Comparison of the Constancy of Three Kinds of Heat Unit Accumulation Required for Silking of Feed Corn Sown at Different Days in Northern Kyushu

Japanese Journal of Crop Science

Mitsuyoshi UEDA¹ 

关键词: Corn;    絹糸抽出期;    Day length;    積算温度;    Heat unit accumulation;    トウモロコシ;    Silking stage;    日長;   

DOI  :  10.1626/jcs.71.226

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Constancy of three kinds of heat unit accumulation required for silking of corn cultivated in Northern Kyushu was compared using the data of 14-24 experiments with different sowing dates. The cultivars used were early variety G4321A, medium variety G4810A, late variety P3160 and Ko-3 bred in Japan. The kinds of heat unit accumulation used were: simple heat unit accumulation (SHUA), which is the accumulation of daily mean temperatures above 0°C, effective heat unit accumulation-I (EHUA-I), which is the accumulation of daily mean temperatures above 10°C, and effective heat unit accumulation-II (EHUA-II), which is the accumulation of daily mean temperatures above value a(°C) in the formula, Y=aX+b, where X and Y are the number of days and SHUA from sowing to silking, rspectively. The coefficient of variation (C.V.) was as large as 7.9-10.9% and that of EHUA-I was 5.1-9.3%. On the other hand, C.V. of EHUA-II was only 2.5, 3.2 and 5.2% in G4321A, G4810A and P3160, respectively, showing a high constncy. In Ko-3, C.V. of EHUA-II was 8.5%, probably because this cultivar is sensitive to photoperiod.

【 授权许可】

Unknown