Abstrak   Telah dilakukan penelitian mengenai hubungan kekerabatan pada delapan kultivar talas (Colocasia esculenta) berdasarkan karakter morfologi organ vegetatif. Kultivar-kultivar tersebut yakni talas kaliurang, burkok, bentul, bogor, sutra, kudo, lampung dan semir. Total karakter yang diamati berjumlah 35 karakter. Karakter-karakter tersebut kemudian dibuat skoring. Hasil skoring dianalisis dengan metode UPGMA (Unwight Pair Group Method with Arithmetic Average) menggunakan program komputer PAUP versi 4.0b10 sehingga terbentuk fenogram. Hasil penelitian menunjukkan variasi morfologi organ vegetatif yang cukup tinggi. Dari seluruh karakter, hanya lima karakter yang tidak menunjukkan adanya perbedaan. Karakter tersebut yaitu bentuk daun dan ujung daun, rasio panjang terhadap lebar daun, pola tepi pelepah dan posisi dominan bentuk helai daun tua. Dari fenogram diketahui bahwa seluruh kultivar yang diamati membentuk dua kelompok utama. Kelompok pertama terdiri dari kaliurang, burkok, bentul, bogor, lampung dan sutra, yang membentuk tiga subkelompok. Kelompok kedua terdiri dari kudo dan semir. Hasil analisis fenetik menunjukkan kultivar bogor dan lampung merupakan dua kultivar yang sangat dekat hubungan kekerabatannya dengan nilai kesamaan sebesar 80%. Kata kunci : Colocasia esculenta, fenetik, kultivar, organ vegetatif Abstract This research was conducted to find out relationship on eight cultivars of taro (Colocasia esculanta) based on vegetative morphological characters. They were kaliurang, burkok, bentul, bogor, sutra, kudo, lampung and semir. Total characters observed were 35 characters and the scoring  was also performed. In order to form a phenogram, the scoring then were analyzed using computer software PAUP version 4.0b10, the UPGMA method (Unwight Pair Group Method with Arithmetic Average). Results showed that morphological variation of vegetative characters are quite high. Of all the characters, only five characters that indicated any significant differences. These characters were leaves shape, leaves tip shape, length-width leaves ratio, midrib leaves, and dominant position of the old leaves. From the phenogram, it was known that all cultivars observed were form into two main groups. The first group consists of kaliurang, burkok, bentul, bogor, lampung and sutra, which formed three subgroups. The second group consists of kudo and semir. The results of the phenetic analysis showed the cultivar bogor and lampung are two cultivars that are very close relationship ties with the similarity value of 80%. Keywords : Colocasia esculenta , phenetic, cultivars, vegetative

Abstrak Pupuk dan pestisida kimiawi merupakan hal penting pada sistem budidaya tetapi jika  penggunaannya berlebih dapat meningkatkan kandungan logam berat kadmium  (Cd) dalam tanah. Penelitian ini bertujuan menganalisis pertumbuhan tanaman kentang (Solanum  tuberosum L.) pada tanah yang terakumulasi logam berat kadmium. Sampel tanaman berasal dari lokasi pertanian kentang Pangalengan Jawa Barat. Parameter yang diukur yaitu kandungan klorofil, biomassa, kandungan logam kadmium dalam tanah dan umbi kentang. Kandungan kadmium dalam sampel tanah dan umbi kentang diukur dengan menggunakan Atomic Absorption Spectrophotometry (AAS). Hasil penelitian menunjukkan kandungan kadmiumpada lahan pertanian kentang telah melebihi ambang batas. Kadmium terakumulasi dalam umbi kentang, tetapi masih berada di bawah ambang batas. Klorofil, berat kering, dan berat basah mengalami kenaikan setiap minggunya (4-10 Minggu Setelah Tanam). Adanya logam kadmium  yang diserap oleh tanaman kentang dapat menghambat pembentukan  klorofil sehingga akan mempengaruhi biomassa tanaman. Kata kunci: klorofil, biomassa, kentang, kadmium Abstract Chemical fertilizers and pesticides are important in the culture system but if the excessive usage may increase the content of heavy metals cadmium ( Cd ) in the soil. This study aims to analyze the growth of the potato ( Solanum tuberosum L.) on the ground that accumulate heavy metals cadmium. Plant samples derived from potato farming locations Pangalengan West Java.The parameters are chlorophyll content, biomass, cadmium  content in soil and potato tubers. The content of cadmium in soil and potato tuber samples were measured using Atomic Absorption Spectrophotometry (AAS). The results showed cadmium content in potato farms has exceeded the threshold. Cadmium accumulates in potato tubers, but still below the threshold. Chlorophyll, dry and fresh weight increase every week (4-10 Weeks After Planting). The presence of the metal cadmium is absorbed by the potato can inhibit the formation of chlorophyll that will affect plant biomass . Keywords: chlorophyll, biomass, potatoes, cadmium