Variation of Safe FullHeading Period for DoubleCropping Late Rice in Recent 40 Years in Wenzhou
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Abstract:
An analysis is made of the dates of last days for daily mean temperature being stably greater than 22 ℃ in use of the data from various stations of Wenzhou, and the variation characteristics and trends are obtained. To judge the objectivity of the variation, a significance test is conducted with SPSS (Statistical Product and Service Solutions). The results show that the dates of the last days for daily mean temperature being stably greater than 22 ℃ at some stations varied obviously after the 1990s. Under the condition of 80% assurance rate, the dates of the last days before and after 1990 are studied. The safe fullheading periods are determined, and the sowing dates are derived. The suggestions of sowing dates for doublecropping late rice are presented, which can be used as references for the better utilization of agricultural climatic resources.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.