英国研究人员最近设计出了一种新型的水分测定仪,可以测出植物生长过程中各时期所需要的水分。这种仪器与过去常用的直接测定植物体内水状况的仪器不同,它是通过测定植株周围土壤中的电阻来表示植物体内的水分状况。当植物体内水分适量时,仪器的显示屏上会出现一张“笑脸”;反 British researchers recently designed a new moisture analyzer that measures the amount of moisture needed during various stages of plant growth. This instrument is different from the instruments used to directly measure the water condition in plants in the past. It measures the water in plants by measuring the resistance in the soil around the plants. When the plant body moisture, the instrument’s screen will appear a “smiley face”;