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上海郊区地势平坦,土壤肥沃,是我国高产稳产的地区之一。1979年,我们结合土壤分类研究,对土壤的基本性质进行了较系统的分析测定。现将主要土属的有关资料简述如下,为合理利用和改良土壤提供参考。 (一)青紫泥潜育型水稻土,分布在松、青、金的静水洼地,土壤已摆脱沼泽状态,通气状况比沼育型水稻土好,剖面开始分异,出现斑纹层。但由于受轻度潜育化影响,土体仍带灰色,土壤母质以湖相沉积物为主,土体一般没有石灰反应。 1.形态特征:层段发育较沼育型水稻土为好,表现为犁底层发育,出现斑纹层,有
Shanghai suburbs flat, fertile soil, is one of the areas of high and stable yield in our country. In 1979, we conducted a systematic analysis of the basic properties of soils in combination with soil classification studies. The main soil of the relevant information is summarized below, to provide a reasonable reference for the use and improvement of soil. (1) Purple silt glimmering paddy soil, distributed in the quiet, green and gold hydrostatic depressions, the soil has been removed from the swamp, aeration than biogas-type paddy soil is good, the profile began to differentiate, the presence of stripes layer. However, due to the influence of slight gleaming, the soil is still gray, and the parent material of the soil is mainly lacustrine sediments. There is generally no lime reaction in the soil. 1. Morphological characteristics: The development of layers is better than that of biotrophic paddy soils, which is characterized by the development of plow bottom layer,