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668031 
Journal Article 
Allelopathy in black walnut (Juglans nigra L.) alley cropping. I. Spatio-temporal variation in soil juglone in a black walnut-corn (Zea mays L.) alley cropping system in the midwestern USA 
Jose, S; Gillespie, AR 
1998 
1 
Plant and Soil
ISSN: 0032-079X
EISSN: 1573-5036 
203 
2 
191-197 
BIOSIS COPYRIGHT: BIOL ABS. A study was conducted to quantify the spatial and temporal variation in soil juglone (5-hydroxy-1,4-naphthoquinone) in a 10-year-old black walnut (Juglans nigra L.)-com (Zea mays L.) alley cropping system. Two treatments ('root barrier' and 'no barrier') were applied to determine if soil juglone in the alley can be minimized by preventing black walnut root growth into the alley. Although no significant seasonal variation in soil juglone existed, a distinct spatial pattern Was observed. Juglone concentration decreased as much as 80% as the distance increased to 4.25 m from the tree row. Installation of polyethylene root barriers minimized juglone concentration to trace levels in the alley. However, this treatment increased juglone levels within the tree row as compared to the 'no barrier' treatment, probably as a result of increased rooting density within a limited volume of soil. 
Ecology; Plants; Poisoning; Animals; laboratory; Cereals; Plants growth & development; Soil; Climate; Fruit; Nuts; Environmental pollution; Plant diseases; Weather; Grasses; 481-39-0