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001-es BibID:	BIBFORM002705
Első szerző:	Lazányi János (mezőgazdász)
Cím:	Distribution of 0.01 M CaC12 extractable nitrogen forms in Westsik's crop rotation experiment / Lazányi János
Dátum:	2007
Megjegyzések:	The study aimed the optimization of the fertilizer recommendation system by considering the soil N-organic content as a measurement of site-specific mineralization potential as the 0.01 M CaCl2 extraction method measures soluble organic N compounds that are related to the mineralization of organic nitrogen in the soil. The amount of nitrate (NO3--N), ammonium (NH4+-N) and N-organic were measured in 9 different part of the parcel to estimate within plot variation in the treatments of Westsik's crop rotation experiment. The introduction of this method can possibly result in a more environment-friendly nitrogen fertilization, without negative effects on the yield or the quality of cultivated plants. Taking practicability and costs into consideration, the 0.01 M CaCl2 extraction method is suitable for the routine analysis of measuring easily available organic nitrogen. The upper layer of sandy soil in Westsik's crop rotation experiment contains 3000 kg/ha nitrogen, but most of it is in organic matter, and in the body of living soil micro-organisms. 0.01 M CaCl2 soluble N represents only about 1% of total N in the soil, and cycles rapidly. It is permanently supplied by the mineralization of SOM and occasionally by fertilisers and atmospheric deposition. Plant uptake, denitrification leaching and immobilisation by micro-organisms deplete it. The study aimed to optimize the nitrogen fertilizer recommendations for the Nyírség region and a better knowledge of 0.01 M CaCl2 extractable nitrogen forms may help improve the efficient use of fertilizers and organic manure.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok előadáskivonat 0.01 M CaCl2 extractable nitrogen forms Westsik's crop rotation experiment
Megjelenés:	Rational methods for the selection and use of agrochemical measures : risk modeling, monitoring and management : First International Conference METAGRO 2007 : 14-16 June 2007, Cluj-Napoca : Proceedings / ed. Mihai Cornel Rusu. - p. 159-167. -
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