Small grain screenings in wheat: interactions of cultivars with season, site, and management practices
D. L. Sharma A and W. K. Anderson BA Corresponding author; Centre for Cropping Systems, Department of Agriculture, Northam, WA 6401, Australia; email: dsharma@agric.wa.gov.au
B Department of Agriculture, 444 Albany Highway, Albany, WA 6330, Australia.
Australian Journal of Agricultural Research 55(7) 797-809 https://doi.org/10.1071/AR03265
Submitted: 22 December 2003 Accepted: 24 May 2004 Published: 2 August 2004
Abstract
Small grains that pass through a 2-mm slotted screen (sievings or screenings) are one of the most important causes of price dockages of wheat in Australia because grain size variation greatly affects flour yield and commercial value. The aims of this study were to examine the effects of season, time of sowing, plant population, and applied nitrogen, and their interactions with cultivars, on small grain screenings. Twenty-one field experiments involving 16 new cultivars and elite crossbreds, and various management variables, were conducted in the medium (annual rainfall 325–450 mm) and low (annual rainfall <325 mm) rainfall zones of the Northern Agricultural Region of Western Australia over 3 diverse cropping seasons (1999–2001).
Rainfall events towards the end of the season were critical to the level of screenings. Screenings were higher in season 2000 with terminal drought stress, but were low in 2001 despite severe drought stress during early growth. Delayed seeding caused higher screenings in 1999 (average rainfall with even distribution) and in 2000 (terminal drought) but not consistently in 2001 when early drought stress restricted tillering and spike size thereby constraining the yield level. Strong varietal and time of sowing interactions were evident but the relationship between maturity group and the level of screenings was not consistent. Rather, the ability of cultivars to adjust yield components was more important; 82% of the total variance in small grain screenings was accounted for by a regression model based on variety-specific kernel weight, post-heading rainfall (from about 2 weeks before anthesis), and location factors.
The effect of increasing plant population on screenings was mostly negative, with some minor exceptions for a few cultivars in the low-rainfall zone. As applied nitrogen was increased, screenings generally increased and cultivar influenced this trend more than rainfall zone. It is postulated that for a cultivar to be unaffected by applied nitrogen, it should have inherently higher grain weight as well as high stability of grain weight across nitrogen levels. Applied nitrogen had a significant effect on screenings only at higher plant populations.
In experiments where the level of screenings exceeded 5%, the yield components that were significantly associated with screenings, in order of relative importance, were grain weight > grain number/area > grain number/head > grain yield. Cultivars differed in production of screenings in response to plant population, nitrogen fertiliser and sowing time. Harrismith was the most sensitive cultivar and Wyalkatchem was overall the most tolerant cultivar. Delayed seeding had the least effect on the screenings of cultivars Westonia, Carnamah, and Wyalkatchem. Carnamah was the most stable cultivar against higher levels of applied nitrogen, whereas Westonia required high plant numbers to contain screenings. It is concluded that cultivars can be classified according to specific sensitivities, and appropriate management practices may be suggested to growers.
Additional keywords: yield components, water stress, rainfed farming.
Acknowledgments
We thank the farmers who accommodated our field experiments at their properties: Avon Warr (Yuna), Nino Messina (Mullewa), E. F. Smart and Partners (Erragulla plains), Gordon Campbell (Mingenew), C. J. Cosgroves (Depot Hill, Mingenew), Gary McCagh (South Mingenew), and Miles Scott (Watheroo). Thanks are due to the Mullewa Research Support Unit for sowing and harvesting field experiments and to Ms Sheena Lyon and Mrs Anne Smith for technical support in the data collection. Statistical help was provided by Mr Mario D’Antuono. Financial support from the Grains Research Development Corporation is gratefully acknowledged.
Anderson WK,
Crosbie GB, Lambe WJ
(1997) Production practices in Western Australia for wheats suitable for white, salted noodles. Australian Journal of Agricultural Research 48, 49–58.
| Crossref |
Anderson WK,
Crosbie GB, Lemsom K
(1995) Production practices for high protein, hard wheat in Western Australia. Australian Journal of Experimental Agriculture 35, 589–595.
Anderson WK,
French RJ, Seymour M
(1992) Yield responses of wheat and other crops to agronomic practices on duplex soils compared with other soils in Western Australia. Australian Journal of Experimental Agriculture 32, 963–970.
Anderson WK, Sawkins D
(1997) Production practices for improved grain yield and quality of soft wheats in Western Australia. Australian Journal of Experimental Agriculture 37, 173–180.
| Crossref |
Aspinall D
(1965) The effects of soil moisture stress on the growth of barley. II. Grain growth. Australian Journal of Agricultural Research 16, 265–275.
| Crossref |
Australian Wheat Board (2000).
Barr AR,
Jefferies SP,
Ward P,
Tasker SD,
Hoppo TM,
Dube A, Lewis J
(1994) Registration of Australian winter cereal cultivars. Avena sativa (oats) cv. Potoroo. Australian Journal of Experimental Agriculture 34, 706–707.
Bremmer PM, Rawson HM
(1978) The weights of individual grains of the wheat ear in relation to their growth potential, the supply of assimilate and interaction between grains. Australian Journal of Plant Physiology 5, 62–72.
Calderini DF,
Abeledo LG,
Savin R, Slafer GA
(1999) Final grain weight in wheat as affected by short periods of high temperature during pre- and post-anthesis under field conditions. Australian Journal of Plant Physiology 26, 453–458.
Conry MJ
(1997) Effect of fertiliser N on the grain yield and quality of spring malting barley grown on five contrasting soils in Ireland. Biology and Environment 97, 185–196.
Cooperative Bulk Handling Ltd
(2001) Annual report. Western Australia.
Cranstoun DAS, Garstang JR
(1993) The effect of husbandry inputs on the quality of spring malting barley with special reference to screenings. Aspects of Applied Biology 36, 211–220.
Eagles HA,
Bedggood AG,
Panozzo JF, Martin PJ
(1995) Cultivar and environmental effects on malting quality in barley. Australian Journal of Agricultural Research 46, 831–844.
| Crossref |
Gan Y,
Stobbe EH, Moes J
(1992) Relative date of wheat seedling emergence and its impact on grain yield. Crop Science 32, 1275–1281.
GenStat (2002).
Gruszka J, Martyniak L
(1995) Evaluation of the appropriateness of sprinkler irrigation of bread wheat in the Kujawy region. Wiadomoci Instytutu Melioracji i Uzytków Zielonych 18, 245–256.
Hashem A, Wilkins N
(2002) Competitiveness and persistence of wild radish (Raphanus raphanistrum L.) in a wheat-lupin rotation. ‘Proceedings of 13th Australian Weeds Conference’. (Ed. HS Jacob ,
J Dodd ,
JH Moore )
pp. 712–715. (Plant Protection Society of Western Australia Inc.: Victoria Park)
van Herwaarden AF,
Angus JF,
Richards RA, Farquhar GD
(1998) Haying-off, the negative grain yield response of dryland wheat to N fertiliser. II. Carbohydrate and protein dynamics. Australian Journal of Agricultural Research 49, 1083–1093.
| Crossref |
Lee SH,
Scott WR, Love BG
(1989) Sources of screenings in malting barley in relation to the pattern of tillering Proceedings Annual Conference of the Agronomy Society of New Zealand
, 43–54.
Littlewood N
(2002) 2003 Crop variety sowing guide for Western Australia. Bulletin 4566, Department of Agriculture, Western Australia.
Miralles DJ, Slafer GA
(1995) Individual grain weight responses to genetic reduction in culm length in wheat as affected by source-sink manipulations. Field Crops Research 43, 55–66.
| Crossref | GoogleScholarGoogle Scholar |
de Ruiter JM
(1999) Yield and quality of malting barley (Hordeum vulgare L. ‘Valetta’) in response to irrigation and N fertilisation. New Zealand Journal of Crop and Horticultural Science 27, 307–317.
Sadras V,
Roget D, O'Leary G
(2002) On-farm assessment of environmental and management factors influencing wheat grain quality in the Mallee. Australian Journal of Agricultural Research 53, 811–820.
| Crossref | GoogleScholarGoogle Scholar |
Schoknecht N
(2002) Soil groups of Western Australia: a simple guide to the main soils of Western Australia. Department of Agriculture, Government of Resource Management Technical Report No.246, Western Australia.
Shackley B
(2000) Small grain screenings in wheat – the agronomic issues. ‘Western Australia crop updates 2000: cereal updates’. (Eds C Zaicou-Kunesch, N Kerr, JH Moore)
pp. 71–72. (Agriculture Western Australia)
Sharma DL, Anderson WK
(2001) Agronomic responses of new wheat cultivars in the northern wheat belt. ‘Western Australia crop updates 2001: cereal updates’. (Eds R Jettner, J Johns, JH Moore)
pp. 41–42. (Agriculture Western Australia)
Walkley A, Black IA
(1934) An examination of the Degtjaroff method for determining organic matter and a proposed modification of the chromic acid titration method. Soil Science 37, 29–33.
Xue QM, Stougaard QN
(2002) Spring wheat seed size and seeding rate affect wild oat demographics. Weed Science 50, 312–320.
