Effect of fertilization on consumption of potassium and magnesium by grain yield of winter wheat
2001
Baier, J. | Baierova, V. | Bartosova, Z. (Vyzkumny Ustav Rostlinne Vyroby, Praha (Czech Republic))
During 1989-1992, the influence of fertilization on the relationship of potassium to magnesium taken off by the surface biomass of winter wheat (Viginta variety) was studied during the long-term nutritional experiments in three variants of fertilization (021 - the absolute non-fertilized variant, 011 - the variant fertilized with manure and 014 - the variant fertilized with manure + NPK-fertilizers) at three different localities (more arid in Pohorelice, semi-arid in Caslav and more humid in Lukavec). It results that the K/Mg relationship at the fertilized variants was wider in comparison with the non-fertilized variant. The influence of manure itself was not so significant as using manure and the NPK-fertilizers. The average relationship at non-fertilized variants had the value of 5.40 - 6.62 : 1, while the value for fully fertilized variants was 8.52 - 8.85 : 1. At the non-fertilized variant, the average intake of potassium was 74.2 kg.ha-1, the intake of magnesium was 12.0 kg.ha-1. At fully fertilized variant, the potassium intake was higher by 63.9%, and the magnesium intake by 17.5%. Due to more significant influence of full fertilizing on the potassium intake, less favourable conditions were created for the nutrition of winter wheat by magnesium. One metric ton of grain took off 1.90 kg of magnesium at non-fertilized variant and 2.17 kg of magnesium at fully fertilized variant. The high variability of potassium intake value (46.4% at the non-fertilized variants numbered 021 and 38.0% at fully fertilized variants 014) and contrary to it, low variability of the values of magnesium intake (22.7 and 19.7%) indicates a closer dependence of the yield level to magnesium intake
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