Background: Peatlands are marginal lands that have low soil pH, easy to experience nutrient retention and leaching. If this land is used for oil palm cultivation, it will affect its growth and production. These obstacles can be overcome by using fertilizer technology (Biochike+). Biochar Tankos is an organic fertilizer made from agricultural waste, which when combined with biochar chicken manure can be a highly nutritious organic fertilizer, plus Urea which can increase the total N of the soil. This study aims to examine the application of biochike+ fertilizer technology in peatlands to the growth of oil palm seedlings and the availability of N, P and K nutrients in peat soils. 
 
Methods: The research was conducted in polybags with 6 levels of Biochike+ (B1, B2, B3, B4, B5 and B6) and 5 replications so that there were 30 polybags. The parameters observed were the height and number of leaves every month for 3 months and the chemical properties of the soil after an incubation period of 1 month including pH, N, P and K of available soil. The design was completely randomized design (CRD).&nbsp; 
 
Result: The data obtained were analyzed statistically by analysis of variance (ANOVA) with a 5% significant difference test. showed that the application of Biochike 1 fertilizer (25% biochar Tankos: 75% biochar chicken manure: 100% Urea) gave the highest value to height growth and the availability of N,P,K nutrients in the soil. From an economic analysis, sales of Biochike+ at a price of 1.6 USD per kilogram at the biochar producer level, have provided a profitable value. There are 2 things that benefit from applying Biochike+ fertilizer, namely increasing crop yields and reducing the need for chemical fertilizers.

Effect of Combination of Biochar Tankos and Urea-enriched Chicken Manure (BIOCHIKE+) on Growth Oil Palm Seedling

Background: Alluvial soil has poor chemical properties for the growth of large chili plants, due to high soil acidity, low organic matter and nutrient content and poor soil structure, which will directly cause the growth and production of large chilies to be suboptimal. Efforts that can be made to increase plant growth are by using a combination of biochar tankos and chicken manure biochar (Biochike+). This study aims to determine the effect of Biochike+ fertilizer on the absorption of N, P, K nutrients, growth and yield of large chili plants in alluvial soil and to determine the financial aspects of Biochike+ fertilizer production. 
&nbsp; 
Methods:&nbsp; Cultivation using polybags. The research design used a completely randomized design (CRD) consisting of a combination of biochar doses B0= Control, B1= 10 t.ha-1, B2= 20 t.ha-1, B3= 30 t.ha-1&nbsp;and B4= 40 t.ha-1&nbsp;and analysis of the costs and benefits of Biochike+fertilizer. The treatment was repeated 5 times so that there were 25 polybags.

Result:&nbsp; The administration of Biochike+had a significant effect on all parameters. In the B4 treatment, the production of large chilies reached 300%, N uptake was 352%, P uptake was 200% and K uptake was 120% compared to the control. Financial analysis shows that large chili production using Biochike+ fertilizer is profitable, which is IDR 62,649,420.3 per harvest.

Effect of Combination of Biochar Tankos and Urea-enriched Chicken Manure (BIOCHIKE+) on Growth Oil Palm Seedling

The Effect of Applying Biochike+ Fertilizer to Big Chili (Capsicum annum L.) Production in Alluvial Soil and Financial Analysis