Optimum In-row Distances for Potato Minituber Production

Abstract

<jats:p>Two field trials were conducted in the Dominican Republic to determine the influence of in-row distances on ‘Granola’ potato (<jats:italic>Solanum tuberosum</jats:italic>) minituber yield and economic returns. Seedlings generated from in vitro microtubers were transplanted in open-field raised beds at in-row distances of 0.20, 0.25, 0.30, 0.35, and 0.40 m to compare their minituber yield. In-row distances affected potato minituber weight and number per hectare and per plant. Increasing in-row distances from 0.20 to 0.40 m produced a significant decline on minituber weight per hectare (from 12.6 to 8.7 t·ha<jats:sup>−1</jats:sup>, respectively). Minituber weight per plant increased linearly with in-row distances, improving from 195 g/plant at 0.20 m to 269 g/plant at 0.40 m. Minituber number per hectare declined linearly as in-row distances increased from 0.20 to 0.40 m, with values ranging between 425,000 and 119,000 minitubers/ha. Maximum values for the number of minitubers per plant were found with 0.20 and 0.25 m, with an average of 6.5 minitubers/plant. However, as distances between plants increased to 0.30 m or farther, the average values decreased to 5 minitubers/plant or less. The results demonstrated that the in-row distances of 0.20 and 0.25 m between plants were the most appropriate from the horticultural standpoint. However, the partial budget analysis reflected that the 0.25 m spacing had the highest marginal return rate among the treatments.</jats:p>

Influence of Plant Density and Genotype on Potato Minituber Production from Microshoots and Microtubers

“…The high minituber size at low planting density may be due to the reduced competition among plants for nutrients and water and the observed increase in vegetative growth under low density plantation which in turn could increase photo-assimilate partitioning into tubers. These results agree with those of Santos and Rodriguez (2008) and; Dimante and Gaile, (2016) who obtained more minituber yields and numbers at high plantlet density. It was also reported by Van der Veeken and Lommen, (2009) that low density planting of in vitro plantlets increased tuber number and shoot branching, while high density reduced the time for minituber formation, which may positively affect total yield by the time of harvest.…”

“…In recent report, (Sharma et al, 2014) found that planting at density of 150 microtubers/m 2 gave more number of minitubers than at 66 microtubers/m 2 , and minituber size was higher at lower planting density. Santos and Rodriguez (2008) suggested that plant density variations could affect above and below ground biomass accumulation, and subsequently tuber number and yield.…”

Tuber Size Effects on Yield and Number of Potato Minitubers of Commercial Varieties in a Greenhouse Production System

“…The most suitable row line distances were recommended as 20 and 25 cm intervals. In our study, Mt weight per plant and number of Mts per hectare were obtained higher comparing to Santos and Rodriguez (2008). For the values of Mt number per plant were similar to Santos and Rodriguez (2008).…”

“…In many cases all these applications and factors may interact; therefore, when one of them is changed, other yield parameters can be changed (Dimante and Gaile, 2014;Sharma and Pandey, 2013). Santos and Rodriguez (2008) were evaluated the yield of Mts by planting the germinated microtubers in 20, 25, 30, 35 and 40 cm rows in open field. Mt weight per plant was 195 g and 269 plant -1 at 20 cm and 40 cm, respectively.…”

Sera Koşullarında İleri Patates Hatları ve Çeşitlerinin Mini Yumru Performanslarının Belirlenmesi

“…Bitki başına mini yumru sayısı ise 20 ve 25 cm sıra üzeri mesafelerde 6.5 adet ortalama ile en yüksek bulunmuş ve en uygun sıra üzeri mesafeler bu aralıklar olarak tavsiye edilmiştir. Araştırmada sera koşullarında Santos and Rodriguez (2008)'e göre dekardan daha yüksek mini yumru sayısı ve bitki başına mini yumru sayısı elde edilmiştir.…”