Journalartikel

Jahr der Veröffentlichung: 1992

Seiten: 65-76

Zeitschrift: Agribiological research : Zeitschrift für Agrarbiologie - Agrikulturchemie - Ökologie

Bandnummer: 45

Heftnummer: 1

ISSN: 0938-0337

Verlag: VDLUFA-Verl.

Abstract: 

A model is presented for the determination of nitrogen fertilizer rates for winter cereals. The model is based on soil nitrogen analysis by electro-ultrafiltration (EUF); it further more takes into account nitrogen released from green manure and from residues of the preceding crop according to the yield potential of the site. Soil samples were taken from the upper soil layer (0 cm to 30 cm) in late autumn. Nitrate and ammonium analyzed is taken into account for the 1st nitrogen split application, organic nitrogen, extracted by EUF for the following split applications.

The model was verified under field conditions. In 1989 (9 sites) average grain yield of winter wheat obtained according to the model recommendation amounted to 97 % of the economical maximum yield, 1990 (10 sites) 92 % of the economical maximum grain yield were obtained. The figures of winter barley (9 sites 1989 and 10 sites 1990) were 93 % and 97 % of the economical maximum yield, respectively. In those particulare experiments the consideration of average values for EUF-N(org) yielded virtually the same N-fertilizer recommendations than the consideration of the site specific N(org) data.

With 4 exceptions from 38 cases, nitrogen fertilizer rates recommended according to the model were lower than the rates requered for the economical maximum yield. Reasons why lower rates were recommended are discussed.

Sixty sites grown with winter wheat or winter barley and fertilized according to the model were analyzed with the 0.01 M CaCl2-method for rest nitrate + rest ammonium. Soil samples were taken from a soil depth of 0 cm to 90 cm in late summer. In 85 % of the soils analyzed the rest nitrate + rest ammonium was lower than 45 kg N ha-1. This finding shows that the model is also of ecological relevance.

Harvard-Zitierstil: BAREKZAI, A., STEFFENS, D., BOHRING, J. and ENGELS, T. (1992) PRINCIPLE AND VERIFICATION OF THE GIESSEN MODEL FOR NITROGEN-FERTILIZER RATES TO WINTER CEREALS BASED ON EUF SOIL ANALYSIS, Agribiological research : Zeitschrift für Agrarbiologie - Agrikulturchemie - Ökologie, 45(1), pp. 65-76

APA-Zitierstil: BAREKZAI, A., STEFFENS, D., BOHRING, J., & ENGELS, T. (1992). PRINCIPLE AND VERIFICATION OF THE GIESSEN MODEL FOR NITROGEN-FERTILIZER RATES TO WINTER CEREALS BASED ON EUF SOIL ANALYSIS. Agribiological research : Zeitschrift für Agrarbiologie - Agrikulturchemie - Ökologie. 45(1), 65-76.