Soil Characteristics In The Rhizosphere And Its Relationship With The Growth Of The Camphor Trees In Sirandorung Subdistrict, Tapanuli Tengah District

Abstract

The studied to evaluate soil characteristics in the rhizosphere and its relationship with the growth of Camphor Trees (Dryobalanops aromatica) which was carried out from April to June 2018 in Siordang Village, Sirandorung Sub District, Tapanuli Tengah. The research was funded by the Direktorat Riset dan Pengabdian Masyarakat Direktorat Jenderal Penguatan Riset dan Pengembangan Kementerian Riset, Teknologi dan Pendidkan Tinggi, fiscal year 2018. The study used a survey method with the determination and sampling of land carried out intentionally (purposive sampling), namely on the soil in the root area (rhizosphere) of camphor trees that still exist, maintained by residents in the arable land, as many as 30 observation points. The results showed that the mean value of soil pH in rhizosphere of camphor trees was 4.08 classified as very acidic, C-organic content and N-total soil content of 2.20% and 0.31% were classified as moderate, while nutrient content P-total (mean 0.04%) and K-exchange able (mean 0.25 me/100g) are low and levels of Ca, Mg and Na can be classified as very low. Although the value of the CEC was high (mean 27.39 me/100g), but the saturation of the base was very low (mean only 2.95%). The soil texture of mothballs is sandy clay loam and the soil is generally loose with a mean bulk density of 0.89 g/cm3. The Regression test results showed that both simple regression and multiple regression between soil characteristics with diameter of camphor tree did not significant, but on tree height, some parameters showed a significant.