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Report1999Open access

Vädrets och kvävegödslingens inverkan på växtproduktion och näringsupptag i bördighetsförsöket R3-9008, 1985-1992

Haak, Enok
Haak, Enok (ed.)


During 1985-92 a special fertility experiment, R3-9008, was carried out on the SVALÖV-WEIBULL experimental farm at Örja, near Landskrona with the aim to study the influence of year and climate on crop development and yield. In the experiment, auxillary to the longterm fertility experiment in series R3-9001, on the same site, barley, spring rape and sugar-beet were grown during two crop rotations. The crops, basically fertilized with P and K as in C2 of the R3-9001-series, and with three N-rates, N1, N2 and N3, were sampled every 14th day during the growth season for analysis of growth and mineral contents. Yield was determined at maturity . Ten climate parameters were recorded at the site. Six of them, wind velocity, air temperature, relative humidity, global radiation, sunshine hours and precipitation were measured daily, and used to interpret the experimental results. The yields of economically important products varied with crop and N-fertilization. The dry matter and nutrient yields were larger without N-fertilization than in N-fertilized treatments, N1 and N2. The N-regime as such influenced N-status in the soil, as revealed by the N-status determined the year after the experiment, 1993, when treatments N2 and N3 were compared with treatment N1. The site seems to be more reliable for growth of cereals than for oil crops and sugar-beets, indicating that weather has a larger impact on the development and yield of the two latter crops. For sugar-beet with a longer growth period, this is natural as autumn temperature limits sugar yield in Sweden. In the model work, soil water and temperature conditions were first simulated in a SOIL-model. The nitrogen turnover was first simulated using the output of SOIL as input to a SOILN model. The output of SOILN was then used as input to a NITROGEN sub-mode1 linked to a BIOMASS submodel of a CROP-GROWTH model. Using this set of models, the growth and translocation of dry weight and nitrogen to grain (seed, beets) from roots, stems and leaves were measured and compared with simulations of the three N treatments in four crops of the year 1985. This mode1 system, which fits biomass and nitrogen flow to the crop's light absorption and to response functions of temperature, water and nitrogen status in the soil, is considered to be promising. An extension of the work to all 96 year * crop * N-treatment combinations is considered valuable


Tillväxtmodeller; SOIL-modell; SOILN-modell

Published in

Rapport / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avd. för växtnäringslära
1999, number: 200
Publisher: Inst. för markvetenskap, Sveriges lantbruksuniversitet

UKÄ Subject classification

Agricultural Science

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