INFLUENCE OF PHOSPHORUS FERTILITY REGIMES AND COMMON LAMBSQUARTERS fChenopodium album) DENSITIES ON LETTUCE (Lactuca sntiva) YIELDS

B. M. Santos, J. P. Morales-Payan, J. A. Dusky and W. M. Stall

No 256980, 33rd Annual Meeting, July 6-12, 1997, Isabela, Puerto Rico from Caribbean Food Crops Society

Abstract: Field trial were conducted in low-phosphorus (P) organic soils to determine the influence of two Ρ fertility regimes and five lambsquarters population densities on lettuce marketable yields. Phosphorus was either banded (125 Kg P/ha) or broadcast (250 Kg P/ha) prior to lettuce planting. Lambsquarters population densities of 0, 2, 4, 8 or 16 plants per 5.4 m2 were allowed to interfere with "South Bay" lettuce within each Ρ regime. Marketable lettuce yield and head number were collected 8 weeks after lettuce emergence. Results indicate that banding Ρ can reduce the negative impact of lambsquarters on lettuce. In all cases, lettuce yields increased approximately 13% when Ρ was banded. At the same time, when Ρ was banded no differences were observed between 2 lambsquarters per 5.4 m* and the weed-free control. However, when Ρ was broadcast, 2, 4, and 8 lambsquarters per 5.4 m2 were enough to reduce lettuce marketable yield in about 33, 50 and 65%, respectively. No significant differences were observed between 8 and 16 lambsquarters per 5.4 m2 when Ρ was broadcast. Maximum lettuce yield reductions occurred at either 4, 8, or 16 lambsquarters per 5.4 mJ when Ρ was banded, corresponding to approximately 34%.

Keywords: Crop Production/Industries; Farm Management; Land Economics/Use (search for similar items in EconPapers)
Pages: 5
Date: 1997-07-06
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs97:256980

DOI: 10.22004/ag.econ.256980

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