Sammanfattning

The investigation showed that the N-balance, applied minus removed, for N-rates of normal size was lower in winter wheat following ley for grass production or fallow than wheat following cereals or oil seed. In barley the N-balance was the lowest after sugar beets and the highest after spring cereals. It was also shown that the N-balance was lower on soils with clay contents of 15-25% than on soils with more or with less clay. Regional comparisons of the N-balance showed increasing values from south to north. Calculations of the N-balance at economic optimum N-rates showed N excess values from 10 to 27 kg ha-1 depending on region, clay content or preceding crop. For barley similar calculations gave values between 1 and 14 kg ha-1.

Nyckelord

Kväveoptimum; Regional balans; Lerhalt

Publicerad i

Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära
2003,
Utgivare: Institutionen för markvetenskap, Sveriges lantbruksuniversitet

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/125766