Research On High Efficient Aeroponics Cultivation Techniques Of Clivia Miniata

Clivia is a genus in the Amaryllidaceae family from South Africa.People are greatly fond of its bright flower color,curled flower shape and plump inflorescence.In this study,Clivia horticultural hybrids 1-year-oldand 60-day-oldseedlings as experimental material,using aeroponics cultivation culture technology for seedlingsgrowing and maintenance.Seedlings cultivated in aeroponics without adding plant growth regulators and substrate cultivation cultured seedlings as blank controller through photosynthesis in net photosynthetic rate（Pn）,transpiration rate（Tr）,stomatal conductance（Gs）and extracellular between CO2 concentration（Ci）and other indicators to fixed time tracking;for seedlingsof soluble proteins（SN）,superoxide dismutase（SOD）,peroxidase（POD）and nitrate reductase（NR）and the impact of different cultivation techniques seedlings height,fresh weight,diameter front pseudobulb,pseudobulb side diameter,number of leaves,the maximum leaf length,maximum leaf width,root number,largest root impact indicators related to the incremental growth and long investigation to collect data,and its have a preliminary understanding.With roughly grasp its day variation,this study will provide the theoretical basis and efficient aerosol cultivation Clivia.The main conclusions are as follows:Aeroponics showed its advantages in photosynthetic indices.Tracking revealed that different cultivation techniques could result in seedlings with different curves of net photosynthesis throughout a day.Seedlings from aeroponics followed an“M-shaped”bimodal curve,and had apparent photosynthetic noon-break;by comparison,seedlings from substrate-based cultivation followed a unimodal curve with a shape of a reverse“V”.In terms of average daily net photosynthetic rate,the 4th aeroponics group（the added growth regulators were:NAA:10 mg/L;IBA:1 mg/L）had the highest rate,27.57%higher than the substrate-based cultivation group;furthermore,60-d seedlings from aeroponics had good growth potential,which was 28.36%higher than that of 60-d seedlings from substrate-based cultivation.In terms of the organic matter content of leaves,the SN content in the aeroponics group was higher than that in the substrate-based cultivation group during all the seedling age phases-the optimal performance was seen in the 4th aeroponics group with a content of 5.593mg·g^-1,which was 33.29%higher than the 11th（CK）group,and 31.88%higher than the substrate-based cultivation group.In terms of plant resistance,the mean values of SOD,POD and NR in each of the aeroponics groups were higher than in the substrate-based cultivation group:the 7th group（the added growth regulators were:NAA:10 mg/L;IBA:100 mg/L）had the best comprehensive performance in the SOD and POD content of 1-y seedlings,while the substrate-based cultivation group had the worst one.60-d seedlings in the aeroponics groups had excellent NR value which was 35.79%higher than seedlings of the same age in the substrate-based cultivation group.In terms of plant growth indices,1-y seedlings in the aeroponics groups were significantly better than those in the substrate-based cultivation group in the growth data regarding overall plant shape,root system,leaves,etc.,especially in plant-height increment and root increment;and 60-d seedlings in the former groups had significant advantages over those in the latter group in fresh-weight increment,increment of pseudobulb diameter,and increment of root length.At the beginning of the cultivation,seedlings in the aeroponics groups could produce new roots properly,which was of high practical significance.Although aeroponics also brings good leaf increment,it usually results in seedling leaves with length/width ratio of 4:1-clivia with 3:1 leaves is considered best aesthetically,and substrate-based cultivation can lead to the generation of such clivia.