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对感温性作物的有效积温进行研究,将会指导引种和栽培,有利于确定安全播种期,并根据发育阶段,制定栽培措施,加强科学的预见性,避免盲目性。美国已确定了一种计算感温性作物积温的“DD50/25”发育预测法。美国国家气象局在作物生长期每星期播送3次“DD50/25”的情报,以指导农户确定田间管理计划。1984年我们对从美国引进的水稻新品种“Lemont”和“Bellemont”的“DD50/25”值在美国及在广州的情况进行了初步的比较。虽然两地生态条件相差很大,但“DD50/25”总值以抽穗期作比较,只相差1—4天,看来此预测法有一定的普遍意义。
Research on effective accumulated temperature of temperature-sensitive crops will guide the introduction and cultivation, help to determine the safe planting period, and develop cultivation measures according to the developmental stages to enhance the scientific predictability and avoid blindness. The United States has established a “DD50 / 25” developmental prediction method for calculating the accumulated temperature of temperature sensitive crops. The National Weather Service broadcasts “DD50 / 25” information three times a week during crop growth to guide farmers in determining field management plans. In 1984 we made a preliminary comparison of the “DD50 / 25” values of the new rice varieties “Lemont” and “Bellemont” introduced from the United States in the United States and in Guangzhou. Although the ecological conditions vary greatly between the two places, the total value of “DD50 / 25” compared with the heading date only differs by 1-4 days. It seems that this forecasting method has certain universal significance.