From jddoll@facstaff.wisc.eduFri Aug 25 21:53:30 1995 Date: Wed, 23 Aug 1995 11:34:17 -0500 From: jerry doll To: sanet-mg@amani.ces.ncsu.edu Subject: Fw: Welcome to WeedNet Last week someone on this network or "graze-L" had a question about a weed network. I've lost track of the original question, but here's the info on the weed network for whoever is interested. Laura Paine University of Wisconsin Agronomy Department ------------------------------ From: Wed, 9 Aug 1995 10:55:33 -0500 To: weednet@iastate.edu Subject: Welcome to WeedNet Several new people requested, and have been added to WeedNet. We are 60. With the amount of traffic we have, and the good dialogue, we could go to 100 or more. For the new people: _____________________________ Welcome to WeedNet The purpose of this interactive e-mail group is to foster an informal exchange about anything to do with weeds, their biology, ecology, management and importance. The initial group is small (22), primarily M.I.N.K. people in the NC US plus some selected other weeders. WeedNet is a MAILLIST, any of us can send a message to: weednet@iastate.edu and it will automatically be sent to everyone on the list. I can add, delete members anytime (1 day delay in activation). WeedNet is served by our computer here at Iowa State University. WeedNet is experimental in the sense that it is not apparent what group dynamic will occur (its all up to us). Let the WeedNet know what you think about any of this. -Jack Dekker wEEDnET server _____________________________ As a periodical exercise I have been repeating the list of questions posed on WeedNet: What examples (past, ongoing, future) can anyone provide of weed biology information being important in weed management? Jack Dekker I need a literature citation in which a farm group or organization says that they like the ideaof bioeconomic weed management models. Frank Forcella Weed evolution--anybody got some good examples? Steven R. Radosevich How many persons are conducting "in-depth" research in weed ecology, globally? Nick Jordan Tthe interaction of nitrogen form and placement in relation to Setaria spp. emergence, growth, development, interference with corn. Experiences, publications, methodologies etc.? Jeff Gunsolus Thermal-gradient table for studying the effect of temperature on weed seed germination. Does anyone have any information about this type of equipment? Jack Dekker Use of flowering of the forsythia bush, is any correlation between its blooming and crabgrass germiniation. Has anyone heard of similar biological indicators for predicting germination of agronomic weeds. Bob Hartzler Has anyone worked with an elutriator for seed cleaning, specifically the Gillison 4- or 8-chamber model (a root cleaning machine, adapted for seed cleaning)? Sheri Huerd, U of M What temperature a homeowner could heat seeds to prevent germination in the lawn. Jodie Holt GPS equipment, straight answers on exactly what we need. We're looking for a hand-held unit with an accuracy of 1-2 meters. Does anyone out there have any experience with Trimble products, or have any other suggestions. Bob Hartzler Comparing responses of weeds (in corn) to point injection of fertilizer versus conventional dry broadcast fertilization. Specifically, information on: 1. Use and applications of point injection of fertilizer with rolling spoke injectors. 2. Applications of point injection of fertilizer in conservation tillage systems. 3. Crop and weed responses to fertilizers applied by point injection. William Akey Heteroskedasticity: If you have several data sets, you may wish to combine them, or do statistics to compare them. The problem is that the variation within each data set will differ. If some data has a lot of variation and other sets have a little, you have heteroskedasticity. For linear regression, there are many ways to detect if this is a problem and established methods to correct it. But I have not been able to find published solutions to the problem for NONLINEAR regression. Milt McGiffen Wild proso millet, shattercane, woolly cupgrass: prototype for a seedling emergence model for wild proso millet based on lab data. We have one year of field data. Predictions and observations match nicely. However, we need one other year of field validation data to be sure the model is working correctly. Anybody have such data? Frank Forcella Spatial distribution of weeds and mapping of fields: maps of seedling emergence and maps of the soil seed bank. Unanswered questions: what scale of land area is appropriate to each of these types of information. Dave's maps in Nebraska: scale varies with the numbers of weeds per unit area: the lower the numbers the larger the scale of sampling needed. Our foxtail spp. seed bank prediction of emergence: what scale is appropriate for seed banks? Jack Dekker _____________________________ Jack Dekker ;-) 3218 Agronomy Hall Iowa State University Ames, Iowa 50011 TEL: 515.294.8229 FAX: 515.294.3163