Judul: Dinamika Air Dalam Tanah Dan Hubungannya Dengan Sifat-Sifat Struktur Tanah Pada Latosol Semplak
Abstrak: Water in soil is important for plant growth as nutriment, nutriment solvent, and nutriment dissolve flow in soil. Volume and water distribution in soil affected by some factor. The factor e. g : soil structure. Soil structure related with soil pore distribution, which is affected water flow and distribution water in soil. In fact, soil structure has many variant both spatial and temporal. Many variant of soil structure caused the high variant pore distribution. Variant of soil structure could happen because of the different land cultivate. The aim of this research are to the dynamics of water in soil at ex-rice field land and dry land and the ationship with soil structure characteristics. This research starting with soil selection which have different soil stucture characteristic (aggregate stability, aggregate distribution, and pore distribution), taking soil sample, soil analysis at the laboratory, experiment and measurement in spacious, and analyse data. Soil moisture ex-rice field land always higher than dry land. Soil moisture ex-rice field land and soil moisture dry land will be higher at deeper soil layer above layer. Dynamics of change soil moisture beetwen ex-rice field land and also dry land caused by different of rain distribution also soil physical characteristic. Relation link among of soil physical characteristic to soil moisture dynamics seen different each other. Soil aggregate stability index have negative correlation with soil moisture. Excelsior soil aggregate satibility index, make soil moisture decreased, and conversely. Total porosity and micropore have positive correlation with soil moisture. Excelsior total porosity and micropore, make soil moisture increase. But the correlation of macropore to soil moisture on ex-rice field land differ from dry land, that is increase of macropore to dry land the degrade soil moisture, whiel on the ex-rice field land raising of macropore can be raise soil moisture.
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Judul: Water movement in various soil pore characteristics and their relation with N, P, K concentration
Abstrak: In dryland, water movement plays an important role in crop water relation, air, and nutrient availability. In the soil, water movement is highly affected by soil pore characteristics, such as total porosity, pore size di stribution, and pore stability. This research aimed to: (1) Determine the relationship between water movement and soil pore characteristics (2) Determine the relationship model between rainfall and water movement and soil moisture dynamic in dryland, (3)Assess the effect of water movement and soil moisture dynamic on soil moisture and nutrient distribution and (4) Determine soil pore characteristics that affect soil nutrient concentration. This research was conducted in the field and laboratory.
Keyword: West Java, Nutrient Concentration, Soil Pore Characteristics, Transient Water Movement, Water Fluxes, Soil Nutrients

Judul: Pengujian Virus Newcastle Disease Gen VII Isolat Lapang Sebagai Virus Standar Pada Uji Tantang Vaksin
Abstrak: This study was conducted to determine the standard of Newcastle disease virus Gene VII field isolate as a virus challenge to vaccine test. A virus suspension that has previously been tested by HA test then titrated with EID50 using 30 Specific Pathogen Free (SPF) of 10 day old chicken embryonated eggs. In addition, chicken lethal dose50 (CLD50) test were used to determine the virus titer that could cause 50% death of the chicken population. The CLD50 test was used 25 day-old-chickens (DOC) divided into 5 groups. The virus was diluted from 10-1 to 10-8. The 104 to 10-8 dilution of NDV was infected to every group of chicken via eyedrop and intranasal with 0.1 ml/chicken dosage. Haemagglutination test showed that the allantoic fluid were contain high titers of NDV is 512 HAU. The infective NDV that had been titrated by EID50 test showed the virus titers is 109 EID50/0.1 ml or 1010 EID50/ml and the virus titers of CLD50 test e.i 106.48 CLD50/0.1 ml or 107.48 CLD50/ml. These results can be concluded that the NDV Gene VII field isolates were most appropriate to be used as a standard virus to vaccine test
Keyword: Newcastle Disease Virus Gene VII, HA tes, EID50 test, CLD50 test