gypsum (calcium sulfate), single superphosphate (SSP), or
triple superphosphate (TSP) by broadcasting after potatoes are
planted. An experiment was conducted involving (1) control
treatment following the standard fertilizer rate for potatoes
from the Hokkaido Fertilizer Recommendations 2015
(60 kg N ha
−1
, 200 kg P 2 O 5 ha
−1
, 110 kg K 2 O ha
−1
) by
applying ammonium sulfate, ammonium phosphate. and
potassium sulfate in the basal soil; (2) gypsum fertilizer
treatment by applying the same fertilizer as the control and an
additional broadcasted gypsum after planning at 500 kg ha
−1
;
and (3) SSP treatment by applying fertilizer at the standard rate
but replacing ammonium phosphate with SSP. In the gypsum
and SSP treatments, both tuber starch content and tuber yield
increased by more than 10%. In the SSP treatment, the incidence of black bruise decreased (Fig. 5.23).
References
Agriculture and Horticulture Development Board (AHDB) (2017)
Nutrient management guide (RB209) Section2 p. 17. https://ahdb.
org.uk/documents/RB209/RB209_Section2_WEB_2017-12-01.pdf
(March, 2018)
Aguilos M, Takagi K et al (2013) Sustained large stimulation of soil
heterotrophic respiration rate and its temperature sensitivity by soil
warming in a cool-temperate forested peatland. Tellus B 65:20792.
https://doi.org/10.3402/tellusb.v65i0.20792
Fig. 5.22 Histogram of surface soil calcium saturation in potato
growing farms of Tokachi and Kamikawa districts. Surface soil samples
were collected in potato growing farms in Tokachi (n = 90) and
Kamikawa (n = 80) district in 2013 and 2014 growing seasons.
Calcium saturation was determined by cation exchange capacity by the
Schollenberger method and the analyzed exchangeable calcium
content. Figure supplied by Rintaro Kinoshita, Jiwan Palta and
Masayuki Tani
Fig. 5.23 Effects of broadcasted gypsum and single superphosphate
on tuber yield of potatoes and the incidence of black bruise. Data
extracted from an experimental result from 2015 growing season
(Cultivar: Toyoshiro, location: Memuro town, soil type: Low-humic
Andosols, Typic Hapludands). Values indicated in the figure show
relative values to control set at 100. Figure supplied by Rintaro
Kinoshita, Jiwan Palta and Masayuki Tani
5 Hokkaido Region
181
triple superphosphate (TSP) by broadcasting after potatoes are
planted. An experiment was conducted involving (1) control
treatment following the standard fertilizer rate for potatoes
from the Hokkaido Fertilizer Recommendations 2015
(60 kg N ha
−1
, 200 kg P 2 O 5 ha
−1
, 110 kg K 2 O ha
−1
) by
applying ammonium sulfate, ammonium phosphate. and
potassium sulfate in the basal soil; (2) gypsum fertilizer
treatment by applying the same fertilizer as the control and an
additional broadcasted gypsum after planning at 500 kg ha
−1
;
and (3) SSP treatment by applying fertilizer at the standard rate
but replacing ammonium phosphate with SSP. In the gypsum
and SSP treatments, both tuber starch content and tuber yield
increased by more than 10%. In the SSP treatment, the incidence of black bruise decreased (Fig. 5.23).
References
Agriculture and Horticulture Development Board (AHDB) (2017)
Nutrient management guide (RB209) Section2 p. 17. https://ahdb.
org.uk/documents/RB209/RB209_Section2_WEB_2017-12-01.pdf
(March, 2018)
Aguilos M, Takagi K et al (2013) Sustained large stimulation of soil
heterotrophic respiration rate and its temperature sensitivity by soil
warming in a cool-temperate forested peatland. Tellus B 65:20792.
https://doi.org/10.3402/tellusb.v65i0.20792
Fig. 5.22 Histogram of surface soil calcium saturation in potato
growing farms of Tokachi and Kamikawa districts. Surface soil samples
were collected in potato growing farms in Tokachi (n = 90) and
Kamikawa (n = 80) district in 2013 and 2014 growing seasons.
Calcium saturation was determined by cation exchange capacity by the
Schollenberger method and the analyzed exchangeable calcium
content. Figure supplied by Rintaro Kinoshita, Jiwan Palta and
Masayuki Tani
Fig. 5.23 Effects of broadcasted gypsum and single superphosphate
on tuber yield of potatoes and the incidence of black bruise. Data
extracted from an experimental result from 2015 growing season
(Cultivar: Toyoshiro, location: Memuro town, soil type: Low-humic
Andosols, Typic Hapludands). Values indicated in the figure show
relative values to control set at 100. Figure supplied by Rintaro
Kinoshita, Jiwan Palta and Masayuki Tani
5 Hokkaido Region
181