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洞庭湖平原由长江入湖淤泥及四水尾闾三角州交互联接而成。平原的西部和北部,主要是长江沉积物发育的紫潮泥,呈石灰反应。平原的南部,主要是湘江和资江沉积物发育的潮沙泥,酸性和微酸性。环湖是第四纪红色粘土发育的红黄泥,一般呈酸性。为了探讨这一地区稻田土壤的供钾能力,本试验从各类母质发育的水稻土取样,进行矿物鉴定和释钾速率的化学测定。测定方法:全钾用碱熔法,缓效钾用1N硝酸煮沸10分钟提取,速效钾用1N醋酸馈(PH=7)提取,全部制备液的钾用火焰光度法测定。
Dongting Lake plain by the Yangtze River into the lake silt and the Sishuiwei delta state interconnected. The west and north of the plains, mainly the purple tidal mud developed in sediments of the Yangtze River, are lime-colored. The southern part of the plains is dominated by tidal sands, acidic and slightly acidic, which develop in the sediments of the Xiang River and Zijiang. Lake is the Quaternary red clay development of red and yellow mud, generally acidic. In order to investigate the potassium supply capacity of paddy soils in this region, paddy soils of all kinds of parent materials were sampled for mineralization and chemical determination of potassium releasing rate. Determination methods: total potassium alkali melting, slow potassium with 1N nitric acid boiled for 10 minutes to extract potassium available 1N acetic acid fed (PH = 7) extraction, the entire preparation of potassium was determined by flame photometry.