三江平原水稻适宜插秧期的理论解析

本田的最低水温、平均水温分别与最低气温、平均气温成正相关 ,而且水层具有增温保温作用 ,在晚霜之前插秧遇低温靠水层保护是完全可行的。5月 12日作为插秧早限是可行的 ,但最适插秧期应选择在 5月 18日前后 ,根据当年的气温特点来具体决定 ,5月 17、 18日前后气温回升迅速即可插秧 ,低温年则推迟到 2 0日后比较适宜。在适宜插秧期内应尽快插完、越早越好 ,这对于水稻成熟非常重要

The theoretical analysis on proper rice transplanting period in san-jiang plain

In paddy field,water's lowest temperature and average temperature were positive related with the air's lowest temperature and average temperature,water's layer had the advantage of increasing temperature and keep temperature.It was feasible to keep temperature by water layer when meeting low temperature before late frost. May 12 th was feasible as the early time for rice transplant,but the most proper time was May 18 th or so according to the air temperature of the year.We can transplant rice from May 17 th to 18 th when air tenperature was high.In low temperature year,rice should be transplanted after May 20 th .Finished rice transplanting in the proper period as possible was very important for the maturity of rice.$$$$