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Weed control in corn and weed sample size for growth evaluations
- Source :
- Planta Daninha, Vol 32, Iss 1, Pp 51-59 (2014)
- Publication Year :
- 2014
- Publisher :
- Sociedade Brasileira da Ciência das Plantas Daninhas, 2014.
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Abstract
- The objectives of this study were to evaluate baby corn yield, green corn yield, and grain yield in corn cultivar BM 3061, with weed control achieved via a combination of hoeing and intercropping with gliricidia, and determine how sample size influences weed growth evaluation accuracy. A randomized block design with ten replicates was used. The cultivar was submitted to the following treatments: A = hoeings at 20 and 40 days after corn sowing (DACS), B = hoeing at 20 DACS + gliricidia sowing after hoeing, C = gliricidia sowing together with corn sowing + hoeing at 40 DACS, D = gliricidia sowing together with corn sowing, and E = no hoeing. Gliricidia was sown at a density of 30 viable seeds m-2. After harvesting the mature ears, the area of each plot was divided into eight sampling units measuring 1.2 m² each to evaluate weed growth (above-ground dry biomass). Treatment A provided the highest baby corn, green corn, and grain yields. Treatment B did not differ from treatment A with respect to the yield values for the three products, and was equivalent to treatment C for green corn yield, but was superior to C with regard to baby corn weight and grain yield. Treatments D and E provided similar yields and were inferior to the other treatments. Therefore, treatment B is a promising one. The relation between coefficient of experimental variation (CV) and sample size (S) to evaluate growth of the above-ground part of the weeds was given by the equation CV = 37.57 S-0.15, i.e., CV decreased as S increased. The optimal sample size indicated by this equation was 4.3 m².
Details
- Language :
- English, Spanish; Castilian, Portuguese
- ISSN :
- 01008358
- Volume :
- 32
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Planta Daninha
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7051419fbc434715af71302e08b064fa
- Document Type :
- article
- Full Text :
- https://doi.org/10.1590/S0100-83582014000100006