Title page for ETD etd-10152008-150128


Type of Document Master's Thesis
Author Weeks, Jr., James Michael
Author's Email Address jmweeks@vt.edu
URN etd-10152008-150128
Title Perennial Grass Based Crop Rotations in Virginia: Effects on Soil Quality, Disease Incidence, and Cotton and Peanut Growth.
Degree Master of Science
Department Crop and Soil Environmental Sciences
Advisory Committee
Advisor Name Title
Faircloth, Joel C. Committee Chair
Alley, Marcus M. Committee Co-Chair
Phipps, Patrick M. Committee Member
Teutsch, Christopher D. Committee Member
Keywords
  • crop rotation
  • soilborne pathogens
  • soil quality
  • perennial grass
  • peanut
  • cotton
Date of Defense 2008-04-24
Availability unrestricted
Abstract
In 2003 eight peanut and cotton crop rotations were established in southeastern Virginia,

4 of which included 2 or 3 years of tall fescue or orchardgrass grown as high-value hay crops.

Each crop rotation was evaluated for changes in soil quality indicators including soil carbon and

nitrogen, water stable soil aggregates, plant available water content, bulk density, cone index

values, and soil moisture. Cotton and peanut growth and yield were also observed to evaluate

changes in crop growth associated with differences in soil quality. Soilborne plant pathogens including root-knot nematode, stubby root nematode, ring nematode, stunt nematode, and

Cylindrocladium parasiticum microsclerotia were measured in the spring and fall of each year to

determine differences associated with crop rotations. Water stable soil aggregates in 2007 were higher in rotations with 3 years of either perennial grass. Soil moisture tended to be the highest at depths 30 - 60 cm in the 3-year tall fescue rotation in August and September 2007. Cotton in 2006 and peanut in 2007 had higher growth and yield where the annual crop directly followed a perennial grass. Root-knot nematode tended to decrease in all rotations over time. Stubby root nematode populations tended to increase in rotations with either duration of orchardgrass. Including perennial grasses in cotton and peanut rotations has the potential to increase growth and yield as demonstrated in this research.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  JamesWeeksETD.pdf 927.97 Kb 00:04:17 00:02:12 00:01:55 00:00:57 00:00:04

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.