In the 13th year of a long-term fertilisation experiment set up on calcareous loamy chernozem soil, tests were made in 1986 on the effects of various N, P and K supply levels and their combinations on the contents, ratios and uptake of macro- and microelements in various organs of the malting barley variety Opal in the course of the vegetation period. The soil of the experimental location contained an average of 3% humus, 5% CaCO3 and 20% clay in the ploughed layer, and was supplied moderately well with N and K and poorly with P and Zn. The experiment consisted of 4N×4P×4K = 64 treatments in two replications, giving a total of 128 plots. The fertilisers were applied in the form of calcium ammonium nitrate, superphosphate and potassium chloride. The groundwater was at a depth of 13-15 m and there was drought when the crop ripened in July. The main results can be summarised as follows: 1. Improved N fertilisation increased the concentration of all the elements except P in the vegetative plant organs. K fertilisation stimulated the incorporation of K and Na into the plants organs and inhibited that of Ca, Mg and Mn. The application of P fertiliser increased the P and Ca content in the shoot and reduced that of N, K, Fc, Zn and Cu. The mass of the vegetative parts was doubled by combined NP fertilisation. 2. The optimum values in the shoot at the beginning of shooting, leading to maximum yield, amounted to: 3.0-4.0 % K, 2.0-3.0% N, 0.3-0.4 % P, 10-12 K/P, 8-10 N/P and 0.6-0.8 N/K. These data arc in good agreement with those reported in the literature and could be used as guidelines by the extension service for estimating the nutritional status of malting barley. The P/Zn ratio rose to above 200 in treatments with good P supplies. The P-Zn antagonism could lead to latent Zn deficiency on this type of soil, so Zn fertilisation could be effective in crops with a high Zn requirement. 3. The total harvested yield (5 t seed + 6 t by-products) contained 170 kg N, 120 kg K2O, 65 kg P2O5, 40 kg CaO, 24 kg MgO, 5 kg Na, 2 kg Fc, 0.6 kg Mn, 0.1 kg Zn and 50 g Cu (rounded figures). The specific element requirements for l t grain + the associated by-products amounted to 26 kg N, 16 kg K2O, 12 kg P2O5, 6 kg CaO, 4 kg MgO, 270 g Fc, 100 g Mn, 40 g Zn and 10 g Cu at the given location. These specific quantities could be used in making recommendations on the fertiliser requirements of the planned yield. 4. Under similar conditions a large yield with high quality will require fertilisation with approximately 100 kg/ha N and soil supplies of 150-200 mg/kg ammonium lactate (AL)-soluble P 2O5 and K2O in the ploughed layer.
|Number of pages||14|
|Publication status||Published - Feb 1 2004|
ASJC Scopus subject areas
- Agronomy and Crop Science