Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Date (from‐to) : 2011/04 -2015/03
Author : KIMIURA Sonoko Dorothea; MOTOBAYASHI Takashi; SUZUKI Sozoh; ARAI Sachiho; OHTSU Naoko; NAKAI Madoka; MURASE Kaori; SATO Kannna
The instability of organic agricultural practices was analyzed from aspects from agronomy, plant physiology, plant protection and agro-economy for rice and tea as model crops. Based on on-farm researches in Kyushu and Kanto region, field experiments were conducted at Tokyo University of Agriculture and Technology and Saitama Prefectural Agriculture and Forestry Research Center. Tea cultivation technology was not standardized and highly depending on the producers’ skill. Population of red spider mite, tea spiny whitefly and yellow tea thrips increased significantly in chemical fertilizer treatment compared, while tea nitrogen concentration did not differ among the treatments. For environmentally friendly agriculture, utilization of organic fertilizer that takes into account environmental and anthropogenic factors is necessary.