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1 October 2004 Effects of Phosphorus Fertilization on the Area of Influence of Common Lambsquarters (Chenopodium album) in Lettuce
BIELINSKI M. SANTOS, JOAN A. DUSKY, WILLIAM M. STALL, JAMES P. GILREATH
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Abstract

Area-of-influence experiments were conducted on high–organic matter soils to assess the effect of common lambsquarters distances from ‘South Bay’ lettuce on yield and quality under two phosphorus (P) regimens. P was applied either banded (125 kg P/ha) or broadcast (250 kg P/ha) before lettuce planting. Lettuce plants were harvested at 0, 25, 50, 75, 100, and 125 cm from each side of the common lambsquarters plant after season-long interference. The regression equations were y = 0.40 0.36/(1 e−0.09(x−52.5)), r2 = 0.92, for banded P; and y = 0.40 0.29/(1 e−0.07(x−69.3)), r2 = 0.94 for broadcast P. Banded P produced 9% more fresh weight per head than the broadcast P treatment under weed-free conditions. Within the broadcast P treatments, common lambsquarters growing at 125 and 100 cm did not affect fresh weight of harvested lettuce. Values for fresh weight per head declined 18, 34, 38, and 38% when lettuce grew at 75, 50, 25, and 0 cm distance from common lambsquarters, respectively. Fresh weight of lettuce in banded P treatments was reduced only at 50, 25, and 0 cm distance from common lambsquarters plants, representing 31, 44, and 44% less than its weed-free control, respectively. Banding P at 50% (125 kg/ha) of the recommended broadcast rate reduced the area of influence of common lambsquarters with lettuce.

Nomenclature: Common lambsquarters, Chenopodium album L. #3 CHEAL; lettuce, Lactuca sativa L.

Additional index words: Competition, integrated weed management, interference, nutrients.

BIELINSKI M. SANTOS, JOAN A. DUSKY, WILLIAM M. STALL, and JAMES P. GILREATH "Effects of Phosphorus Fertilization on the Area of Influence of Common Lambsquarters (Chenopodium album) in Lettuce," Weed Technology 18(4), 1013-1017, (1 October 2004). https://doi.org/10.1614/WT-03-197R
Published: 1 October 2004
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