Quality of maize ( <i>Zea mays</i> L.) kernels as affected by the NP supplies of the soil
2007
Izsáki, Z.
In a long-term mineral fertilisation experiment with 64 treatments representing all possible combinations of four rates each of N, P and K, set up on chernozem meadow soil in Szarvas in 1989, the protein and oil contents and the amino acid and fatty acid compositions of the maize grain yield were analysed between 1997 and 2004.The protein content of the maize kernels increased by 1.1–1.5 percentage points up to a NO <sub>3</sub> -N level of 80–100 kg ha <sup>−1</sup> in the 0–60 cm soil layer prior to sowing. The year had a greater influence on the protein content than the N supplies. No consistent effect of N on the amino acid composition, detectable as a change in the ratio of any amino acid in the majority of experimental years, was observed. In the AL-P <sub>2</sub> O <sub>5</sub> range of 120–362 mg kg <sup>−1</sup> in the ploughed layer, the soil P supplies had no statistically significant effect on the kernel protein content. In most years the P supplies had little effect on the amino acid composition of the protein. The oil content and fatty acid composition of maize kernels was extremely stable, and was very little affected by the nutrient supplies or the year. During the experimental period excessive N supplies were only found to reduce the oil content and modify the fatty acid composition on one occasion. The oil content and fatty acid composition were not substantially affected by the P supplies.
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