Crop rotation effect on wheat grain yield as mediated by changes in the degree of water and nitrogen co-limitation
Victor O. Sadras A C , Jeff A. Baldock A , Jim W. Cox A and W. D. Bellotti BA CSIRO Land and Water & APSRU, Waite Campus, PMB 2, Glen Osmond, SA 5064, Australia.
B University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia.
C Corresponding author; email: victor.sadras@csiro.au
Australian Journal of Agricultural Research 55(6) 599-607 https://doi.org/10.1071/AR04012
Submitted: 19 January 2004 Accepted: 19 March 2004 Published: 7 July 2004
Abstract
Theoretically, growth of stressed plants is maximised when all resources are equally limiting. The concept of co-limitation could be used to integrate key factors affected by crop rotation. This paper tested the hypothesis that the effect of crop rotation on the yield of wheat is partially mediated by changes in the degree of co-limitation between nitrogen and water.
Four rotations were established on a sodic, supracalcic, red chromosol in a Mediterranean-type environment of southern Australia. Rotations included wheat grown after (a) faba bean harvested for grain, (b) faba bean incorporated as green manure, (c) ryegrass pasture, or (d) medic pasture; barley was grown after wheat in all cases. The response of wheat to the rotations during 3 growing seasons was analysed in terms of nitrogen and water co-limitation, and the response of barley was taken as a measure of the persistence of rotation effects.
Daily scalars quantifying water and nitrogen stress effects on tissue expansion were calculated with a crop simulation model. These scalars were integrated in a series of seasonal indices to quantify the intensity of water (SW ) and nitrogen stress (SN ), the aggregated intensity of water and nitrogen stress (SWN ), the degree of water and nitrogen co-limitation (CWN ), and the integrated effect of stress and co-limitation (SCWN 25 CWN/SWN ). The expectation is that grain yield should be inversely proportional to stress intensity and directly proportional to degree of co-limitation, thus proportional to SCWN .
Combination of rotations and seasons generated a wide variation in the amount of water and inorganic nitrogen in the 1-m soil profile at the time of wheat sowing. Plant-available water ranged from 33 to 107 mm, and inorganic nitrogen from 47 to 253 kg N/ha. Larger amounts of nitrogen were found after green-manured faba bean, and smaller after grass pasture. There was a consistent effect of rotation on wheat yield and grain protein content, which persisted in subsequent barley crops. Measured grain yield of wheat crops ranged from 2.5 to 4.8 t/ha. It was unrelated to water or nitrogen stresses taken individually, inversely related to the aggregated stress index SWN , and directly related to the CWN index of co-limitation. The combination of stress and co-limitation in a single index SCWN accounted for 65% of the variation in measured crop yield. This is a substantial improvement with respect to the stress effect quantified with SWN , which accounted for 43% of yield variation. It is concluded that rotation effects mediated by changes in the relative availability of water and nitrogen can be partially accounted for by degree of resource co-limitation.
Additional keywords: barley, fertiliser, grain protein, legumes, modelling, pastures, resource limitation, stress, water-use efficiency.
Acknowledgments
We thank Louis Maratos and Damian Mowat for collection and processing of the soil samples; Chris Penfold, Chris Hill, and John Vandeleur for all agronomic aspects of the study; G. Borgognone, P. Hayman, S. Milroy, C. Smith, M. Unkovich, and E. Wang for useful discussions; and the Grains Research and Development Corporation of Australia for financial support through projects CSO212 and CSO198.
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