Instructions about the use of this key are interspersed throughout the document. These instructions are always printed on your screen in italics. During the use this key you will be asked to make a series of selections. Each selection will narrow the possible causes of an abnormality until you reach a list of one to several possible causes. It is nearly impossible to distinguish among the causes of these final lists without additional information, particularly laboratory tests. Check with your local extension office for infromation about an appropriate laboratory. For most of the production problems a short explanation is available that gives a description of symtomolgy and other information. To view this information click on: This infomation may contain one or more pictures. If picture(s) are available, the production problem will be followed by: An understanding of terms used in diagnosing soybean abnormalities is essential to use of this key. Most key terms are defined in the dictionary of terms. To read the definition, click on "View Dictionary" and find the term for which you wish to review the definition. You will need to use the back icon on you browser to return to the key. In each list of possible selections (except the first), you will find "Return to beginning of key" and "Return to prior step". Use these selections if you decide you have made a wrong selection. To begin the key please click here: Enter Key Key to Help Determine Cause of Soybean Production Problem Select the best description of soybean stage of development I. Pre-emergence (after planting but before VE) II. Seedling (VE to V4) III. Vegetative (V5 to R1) IV. Reproductive (R1 through harvest) View Dictionary