Type of Document Master's Thesis Author Weeks, Jr., James Michael Author's Email Address email@example.com 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
Date of Defense 2008-04-24 Availability unrestricted AbstractIn 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.
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