Year: 1961
Type: article
Abstract: The experiment on the effects of green manure application on the yield and growth of Satsuma orange trees has been conducted since 1946 at Ehime Fruit Tree Experiment Station, Five experi-mental plots have been set up in the terraced orchard on diluvial soil. The total amount of each element (nitrogen, phosphorous and potassium) applied was same in all plots. In the “100% green manure” plot, green manure alone was applied every year, lupin or broad bean being applied in April and soybean in September. The “0% green manure” plot was applied with chemical fertilizers alone with no green manure. In the 75, 50 and 25% green manure plots, the amounts of green manure applied were the designated percents as much as that applied to the “100% green manure” plot, and the rests were supplemented with the chemical fertilizers. The Satsuma orange trees on trifoliate orange were 25 years old in 1946 when the experiment was started. Each plot was con-sisted of six trees. 1. The yield in the 0% green manure plot was larger than that in the 100% green manure plot for the first three years (1946 to 48), nearly equal to the latter for the following three years (1949 to 51), and then exceeded by the latter since 1952. The 25%, 50%, and 75% plots situated between the 0% and 100% plots in their yields. Since 1953, the yield of 25% plot approached to that of the 0% plot, and the 75% plot to 100% plots. The trees. in the 0% plot have gradually lost their vigor, and since 1957 they have been so exhausted that they could hardly be used in the experiment. The yield of the 50% plot has been intermediate between those of the 100% and 0% plots. 2. Measurements of size and shape of fruits for 7 years, 1950 to 56, showed that the more the green manure was applied, the larger the fruit size and the flatter the fruit shape. Fruit growth during July to November was better in the 100% plot than. in the 0% plot. 3. The experiments on fruit storage conducted in 1948 to 53 revealed that the percentage of storage loss due to molds was less in the plots receiving larger amounts of green manure. 4. Tree volume and trunk circumference in 1960 were larger in the plots receiving larger amount of green manure, showing the same tendency as, the results on the yields for 1956 to 59.
DOI: 10.2503/jjshs.30.215
Authors: T. SAKAMOTO, S. OKUCHI, T. YAMAMOTO, K. YAKUSHIJI
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2050169364