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答:要知道土壤的团粒结构,先要了解什么叫做土壤的结构?所谓结构即是指土壤中各别的细微的土粒的自然集合和排列情况。如果这种自然集合的单位大体上成混圆形状,直径大小约在1—10毫米左右,遇水不化,则我们就叫它做团粒结构。到田野间去观察土壤时,为了便于辨识团粒结构,可把土壤抓在手里,先观察其外形,大小;再用手指挤压之,以试验其坚韧性,并可从挤碎的粉状土粒中(这些土粒即是各别的细微的单位)分辨出其有机成分(颜色较黑,重量较轻,質地较松较软);最后,可再把未挤碎的土团,倒入盛水的玻璃杯内,观察其是否在水内瓦解开来,如果在水内马上瓦解,那末它的外形和大小,虽符合团粒的规格,但在肥力上仍无多大作用。良好的团粒结构应当是有水稳性的。在田间辨识团粒时,应
A: To know the soil aggregate structure, we must first understand what is called the soil structure? The so-called structure refers to the soil in the individual fine soil particles of the natural collection and arrangement. If this natural collection of units generally into a round shape, the diameter of about 1-10 mm, in case of water, then we call it the crumb structure. To the field to observe the soil, in order to facilitate the identification of aggregate structure, the soil can be grasped in his hand, first observe the shape and size; and then squeeze the fingers to test its tenacity, and from the crushed powder Soil particles (these soil particles are individual subtle units) distinguish their organic components (darker colors, lighter weight, softer texture); and finally, the unground soil can then be poured Into a glass of water, to see if it is in the water to dissolve, if the water immediately collapse, then its shape and size, although meet the specifications of the pellet, but fertility is still not much effect. Good aggregate structure should be water stable. Identify the pellet in the field should be