The effect of sodium fertilization on the yield, quality and mineral composition of orchard grass (Dactylis glomerata)
1995
Tuma, J. | Matula, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
The effect of sodium fertilization was studied in the small-plot field trials with orchard grass (Dactylis glomerata) in pure culture with four-cut utilization. A dose of 40 kg Na/ha was applied early in the spring with the first nitrogen application to the first cut. Sodium fertilization significantly increased exchangeable sodium content in soil, sodium concentration in soil solution increased as well. The highest increase in sodium content was achieved not earlier than in the third year with an average value of 1,703 mg Na/kg. Sodium content in herbage greatly depends not only on sodium fertilization, but also on the system of fertilization by the other nutrients, on their content and mutual relationships in soil. Potassium can most affect the uptake of the other cations; the falling proportion of potassium is evident in particular years which corresponded with changes in content and activity of potassium in soil. On the other hand, increasing proportion of calcium, magnesium and sodium is evident. Sodium fertilization contributed significantly to the decrease in K/Na ratio. A marked effect of sodium fertilization was manifested also in a ratio K/Ca+Mg+Na which also fell to the lowest value. Sodium fertilization had no significant influence on the other conditions, e.g. K/Mg, K/Ca+Mg and had no significant effect on indicators of nutritive value of the herbage.
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