Mikroelem-terhelés hatása a repcére (Brassica napus L. ssp. oleifera) karbonátos homoktalajon

Translated title of the contribution: Effect of microelement loads on rape (Brassica napus L. ssp. oleifera) grown on calcareous sandy soil

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The effect of 0, 30, 90 and 270 kg•ha-1 microelement loads on rape was investigated on a calcareous sandy soil in the region between the Danube and Tisza rivers. The salts of the microelements, in the form of Cr 2(SO4)3, K2Cr2O 7, CuSO4, Pb(NO3)2, Na 2SeO3 and ZnSO4, were applied on a single occasion at the start of the experiment in spring 1995. The four rates of six elements in three replications gave a total of 72 plots, each measuring 7×5 m = 35 m2. The growing site, which had the poor moisture regime characteristic of sandy soils, was prone to drought and poorly supplied with macroelements (NPK). The ploughed layer contained 0.7-1.0% humus and 2-3% CaCO3. The groundwater was located at a depth of 5-10 m. Basic fertilization with 100 kg each of N, P2O5 and K 2O per hectare was applied to the whole experiment every year. The main results were as follows: - In the course of the 10-month vegetation period, the winter rape crop received a total of 545 mm precipitation. Due to the dry weather in autumn and winter, the seed yield hardly reached 1 t•ha -1 and the by-product yield was 5 t•ha-1 on the untreated soil. In response to rising rates of Se the seed yield dropped significantly by 45% and the by-product yield by 22% compared with the control, when the carry-over effect was examined in the 7th year. The carry-over effect of the other elements was not significant. - On contaminated soil the maximum Cr concentration in the straw at harvest was 0.4 and 1.6 mg•kg-1 in the Cr(III) and Cr(VI) treatments, respectively. There was no significant Cr accumulation in the seed in either treatment. The Pb content reached 0.6 mg•kg-1 on soil severely loaded with lead, but in all cases the content in the seed was below the detection limit. The Cu content, too, increased hardly perceptibly in the seed, and the Zn content did not change as the Zn rate increased. In the by-products, however, the Cu and Zn contents both doubled. Selenium exhibited hyperaccumulation in both plant organs, with a concentration increase of two orders of magnitude, making the rape seed and the by-products unsuitable for human and animal consumption, respectively. - The quantity of Cr incorporated into the aboveground yield of rape at harvest amounted to 2.8 and 10 g•ha-1 in the Cr(III) and Cr(VI) treatments, respectively. The maximum uptake of Pb, Cu, Zn and Se was 3.6, 30, 109 and 1660 g•ha-1, respectively. Some 93% of the Se absorbed was accumulated in the by-products. The time required for the complete phytoremediation of soil contaminated with the 270 kg•ha-1 rate would be 163 years for Se, 2477 years for zinc, 9000 years for copper, 27,000 years for chromium Cr(VI) and 75,000 years for lead, assuming the same farming conditions. - On the untreated control soil the specific element content of 1 t seed + the associated by-products (kg•t-1) was 78 for N, 46 for P2O5, 96 for K2O, 158 for CaO and 27 for MgO. This is around twice the specific contents recommended by the Hungarian extension service for K2O and three times as high for CaO and MgO, partly due to the very wide by-product/main product ratio and partly as a consequence of the calcareous soil.

Original languageHungarian
Pages (from-to)371-382
Number of pages12
JournalAgrokemia es Talajtan
Issue number2
Publication statusPublished - Dec 1 2011


ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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