Lime investigations on four Canterbury soil types : The correlation of laboratory determined lime requirements with field responses and the relation of differential reactions obtained to the buffer capacity of the soils as expressed by their organic and inorganic colloidal content : Thesis presented for M. Agr. Sc. [Master of Agricultural Science] and Honours

Abstract

It is the aim of this investigation to determine the lime requirement of samples from four Canterbury soil types, using the method mentioned above as modified by G. Mitchell (and to correlate the results obtained, with field responses, as indicated by pH changes, induced by dressings of known quantities of commercial ground limestone.* The results thus obtained should provide a basis from which it will be possible to give definite recommendations as regards liming practices on the four soil types selected, and to predict the changes in acidity which will take place as a result of applying different quantities of limestone. Differential responses given by the various soil types, and in some cases by soils on a single type, are noted, and the principles underlying them evolved and explained as far as possible in the time available.