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Tribulus (Tribulus terrestris L.) is a medicinal plant with considerable implementation such as aphrodisiac and anti‑inflammation drugs. This research was conducted to study the effectivity of coconut water and IAA (Indole‑3‑acetic acid) application on various concentration as the growth regulator for tribulus growth on the in vitro and its effect toward observation variables. The material used were cotyledon from tribulus embryo and MS (Murashige and Skoog) medium. The research method used a Completely Randomized Design with first factor of coconut water concentration of 0 mL L-1, 50 mL L-1, 100 mL L-1, and 150 mL L-1 and IAA concentration of 0 ppm, 0.15 ppm, 0.20 ppm, and 0.25 ppm as the second factor. Observed variables were shoots emergence time, number of shoots, shoot height, number of leaves, roots emergence time, number of roots and regression between observation variables. The result showed that the combination of 150 mL L-1 coconut water and 0.25 ppm IAA gave the highest shoot height, roots emergence time, and number of roots. Coconut water treatment on 150 mL L-1 concentration alone gave the best result on shoots emergence time, number of shoots, and number of leaves, while IAA concentration of 0.25 ppm independently gave the highest number of leaves. Regression analysis result indicate that the number of roots has a positive correlation with shoots height, number of shoots and number of leaves.

Tribulus (Tribulus terrestris L.) is a medicinal plant with considerable implementation such as aphrodisiac and anti-inflammation drugs. This research was conducted to study the effectivity of coconut water and IAA (Indole-3-acetic acid) application on various concentration as the growth regulator for tribulus growth on the in vitro and its effect toward observation variables. The material used were cotyledon from tribulus embryo and MS (Murashige and Skoog) medium. The research method used a Completely Randomized Design with first factor of coconut water concentration of 0 mL L-1, 50 mL L-1, 100 mL L-1, and 150 mL L-1 and IAA concentration of 0 ppm, 0.15 ppm, 0.20 ppm, and 0.25 ppm as the second factor. Observed variables were shoots emergence time, number of shoots, shoot height, number of leaves, roots emergence time, number of roots and regression between observation variables. The result showed that the combination of 150 mL L-1 coconut water and 0.25 ppm IAA gave the highest shoot height, roots emergence time, and number of roots. Coconut water treatment on 150 mL L-1 concentration alone gave the best result on shoots emergence time, number of shoots, and number of leaves, while IAA concentration of 0.25 ppm independently gave the highest number of leaves. Regression analysis result indicate that the number of roots has a positive correlation with shoots height, number of shoots and number of leaves. [ABSTRACT FROM AUTHOR]

We examined currently available empirical growth models which could be potentially applicable to coppice growth and production modelling. We compiled a summary of empirical models applied in coppices, high forests and fast-growing tree plantations, including coppice plantations. The collected growth models were analysed in order to find out whether they encompassed any of 13 key dendrometric and structural variables that we found as characteristic for coppices. There is no currently available complex growth model for coppices in Europe. Furthermore, many aspects of coppice growth process have been totally ignored or omitted in the most common modelling approaches so far. Within-stool competition, mortality and stool morphological variability are the most important parameters. However, some individual empirical submodels or their parts are potentially applicable for coppice growth and production modelling (e. g. diameter increment model or model of resprouting probability). As the issue of coppice management gains attention, the need for a decision support tool (e.g. coppice growth simulator) becomes more actual.