Studies on the regional characteristics of yield stability of main crops in Kyushu district. : [I] Regional variation of yield stability of paddy rice crop.

[摘要] This paper deals with results of investigations on the regional variation of yield stability of the paddy rice crop in Kyushu district. Remarkable variations among different regions can be recognized as shown in Fig. 1. Region number and yield stability (%) are as follows : The most stable region (1), 5.8 %. Stable regions (2)∼(4), 7.1∼-7.8 %. Unstable regions. (5)∼(10), 9.3∼11.9 %. The most unstable regions (11)∼(12), 13.8∼15.9 %. The most stable regions can be found in the plains of the coastal area of Ariake-kai where farm managements are of intensified form and the most unstable regions are dispersed in the islands and the mountainous parts where managements are unintensified.

[学科分类] 农业科学（综合）