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Relay cropping of spring barley and winter wheat

Roslon, Ewa (2003). Relay cropping of spring barley and winter wheat. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Agraria, 1401-6249 ; 427
ISBN 91-576-6464-1
[Doctoral thesis]

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The general objective of this thesis was to investigate various management practices in order to design a relay cropping system of spring barley and winter wheat with high yielding capacity and good weed suppressive capability under Swedish conditions. The work consisted of two greenhouse experiments, one small-scale field experiment and two field experiments. The factors investigated were seed rate of barley and wheat, undersowing time of wheat and timing of nitrogen fertilisation. Wheat seed rate varied from 187 kg ha-1 to 50% and 25% of that rate, while barley seed rate varied from 328 kg ha-1 to 67%, 45% and 29% of that rate. The plant stand at the highest wheat seed rate was most competitive against perennial weeds and total weeds in the first growing season and total weeds in the second growing season. In addition, this plant stand was most productive in terms of biomass and grain yield of wheat. Moreover, increased wheat seed rate did not negatively influence barley biomass or grain yield and therefore the high wheat seed rate could be used in the relay cropping system for weed control purposes. Increased seed rate of barley reduced wheat biomass production in the absence of weeds, but less so in the presence of weeds. However, wheat biomass was reduced by weed competition, independent of seed rates. In order to promote wheat performance, a lower barley seed rate than normally employed in monoculture can be used. However, only in situations with weakly competitive weeds. By utilizing the time of nitrogen application and time of undersowing of wheat, it was possible to alter the competitive balance between barley and wheat. Winter wheat affected barley more negatively when the two crops were sown simultaneously than when wheat was sown one week later than barley. When sown immediately after barley, winter wheat was independent of the nitrogen application time. However, winter wheat undersown one week later than barley was at a disadvantage, while the barley was favoured. Spring barley and winter wheat grown in the field system had grain yields within the normal range, for barley 2655 kg ha-1 to 4580 kg ha-1. For the seed rate 187 kg ha-1, the grain yield of wheat was 5610 kg ha-1. Thus the results indicate that relay cropping of spring barley–winter wheat is possible. However, before the system can be used optimally, it still remains many basic issues to be resolved.

Authors/Creators:Roslon, Ewa
Title:Relay cropping of spring barley and winter wheat
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Agraria
Year of publishing :November 2003
Number of Pages:35
ALLI. Roslon, E., U. Boström & M. Hansson. Growth dynamics in relay-cropped cereals in relation to weed competition: a greenhouse experiment. Biological agriculture & Horticulture. (Submitted). II. Roslon, E. Crop response to timing of nitrogen application at two times of undersowing of winter wheat in a relay cropping system with barley as main crop. (Manuscript). III. Roslon, E. & H. Fogelfors. Crop and weed growth in a sequence of spring barley and winter wheat crops established together from a spring sowing (relay cropping). Journal of Agronomy and Crop Science, 189, 185-190 (2003). IV. Roslon, E. Relay cropping of spring wheat and winter wheat in relation to management practices. (Manuscript).
Place of Publication:Uppsala
ISBN for printed version:91-576-6464-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
F Plant production > F08 Cropping patterns and systems
Subjects:Not in use, please see Agris categories
Agrovoc terms:plant production, hordeum, plant competition, cropping systems, nitrogen, planting stock, seeds, sinapis, sowing date, triticum aestivum, weed control
Keywords:crop competition, crop production, Hordeum distichon L., nitrogen timing, nurse croping, seed rates, Sinapis arvensis L., sowing time, Triticum aestivum L., weed control
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ID Code:384
Department:(NL, NJ) > Institutionen för ekologi och växtproduktionslära (fr.o.m. 990101)
Deposited By: Staff Epsilon
Deposited On:17 Nov 2003 00:00
Metadata Last Modified:02 Dec 2014 10:04

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