辽宁省稻田土壤供钾状况研究

Study on the Status of K-supply of Paddy Soil in Liaoning Province

据测定,辽宁省水稻土速效钾、缓效钾的平均含量均以盘锦、营口地区的盐渍型水稻土为最高,其次是东港地区盐渍型、淹育型和潜育型水稻土以及铁岭地区淹育型水稻土,最低的是沈阳地区淹育型水稻土。各地区水稻土的供钾强度(Ⅰ)、供钾容量(Q)以及供钾缓冲力(Q/I),均按上述地区顺序依次递减。出现这些差异,是由于土壤成土母质、粘土矿物类型、钾肥用量、灌溉水水质以及土壤基本性质,诸如粘粒含量、阳离子交换量、pH值等因素不同而造成的。盘锦、营口稻区水稻土在这几方面都占优势。

The mean contents of readily available potassium and slowly available potassium in the paddy soils (stagnic Anthrosols) of Liaoning porvince were in the order:salinized paddy soil of Pangjing and Yingkou district>salinized paddy soil,submergic paddy soil and gleyed paddy soil of Donggan district>submergic paddy soils of Tieling district>submergic paddy soils of Shenyang district.The K-supply intensity,the K-supply quantity and the K-buffer capacity were in line with the order of the mean contents of K.The K status of the paddy soil in Liaoning province vared in different districts.It is mainly due to the differences in soil-forming parent material,types of clay minerals,K fertilizer application,quality of irrigation water and soil properties.