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Allelopathy of Sorghum on Wheat under Several Tillage Systems

Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506-5501 USA

View larger version (54K): [in a new window]   Fig. 1 Emergence promptness index of seven wheat cultivars after different sorghum and millet residue treatments. LSD (0.05) = 11 among cultivars and 9 among residue treatments during 1997 and 12 among cultivars and 14 among residue treatments during 1998. Within each cultivar, bars with different letters differ significantly among residue treatments at P = 0.05

View larger version (65K): [in a new window]   Fig. 2 Spike densities at maturity of seven wheat cultivars after different sorghum and millet residue treatments. LSD (0.05) = 38 among cultivars and 34 among residue treatments during 1997 and NS among cultivars and 127 among residue treatments during 1998. Within each cultivar, bars with different letters differ significantly among residue treatments at P = 0.05

View larger version (54K): [in a new window]   Fig. 3 Grain yields of seven wheat cultivars after different sorghum and millet residue treatments. LSD = 68 among cultivars and 62 among residue treatments during 1997 and 79 among cultivars and 97 among residue treatments during 1998. Within each cultivar, bars with different letters differ significantly among residue treatments at P = 0.05

View larger version (69K): [in a new window]   Fig. 4 Harvest index of seven wheat cultivars after different sorghum and millet residue treatments. LSD = 0.03 among cultivars and residue treatments during 1997 and 0.04 among cultivars and residue treatments during 1998. Within each cultivar, bars with different letters differ significantly among residue treatments at P = 0.05