The Analysis of Characteristics of Productivity and Quality Determinants at Tea Plantation in West Java

Tea plantation is declining today as seen on the condition of land conversion, low productivity, the weakened tea export power, less synergized and integrated managerial ability plantations, and many other references that need to be addressed immediately. One of them is a climate change. De Costa et al (2007) state that climate can affect productivity and the quality of the tea plantations. Another opinion argued that the tea plantations need to consider the condition of the land area and so on. From these two statements, the problem deciding factor of production is crucial to analyze. This study aims to analyze the determinant factor of tea production. It is obtained by means of a comparison of the land characteristics with production and quality of tea production. Experiments conducted in the field to test the characteristics of land and taking the production and quality of the tea plant. Experiments carried out by creating a profile 27 which has a different characteristic and variations in production and quality of the tea. It used regression, correlation, factor analysis, and stepwise for land characteristics to become the determinant factors of production and quality of tea. The results of the analysis determines that tea productivity and quality is determined from the N Total, CEC, Al condition, the weight of the contents, the texture of the sand and pF 1. Keywords: land characteristic, tea plantation, land suitability, soil quality, West Jav

Optimasi Paket Pupuk Tunggal pada Tanaman Kelapa Sawit Belum Menghasilkan Umur Satu Tahun

Effective and efficient fertilization is affected by fertilizer dose, and therefore information on the appropriate dose of a single fertilizer for oil palm will be beneficial to increase the efficiency and effectiveness of fertilization in oil palm plantations. The objectives of this research were to study the response patterns and to determine optimum rate of single fertilizer package related to the growth of one year old oil palm trees. The experiment was conducted from March 2013 to February 2014 at IPB-Cargill Teaching and Research Farm of Oil Palm, Jonggol Bogor. The experiment was arranged in randomized block design with one factor and replicated three times. The treatments were four single fertilizer package as followed: control, 300 g urea + 375 g SP-36 + 350 g KCl + 25 g boric acid + 25 g CuSO4.5H2O, 600 g urea + 750 g SP-36 + 700 g KCl + 25 g boric acid + 25 g CuSO4.5H2O, 900 g urea + 1125 g SP-36 + 1050 g KCl + 25 g boric acid + 25 g CuSO4.5H2O per plant. The result showed that application of single fertilizer package significantly increased the growth of young oil palm linearly as shown by plant height, stem girth, leaf area of frond number 9, chlorophyll and P content of the leaves and quadratically on leaf number at the last observation. The optimum rate of single fertilizer for one year old oil palm trees had not been attained at this research because the plant growth response to fertilization was still linear

Permodelan Pertumbuhan dan Produksi Kelapa Sawit pada Berbagai Taraf Penunasan Pelepah

The numbers of leaf frond influence oil palm yield, especially fresh fruit bunch weight and fresh fruit bunch production. The objective of this research was to obtain oil palm growth and production model for different levels of frond pruning. The experiment was conducted at PT. Astra Agro Lestari, Pangkalan Bun, Central Kalimantan, from August 2011 to February 2012. The experiment was arranged in randomized block design with two factors and three replications for each oil palm age. Stella production model was created based on pruning experiment and weather data. Production model can predict 75% variable for oil palm production and fresh fruit bunch weight for different levels of pruning. Keyword: oil palm, Stella model, pruning managemen

Induced Mutations by Gamma Ray Irradiation to Argomulyo Soybean (Glycine Max) Variety

Hanafiah DS, Trikoesoemaningtyas, Yahya S, Wirnas D. 2010. Induced mutations by gamma ray irradiation to Argomulyosoybean (Glycine max) variety. Nusantara Bioscience 2: 121-125. Induced mutation by gamma ray irradiation is one way to increasegenetic variability of plants. This research used gamma ray irradiation on low doses (micro mutation). The aim of this research was toknow the respons of doses level by micro mutation on gamma ray irridation to the growing and development of Argomulyo variety ofsoybean [Glycine max (L) Merr]. The seeds were irradiated by gamma ray micro mutation doses, namely 0 gray, 50 gray, 100 gray, 150gray, and 200 gray. Variations that were obtained of each characters at generation M1 and M2 influences plants growth and developmenteither through qualitative and quantitative that finally will influence plant’s production. The average highest genetic variation at M2generation of soybean was on 200 Gray doses. Results of the research indicated that gamma ray irradiation on 200 Gray doseseffectively caused of plant variation genetic

Studi Radiosensitivitas Kedelai [Glycine Max (L) Merr] Varietas Argomulyo Melalui Irradiasi Sinar Gamma

Benih-benih kedelai dari varietas Argomulyo diiradiasi sinar gamma untuk meningkatkan keragaman genetik, memperbaiki morfologi tanaman dan nantinya untuk mendapatkan produksi hasil yang tinggi. Tujuan penelitian ini adalah untuk mengetahui radiosensitivitas tanaman kedelai [Glycine max (L) Merr ] varietas Argomulyo melalui irradiasi sinar gamma dan mengetahui respon pemberian tingkat irradiasi mikro sinar gamma terhadap pertumbuhan dan perkembangan dari benih kedelai turunan pertama (M ). Penelitian ini 1merupakan percobaan faktor tunggal dosis irradiasi yang terdiri dari delapan taraf, yaitu 0 Gy, 200 Gy, 400 Gy, 600 Gy, 800 Gy, dan 1000 Gy. Untuk mendapatkan nilai Lethal Dosis 50 (LD ), digunakan program Curve-fit 50Analysis. Untuk mengetahui respon pemberian tingkat irradiasi mikro sinar gamma, benih kedelai yang diuji adalah benih kedelai varietas Argomulyo yang diirradiasi dengan dosis rendah sinar gamma (micro mutation) dengan dosis sedikit dibawah LD yaitu 0 Gy, 50 Gy, 100 Gy, 150 Gy dan 200 Gy. Hasil penelitian menunjukkan 50 bahwa nilai Lethal Dosis 50 (LD ) terdapat pada dosis 457,178 Gy. Keragaman yang diperoleh dari tinggi 50 tanaman, jumlah cabang, jumlah polong, jumlah polong hampa dan jumlah biji pada generasi M mempengaruhi 1 pertumbuhan dan perkembangan tanaman baik secara kualitatif dan kuantitatif yang akhirnya akan mempengaruhi produksi tanaman

Kompetisi Tanaman Jagung dan Ubikayu dalam Sistem Tumpang Sari

Intercropping system of maize and cassava has been practiced widely by Indonesian farmer on dry land. Competition between the plant will happen in the system. Field experiment to understand about the competition has been conducted. Field experiment of growing maize (Arjuna, Pioneer 4, and Cargill 9 in various planting densities) and cassava (Adira 1) was conducted for monoculture and intercropped plants. Intercropped cassava increased intraspesific competition of maize. Yield of maize variety of Arjuna, Pioner 4, and Cargill 9 decreased by about 9.7%, 6.7%, and 16.9% respectively. Maize also reduced growth and yield of cassava. When intercropped with Arjuna, pioner 4, and Cargill 9 at the highest density (80 000 plants ha-1), yield of cassava tuber decreased by about 40.6%, 43% and 64.3%, respectively. However, the intercropping still gave a better land productivity, where land equivalent ratio (LER) was larger than 1.0