KLASIFIKASI TANAH RAWA PEGUNUNGAN VOLKANIK DI KABUPATEN BENER MERIAH

Penelitian ini bertujuan untuk mengetahui  klasifikasi tanah rawa pegunungan volkan berdasarkan Taksonomi Tanah di Kabupaten Bener Meriah. Penelitian ini dilakukan dengan metode survai deskriptif-kuantitaf. Terdapat tiga pedon yang diamati, yaitu rawa yang pernah ditanami padi, rawa yang ditanami cabai, dan rawa alami. Di lapangan diamati sifat-sifat morfologinya, kemudian diambil bahan tanahnya dari setiap horison dan dianalisis sifat fisika, kimia, dan mineralogi di laboratorium. Hasil penelitian menunjukkan bahwa ketiga pedon sama-sama memiliki sifat tanah andik. Epipedon masing-masing pedon adalah umbrik, molik dan okhrik. Semua pedon memiliki horison penciri bawah sombrik. Semua pedon tergolong ordo Andisol. Semua pedon tergolong subordo Aquand. Semua pedon tergolong great group Endoaquand. Subgrup masing- masing pedon adalah Lithic, Histic, dan Typic. Famili pedon P1 dan P3 adalah medial, campuran, isohipertermik; sedangkan pedon P2: medial, isohipertermik. Klasifikasi tanah setiap pedon: Lithic Endoaquand, medial, campuran, isohipertermik; Histic Endoaquand, medial, isohipertermik; dan Typic Endoaquand, medial, campuran, isohipertermik

PEMBERIAN KALIUM PADA TANAH GAMBUT TERHADAP PRODUKSI, VIABILITAS, DAN VIGOR BENIH BEBERAPA VARIETAS KACANG TANAH

The research was aimed at finding out the relationship between potassium dosages on peats soil, yield, seedvigor, and viability of peanut. The experiment was arranged ina completely randomized design (CRD), factorial 5 x 4 with 3 replications. Potassium application was consisted of 5 levels: 0 kg ha-1, 25 kg ha-1, 50 kg ha-1,  75 kg ha-1, and 100 kg ha-1. Variety was consisted of  4 levels :  Naga Umbang, Jerapah, Gajah  and  Bison. Variables observed were yield, seed vigor, and seed viability. Results showed that potassium did not exert significant effects on all variables observed, except  on seed vigor and viability.  Varieties significantly affected yield, where Bison provided the best dried pod weight and Jerapah gave the best seed vigor and viability. No significant interaction existed between varieties and dosage of K fertilizer on the peanut yield, seed vigor, and seed viability.                                                                                                                     

Susunan Horison Tanah Sawah pada Toposekuen Latosol Berbahan Induk Volkanik di Daerah Bogor – Jakarta

The Sequence of Horizons of Paddy Soils in a Toposequence of Latosol on Volcanic Parent Materials in the Bogor – Jakarta AreaABSTRACT. The sequence of horizons of paddy soils is different from non paddy cultivated. The aim of the research were: (1) to study the sequence of horizons of paddy soils in a toposequence of Latosol on Volcanic materials in the Bogor – Jakarta Area; (2) to study the sequence of paddy cultivated intensity to sequence of horizons. Twelve pedons of different altitude (90 – 650 m above sea level) and different paddy cultivated intensity (0/year, 1/year, 2/year) were investigated sequence of horizons in the field. The result of the research showed that the horizons sequence, on non paddy cultivated soils consist of: tillage layers and the original soil layers. On 1x paddy/year consist of: plow pan layer, and iron/manganese/nodule Mn illuviation layer. On 2x paddy /year consist of: tillage layer of surface reduction, plow pan layer, Fe/Mn illuviation layer, and reduce subsurface layer