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The Effects of the Growth Regulator Paclobutrazol on Physiological Characteristics of Rain Tree (Albizia saman Jacq. Merr.)

Fathurrahman F., Zahrah Siti, Ernita, Heriyanto, Mahadi Imam

Journal of Ecological Engineering

2023

Vol. 24, nr 12

346--355

The increase of carbon dioxide (CO2) has been identified since the industrial revolution era. Albizia saman is a tree species which can absorb excess CO2 from the atmosphere in large quantities. This study was to identify the effect of spraying time and concentration of paclobutrazol on the growth of A. saman seedlings. This research using a completely randomized design, the first factor is spraying time which is divided into three levels: spraying at age of 25, 50 and 75 days. The second one is the concentration of paclobutrazol, consisting of four levels: control, 75, 150 and 225 mol•L-1. The further test used are DMRT at p<0.05. Paclobutrazol influences the higher rate of photosynthesis, namely 38.27 M CO2 m-2s-1. There are varied stomatal conductance values, where the highest value is 0.35 mM m-2s-1 and the lowest carbon dioxide content in treatment is 56.86 mol•L-1. The slowest transpiration rate is the combination of 50 days after treatment, and the concentration of paclobutrazol is 0.24 mM H2O m-2s-1. The shortest growth of A. saman is shown from the 50-day treatment using paclobutrazol and 150 mol•L-1 concentration. The relationship between photosynthetic rate and stomatal conductance and transpiration concludes that the trend is similar to that of the curve, whereas the trend is not the same as the internal CO2.

Inhibiting effect of citric acid on the floatability of serpentine activated by Cu(II) and Ni(II) ions

Huang Jun-wei, Zhang Cheng-qiang

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 4

960--968

The laboratory researches about the inhibiting effect of citric acid on the flotation performance of serpentine activated by Cu2+ and Ni2+ were carried out through micro flotation tests, zeta potential measurements, collector adsorption capacity measurements and solution chemistry analysis. The flotation results showed that Cu2+ and Ni2+ could remarkably activate the flotation of serpentine when the pH value was more than 6, however, this activation could be effectively weakened by adding citric acid. Zeta potential measurement and adsorption capacity measurement indicated that the presence of citric acid could prevent the adsorption of Cu2+ and Ni2+, and therefore reduce the adsorption amount of potassium butyl xanthate on serpentine surface. Furthermore, solution chemical analysis of the flotation system showed that copper hydroxide Cu(OH)2(s) and the nickel hydroxide Ni(OH)2(s) were the main component in the pH range of 9 to 10, which adsorbed onto serpentine surface and made it activated; while the citric acid could effectively prohibit the formation of these metal hydroxide in slurry so as to inhibit the activation impact.