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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 | Effects of light quality on growth and development of cucumber seedlings in controlled environment显示文摘Conventional light sources have been successfully used to cultivate a wide variety of horticultural crops.However,they are of limited use due to uncontrollability of spectra and energy inefficiency.Light-emitting diodes(LEDs)emerged with tremendous potential in controlled environment agriculture due to their energy efficiency,longevity,and spectral specificity,but the effects of different types of LEDs on plant growth and development must be examined.In this study,cucumber(Cucumis sativus L.cv.Zhongnong 26)seedlings were grown under four different lighting treatments that each delivered a photosynthetic photon flux density of 200μmol/m2·s at plant canopy including triphosphate fluorescent lamps(TF),high-frequency fluorescent lamps(HF),white LEDs(WL),and red and blue LEDs(RBL).Cucumber seedlings were grown in a growth chamber at(25.0±1.5)℃with 12-hour light and 12-hour dark for 30 days after sowing,and data were subsequently collected.Seedlings grown under the WL were 45%,12%,and 40%taller than those grown under the TF,HF and RBL,respectively.The leaf area was 23%smaller under the TF than under the HF.The shoot dry weight was 16%-22%lower under the TF than under the other lighting treatments.The transplants grown under the RBL had the lowest root dry weight and root to shoot ratio.The seedling quality index was similar among all the lighting treatments.The LEDs treatment yielded more total dry weight with unit electric power compared to the fluorescent lamps.The chlorophyll content was 13%-15%higher in plants grown under the HF and WL than that under the TF and RBL.Plants grown under the WL and RBL had greater photosynthetic rate,transpiration rate,and stomatal conductance than those grown under the TF and HF.It was concluded that high quality cucumber seedlings can be efficiently produced under the broad-spectrum WL that emit a reasonable amount of blue,green and red light,and the lack of green light and/or high ratio of red to blue light under the RBL may cause undesired plant attributes. | Song Jinxiu Meng Qingwu Du Weifen He Dongxian | 2017 | International Journal of Agricultural and Biological Engineering2017，10，3： | 4 |
| 3 | 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 |
| 4 | Effects of LED light quality on the growth of pepper seedling in plant factory显示文摘The extensive environment,especially low temperature and weak lighting in winter and spring,which limits the growth of pepper(Capicum annuum L.)seedlings,the use of plant factory with artificial lighting technology can effectively control the lighting environment to produce high-quality seedlings.In this study,white LED lamps with R:B ratio of 0.7(L0.7)and 1.5(L1.5)and red-blue LED lamps with R:B ratio of 3.5(L3.5)were used to cultivate seedlings of“CAU-24”pepper in the light intensity of 250μmol/m^(2)·s and photoperiod of 12 h/d,white fluorescent lamps with R:B ratio of 1.7(F1.7)was used as control.The results showed that plant height,stem diameter,hypocotyl length,biomass accumulation,light energy use efficiency(LUE)and electric energy use efficiency(EUE)of pepper seedling under L1.5 were the highest.After 36 days of sowing,the dry weight of shoot reached 302.8±45.2 mg/plant.Leaf area reached maximum value of 153.5±22.0 cm^(2) under L0.7.The contents of chlorophyll a,chlorophyll b and total chlorophyll of pepper seedling leaves under all kinds of LED light were greater than F1.7,but there was no significant difference in net photosynthetic rate.The total dry weight with lamp electric power consumption of L1.5 were 3.0 g/(kW·h)which was 1.5,2,and 3 times greater than that of L3.5,L0.7,and F1.7,respectively.Therefore,compared with fluorescent lamp and other LED lamps,the white LED light quality with R:B ratio of 1.5 is suitable for pepper seedling production in plant factory because of the high LED lighting efficiency,greater LUE and EUE. | Nan Liu Fang Ji Lijun Xu Dongxian He | 2019 | International Journal of Agricultural and Biological Engineering2019，12，5： | 3 |
| 5 | Effects of light intensity and photoperiod on runner plant propagation of hydroponic strawberry transplants under LED lighting显示文摘Vegetative propagation of strawberry(Fragaria×ananassa Duch.)in the plant factory with artificial lighting is considered as an effective approach to produce high-quality transplants.In this study,mother plants of‘Benihoppe’strawberry were grown hydroponically for 50 d under eight LED lighting treatments by combining four levels of light intensity(200,250,300 and 350mmol/(m^(2)·s))and two photoperiods(12 h/d and 16 h/d).Runner development,growth of runner plants,photon yield and energy yield in runners and runner plants were investigated to evaluate the strawberry propagation efficiency.Results indicated that length of runners decreased linearly with increasing daily light integral(DLI)under each photoperiod and was significantly shorter under photoperiod of 16 h/d.Runner elongation was inhibited by high DLI.Number of runners and runner plants formed by mother plants increased by 38.9%and 33.7%,when DLI increased from 8.6 to 11.5 mol/(m^(2)·d),respectively;however,no further increase was observed when DLI was higher than 11.5 mol/(m^(2)·d).Similar trends were found in crown diameter and biomass of primary and secondary runner plants.Negative impact of high DLI(20.2 mol/(m^(2)·d))on photosynthetic capacity of runner plants was observed as a decrease in leaf net photosynthetic rate,potential maximum photochemical efficiency of PSII,and chlorophyll content.Furthermore,photon yield and energy yield in runners and runner plants decreased significantly with increasing DLI.Therefore,DLI in a range of 11.5-17.3 mol/(m^(2)·d)is beneficial to improve strawberry propagation efficiency and quality of runner plants,and 11.5 mol/(m^(2)·d)is optimal for the strawberry propagation of runner plants in the LED plant factory because of the higher photon and energy yields. | Jianfeng Zheng Dongxian He Fang Ji | 2019 | International Journal of Agricultural and Biological Engineering2019，12，6： | 3 |
| 6 | 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 |
| 7 | Non-destructive measurement of chlorophyll in tomato leaves using spectral transmittance显示文摘In this study,spectral transmittances were measured in the wavelength range from 300 nm to 1100 nm of tomato leaves with different chlorophyll contents and compositions,and the correlations between the spectral transmittances and the contents of chlorophyll a,chlorophyll b and total chlorophyll were analyzed.With the characteristic wavelengths of 560 nm,650 nm,720 nm and the reference wavelength of 940 nm,nine sets of characteristic spectral parameters were obtained.According to the results of correlation analysis and regression model exploration,characteristic spectral parameters of T940/T560,T940/T650 and log(T940/T560)among the nine sets of parameters were highly correlated to the estimated contents of chlorophyll a,chlorophyll b and total chlorophyll of tomato leaves.The relative errors of total chlorophyll and chlorophyll a/b ratio were(5.1±3.7)%and(4.9±4.3)%,respectively.Therefore,the above three characteristic spectral parameters could be applied in the rapid non-destructive estimation of the contents of chlorophyll a,chlorophyll b and total chlorophyll as well as chlorophyll a/b ratio of tomato leaves. | Wang Jianfeng He Dongxian Song Jinxiu Dou Haijie Du Weifen | 2015 | International Journal of Agricultural and Biological Engineering2015，8，5： | 1 |
| 8 | A remote wireless system for water quality online monitoring in intensive fish culture显示文摘 | Xiuna Zhu Daoliang Li Dongxian He Jianqin Wang Daokun Ma Feifei Li | 2009 | Computers and Electronics in Agriculture2009，，： | 1 |
| 9 | Agricultural remote monitoring systems based on web-server-embeded technology and CDMA service显示文摘 | He Dongxian Bai Youlu Yang Po | | 0，，50： | 1 |
| 10 | A photosynthesis continuous monitoring system for CAM plants显示文摘Diurnal CO_(2) exchanges in crassulacean acid metabolism(CAM)plants are significantly different from those in C3 and C4 plants.The instantaneous short-time CO_(2) exchange of a single leaf measured by commercial portable photosynthesis measuring systems with a small leaf chamber cannot reflect the plant photosynthetic capacity for CAM plants because of the CO_(2) fixation property.Therefore,a photosynthesis continuous monitoring system with two canopy cuvettes was developed for measuring diurnal net CO_(2) exchange rates for CAM plants.To evaluate stability and applicability of the photosynthesis continuous monitoring system,continuous measurement of net CO_(2) exchange rates of plants with different photosynthetic pathways were conducted.An obligate CAM plant(Kalanchoe daigremontiana),four facultative CAM plants(Dendrobium officinale,D.chrysotoxum,D.nobile,and D.primulinum),a C3 plant(Strawberry,Fragaria ananassa),and a C4 plant(Corn,Zea mays)were selected as model plants.K.daigremontiana had a significant CO_(2) absorption during the dark period and its net CO_(2) exchange rates fluctuated around 0μmol/(m^(2)·s)during the photoperiod in a growth chamber.Net CO_(2) exchange rates of F.ananassa and Z.mays in a greenhouse gradually increased after sunrise,reaching a maximum at about 12:00,and then gradually decreased to negative values during the night time.It is interesting to observe that D.officinale in the greenhouse and growth chamber absorbed CO_(2) during both day and night times.The photosynthetic pathways of D.chrysotoxum,D.nobile,and D.primulinum were also well distinguished by this photosynthesis continuous monitoring system.The results showed that the photosynthesis continuous monitoring system is capable for quantitative evaluation of diurnal net CO_(2) exchange characteristics not only in the CAM plants but also in small size C3 and C4 plants with low net photosynthetic rates for long-time and high-accuracy measurements. | Yongsan Cheng Dongxian He | 2019 | International Journal of Agricultural and Biological Engineering2019，12，3： | 1 |
| 11 | Agricultural remote moni- toring systems based on web server embedded technology and CDMA service显示文摘 | Dongxian He Youlu Bai Po Yang | 2008 | New Zealand Journal of Agricultural Re- search2008，，50： | 1 |
| 12 | Estimating EC and ionic EC contribution percentage of nutrient solution based on ionic activity显示文摘The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high price.Due to the difficulty of dynamic control based on ionic concentration of nutrient solution,EC and pH values of nutrient solution are often used as feedback control indexes in hydroponic system.In this study,estimation algorisms of EC and ionic EC contribution percentage based on ionic activity were proposed to understand the quantitative relationship between ionic concentration and EC.With a view to predicting the EC accurately by mean ionic activities of specific salts in nutrient solution based on a specific formula,ionic concentration could also be calculated by the actual measurement of EC combined with ionic EC contribution percentage.With Japanese horticultural experimental nutrient formula and Yamasaki tomato nutrient formula,significant linear correlations between estimated EC and measured EC were found with determination coefficients over 0.99.Ionic EC contribution percentage was not affected by different relative concentrations of nutrient solutions.However,ionic EC contribution percentage changed significantly when adding specific salts with different concentrations,and different changes were found in each anions and cations of specific salt added.When the same K+concentration was added in different forms of KNO_(3),K_(2_SO_(4),KCl,and KH_(2)PO_(4),the changes of ionic EC contribution percentage of K^(+)were similar,but those of other anions in potassium salts varied greatly.The relative errors of estimated EC of nutrient solutions based on ionic activities were only 1.3%in horticultural experimental nutrient solution and 1.8%in Yamasaki tomato nutrient solution with different relative concentrations compared to measured EC.The relative errors of estimated EC of nutrient solutions with specific salt added were only 0.1%-0.5%compared to measured EC in two nutrient solution.Therefore,the dynamic feedback control of ionic concentration of nutrient solution could be realized by using EC measurement combined with ionic EC contribution percentage to improve the ionic quantitative control in nutrient solution.The EC control of nutrient solution in automatic irrigation system might be upgraded to ionic concentration control by using algorisms above of ionic EC contribution percentage and EC estimation to meet dynamic demands of hydroponic crops for ionic concentration in different growth stages. | Jinxiu Song Lin Xu Dongxian He Satoru Tuskagoshi Toyoki Kozai Yutaka Shinohara | 2019 | International Journal of Agricultural and Biological Engineering2019，12，2： | 1 |
| 13 | Effects of light intensity and LED spectrum on the medicinal component accumulation of hydroponic Hypericum perforatum L.under controlled environments显示文摘Medicinal components of Hypericum perforatum L.plants varies widely due to fluctuations in growth environment and biotic and abiotic contamination during cultivation management.The quality of extracts or preparations is difficult to control because of the unstable raw materials.The aim of this study is to enhance the yield and medicinal component contents of H.perforatum by optimizing lighting factors under controlled environment.H.perforatum plants were hydroponically cultivated for 30 d under 3 levels of photosynthetic photon flux density(PPFD)with 200,300,and 400μmol/(m^(2)·s)using white LEDs(R:B ratio is the ratio of red light to blue light,R:B ratio of 0.9 and 1.8)and white plus red LED(R:B ratio of 2.7).The results showed that PPFD and LED spectrum had significant effects on the growth and accumulation of medicinal components of H.perforatum.Biomass accumulation of stem,leaf,and root increased linearly with the increase of PPFD under each LED spectrum.Fresh weights and dry weights of stem,leaf,and root were significantly higher under a PPFD of 400μmol/(m^(2)·s)with R:B ratio of 0.9 than those of 200μmol/(m^(2)·s),respectively.The relative growth rate and net photosynthetic rate showed linear relationships with PPFD under the same LED spectrum.Total hypericin content,total hyperforin content,and energy yield of hypericin increased with increasing PPFD.Total hypericin content and energy yield of hypericin of P400-L0.9 were 78%and 89%more than those of P400-L2.7,respectively.Total hyperforin content and energy yield of hyperforin of P400-L0.9 and P400-L2.7 were no significant differences.Based on energy efficiency,an R:B ratio of 0.9 of white LEDs with a PPFD of 400μmol/(m^(2)·s)was beneficial to improve medicinal component contents of hydroponic H.perforatum in plant factory with LED lighting. | Wei Gao Dongxian He Jianfeng Zheng Yan Li | 2022 | International Journal of Agricultural and Biological Engineering2022，15，5： | 0 |
| 14 | Preface to Special Issue on Novel Semiconductor-biochemical Sensors显示文摘Since 2020,the global outbreak and continued evolution of the COVID-19 pandemic have brought the concepts of nucleic acid,antigen-antibody,gene sequencing,and other biochemical testing into ordinary families.In this regard,novel semiconductor-biochemical sensors that convert biochemical information into monitorable electrical and optical signals according to specific rules have become increasingly important and indispensable.These sensors deeply fuse the technical advantages of semiconductors and biochemistry,integrating interdisciplinary subjects such as molecular biology,nanomaterials,microfluidics,artificial intelligence(AI),etc.With the advantages of fast speed,high sensitivity,high integration,easy mass manufacturing,the novel technologies are the'pioneer'of biomedical information acquisition and the'heart'of modern medical diagnostic equipment.Currently,the technologies are showing a spurt of development,with new products emerging,new functions being developed,and new application scenarios being expanded.The research hotspots cover a wide range,including immediate detection,non-invasive analysis,wearable devices,on-site monitoring,etc.This issue looks at the latest advances in the novel technologies for physiological dynamic monitoring of animals/plants and rapid detection of highly pathogenic pathogens,while covering applications in agriculture,fisheries,animal husbandry,biosecurity,and wearable medicine. | Zhao Li Xiangmei Lin Dongxian He Yingxin Ma Yuanjing Lin | 2023 | Journal of Semiconductors2023，44，2： | 0 |
| 15 | Effects of Low Temperature and Poor Light Environments under LED Lighting on Quality Change of Pepper Seedlings during Storage显示文摘Storage and transportation of vegetable commercial seedlings becomes an important link along with the continuous expansion of planting areas of facility vegetables and vegetable seedling culture industry. In this study,pepper variety‘Nongda 24' was as the experimental material,and changes in the morphological and physiological indicators of plug seedlings in different low temperature( 6 and 11℃) and poor light environments were studied to find suitable storage environmental conditions. The results showed that pepper seedlings could be stored and transported for 14 days when storage temperature was 11℃ and light conditions such as light intensity and photoperiod were 30 μmol/( m^2·s)and 12 h/d by using a fluorescent lamp with R∶ B ratio of 1. 9,and 15 μmol/( m^2·s) and 24 h/d by using LED with R∶ B ratio of 1. 3,respectively. Moreover,the quality of pepper seedlings could be protected effectively. Compared to the fluorescent lamp,LED with high luminous efficiency and low energy consumption was suitable for the storage or long-distance transportation of pepper seedlings in low temperature and poor light environments. | Zhengnan YAN Dongxian HE Jinxiu SONG Yongsan CHENG Weifen DU | 2018 | Asian Agricultural Research2018，10，2： | 0 |
| 16 | Optimal red:blue ratio of full spectrum LEDs for hydroponic pakchoi cultivation in plant factory显示文摘Pakchoi,a popular leafy vegetable in China,is expected to be planted in plant factories with artificial lighting(PFALs).In order to examine the effects of different red and blue light ratios(R:B ratio)on growth,photosynthesis,and absorption spectrum of plant leaves,and to analyze the energy use efficiency,the pakchoi(Brassica Chinensis L.cv.Xiazhijiao)was cultivated hydroponically under white LEDs with R:B ratios of 0.9(L0.9)and 1.8(L1.8),white plus red LEDs with R:B ratios of 2.7(L2.7)and 4.0(L4.0)for 40 d,respectively.The results showed that the leaf length and width were significantly greater in the L0.9 treatment than in other treatments,and the dry weight per plant increased by over 33%when R:B ratio decreased from 4.0 to 0.9.The net photosynthesis rates of pakchoi leaves ranged from 9.2 to 9.6μmol/(m2·s)under different lighting conditions,which had no significant difference.The biggest difference in the spectrum absorptance of pakchoi leaves was expressed in green light waveband,and the highest absorption of plant leaves was under L0.9 and L1.8 treatments.The light energy use efficiency(LUE),photon yield(PY),and energy yield(EY)in L0.9 were over 25%higher than that in the other treatments,while there was no significant difference in the electrical energy use efficiency(EUE).In conclusion,an optimal light quality to cultivate pakchoi in PFALs was the white LEDs with R:B ratio of 0.9,and this finding could provide a promising lighting environment to hydroponic pakchoi yield and energy use efficiency. | Yunong Li Nan Liu Fang Ji Dongxian He | 2022 | International Journal of Agricultural and Biological Engineering2022，15，3： | 0 |
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