Aufhammer 2


Die Bodenkultur - Journal for Land Management, Food and Environment

W. AUFHAMMER, A. FIEGENBAUM and E. KÜBLER:

Nitrogen residues of field beans (Viciafaba L.)

Part 1: Nitrogen accumulation and nitrogen residues

Summary

The objectives of the study were the variability of nitrogen accumulation and nitrogen residues of field beans (Vicia faba L.) as dependant on growing conditions, Moreover, the relations between the seed yield production and the nitrogen residues of field beans were investigated. Factorial field experiments were conducted in 1990 at one location including two cultivars (Alfred, Mythos) and in 1991 at two locations including one cultivar (Mythos) but two different row distances (20/25 cm, 40 cm) at identical planting densities. At maturity the dry weights of the plants (dt/ha), the N-content (%), the N-amounts (kg N/ha) accumulated in vegetative plant fractions and the seeds separately, and the Nmin-residues (kg NOs-N/ha) in the soil were measured.

The accumulated amounts of nitrogen and the nitrogen residues of comparable treatments differed as dependant on growing conditions up to 225 and 90 kg N/ha, respectively and as dependant on row distances up to 90 and 65 kg N/ha, respectively. The residues were composed of quantitatively different fractions of very different N-contents and C : N-relations. The N-residues in vegetative fractions were positively correlated with the seed yields.

Key-words: field beans, nitrogen accumulation, nitrogen residues.