Nutrient Management Effects on Sweetpotato Genotypes Under Controlled Environment.

David, Pauline; Bonsi, C.K.; Trotman, A. A.; Douglas, DJ

doi:10.17660/actahortic.1996.440.12

Cited by 2 publications

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“…Our data indicate that within each environment, the two solution management treat-ments evaluated in our study did not affect basil growth, development, or overall yield (Table 1). This was unexpected, as guidelines for commercial basil production typically recommend replacing the nutrient solution every 1 to 2 weeks (David et al, 1996;Jones, 2005 1978). Although optimal EC for basil production can range from 0.5 to 1.6 dS · m -1 (Dunn and Singh, 2016;Moya et al, 2014;Owen et al, 2018;Somerville et al, 2014), we found that a higher EC (up to 5.5 dS · m -1 for the W/O treatment indoors) did not affect final growth and yield of hydroponic basil grown for 8 weeks (Table 2, Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Several strategies can be implemented to manage the nutrient solution in closed hydroponic systems. One common strategy consists of replacing the entire solution after 1 (Jones, 2005;Lykas et al, 2006) or 2 weeks of use (David et al, 1996;Samarakoon et al, 2006;Spensley et al, 1978). Another strategy recommends the constant monitoring of ions, considering the different uptake rate of nutrients by plants (e.g., active, intermediate, and passive) (Bailey et al, 1988).…”

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Growth Rate and Nutrient Uptake of Basil in Small-scale Hydroponics

Solis-Toapanta¹,

Fisher²,

Gómez³

2020

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To identify practices that may simplify the use of small-scale hydroponic systems for indoor gardening, we compared two nutrient solution management treatments for basil (Ocimum basilicum) production. Experiments were conducted for 8 weeks to evaluate the effect of biweekly replacement of the nutrient solution (W) vs. biweekly fertilizer addition without nutrient solution replacement (W/O) on growth and nutrient uptake of basil ‘Genovese Compact’ grown in either a greenhouse or an indoor environment. Greenhouse day/night temperature was 29/24 ± 4 °C, relative humidity (RH) was 65 ± 4%, and daily light integral (DLI) was 26.1 mol·m‒2·d‒1. The indoor environment had a constant ambient temperature of 21 °C, RH of 65%, and DLI of 9 mol·m‒2·d‒1 provided by broadband white lamps. Four plants were grown in 7.6-L replicate hydroponic systems, with 178 mg·L‒1 N from a complete nutrient solution in two experimental runs. Shoot fresh and dry mass, leaf number, and leaf area showed an increasing quadratic trend over time when plants were grown in the greenhouse. In contrast, growth over time was linear for plants grown indoors. Within each environment, solution management treatment did not affect growth, indicating that the simpler W/O strategy was adequate under these conditions. Plants grown in the greenhouse required more frequent refill water applications compared with indoors, which resulted in three to four times more refill water applied. Because indoor-grown plants had a decreased growth rate, nutrient uptake rate, and volume of water applied compared with plants grown in the greenhouse, electrical conductivity (EC) for the W/O treatment increased over time. Final nutrient solution concentration was highest for indoor-grown plants under the W/O treatment, and final tissue nutrient concentration was higher for plants grown indoors compared with the greenhouse. Final nutrient uptake (dry mass × nutrient concentration) was higher for plants grown in the greenhouse rather than indoors. Considering that EC increased in the solution of indoor-grown plants under W/O, an appropriate strategy using this treatment would require reducing fertilizer input indoors. To refine simple and robust fertilizer management strategies for indoor gardeners, further research is needed to test variables such as different plant species, cultivars, and water qualities.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%