Plantation black walnut can become stagnated because of excessive weed competition. A 7-
to 11-year-old black walnut plantation was treated with simazine, Roundup, and a …

Although agricultural productivity has been greatly increased over the past several decades,
there has been little concomitant increase in our ability to produce greater yields per-acre of …

METHODS The 25 Populus clones used in this study were chosen from those gathered by
the Maximum Yield Project of the North Central Forest Experiment Station for possible use in …

From condition classification of more than 39,000 street trees in Iowa, an analysis is presented
of which species seem to be best adapted for street-tree types of environments. Species …

Three Populus hybrids (Tristis No. 1, Crandon, and Wisconsin No. 5) were grown for 5 weeks
under 12- or 18- photoperiods in growth chambers. At four times during growth, dry weight …

For years, many forest managers in Iowa have used seedlings to establish walnut and oak
stands, with a planting rate of 500 to 1,000 trees per acre and three to five years of follow-up …

This key is designed to help identify the most common trees found in Iowa. It is based on
vegetative characteristics such as leaves, fruits, and bark and is illustrated with black and white …