ZESZYT Nr 2 / 2010 Abstrakty Volume No 2/2010 Abstracts |
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| 4.Cost evaluation of the
application of the differentiated nitrogen doses on winter wheat field - Zuzanna Jarosz, Janusz Igras, Rafał Pudełko, Krzysztof Kubsik Abstract. The materials derived from the studies of the spatial within-field variability were used in this research. The experiment was carried out in the Experimental Station Baborówko (wielkopolskie voivodship) belonging to the Institute of Soil Science and Plant Cultivation – National Research Institute (IUNG-PIB), in Puławy. The map of the variation of the nitrogen doses is based on detailed analysis of the spatial variability of field and the vegetation indices. Three types of nitrogen fertilization were used to assess the economic effect of the systems – an intensive – heavy fertilization system (according to which, the dose of 100 kg N ha-1 was applied on the whole fi eld), a highly intensive – very heavy fertilization system (where 160 kg N ha-1 was applied), and a varied system, where a varied (within the field) dose of N was implemented and was defi ned on the basis of the maps of the potential productivity of the fields. The analysis showed that the unit cost of the nitrogen fertilizer per hectare was 233 PLN in the heavy fertilization system, 373 PLN very heavy fertilization system and 311 PLN in the system with the differentiated doses of N. The use of the varied nitrogen rates within the same fi eld, allowed the costs to be reduced by about 16.7% compared to the scenario of a highly intensive use of nitrogen fertilizers. However, compared to the intensive scenario, these costs were 33.3% higher. key words: economic assessment, map of the differentiated nitrogen rates, intense (heavy) fertilization system |