Suitable nitrogen release speed type and mixing ratio of coated urea for single basal fertilization of the rice cultivar 'Genkitsukushi'
2016
Araki, M. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan))
In order to establish a labor-saving single basal fertilization method for the rice cultivar 'Genkitsukushi', we examined the effect of different release speed types and mixing ratios of coated urea as basal fertilizer on grain yield and quality. When the mixing ratio of slow-release nitrogen to total nitrogen applied was 60%, the number of spikelets per square meter increased and the yield was superior compared to when the mixing ratio was 50%. Furthermore, when a combination of sigmoid 100-day-type and sigmoid 120-day-type coated urea was administered, the protein content of brown rice was higher than when only sigmoid 100-day-type coated urea was administered. It is suggested that using sigmoid 100-day-type coated urea at a mixing ratio of 60% has a suitable effect on the grain yield and quality of 'Genkitsukushi' rice.
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