Application of CPPU Growth Regulator (N-(2-Chloro-4-pyridyl)-N'-phenylurea) and Planting Media Modification on the Growth of Porang (Amorphophallus muelleri Blume) Madiun Variety 1: Morphological Responses

Abstract

The porang plant (Amorphophallus muelleri Blume) is a tuber plant that is widely cultivated because it has the potential to be an alternative food source. Apart from using bulbils, porang plants can be propagated using stem tubers. One of the obstacles faced in cultivating porang plants is the dormancy period which lasts 7-8 months and the short active growth period of 4-5 months each year. This makes it difficult to increase the productivity of porang plants. Porang plants grow well in light-textured, loose and fertile planting media. The planting medium consisting of a mixture of top soil, compost and husk charcoal has characteristics that are suitable for porang planting media. The research aims to determine the growth of porang stem tubers as morphological respon given Plant Growth Regulators (PGRs) CPPU and modification planting medium. The research design used a Completely Randomized Design (CRD) with two factorials. The first factor is CPPU concentration and the second factor is modification of the planting media. Based on the results of the ANOVA test, it was found that the interaction of CPPU and modification of the planting media had an effect on the time of shoot emergence and number of shoots. Meanwhile, CPPU PGRs influence shoot height. Tuber weight was not influenced by CPPU PGRs and planting media modification. The time of emergence of the first shoots in the C1P1 treatment with an average time of shoot emergence 7 days after planting. The highest number of shoots was found in the C0P4 treatment with an average number of shoots of 13 for each tuber. The best shoot height was found in the C0P2 treatment with an average shoot height of 1.8 cm. The best tuber wet weight was found in the C1P4 treatment with an average increase in tuber weight of 4.6 grams.