过去测量农田、玻璃温室内的气温,多用水银温度计、洒精温度计等仪器。这些差不多都是目测仪器,需要观测者直接进入农田,观测起来很困难,也容易破坏田间作物群体的自然状况,使获得的资料缺乏代表性,而且还受人体的影响,造成测量数据的误差。曾改用热电偶温度计、金属丝温度计 Past measurement of farmland, glasshouse temperature, multi-purpose mercury thermometer, sprinkle fine thermometer and other equipment. These are mostly visual instruments that require observers to enter the farmland directly and find it difficult to observe. They also tend to undermine the natural state of crop groups in the field, making the acquired information less representative and subject to human influences, resulting in errors in measured data. Have switched to thermocouple thermometer, wire thermometer