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Cereal Research Communications

, Volume 35, Issue 4, pp 1701–1711 | Cite as

N and P Impact on the Yield of Maize in a Long-Term Trial

  • Z. IzsákiEmail author
Article

Abstract

In order to elaborate site-specific, environmentally sound fertiliser recommendations aimed at achieving an economic yield level in maize, the N and P supplies of the soil, the N and P effects detectable in the yield, and the limit values for N and P supply levels were investigated in a ten-year mineral fertilisation experiment set up on chernozem meadow soil.

Over the average of ten years, this chernozem meadow soil, which had a humus content of 2.8–3.2%, gave a grain yield of 6.10 t ha−1 without N fertiliser, the relative yield was 79% and N fertilisation gave a yield surplus of 1.35 t ha−1. The economic yield level was achieved when the NO3-N content of the upper 0–60 cm soil layer was 100–110 kg ha−1 prior to sowing. The mineral N content of the soil is a better indicator of the soil N supply level and of the N fertiliser requirements of maize than the humus content. On this acidic, clay loam soil, which had a P supply level of 120–160 mg kg−1 AL-P2 O5 without P fertilisation, the relative yield was 93%, averaged over 10 years, and the yield surplus 0.2 t ha−1. A P effect was only detected in approximately 50% of the years, when the economic yield level was achieved at an AL-P2 O5 supply level of 130–170 mg kg−1. On this acidic, clay loam, chernozem meadow soil, a limit value of 120–170 mg kg−1 AL-P2 O5 represented a good supply level.

Keywords

N and P supplies maize grain yield long-term experiment 

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Copyright information

© Akadémiai Kiadó, Budapest 2007

Authors and Affiliations

  1. 1.Faculty of Agricultural Water and Environmental ManagementTessedik Sámuel CollegeSzarvasHungary

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