The rapid development of oil palm plantations in West Kalimantan, undoubtedly it helps to boost the economy in West Kalimantan. However, there is also the follow-up which is also important to find a solution with the development of oil palm plantations in West Kalimantan, i.e. the waste generated from oil palm plantations and crude palm oil (CPO) mills.
The assessment utilizes the palm oil waste, i.e. liquid waste (sludge) as an organic fertilizer to support the development of organic vegetables in West Kalimantan, especially in Rasau Jaya Sub-district, Kubu Raya Regency which is funded by Ministry of Research and Technology.
The vegetable plant in this assessment is cauliflower (Brassica oleracea) which is grown with organic farming concept (using only organic pesticides). Cauliflower is a family of Brassicaceae that is commonly grown in upland. But in this assessment, we tried to cultivate cauliflower in lowland such as in Pematang Tujuh Village, Kubu Raya. Organic agriculture enhances soil quality, conserves water, mitigates climate change, and ensures sustained biodiversity. Through its holistic nature, organic farming integrates wild biodiversity, agro-biodiversity and soil conservation, and takes low-intensity farming one step further by eliminating the use of chemical fertilizers, pesticides and genetically modified organisms (GMOs), which is not only an improvement for human health and agro-biodiversity, but also for the associated off farm biotic communities.
The design for the assessment is a randomized complete block design. In general, the treatment used in this assessment is three levels of combination formula of inorganic and organic fertilizers (P) as the main plot, i.e.: P1: 50% inorganic fertilizer: 50% organic fertilizer, P2: 25% inorganic fertilizer: 75 % of organic fertilizers, and P3: 100% organic fertilizer.
The subplot consists of two factorials which were repeated three times. The first factor is four types of organic fertilizer treatments (O), i.e.: O1: liquid was treated with M-Dec, O2: liquid waste treated with Orgadec, and O3: liquid waste treated with local microorganisms; whereas, the second factor is 4 levels dosage of liquid organic fertilizer from CPO mills waste (D), i.e.: D1: 2.5 tons/ha, D2: 5 tons/ha, D3: 7.5 tons/ha, and D4: 10 tons/ha. There is also a control of liquid waste (5 tons/ha) that is not treated with any decomposers and it uses 25% inorganic fertilizer: 75% of organic fertilizers.
The open-field of organic cauliflower harvesting was conducted at August 30, 2012 in order to disseminate the utilization of oil palm sludge as liquid organic fertilizer on organic cauliflower growing. There were some institutions attended this event, such as Mr. Djoko Triyono from the Agency for Extension, Agriculture, Plantation, Fisheries, and Food Security of Kubu Raya, Mr. Yuwono from the Agriculture and Animal Husbandry Institution of Kubu Raya, Mr. Rusyantoro from the Agricultural Extension Station of Rasau Jaya, the Oil Palm Plantation Company of PT. Rezeki Kencana, local government of Pematang Tujuh Village, Mr. Darsono from the Assessment Institute for Agricultural Technology of West Kalimantan, and some beneficiaries (users), i.e. local horticulture farmers. In the discussion, there were some social problem about the oil palm land conflict and the utilization of waste.
From the plant performance, it looks good for organic cauliflower cultivation. However, there is a disease which attacks the organic cauliflower that is croci worm (Crocidolomia pavonana). It may occur due to the extreme dry climate. The organic cauliflower which uses 100% organic fertilizer yields 2.85-3.19 tons/ha. From financial analysis, in general, the net profit is approximately IDR 25,082,000. Therefore, the liquid waste (sludge) of CPO mills which is added with decomposers could be utilized as liquid organic fertilizer for organic cauliflower in order to support the organic vegetables development which is environmentally friendly and could enhance food quality in West Kalimantan. (Dwi P. Widiastuti)