ISSN:
1573-0867
Schlagwort(e):
calcium nitrate
;
growth stages
;
sodium selenate-enriched fertilizers
;
Se concentration
;
silty clay soil
;
top-dressing
;
wheat
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Abstract A greenhouse experiment was conducted to evaluate the effect of Se contained in calcium nitrate, top-dressed at different growth stages, on the Se concentration in wheat (Triticum aestivum L.). Selenium as sodium selenate was added to Ca (NO3)2 and NPK (21-4-10) during the manufacturing process. A silty clay soil with soil pH of 6.1 was used. Four selenium treatments incorporated in Ca (NO3)2 were top-dressed at both the tillering and heading growth stages at rates of 0, 15, 30, and 45 mg kg−1 of Ca (NO3)2 fertilizer equivalent to about 0, 0.003, 0.007, 0.01 mg Se kg−1 soil, respectively. A fifth treatment of 20 mg Se kg−1 of NPK (21-4-10%) equivalent to 0.007 mg Se kg−1 soil was basal dressed at the time of sowing. Calcium nitrate with or without Se was top-dressed at the rate of 35 mg N kg−1. In addition all pots received a basal dose of N at the rate of 7 0 mg N kg−1 through a NPK(21-4-10) fertilizer. The Se-enriched Ca (NO3)2 increased the uptake and concentration of Se in wheat significantly (ρ〉0.05) with increasing concentration of Se in the fertilizer applied. The Se concentration in wheat grain increased from 〈1.1 to 468µg Se kg−1 in the first year when the concentration in the Se-enriched Ca (NO3)2 was increased from 0 to 45 mg Se kg−1 but the corresponding increase in the second and third year was lower. The Se concentration in the grain was more than twice of that in the straw. The uptake and concentration of Se in wheat, except in the second year, was generally higher when Se was top-dressed at heading as compared to that when it was top-dressed at tillering but the concentration differences between time of application were not statistically significant(ρ〉0.05). Basal application of Se-enriched NPK (0.007 mg Se kg−1 soil) was only half as effective as an equivalent rate of Se in top-dressed Seenriched Ca(NO3)2 in increasing the Se concentration in wheat and the concentration levels among these treatments were significantly (ρ〉0.01) different. It was concluded that topdressing of Se-enriched Ca(NO3)2 at 30 mg Se kg−1 is an effective method of application to increase the Se concentration in wheat grain to a level, 〉 100µg kg−1 dry matter, considered adequate for human consumption.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00749692
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