. Biology of deserts : the proceedings of a symposium on the biology of hot and cold deserts organized by the Institute of Biology. Deserts. Archaean rocks. Pedogenetic considerations, therefore, indicate a lower fertility level for the north- west soils and this has been confirmed by practical observation of herbage responses following rains and the stock fattening capacity of the two districts. As part of the present study, the productivities of a range of semi- arid and arid soils were compared in a series of pot culture tests with that of a moderately fertile red-brown earth soil from the
. Biology of deserts : the proceedings of a symposium on the biology of hot and cold deserts organized by the Institute of Biology. Deserts. Archaean rocks. Pedogenetic considerations, therefore, indicate a lower fertility level for the north- west soils and this has been confirmed by practical observation of herbage responses following rains and the stock fattening capacity of the two districts. As part of the present study, the productivities of a range of semi- arid and arid soils were compared in a series of pot culture tests with that of a moderately fertile red-brown earth soil from the Waite institute and representative of the better agricul- tural areas of the State. (Table 5- Fig. .7) The results indicate the low fertility of the arid soils and particularly of those from the North- west District. Marked responses were obtained to soluble nitrogen on all the arid soils although there was little response to phosphorus; even with the heavy application of nitrogen and phosphorus, however, the productivities of these soils were considerably below that of the red-brown earth, indicating the possibility of a further limiting factor or factors in the former soils. One indication of the limitation of productivity imposed by deficient nutrient supply is given by the wide differences in the transpiration ratio for Atriplex vesi- caria in pot culture tests (series A) conducted on the respective soils: on red - brown earth soil a transpiration ratio of 370 indicated a production of cwt. dry forage per. Figure 7. Growth of barley without fertilizer on various soils (left to right). Red- brown earth, U'aite Institute; solonized brown soil, Pallamana; arid red earth, District; arid red earth, '. District. 141. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cloudsley-Thompson, J. L. London :
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectdeserts
