Concentration of certain constituents of the soil solution under orchard conditions
AuthorE. L. Proebsting
Author AffiliationsE. L. Proebsting was Assistant Professor of Pomology and Assistant Pomologist in the Experiment Station.
Hilgardia 5(3):35-59. DOI:10.3733/hilg.v05n03p035. July 1930.
Abstract does not appear. First page follows.
The problem of the maintenance of orchard soil fertility has received a great deal of attention. The principal methods employed have been the addition of fertilizers and the growing of covercrops. The latter method was chosen for the experiment being conducted by the Division of Pomology of the California Agricultural Experiment Station, at Davis. In anticipation of differences in the behavior of the trees under the different treatments, various determinations have been made on the soils in the several plots. The crop history, the arrangement of plots, and a preliminary report on changes in the soil solution have been described in an earlier paper.(9) The plots are as follows: three clean cultivated checks, growing a sparse weed covercrop in winter; alfalfa sod; mat bean, which is a summer covercrop planted in May; Melilotus indica, and rye and vetch, which are two winter covercrops planted in September and turned under in March. The arrangement of plots is shown for block A, in figure 1. Block B duplicates block A except that Satsuma is used in place of Santa Rosa, and is one year younger. These treatments run across the eight species (now reduced to seven) used in planting. All plots are in duplicate. Pears, prunes, apples, Japanese plums, cherries, apricots, peaches, and almonds were planted; but the last named were removed in 1928 and replaced by pears. The alfalfa was plowed in the fall of 1929 because it was becoming foul with fox-tail and thistle.
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