Ievina Sturite

Forsker

(+47) 934 99 484
Ievina.Sturite@nibio.no

Sted
Steinkjer

Besøksadresse
Ogndalsveien 2, 7713 Steinkjer

Sammendrag

The decline of soil organic carbon (SOC) content is a major concern in agricultural soils, and reduction of tillage frequency is proposed as a measure to counteract this tendency. Here, we assessed the effect of tillage and renewal frequency on grassland SOC content based on a long–term experiment at Fureneset, Western Norway. The objective was to compare permanent and unrenewed grassland treatments with treatments ploughed and renewed 6 to 15 times from 1974 to 2016. Mean SOC content of the permanent grassland was 64 ± 9 g kg−1 (one standard deviation) at 0 to 40 cm depth and soil contained 210 Mg C ha−1, compared to 60 ± 6 g kg−1 and 190 Mg C ha−1 for grassland renewed with ploughing. Higher SOC contents were associated with reduced forage dry matter yields (DMY) of the permanent grassland, but not in frequently renewed grasslands. High SOC contents correlate with high porosity and water content, as soil properties approach those of organic soils. This may cause a wetter soil and reduced plant growth and increase soil compaction. In areas with generally high SOC contents in agricultural soils, increased carbon content due to no tillage may thus make the soils more agronomically challenging to manage

Sammendrag

Rapporten gir en oversikt over klimarisiko for noen jordbruksproduksjoner i Trøndelag. Basert på forventede endringer i klima er det vurdert både muligheter og utfordringer for korn, grovfôr og grønnsaksproduksjon i Trøndelag. I klimatilpasning er det vektlagt kunnskap om lokalt jordsmonn for tilpasning av drenering, maskiner og jordarbeiding, tilpasning av vekster og agronomisk praksis. This report gives a short overview of climate risk for certain agricultural productions in Trøndelag. Based on expected changes in climate both opportunities and challenges are included for cereal, fodder and vegetable productions. Knowledge about soil and soil quality for adaptation of drainage, soil tillage, machinery and choice of crops and agronomic practice is emphasized.