Response of several black potato (Plectranthus rotundifolius) accession against watering levels on growth and production phase

Abstract

Syarif F. 2015. Response of several black potato (Plectranthus rotundifolius) accession against watering levels on growth and production phase. Pros Sem Nas Masy Biodiv Indon 1: 1536-1541. The purpose of this experiment is to obtain Hausa potato accessions that are tolerant to drought stress. The study was conducted in six months starting from seedling phase to reproductive phase in Greenhouse, Research Center for Biology-LIPI, Cibinong Science Center. The research was designed in completely randomized factorial with three replications. The first factor was four accessions of Hausa potatoes namely Klefa imut 6, Klefa imut 25, Nganjuk and Sangian. The second factor was the level of water: 250 mL, 500 mL, and 750 mL. Watering was done every two days. The parameters observed were plant height, width of the canopy, fresh biomass weight, fresh weight of tuber, tuber number, tuber length, and diameter, proximate analysis of bulbs and tubers. The results showed that the highest plant and the widest canopy were obtained in the accession of Nganjuk and Sangian. The rate of the best water for plant height and crown width contained in the provision of water to 500 mL/2 days. Most tuber production, bulbs longest and largest diameter produced on accession Klefaimut 25 consecutive 209.67 g/plant; 5.08 cm/bulbs and 4.0 cm/tuber followed Klefaimut 6 accession and accession 6 Nganjuk. Giving the lowest water level of 250 mL/2 days increases the protein content up to 12.16 on the accession Sangian and the level of water provision at most 750 mL/2 days to produce content of the highest fat and carbohydrate sequentially 1.37%; 75.13% in the accession Nganjuk..