Growth of Salam (Syzygium polyanthum) to the Application of Cow Manure and Husk Charcoal on Used Oil Contaminated Soil

Salam plant (Syzygium polyanthum) can grow in marginal soils, such as soil contaminated with used oil. The planting of salam with the application of cow manure and husk charcoal is expected to reduce the bad impact of used engine oil pollution. This study aims to analyze the response to the growth of salam and to obtain information on the optimal dose to increase the growth of salam to the application of cow manure and husk charcoal on soil contaminated used engine oil with a concentration of 60 ml/1 kg of soil. The study used a factorial completely randomized design with two factors and soil analysis test. The result showed that the application of cow manure and its interaction with husk charcoal significantly affected the root shoot ratio (NPA) parameter. The combination of 60 grams of cow manure and 60 grams husk charcoal had the best NPA value of 3,11. The high growth of salam tended to be optimal in the K4A0 treatment (dose of 120 gram of cow manure and 0 gram of husk charcoal). The application of treatment can reduce the Al, Zn, and Mn content in the contaminated with used engine oil. Keywords: cow manure, husk charcoal, root shoot ratio, Syzygium polyanthum, used engine oilTanaman salam (Syzygium polyanthum) dapat tumbuh di tanah marginal, seperti tanah tercemar oli bekas. Penanaman semai salam dengan pemberian pupuk kandang sapi dan arang sekam diharapkan mampu mengurangi dampak buruk pencemaran oli bekas. Penelitian ini bertujuan menganalisis respon pertumbuhan semai salam dan mendapatkan informasi dosis optimal untuk meningkatkan pertumbuhan semai salam terhadap pemberian pupuk kandang sapi dan arang sekam pada tanah tercemar oli bekas dengan konsentrasi 60 ml/1 kg tanah. Penelitian menggunakan rancangan acak lengkap faktorial dengan dua faktor dan uji analisis tanah. Hasil penelitian menunjukkan pemberian pupuk kandang sapi dan interaksinya dengan arang sekam berpengaruh nyata terhadap parameter nisbah pucuk akar (NPA). Pemberian kombinasi 60 gram pupuk kandang sapi dan 60 gram arang sekam memiliki nilai NPA terbaik sebesar 3,11. Pertumbuhan tinggi semai salam cenderung optimal pada perlakuan K4A0 (dosis 120 gram pupuk kandang sapi dan 0 gram arang sekam). Pemberian perlakuan mampu menurunkan kandungan Al, Zn, dan Mn pada tanah tercemar oli bekas. Kata kunci: arang sekam, nisbah pucuk akar, oli bekas, pupuk kandang sapi, Syzygium polyanthu