Judul: Linkage Characteristics of Land with Palm Oil Productivity as a Basic for Land Evaluation
Abstrak: Variability of oil palm productivities are various due to land properties and characteristics. These require informations of soil fertility in every soil types. These informations are able to drive land management and technical culture of oil palm. The informations can be obtained through land evaluation. This study aims to assess the potential land suitability for oil palm. Field surveys and observations carried out at oil palm plantation business unit Bentayan, PT Perkebunan Nusantara VII (Persero), South Sumatra. Chemical analysis conducted at the Laboratory soil of Chemistry and Fertility, Department of Soil Science and Land Resources, Faculty of Agriculture, Bogor Agricultural University. Land classes were determined on land characteristics i.e. based on degree at the limiting factor classifield as actual land suitability classification. In this case, land characteristics were matching with oil palm land suitability criteria. Land suitability for production based was also measured to obtain potential land suitability classification. The results show that land classes at oil palm based on land characteristics obtained covering S2f, S2wf, S3w, S3wf, and N1w. Actual land suitability at S3w increased to S2 potential class at 5, 7 and 9 years palm oil. Actual land suitability at N1w increased to S3 potential class at 7 years palm oil, and S2wf increased to S1 at 5 years palm oil These increases were caused improvement of the limiting factor i.e. improvement of drainage, application of organic materials, soil ameliorant, and fertilizers.
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Judul: Pengaruh Pirit Terhadap Sifat Kimia Tanah Serta Produksi Tanaman Kelapa Sawit (E. guineensis)
Abstrak: Development of oil palm plantation areas in Indonesia has significantly increased every years. This makes the development leads to marginal lands, like the lands acid sulfate soil which has sulfidic material. The expansion of the plantation into the marginal lands, is not an expected alternative, but the suitable lands were limited. Oxidation of pyritic material in aerobic condition will produce sulfuric acid and mineral jarosit with extreme acidity that can prohibit plant growth. The conditions is obtained due to land reclaimation through establishment of drainage facilities. On the other hand, large amounts of plant nutrients washed out from the lands. The leaching are more conducive in high acidity drainage water. Ultimately this processes are reducing soil fertility with low soil pH as well. The study aims to determine the effect of different depths of pyritic material and pyrite oxidation on soil chemical properties and oil palm production. Location of soil sampling and observations conducted in the oil palm plantation Business Unit Bentayan and Betung Krawo, PT Perkebunan Nusantara VII (Persero), South Sumatra. Analysis of soil samples carried out at the Laboratory of Department of Soil Science and Land Resources, Faculty of Agriculture, Bogor Agricultural University. Observations focused on the depth pyritic material at <30 cm, 30-60 cm, and > 60 cm, and not containing pyritic material. Special observation conducted on soil chemical properties at the soil with and without oxidation. The results show that the content of pyrite at depths <30 cm have a significant effect on increasing soil acidity and exchangeable aluminum content (Al-dd), and reduced levels of N-total nutrients, potassium (K) and production of fresh tube fruits. Oxidation pyrite also gives a tendency of decreased levels of available nutrients phosphorus (P), calcium (Ca), magnesium (Mg), and base saturation. Pyritic lands which have undergone an oxidation process tended to decrease fertility.
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Judul: Trichomonas Gallinae Penyebab Trichomonosis Pada Unggas
Abstrak: Trichomonas gallinae adalah protozoa yang bergerak aktof dengan keempat flagella yang mempunyai layar dan pada salah satu sisinya terdapat membran seperti sirip ikan yang berombak. Spesies dari genus Trichomonas ini mempunyai arti penting pada unggas, karena dapat menyebabkan infeksi pada alat pencernaan bagian atas.
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