AN EVALUATION OF THE FERTILIZING VALUE OF ACTIVATED WASTE SLUDGE. PART III. THE INFLUENCE OF THE KINDS AND OF THE SEASONS OF THE APPLICATION OF SLUDGE AS WELL AS THE NPK FERTILIZATION ON THE CONTENT OF SOME MACROELEMENTS IN TESTED CROPS AND THE VALUE

摘要

In a field experiment, the influence of the kinds and of the seasons of the application of sludge, as well as of the mineral fertilization, on the content of nitrogen, phosphorus and potassium in potato tubers as well as on the grain and straw of oatsand winter rye was investigated Tne influence of the parameters investigated on the values of the utilization coefficient of nitrogen phosphorus and potassium from organic fertilizers was also determined. The influence of all the parameters investigatedon the content of the macroelements determined in the crops tested was stated. The parameters investigated also differentiated the values of the utilization coefficient of nitrogen, phosphorus and potassium from farmyard manure and waste activated sludge.