Various benefits have been attributed to chitosan in agriculture. This research is aimed at identifying the optimal concentration of chitosan to increase vegetative growth of Amaranthus hybridus L. (green amaranth) and also to determine the effectiveness of chitosan to enable A. hybridus cope with drought stress by acting as an antitranspirant agent. The concentrations of chitosan used to amend the growing medium were 0, 10, 30, 50 and 70 ppm. Results showed that chitosan significantly increased the height of A. hybridus by up to 19.59 % and also significantly increased the number of leaves at 10 ppm. However, chitosan treatment had no effect on chlorophyll content and fresh or dry weight although dosage response was highest at 10 ppm. In addition, chitosan reduced the transpiration rate by 36.66–66.26 %. Therefore, chitosan treatment could be an alternative way to reduce drought stress.
Vegetative character and reproductive at Argostemma from Mount Gede-Pangrango, Mount Halimun, and Mount Salak have been used for the identification of 101 herbarium specimens from Herbarium Bogoriense and new specimens from field. Identifying of herbarium specimens based morphology character on Argostemma hybrid group by previous author still identified as Argostemma montanum. Ovary at Argostemma consist of 2-3 celled, ovary 2 celled is found at A. montanum and A. borragineum, while the ovary of A. uniflorum account of 3 celled. Amount of flower do not range from 3-6, but between 1-8. Study on Argostemma morphology also can be concluded that in Mount Gede-Pangrango, Mount Halimun, and Mount Salak there are 3 Argostemma species, that is A. montanum Blume ex DC, A. borragineum Blume ex DC, and A. uniflorum Blume ex DC. Spreading of Argostemma vertically in Mount Gede-Pangrango, Mount Halimun, and Mount Salak range from 560-2,600 m above sea level. with spreading center 1,000-2,000 m above sea level.
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