Progress 10/01/06 to 09/30/07
Outputs
Progress Report Objectives (from AD-416) 1. Compare the timing of tassel emergence, silk emergence, and pollen shed across hybrids from eras (decades) from 1955 through 2005. 2. Develop a conceptual model to document and describe the relationships of tassel emergence (VT), silk emergence (R1) and pollen shed (VA) across ERA hybrids. Approach (from AD-416) Use current and historical data from ARS and Pioneer experiments to determine if the relationship between anthesis, tasseling (VT), silking (R1) have changed with development of modern corn hybrids. Use these observations and knowledge of development in other grasses to create algorithms describing phenology in corn. Significant Activities that Support Special Target Populations This report documents research conducted under a Non-Funded Cooperative Agreement between ARS and Pioneer Hi-Bred International Inc. Additional details of research can be found in the report for the in-house associated project 5440-12130-010-00D, Crop and soil management systems for water quality protection and agricultural sustainability. A draft manuscript, describing a more accurate method of reporting anthesis in corn, has been prepared by ARS and Pioneer scientists. Adding the new stage (VA) to the identified stages of development for corn will make it easier for scientists, practitioners, and farmers to correctly describe the time of pollen shed for a corn plant or corn canopy. Progress on this project has been monitored by exchange of phone calls, email messages, and draft manuscripts as well as face-to-face meetings.
Impacts
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Progress 10/01/05 to 09/30/06
Outputs
Progress Report 4d Progress report. This report documents research conducted under a non-funded agreement between ARS and Pioneer Hi-Bred International, Inc. Additional details of the research can be found in the report for parent CRIS 5440-12130-002- 00D, Crop and Soil Management Systems for Water Quality Protection and Agricultural Sustainability. Greater knowledge of the synchronization between development of tassel and ear in corn is critical to understanding yield limiting processes, appropriate timing for application of cultural practices, and improving accuracy of models used to describe development and growth. Project participants shared and compared conceptual views of inflorescence development. Data from field observations on corn development under a range of growing conditions were assembled for use in comparing, modifying, and developing more widely applicable routines describing corn reproductive development.
Impacts
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