Abstract The effect of periodate followed by sodium borate treatment on the stabilities of prewet soil aggregates has been determined by a permeability technique and by wetsieving. The effect of periodate treatment depends on the history of the site, the depth, and the great soil group from which the sample is taken. The stabilities of aggregates from various Red Brown Earths were all reduced by periodate treatment. The reduction was small for samples from plots which had been under pasture for many years, but very large for samples which had been under pasture for 4 years or less, or which were continuously cropped. The stabilities of all subsurface samples of the Red Brown Earths were completely destroyed by periodate treatment. Aggregates taken from a Solonized Brown soil were much less sensitive to periodate treatment, and those taken from a Rendzina were with one exception unaffected. These soils contain free CaCO 3 . It is probable that the most important function of the periodate treatment is to cause breakdown of the polysaccharides and polyuronides in the soil, and the results show that in cropped soils and soils under young pastures aggregate stability is primarily due to these materials. In soils under older pastures, or soils which contain free CaCO 3 , other materials prevent aggregate breakdown.
Forested ecosystems have been identified as potential C sinks. However, the accuracy of measurement and understanding of the underlying mechanisms for soil organic C (SOC) stora...
The Permanent Rotation Trial at the Waite Agricultural Research Institute in South Australia was established on a red-brown earth in 1925, with predominately cereal-long fallow ...
Up to one third of the membrane proteins from bovine, ovine and human red cells were solubilized similarily by water pH 9.5, aqueous pyridine, ATP‐mercaptoethanol solutions or u...
Abstract. Manurial treatments and cropping history have remained unchanged for many years in classical and long‐term experiments at Rothamsted and Woburn, in some cases for more...
The effect of 2 tillage practices (zero v. conventional), fertiliser application (nitrogen, phosphorus and zinc), and pulse–cereal rotation on changes in soil mineral nitrogen, ...
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