Changes of Earth Temperature in Third Accumulated Temperature Zone and Determination of Maize Sowing Time in Heilongjiang Province
ZU Hongyue
ZHOU Xuan
LI Xin
DI Hong
ZHANG Lin
ZHENG Hong
WANG Zhenhua
Abstract：The third accumulated temperature zone was an important early-matured maize region in Heilongjiang province. In order to ensure the maize sowing quality,we need to know the changes of earth temperature in this area and to determine the suitable sowing date from April to May. This study analyzed the changes of earth temperature of 5—10 cm soil layer of four representative cities and counties in third accumulated temperature zone in Heilongjiang province from April to May during 2004 to 2013. The sowing time in this area was defined considering maize seed germination temperature. The results showed that daily average earth temperature increased in the fluctuations over time. It increased steadily from 1st to 8 th in April,a great fluctuation from 9 th to 20 th in April,and it showed a general upward trend from April 25th to May 1st. The earth temperature steadily reached 6 ℃,7 ℃,8 ℃,9 ℃ and 10 ℃ on 17th,17th, 18th,18th and 26th in April respectively,but the date varied largely in different years. We suggested that the earliest maize sowing time was April 20 th,the suitable sowing date was from April 27 th to May 10 th.
Keywords：Heilongjiang provincethird accumulated temperature zonemaizeearth temperatureso-wing date
Publication Date：2016-04-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：4( 23-26 )