmers’ self-conception, influencing their willingness to participate in FPR. The level of alignment between the self-conception and the anticipated role determines farmers’ decision regarding participation in FPR and affects their response pattern. Farmers’ response pattern and individual set of inhibitors and facilitators lead to the experience of role insufficiency or role mastery, which is crucial for farmers’ continuation or termination of on-farm experiments. Understanding and facilitating role transitions is, therefore, essential for sustaining on-farm experiments, which complements current technical FPR training.
