| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a 9782 Merrill Rd., Whitmore Lake, MI 48189
b S.A. Clay, Plant Sci. Dep., South Dakota State Univ., Brookings, SD 57007
* Corresponding author (david_clay{at}sdstate.edu)
Received for publication June 21, 2001.
Interseeding a leguminous cover crop into corn (Zea mays L.) may reduce corn yields. By understanding the mechanisms responsible for yield reductions, improved management strategies can be developed. The objective of this study was to determine the influence of an annual medic (Medicago scutellata Mill cv. Sava) interseeded into corn at planting on N and water stress in corn. Field research was conducted at three South Dakota sites. Treatments were two broadcast medic (0 and 33 kg ha-1) and two N (0 or recommended) rates. Water infiltration was measured at Aurora in 1997 and 1998. Carbon-13 discrimination (
) in corn grain was measured at Aurora in 1998 and Beresford in 1998. Medic biomass at Aurora in 1997, Aurora in 1998, and Beresford in 1998 was 1290, 215, and 913 kg ha-1, respectively. At Aurora, on 11 July 1997, medic increased water infiltration from 0.0156 to 0.035 cm s-1. Similar results were measured at Aurora in 1998. Medic reduced corn growth as early as 17 July at Aurora in 1997 and 19 June at Beresford in 1998. Associated with reduced corn biomass production in the fertilized treatments were lower N concentration and fertilizer efficiency. Interseeding medic into corn did not increase in corn at Beresford in 1998 or Aurora in 1998. These results suggest that the negative effects of medic on corn primarily resulted from N stress and not increased water stress. Given these results, management strategies that reduce the competition between medic and corn for N should be developed.
Abbreviations: ET, evapotranspiration • , 13C discrimination • 
N stress, the change in 13C discrimination for each percentage of yield lost due to N stress • water stress, the change in 13C discrimination for each percentage of yield lost to water stress
This article has been cited by other articles:
|
|
 |
|
  D. N. Baributsa, E. F. Foster, K. D. Thelen, A. N. Kravchenko, D. R. Mutch, and M. Ngouajio Corn and Cover Crop Response to Corn Density in an Interseeding System Agron. J., June 16, 2008; 100(4): 981 - 987. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. E. Clay, K.-I. Kim, J. Chang, S. A. Clay, and K. Dalsted Characterizing Water and Nitrogen Stress in Corn Using Remote Sensing Agron. J., April 11, 2006; 98(3): 579 - 587. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. S. Snapp, S. M. Swinton, R. Labarta, D. Mutch, J. R. Black, R. Leep, J. Nyiraneza, and K. O'Neil Evaluating Cover Crops for Benefits, Costs and Performance within Cropping System Niches Agron. J., January 1, 2005; 97(1): 322 - 332. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. E. Clay, S. A. Clay, J. Jackson, K. Dalsted, C. Reese, Z. Liu, D. D. Malo, and C. G. Carlson Carbon-13 Discrimination Can be Used to Evaluate Soybean Yield Variability Agron. J., March 1, 2003; 95(2): 430 - 435. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Crop Science | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
