红壤丘岗区潜育性稻田硫硅硼铜元素的有效性

Studies on nutrients availability of S, Si, B and Cu in gleyed paddy soilsderived from red earth

研究结果表明,红壤丘岗区潜育性稻田中的冷浸田和烂泥田土壤有效硫含量相对较低,这两种类型潜育田存在潜在性缺硫问题,故应注意硫肥的施用。潜育性稻田土壤有效硅亦普遍低于非潜育性田,因而极有可能发生缺硅。与同母质类型的非潜育性稻田比较,红壤潜育性稻田土壤有效硼含量并无明显差异。但第四纪红土发育的潜育田土壤有效硼低于缺硼临界值。部分潜育田士壤有效铜含量亦低于渍水土壤缺铜临界值,这说明部分渍潜田存在缺铜现象。

In this paper, the availability of S, Si, B and Cu nutrients in different types of gleyed paddy soils derived from red earth was studied. It was found that cool gleyed paddy soils and pappy gleyed paddy soils had lower contents of available S, which were potentially deficient in S supplying. It was also found that the contents of available Si in gleyed paddy soils was markedly lower than those in normal paddy soils, which indicated a possible Si deficiency in gleyed paddy soils. Compared with normal paddy soils derived from the same parent material, there was no significant difference in contents of available B between gleyed paddy soils and normal paddy soils, otherwise, the contents of available B in the gleyed paddy soils derived from Quaternary clay were under the critical content of B deficiency. It was showed that the contents of available Cu in some gleyed paddy soils were lower than the critical value of Cu deficiency for flooded soils, which illustrated some gleyed paddy soils were deficient in Cu supplying.