Influence of Cultivation and Weed Killers on Soil Structure and Crop Yield

A Portable Soil Core Sampler and Penetrometer1

“…Typical results obtained in the taking of soil cores for bulk density determinations are given in Table 2. These samples were taken in experimental plots set up for the study of the effect of weed control and tillage on soil physical properties (7). Although the samples were not all taken at the same time, it is believed they give a good comparison of the variability to be expected from the three kinds of sampling apparatus used.…”

“…After using the Lutz type sa1npler extensively in sampling some tillage and weed control plots (7) at the Mount Carmel Farm of the Station, it became obvious that it was not possible to hold the sampler up-. right in a rigid position when force (by hammering•) was being applied.…”

“…• 7 The drums (h, Fig. 1) have been removed from the apparatus smce the photographs were taken in order to obtain greater leverage.…”

Non-Cultivation Systems for Small Fruits and Vegetables

“…However, their trials were carried out in years of heavy early season rainfall followed by unusually hot clry weather. Further, although the surface crust that developed reduced the yield of corn, carrot growth was not visibly affected (49).…”