2026 Volume 95 Issue 1 Pages 104-116
To determine the effect of trace elements on kidney bean yield, fertilizer application containing boron and zinc (Experiment 1) was conducted at two sites, Ebetsu, a fine-grained Haplic Pseudogley soil, and Obihiro, a light Allophanic Andosols. Soluble zinc was below the lower limit of the soil diagnostic standard at both sites. The average yield increase for the FTE (fugitive boron), Agri-Ace (fugitive boron and zinc), and water soluble (water soluble boron and zinc) treatments was 12, 9, and 14%, respectively, The absence of differences in seed yield with and without zinc in the materials only for boron suggested that the seed yield increase was due to the increased absorption of boron. Five levels of boron application were
tested in Ebetsu and Obihiro (Experiment 2), including no-treatment. Seed yield peaked at 720 g/10 a of boron, and decreased at levels higher than 1080 g/10 a. In both test sites, seed yield increased at 720 g/10 a of boron and decreased at levels higher than 1080 g/10 a of boron. In Ebetsu and Obihiro, the boron content after harvest exceeded the upper limit of 1.3 ppm for soil diagnosis in the 1080 g/10 a and 1440 g/10 a treatments, respectively. The application of boron at 360 to 720 g/10 a was effective for increasing seed yield, through two experiments. and this amount of boron was not enough to accumulate enough to cause excessive damage.
