This research aimed to study the effect of the application of waste of palm oil factory liquid on the soil physical characteristic of palm oil plantations. The application of waste of palm oil factory liquid done on a tract the application of which is called by the land application (LA) and LA have been made over 8 years. The research conducted inland of palm oil plantation Batubara Regency, North Sumatra Province from August to November 2015. The method used in this research was survey method. Determination of the sampling and research location was done deliberately by the purpose of the research (purposive sampling). Soil samples for analysis of soil physical characteristic were taken from distance 1, 2, 3, 4, and 5 meters from canal application of palm oil factory liquid waste or land application (LA) with 0-10 cm, 10-20 cm and 20-30 cm depth each other taken from 5 points, included two on the right and left upper of LA and two on the right and left downstream of LA, and without LA used as a control. The results showed that the application of waste of palm oil factory liquid to decreases bulk density and increase the total pore space, water content, permeability and C-organic of soil of oil palm plantations compared to control at a distance 1 meter from LA and decreased with the farther the distance LA (5 m) and deeper (0-30cm), but will not affect particles density.
The research was conducted from August 2014 to Januari 2015 in the Ultisol Land, Pematang Berangan Village, Rokan Hulu Regency, Riau Province. The study aims to determine the availability of P, P and Si uptake by upland rice plants granting silicate and phosphate fertilizer on Ultisol land. The form of this research is experimental factorial completely randomized design consist of two factors. The first factor is silicate consists of four levels (0, 50, 75, and 100 kg SiO2/ha), while the second factor is phosphate fertilizer consists of four levels (0, 36, 54, and 72 kg P2O5/ha), each combination was repeated three times. The results showed that administration of silicates and phosphates increase the availability of P, P and Si uptake of upland rice crop. Giving of 100 kg SiO2 and 36 kg P2O5 per hectare increase uptake of P and Si, each respectively increased by 208 % and 218 % compared without silicates and phosphates fertilizer.
Palm oil (Elaeis guineensis Jacq.) is a plantation crop which is quite important in Indonesia because it accounts for foreign exchange and create employment that is high enough. Palm oil empty fruit bunches (EFB) is estimated at 20% of fresh fruit bunches ( FFB ) and coco in (cocopeat) are very much in Riau as raw material for fertilizer / compost. Subsoil ultisol a bottom layer of soil with sufficient depth within therefore very potential as a medium of palm oil nursery but has a low fertility signified by the nature of physics, chemistry and biology poor. Organic matter such as EFB compost and cocopeat can improve physical, chemical and biological subsoil ultisol. The research aimed to study the effect of EFB compost , cocopeat and a mixture of both the subsoil ultisol medium on the growth of palm oil seedlings in pre nursery. The study was conducted at the experimental station of Agriculture Faculty of the University of Riau from June to August , 2015. Research conducted an experiment using a completely randomized design (CRD) consisting of 6 treatments (K0 : without treatment , K1 : 100 g cocopeat , K2 : 100 g compost EFB , K3 : 50 g compost EFB + 50 g cocopeat , K4 : 75 g of compost EFB + 25 g cocopeat and K5 : 25 g compost cocopeat EFB + 75 g per plant) each repeated 4 times. The results showed treament EFB compost 50 g and cocopeat 50 g produce in the growth palm oil seedlings better than the other treatments on medium subsoil ultisol in pre nursery.
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