W. Aufhammer et al., NITROGEN RESIDUES OF FIELD BEANS (VICIA-F ABA L) .1. NITROGEN ACCUMULATION AND NITROGEN RESIDUES, Die Bodenkultur, 45(3), 1994, pp. 239-251
The objectives of the study were the variability of nitrogen accumulat
ion 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 in
cluding two cultivars (Alfred, Mythos) and in 1991 at two locations in
cluding one cultivar (Mythos) but two different row distances (20/25 c
m, 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) acc
umulated in vegetative plant fractions and the seeds separately, and t
he N(min)-residues (kg NO3-N/ha) in the soil were measured. The accumu
lated amounts of nitrogen and the nitrogen residues of comparable trea
tments differed as dependent 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 di
fferent fractions of very different N-contents and C: N-relations. The
N-residues in vegetative fractions were positively correlated with th
e seed yields.