Integration of agronomic practices and herbicides for sustainable weed management in a zero-till barley field pea rotation

被引:26
作者
Blackshaw, RE
Moyer, JR
Harker, KN
Clayton, GW
机构
[1] Agr & Agri Food Canada, Lethbridge Res Ctr, Lethbridge, AB T1J 4B1, Canada
[2] Agr & Agri Food Canada, Lacombe Res Ctr, Lacombe, AB T4L 1W1, Canada
关键词
fertilizer timing; integrated weed management; reduced herbicide rate; seed date; seed rate; weed competition;
D O I
10.1614/WT-04-128R
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Research is needed to develop more comprehensive integrated weed management systems that would facilitate greater adoption by farmers. A field study was conducted to determine the combined effects of seed date (April or May), seed rate (recommended or 150% of recommended), fertilizer timing (fall or spring applied), and in-crop herbicide rate (50 or 100% of recommended) on weed growth and crop yield. This factorial set of treatments was applied in four consecutive years within a barley-field pea-barley-field pea rotation in a zero-till production system. Both barley and field pea phases of the rotation were grown each year to account for variable environmental conditions over years. Weed biomass was often lower with May than with April seeding because of more weeds being controlled with preplant glyphosate. However, despite fewer weeds being present with May seeding, barley yield was only greater in 1 of 4 yr and field pea yield was actually lower with May than with April seeding in 3 of 4 yr, indicating that optimum seed date is highly dependent on crop species and environmental conditions. Higher crop seed rates reduced weed biomass and increased crop yield in 2 of 4 yr in each of barley and field pea.. Fertilizer timing had little effect on weed competition in barley, but spring- compared with fall-applied fertilizer reduced weed biomass and increased field pea yield in 2 of 4 yr. In-crop herbicides applied at 50% compared with 100% rates sometimes resulted in greater weed biomass and lower crop yields with recommended crop seed rates, but few differences were noted at high crop seed rates. Indeed, the weed seed bank at the conclusion of the 4-yr study was not greater with the 50% compared with 100% herbicide rate when high crop seed rates were used. This study demonstrates the combined merits of early seeding (April), higher crop seed rates, and spring-applied fertilizer in conjunction with timely but limited herbicide use to manage weeds and maintain high yields in rotations containing barley and field pea.
引用
收藏
页码:190 / 196
页数:7
相关论文
共 20 条
[1]   Nitrogen fertilizer timing and application method affect weed growth and competition with spring wheat [J].
Blackshaw, RE ;
Molnar, LJ ;
Janzen, HH .
WEED SCIENCE, 2004, 52 (04) :614-622
[2]   Weed species response to phosphorus fertilization [J].
Blackshaw, RE ;
Brandt, RN ;
Janzen, HH ;
Entz, T .
WEED SCIENCE, 2004, 52 (03) :406-412
[3]  
Blackshaw RE, 2000, WEED TECHNOL, V14, P389, DOI 10.1614/0890-037X(2000)014[0389:UOWSRT]2.0.CO
[4]  
2
[5]   A comparison of methods to predict weed seedling populations from the soil seedbank [J].
Cardina, J ;
Sparrow, DH .
WEED SCIENCE, 1996, 44 (01) :46-51
[6]   Weed dynamics and management strategies for cropping systems in the northern Great Plains [J].
Derksen, DA ;
Anderson, RL ;
Blackshaw, RE ;
Maxwell, B .
AGRONOMY JOURNAL, 2002, 94 (02) :174-185
[7]  
Gill KS, 1997, TECHNIQUES REDUCING, P237
[8]   Nutrient considerations for diversified cropping systems in the northern Great Plains [J].
Grant, CA ;
Peterson, GA ;
Campbell, CA .
AGRONOMY JOURNAL, 2002, 94 (02) :186-198
[9]  
Harker KN, 2001, CAN J PLANT SCI, V81, P339
[10]   WEED MANAGEMENT IN SPRING BARLEY (HORDEUM-VULGARE) IN THE ABSENCE OF HERBICIDES [J].
KIRKLAND, KJ .
JOURNAL OF SUSTAINABLE AGRICULTURE, 1993, 3 (3-4) :95-104