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| 1 | Effects of environment lighting on the growth,photosynthesis,and quality of hydroponic lettuce in a plant factory显示文摘Leafy vegetable production under controlled environment using artificial lighting has many advantages over conventional greenhouses and open-field production.However,high initial investment and operation costs are restricting the wide application of this technology.In order to design an optimal artificial lighting environment for lettuce production,effects of different combinations of light intensity,photoperiod,and light quality on growth,quality,photosynthesis,and energy use efficiency of lettuce(Lactuca sativa L.cv Ziwei)were investigated under a closed plant factory.Lettuce transplants were grown under photosynthetic photon flux density(PPFD)at 150μmol/m^(2)·s,200μmol/m^(2)·s,250μmol/m^(2)·s,and 300μmol/m^(2)·s provided by fluorescent lamps(FL)with a red to blue ratio(R:B ratio)of 1.8 and light-emitting diode(LED)lamps with R:B ratio of 1.2 and 2.2,in combination with photoperiod of 12 and 16 h/d.In order to examine the“long term”photosynthetic characteristics,net photosynthetic rates of hydroponic lettuce leaves were continuously measured for 2 d(15^(th) and 16^(th) day after transplanting)before harvest.There was no difference in leaf fresh weight(FW)between PPFD of 250μmol/m^(2)·s and 300μmol/m^(2)·s with photoperiod of 16 h/d,regardless of light quality,and same results showed in contents of nitrate,soluble sugar,and vitamin C,respectively.The results of continuous measurements of net photosynthetic rate of lettuce leaves before harvest indicated that plants grown at PPFD of 250μmol/m^(2)·s had consistently higher compared to those grown at PPFD of 300μmol/m^(2)·s.Combining the results from growth,photosynthesis,quality,and energy consumption,it can be concluded that PPFD at 250μmol/m^(2)·s with photoperiod of 16 h/d under LED with R:B ratio of 2.2 is a suitable light environment for maximum growth and high quality of commercial lettuce(cv.Ziwei)production under indoor controlled environment. | Xin Zhang Dongxian He Genhua Niu Zhengnan Yan Jinxiu Song | 2018 | International Journal of Agricultural and Biological Engineering2018，11，2： | 8 |
| 2 | Growth,nutritional quality,and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs显示文摘Red plus blue light-emitting diodes(LEDs)are commonly applied in plant factories with artificial lighting due to photosynthetic pigments,which absorb strongly in red and blue light regions of the spectrum.However,plants grown under natural environment are used to utilizing broad-wide spectrum by long-term evolution.In order to examine the effects of addition light added in red plus blue LEDs or white LEDs,green and purple leaf lettuces(Lactuca sativa L.cv.Lvdie and Ziya)were hydroponically cultivated for 20 days under white LEDs,white plus red LEDs,red plus blue LEDs,and red plus blue LEDs supplemented with ultraviolet,green or far-red light,respectively.The results indicated that the addition of far-red light in red plus blue LEDs increased leaf fresh and dry weights of green leaf lettuce by 28%and 34%,respectively.Addition of ultraviolet light did not induce any differences in growth and energy use efficiency in both lettuce cultivars,while supplementing green light with red plus blue LEDs reduced the vitamin C content of green leaf lettuce by 44%and anthocyanin content of purple leaf lettuce by 30%compared with red plus blue LEDs,respectively.Spectral absorbencies of purple leaf lettuce grown under red plus blue LEDs supplemented with green light were lower in green light region compared with those grown under red plus blue LEDs,which was associated with anthocyanin contents.White plus red LEDs significantly increased leaf fresh and dry weights of purple leaf lettuce by 25%,and no significant differences were observed in vitamin C and nitrate contents compared with white LEDs.Fresh weight,light and electrical energy use efficiencies of hydroponic green and purple leaf lettuces grown under white plus red LEDs were higher or no significant differences compared with those grown under red plus blue LEDs.In conclusion,white plus red LEDs were suggested to substitute for red plus blue LEDs in hydroponic lettuce(cv.Lvdie and Ziya)production in plant factories with artificial lighting. | Zhengnan Yan Dongxian He Genhua Niu Qing Zhou Yinghua Qu | 2020 | International Journal of Agricultural and Biological Engineering2020，13，2： | 4 |
| 3 | Effects of short light/dark cycles on photosynthetic pathway switching and growth of medicinal Dendrobium officinale in aeroponic cultivation显示文摘Dendrobium officinale has high medicinal value but grows slowly in natural environment due to its special CAM photosynthetic pathway.In this study,D.officinale were grown aeroponically with light/dark cycles of 12 h/12 h,4 h/4 h,and 2 h/2 h for 150 d.The photosynthetic electron transfer characteristics,photosynthetic CO_(2) fixation pathways,and accumulations of biomass and soluble polysaccharides in D.officinale leaves were studied.The results showed that the photosynthetic apparatus states of D.officinale in aeroponic cultivation under short light/dark cycles of 4 h/4 h and 2 h/2 h were better than that under 12 h/12 h.The dark net CO_(2) exchange percentages of D.officinale were negative in short light/dark cycles of 4 h/4 h and 2 h/2 h,and the daily net CO_(2) exchange amount and dry/fresh weight increases were doubled compared with those in 12 h/12 h light/dark cycle.High soluble polysaccharides content and the soluble polysaccharides yield of D.officinale were obtained in the shorter light/dark cycle of 2 h/2 h.Therefore,the photosynthetic pathway of D.officinale could be switched from CAM to C3 by short light/dark cycles of 4 h/4 h and 2 h/2 h,and its higher biomass accumulation and soluble polysaccharides yield could be obtained by the shorter light/dark cycle of 2 h/2 h in aeroponic cultivation. | Yongsan Cheng Dongxian He Jie He Genhua Niu Fang Ji | 2019 | International Journal of Agricultural and Biological Engineering2019，12，5： | 2 |
| 4 | Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber显示文摘 | Ming Li Toyoki Kozai Genhua Niu Michiko Takagaki | 2012 | Biosystems Engineering2012，，1： | 2 |
| 5 | Seedling Emergence,Growth,and Mineral Nutrition of Ornamental Chile Peppers Irrigated with Saline Water显示文摘 | Niu Genhua Osuna P Sun Youping | 2012 | HortScience2012，47，11： | 1 |
| 6 | Inaugural Editorial:Technology in Horticulture显示文摘Applied horticultural sciences and technologies address the most burning issues faced by our generation today.Our efforts to reduce planetary carbon emissions depend upon our ability to not only optimize horticultural production yields,but also eliminate the waste of horticultural products and derivatives which,in some cases,surpass half of what is produced.A lower incidence of chronic diseases and an overall higher quality of life have also been associated with the higher consumption of fruits,vegetables,herbs,and access to cut flowers and ornamentals.However,the consumption rate of fresh produce and access to overall horticultural commodities worldwide is unequal and generally deficient.These examples remind us that the production and handling of horticultural crops carry paramount social(health),economic,and environmental impacts. | Jorge M.Fonseca Genhua Niu | 2021 | Technology in Horticulture2021，1，1： | 0 |
| 7 | 远红光有效促进罗勒植株的生物量和叶片花青素、总酚及类黄酮的积累显示文摘为了明确远红光代替部分光合有效辐射对植株生物量和叶片花青素、总酚及类黄酮含量的影响,以绿叶罗勒为研究对象,在人工光型植物工厂内保持总光量子通量密度为230μmol·m^(-2)·s^(-1)、光周期16 h/8 h(昼/夜)的条件下,测定远红光代替部分光合有效辐射对绿叶罗勒植株光合、形态、生物量和叶片花青素、总酚及类黄酮含量的影响。结果表明,与对照相比,远红光处理的绿叶罗勒植株地上部鲜质量和干质量分别提高了6%~23%和4%~28%,株高和开展度分别提高了49%~65%和10%~17%。远红光处理显著提高了部分光源下的罗勒叶片和整株的花青素、总酚和类黄酮含量,叶片的抗氧化活性显著提高了21%~44%,对植株的净光合速率和叶面积无显著影响。 | 窦海杰 Genhua Niu Mengmeng Gu Joseph Masabni | 2022 | 中国蔬菜2022，，5： | 0 |
| 8 | Effects of organic fertilizer with or without a microbial inoculant on the growth and quality of lettuce in an NFT hydroponic system显示文摘Organic food continues to increase in popularity worldwide.Similarly,hydroponic production of leafy greens is expanding globally and is an important component of the world's food supply.The purpose of this study was to evaluate the growth and quality of lettuce using six nutrient film technique(NFT)hydroponic systems.There were three treatments:organic fertilizer with or without a microbial inoculant and a conventional inorganic fertilizer as a control.The experiment was repeated over time.Results showed that the plants grown with organic fertilizer with additional microbial inoculant achieved similar shoot fresh and dry weight to those of the control,and dry weight was 17%higher than the organic fertilizer without inoculant.Nitrogen content in the shoot tissue of plants treated with organic fertilizer with inoculant was 10%and 24%greater than the control and the organic fertilizer without inoculant,respectively.However,when the organic fertilizer with inoculant was reused in a second experiment,shoot fresh and dry weight of plants in organic fertilizer with inoculant was lower than those in the control but were still higher compared to the organic fertilizer without inoculant.Additionally,electrical conductivity(EC)and pH of the organic fertilizer solutions fluctuated widely.Interestingly,relative chlorophyll content measured as SPAD and anthocyanin content in the leaf tissue increased in plants treated with organic fertilizer,regardless of inoculant,by 19%and 9%,respectively. | Triston Hooks Joseph Masabni Ling Sun Genhua Niu | 2022 | Technology in Horticulture2022，2，1： | 0 |
| 9 | Salt tolerance of seven genotypes of zoysiagrass(Zoysia spp.)显示文摘Seven zoysiagrass genotypes were evaluated for salt tolerance in a greenhouse study.The plant materials included Zoysia matrella'Diamond',Z.japonica'Palisades',three Z.matrella×Z.japonica hybrids DALZ 1701,DALZ 1713,and'Innovation',and two Z.minima×Z.matrella hybrids(DALZ 1309 and'Lazer').Treatments included a control(nutrient solution)and two saline treatments representing moderate and high salt levels.The electrical conductivity(EC)was 1.3 dS m−1 for control and moderate(EC5)and high salinity(EC10)were 5.0 and 10.0 dS m−1,respectively.At the end of eight-weeks of treatment,the relative(percent control)shoot dry weight(DW)was greatest in'Diamond'in EC10,and the relative root DW was greatest in DALZ 1309 in EC5.A cluster analysis based on the relative tissue dry weight identified'Diamond',DALZ 1309,and DALZ 1713 as the most salt tolerant genotypes.Additionally,the green leaf area(GLA)index of'Diamond'and DALZ 1713 were 98.8%and 100%,respectively,indicating excellent visual appearance under high salt levels.Bi-weekly clipping DW showed that'Diamond'continued to produce biomass throughout the duration of the study under the EC10 treatment.Sodium(Na^(+))and chloride(Cl−)content in the shoot tissue of the seven turfgrass genotypes indicated that lower concentrations corresponded to greater salt tolerance indicating exclusion of Na+and Cl−from the shoot tissue.Taken together,the genotypes'Diamond'and DALZ 1713 were determined to be the most salt tolerant and recommended for use in areas with high soil or water salinity. | Triston Hooks Joseph Masabni Girisha Ganjegunte Ling Sun Ambika Chandra Genhua Niu | 2022 | Technology in Horticulture2022，2，1： | 0 |
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