In this study, the average daily temperatures from September to November in Nantong City were analyzed. According to the critical temperature indices for japonica rice, obtained rice safe dates of full heading and maturity and the guarantee rate for the safe dates was 50%, 80%, and 90%, respectively. It was observed that the safe dates of full heading during the third 20 years were eight to nine days later than those during the first and second 20 years, and the safe dates of maturity were five to ten days later, respectively. It was observed that as the globe warmed, the critical temperature indices of full heading （20℃） would not develop the function of guiding production, and proposed the reference index, the summation of effective temperature from full heading to maturity, to predict the dates through the security maturity forward daily cumulative effective temperature （≥10℃）. The corrected safe dates for full heading of 80% were September 6, 25 days earlier than initial predicted dates.
LI Shi-Feng-1, XU Yun-2, LIU Rong-Rong-3
. Temporal Change Characteristics of Safe Dates for Full Heading and Maturity in Japonica Rice[J]. China Rice, 2014
, 20(6)
: 10
-13
.
DOI: 10.3969/j.issn.1006-8082.2014.06.003
[1] 李世峰，刘蓉蓉，杨洪建，等. 南通市稻作方式现状与发展趋势[J]. 河北农业科学，2011，15（11）：24-27，53.
[2] 任国玉，郭军，徐铭志，等. 近50年中国地面气候变化基本特征[J]. 气象学报，2005，63（6）：942-956.
[3] 高亮之，郭鹏，张立中，等. 我国水稻的光温资源与生产力[J]. 中国农业科学，1984，17（1）：17-23.
[4] 高亮之，李林，郭鹏. 中国水稻生长季与稻作制度的气候生态研究[J]. 农业气象，1983（1）：50-55.
[5] 余松烈. 作物栽培学[M]. 北京：中国农业出版社，2003.
[6] 徐晶晶， 黎泉，李刚华，等. 江苏水稻安全成熟期的时空演变研究[J]. 南京农业大学学报，2013，36（4）：1-6.
[7] 宋水华，宋良娈. 界限温度初终日期的确定及意义[J]. 沙漠与绿洲气象，2009，3（8）：113-114.
[8] 欧阳海，郑布钟，王雪娥，等. 农业气候学[M]. 北京：气象出版社，1990：77-78.
[9] 凌启鸿，张洪程，苏祖芳，等. 稻作新理论—水稻叶龄模式[M]. 北京：科学出版社，1994：247.
[10] 薛大伟，方茂庭，钱前. 有效积温在水稻生产中的应用[J]. 中国稻米，2004（4）：47-48.
[11] 莫惠栋. 种稻原理与技术[M]. 南京：江苏科学技术出版社，1981：142-145.
[12] 王夫玉，张洪程，赵新华，等. 温光对水稻籽粒充实度的影响[J]. 中国农业科学，2001，34（4）：396-402.
