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001-es BibID:	BIBFORM009130
Első szerző:	Huzsvai László (talajerőgazdálkodási szakmérnök, agrármérnök)
Cím:	Water stress. In which cases does irrigation reduce the yield of maize? / Huzsvai László, Ványiné Széles Adrienn
Dátum:	2009
Megjegyzések:	The impact of irrigation on crop yield is usually described by the yield growth extent. If precipitation supply is average, maize irrigation is ineffective, but it can result in significant yield surplus in drought. Also, there are - rather rare - conditions, in which irrigation causes yield drop. This happened at the latitudinal degree 47 degrees 56' and the longitudinal degree 21 degrees 44' in 2005 and 2006. Many explain the negative impact of irrigation by the lack of air in the soil. We found a different reason for this in our experiment, in which we examined the impact of previous crop, cultivation and fertilisation on maize production. The lack of air in soil cannot be observed in a chernozem soil with good structure. After maize as green croup, yield was lower by 1 t ha-1, whereas was only a 0.34 t ha-1 drop after wheat. The impact of irrigation on maize yield after autumn ploughing was - 900 kg ha-1, whereas it was - 800 kg ha-1 after disk cultivation and - 600 kg ha-1 after spring ploughing. These results cannot be explained by the lack of air, as it would have provided the opposite result. Due to our analyses, the N concentration of the soil solution is determinant. If there is a much N in the soil, water will not dilute the N concentration to a critical extent. Fertiliser treatments supported this hypothesis, as the irrigation-induced yield drop was the highest on non-fertilised plots and the lowest (zero) on plots that with the highest amount of fertiliser.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény hazai lapban
Megjelenés:	Cereal Research Communications. - 37 : Suppl. (2009), p. 45-48. -
További szerzők:	Széles Adrienn (1980-) (okleveles agrármérnök)
Internet cím:	elektronikus változat
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