In-row Plant Spacing and Date of Harvest of `Beauregard' Sweetpotato Affect Yield and Return on Investment

Abstract

<jats:p>The effects of plant spacing (15, 23, 31, and 38 cm) and date of harvest on yield and economic return of `Beauregard' sweetpotato [<jats:italic>Ipomoea batatas</jats:italic> (L.) Lam.] were studied. For comparison, `Jewel' was included at one spacing. As in-row plant spacing decreased, yield of U.S. No. 1, canners, and total marketable root production increased when plants were harvested 103 days or later after transplanting. The yield of jumbo roots generally increased with in-row spacing because of less plant-to-plant competition. Total marketable and No. 1 grade yields of `Beauregard' at the closest spacing (15 cm) were greater than those of `Jewel'. `Beauregard' roots sized more quickly than `Jewel' roots regardless of spacing. The optimal time for harvesting `Beauregard' was 100 to 110 days after transplanting, while acceptable yields could be obtained as early as 90 days after transplanting depending on market prices. Economic analysis of `Beauregard' spacing data indicated that 23 cm would be the preferred spacing if a late harvest was anticipated, while the 15-cm spacing would be best if harvested at ≈110 days after transplanting. Thus, sweetpotato growers should place `Beauregard' at an in-row spacing of 15 or 23 cm, depending on projected date of harvest, on or before 10 June, to obtain the best yields with the highest return on investment.</jats:p>

Desempenho de cultivares de batata-doce para rendimento e qualidade de raízes em Sergipe

“…Pouco conhecida no mercado nacional, mas é amplamente produzida em mercados dos Estados Unidos da América do Norte e da Europa, constituindo uma opção com o objetivo de atender possíveis demandas de exportações. Em trabalho realizado por Schultheis et al (1999) na Carolina do Norte, EUA, foi verificado que aos 90 dias já foi possível colher raízes com tamanho comercial. Estes autores obtiveram rendimentos totais variando de 25,5 a 34,9 t ha -1 para esta cultivar, aos 132 dias após o plantio.…”

Cultivar Decline in Sweetpotato: II. Impact of Virus Infection on Yield and Storage Root Quality in `Beauregard' and `Hernandez'

“…Growers who prefer adventitious propagation because of rapid increase of transplants will most likely need a cultivar that is resistant or tolerant to the U.S. potyvirus complex, which may be the case for 'Hernan-dez , but this clone suffers from other flaws. In commercial sweetpotato production in the United States, one cultivar has often dominated the industry (Schultheis et al, 1999). Currently 'Beauregard is the predominant clone grown in the United States.…”

Development of planting-density growth harvest (PGH) charts for quinoa (Chenopodium quinoa Willd.) and sowthistle (Ixeris dentata Nakai) grown hydroponically in closed-type plant production systems

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