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

Horticulture, Environment, and Biotechnology - Tập 57 - Trang 213-218 - 2016
Mi-Kyung Cha1, Youn A. Jeon2, Jung Eek Son3, Young-Yeol Cho2,4
1Major of Plant Resources and Environment, Jeju National University, Jeju, Korea
2Research Institute for Subtropical Agriculture and Animal Biotechnology, Jeju National University, Jeju, Korea
3Department of Plant Science, Seoul National University, Seoul, Korea
4Major of Horticultural Science, Jeju National University, Jeju, Korea

Tóm tắt

When designing a plant production system, it is crucial to perform advanced estimation of growth and productivity in relation to cultivation factors. In this study, we developed Planting-density Growth Harvest (PGH) charts to facilitate the estimation of crop growth and harvest factors such as growth rate, relative growth rate, shoot fresh weight, harvesting time, marketable rate, and marketable yield for quinoa (Chenopodium quinoa Willd.) and sowthistle (Ixeris dentata Nakai). The plants were grown in a nutrient film technique (NFT) system in a closed-type plant factory under fluorescent lamps with three-band radiation under a light intensity of 140 μmol·m-2 ·s-1, with a 12-h/12-h (day/night) photoperiod. We analyzed the growth and yield of quinoa and sowthistle grown in nutrient solution at EC 2.0 dS·m-1 under four planting densities: 15 cm between rows with a within-row distance of 15 × 10 cm (67 plants/m 2), 15 × 15 cm (44 plants/m2), 15 × 20 cm (33 plants/m2), and 15 × 25 cm (27 plants/m2). Crop growth rate, relative growth rate, and lost time were closely correlated with planting density. We constructed PGH charts based on the growth data and existing models. Using these charts, growth factors could easily be determined, including growth rate, relative growth rate, and lost time, as well as harvest factors such as shoot fresh weight, marketable yield per area, and harvesting time, based on at least two parameters, for instance, planting density and shoot fresh weight.

Tài liệu tham khảo

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