Sammanfattning

Various indices are applied to evaluate the nutrient (mostly nitrogen, N) use efficiency of plants, but those indices have rarely been compared across different crops, and the co-limitation of growth by nutrients other than N is usually not considered.To conceptually and quantitatively compare the indices of a plant-level, a plant-soil-level and a field-level (difference) method for the assessment of N use across a set of different annual and perennial crops; and to use some plant-level indices for exploring the co-limitation of growth by nutrients other than N in wheat.Data sets from previously published studies on wheat (grain), maize (feed), potato (starch), grassland ley (feed) and Salix (bio-energy) field-grown in Sweden were re-analyzed.This study is first in conceptually and quantitatively comparing various popular N use indices across a wide range of annual and perennial crops; and also proposes a methodology for exploring the co-limitation of growth by nutrients other than N. When comparing the plant-level and plant-soil-level methods, the indices relating crop yields to the amounts of plant-internal N were correlated, while the N-uptake indices were not. Only few of the field-level (difference-method) indices were correlated with indices of the two other methods.

Nyckelord

Agricultural crops; Element stoichiometry; Nitrogen; Nutrient use efficiency; Phosphorus

Publicerad i

Plant and Soil
2018, Volym: 430, nummer: 1-2, sidor: 7-21

SLU författare

• Weih, Martin

  • Institutionen för växtproduktionsekologi, Sveriges lantbruksuniversitet
    

• Hamnér, Karin

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    

• Pourazari, Fereshteh

  • Institutionen för växtproduktionsekologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Jordbruksvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1007/s11104-018-3738-y

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/96148