Irradiance and Nitrogen to Potassium Ratio Influences Sweetpotato Yield in Nutrient Film Technique

Mortley, Desmond G.; Bonsi, C.K.; Hill, Walter A.; Loretan, P. A.; Morris, C. E.

doi:10.2135/cropsci1993.0011183x003300040030x

Cited by 12 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decline in nutrient solution pH is striking but not unusual for potatoes in hydroponics. This phenomenon has been observed in a previous study (Chang et al, 2000), but not when the sole source of N is in the nitrate form (Mortley et al, 1993). The presence of N in the ammonium form indicates that potato plants are characterized by a high cation/anion uptake ratio resulting in an efflux of H + from roots, thus lowering solution pH (Marschner, 1995).…”

Section: Changes Of Ph and Ec And Nutrient Absorptionsupporting

confidence: 58%

Growth and Yield Response of Three Aeroponically Grown Potato Cultivars (Solanum tuberosum L.) to Different Electrical Conductivities of Nutrient Solution

Chang¹,

Cho²,

Suh³

et al. 2011

Am. J. Pot Res

View full text Add to dashboard Cite

The release of two new potato (Solanum tuberosum L.) cultivars with different maturing characteristics, Haryeong and Jayoung, necessitates the development of appropriate electrical conductivity (EC) recommendations for the nutrient solutions used in hydroponic seed potato production. The two cultivars, along with the standard cultivar, Superior, were grown with four nutrient solutions differing in EC (0.6, 1.2, 1.8, and 2.4 dS m −1 ). The EC of nutrient solution did not influence photosynthetic rate (Pr) or water use efficiency (WUE) of leaves, whereas it affected total chlorophyll content, transpiration rate (Tr), and stomatal conductance (Sc) in some cultivars, highest at 0.6 dS m −1 EC for Tr and Sc, and lowest at the same EC for total chlorophyll content. The nutrient content of shoots was significantly affected by ECs of the nutrient solution. The total-N content was higher in 2.4 dS m −1 EC, whereas a lower P, Ca, and Mg content was measured in plants grown at the same EC. Plants grown with a lower EC had inhibited shoot and stolon growth and earlier tuber formation compared to those grown with higher ECs. For the 0.6 dS m −1 EC treatment, tubers were first observed on days 40, 50, and 52 for cvs. Superior, Haryeong, and Jayoung, respectively. For higher EC treatments, tubers were observed 5 to 6 days later, particularly for the new cultivars. At harvest, the number of tubers produced from Superior and Jayoung plants was not affected by EC, whereas those of Haryeong increased at 1.8 dS m −1 EC. The results suggest that potato cvs. Superior and Jayoung are able to grow at a wide range of solution EC levels, but that the new cultivar Haryeong needed optimal management of solution EC at 1.8 dS m −1 to yield higher tuber production under an aeroponic cultivation system.Resumen La liberación de dos nuevas variedades de papa (Solanum tuberosum L.) con características diferentes de maduración, Haryeong y Jayoung, requiere del desarrollo de recomendaciones apropiadas de conductividad eléctrica (EC) para las soluciones nutritivas usadas en la producción de semilla de papa hidropónica. Las dos variedades, junto con la estándar, Superior, se cultivaron con cuatro soluciones nutritivas que diferían en EC (0.6, 1.2, 1.8, y 2.4 dS m −1 . La EC de la solución nutritiva no influenció el nivel fotosintético (Pr) o la eficiencia en el uso del agua (WUE) de las hojas, mientras que sí afectó el contenido total de clorofila, el nivel de transpiración (Tr) y la conductancia estomatal (Sc) en algunas variedades, con la más alta a 0.6 dS m −1 EC para Tr y Sc, y la mas baja a la misma EC para el contenido total de clorofila. Se afectó significativamente el contenido de nutrientes en tallos por las ECs de la solución nutritiva. El contenido total de N fue más alto en 2.4 dS m −1 de EC, mientras que se detectó un contenido más bajo de P, Ca y Mg en plantas cultivadas a la misma EC. Las plantas en un EC más bajo tuvieron inhibición en el crecimiento de tallo y estolón y formación más temprana de tubérculo comparadas con aquellas que e...

show abstract

Section: Changes Of Ph and Ec And Nutrient Absorptionsupporting

confidence: 58%

Growth and Yield Response of Three Aeroponically Grown Potato Cultivars (Solanum tuberosum L.) to Different Electrical Conductivities of Nutrient Solution

Chang¹,

Cho²,

Suh³

et al. 2011

Am. J. Pot Res

View full text Add to dashboard Cite

show abstract

“…The nutrient solution pH was main-Research on growth responses of food crops under controlled environment conditions is being conducted by the National Aeronautics and Space Administration (NASA) through its Controlled Ecological Life Support Systems (CELSS) program for long-duration space missions. In ongoing studies Mortley et al, 1991aMortley et al, , 1991bMortley et al, , 1993 at Tuskegee Univ. 's NASA Center for Food Production, Processing, and Waste Management, we are evaluating hydroponic sweetpotato production using a nutrient film technique (NFT).…”

Section: Methodsmentioning

confidence: 99%

Growth Responses of Hydroponically Grown Sweetpotato Tolerant and Intolerant of a Continuous Daily Light Period

Mortley¹,

Loretan²,

Hill³

et al. 1996

HortSci

View full text Add to dashboard Cite

Two sweetpotato [Ipomoea batatas (L.) Lam] genotypes (`Georgia Jet' and the breeding clone TI-155) were grown at 12-, 15-, 18-, and 21-h light/12-, 9-, 6-, 3-h dark cycles, respectively, to evaluate their growth and elemental concentration responses to duration and amount of daily lighting. Vine cuttings (15 cm long) of both genotypes were grown in rectangular nutrient film technique channels for 120 days. Conditions were as follows: photosynthetic photon flux (PPF) mean 427 μmol·m–2·s–1, 28C day/22C night air cycle, and 70% ± 5% relative humidity. The nutrient solution used was a modified half-strength Hoagland's solution. Storage root count per plant and per unit area, yield (in grams per square meters per day), and harvest index increased, while production efficiency (in grams per mole) decreased with increased daily PPF. Stomatal conductance for both genotypes declined with increased daily PPF. Leaves were smallest for both genotypes at the 21-h light period, while storage root yield declined as leaf area index increased. Except for a linear decrease in leaf N and K with increased light period, elemental concentration was not significantly influenced.

show abstract

“…Bonsi et al (1992) grew sweetpotatoes under 24-h or 12h light periods in soilless culture and reported greater biomass production with continuous light compared with plants grown at 12-h light periods, which had fewer but larger leaves. Previous studies on the interaction of irradiance and N:K ratio on sweetpotato responses have shown that irradiance exerted a greater effect in increasing storage root yield than did N:K ratio (Mortley et al, 1993).…”

mentioning

confidence: 82%

Influence of Daily Light Period and Irradiance on Yield and Leaf Elemental Concentration of Hydroponically Grown Sweetpotato

Mortley¹,

Burrell²,

Bonsi³

et al. 2009

horts

Self Cite

View full text Add to dashboard Cite

Growth chamber experiments were conducted to evaluate the effect of irradiance and daily light period on storage root yield and leaf elemental concentration of two sweetpotato cultivars grown hydroponically by use of the nutrient film technique (NFT). Stem cuttings (15 cm) of cv. Whatley/Loretan and Georgia Jet were grown in NFT channels (0.15 × 0.15 × 1.2 m) in reach-in growth chambers under light period/irradiance combinations of 18 h: 300 μmol·m−2·s−1 or 9 h: 600 μmol·m−2·s−1 photosynthetic photon flux. Temperature was 28/22 °C light/dark with a relative humidity of 70% ± 5%. Storage root and foliage yields were greater in both cultivars exposed to a longer daily light period and lower irradiance. The main effect of cultivar indicated that storage root yield was significantly greater among plants of ‘Whatley/Loretan’ compared with that of ‘Georgia Jet’, whereas foliage yield was similar between cultivars. Leaves of plants grown under longer daily light period and lower irradiance had significantly lower concentrations of all elements, nitrogen, phosphorus, potassium, calcium, magnesium, manganese, iron, calcium, boron, and zinc, except for calcium, manganese, and boron. There were no significant differences in leaf elemental concentration between cultivars. Thus, a longer daily light and lower irradiance enhanced biomass production of sweetpotato but reduced leaf elemental concentration probably because of a “dilution” effect.

show abstract

Irradiance and Nitrogen to Potassium Ratio Influences Sweetpotato Yield in Nutrient Film Technique

Cited by 12 publications

References 0 publications

Growth and Yield Response of Three Aeroponically Grown Potato Cultivars (Solanum tuberosum L.) to Different Electrical Conductivities of Nutrient Solution

Growth and Yield Response of Three Aeroponically Grown Potato Cultivars (Solanum tuberosum L.) to Different Electrical Conductivities of Nutrient Solution

Growth Responses of Hydroponically Grown Sweetpotato Tolerant and Intolerant of a Continuous Daily Light Period

Influence of Daily Light Period and Irradiance on Yield and Leaf Elemental Concentration of Hydroponically Grown Sweetpotato

Contact Info

Product

Resources

About