RESPONS PERTUMBUHAN TANAMAN AREN (Arenga pinnata Merr.) TERHADAP PEMBERIAN LIMBAH CAIR PABRIK KELAPA SAWIT (LCPKS) DAN SOLID DECANTER

Nadia, Tasya (2025) RESPONS PERTUMBUHAN TANAMAN AREN (Arenga pinnata Merr.) TERHADAP PEMBERIAN LIMBAH CAIR PABRIK KELAPA SAWIT (LCPKS) DAN SOLID DECANTER. S1 thesis, Universitas Andalas.

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Abstract

RESPONS PERTUMBUHAN TANAMAN AREN (Arenga pinnata Merr.) TERHADAP PEMBERIAN LIMBAH CAIR PABRIK KELAPA SAWIT (LCPKS) DAN SOLID DECANTER ABSTRAK Penurunan kesuburan tanah pada lahan marginal seperti Ultisol menjadi kendala utama dalam budidaya tanaman aren (Arenga pinnata Merr.). Upaya peningkatan kesuburan dapat dilakukan melalui pemanfaatan limbah cair pabrik kelapa sawit (LCPKS) yang kaya unsur hara makro serta solid decanter sebagai sumber bahan organik. Kedua limbah ini berpotensi besar karena ketersediaannya melimpah di wilayah perkebunan kelapa sawit, namun pemanfaatannya dalam pertanian masih terbatas. Optimalisasi penggunaan LCPKS dan solid decanter diharapkan dapat meningkatkan produktivitas lahan dan mendukung pertanian berkelanjutan. Penelitian ini bertujuan untuk mengetahui pengaruh interaksi dan dosis terbaik LCPKS dan solid decanter terhadap pertumbuhan vegetatif tanaman aren. Penelitian dilaksanakan di Nagari Sungai Dareh, Kecamatan Pulau Punjung, Kabupaten Dharmasraya, dan Laboratorium Universitas Andalas Kampus III pada Mei–Oktober 2025. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) faktorial dengan dua faktor, yaitu dosis LCPKS (0, 500, 1000, dan 1500 ml/aplikasi/tanaman) dan dosis solid decanter (0, 300, dan 500 g/tanaman) dengan tiga ulangan. Hasil penelitian menunjukkan adanya interaksi antara LCPKS dan solid decanter terhadap pertambahan tinggi tanaman serta kadar klorofil a dan b. Secara tunggal, LCPKS berpengaruh nyata terhadap diameter bonggol, jumlah daun, panjang, dan lebar daun dengan dosis terbaik 1000 ml/aplikasi/tanaman, sedangkan solid decanter berpengaruh nyata terhadap diameter bonggol, panjang, dan lebar daun dengan dosis terbaik 300 g/tanaman. Kombinasi keduanya mampu memperbaiki sifat fisik dan kimia tanah sehingga meningkatkan pertumbuhan vegetatif tanaman aren pada tanah Ultisol. Kata kunci: Arenga pinnata, LCPKS, Pertumbuhan vegetatif, Solid decanter, tanah Ultisol Growth Response of Sugar Palm (Arenga pinnata Merr.) to the Application of Palm Oil Mill Effluent (POME) and Solid Decanter ABSTRACT The decline in soil fertility on marginal lands such as Ultisol is a major constraint in the cultivation of sugar palm (Arenga pinnata Merr.). Efforts to improve soil fertility can be carried out through the utilization of palm oil mill effluent (POME) rich in macronutrients and solid decanter as a source of organic matter. Both types of waste have great potential due to their abundant availability in oil palm plantation areas; however, their use in agriculture remains limited. The optimization of POME and solid decanter application is expected to increase land productivity and support sustainable agriculture. This study aimed to determine the interaction and the best dosage of POME and solid decanter on the vegetative growth of sugar palm seedlings. The research was conducted in Nagari Sungai Dareh, Pulau Punjung District, Dharmasraya Regency, and at the Laboratory of Andalas University Campus III from May to October 2025. A factorial Completely Randomized Design (CRD) was used with two factors, namely POME dosage (0, 500, 1000, and 1500 ml/application/plant) and solid decanter dosage (0, 300, and 500 g/plant) with three replications. The results showed an interaction between POME and solid decanter on plant height increment and chlorophyll a and b content. Individually, POME significantly affected corm diameter, number of leaves, and leaf size with the best dose of 1000 ml/application/plant, while solid decanter significantly affected corm diameter and leaf size with the best dose of 300 g/plant. The combination of both improved the physical and chemical properties of Ultisol, thereby enhancing the vegetative growth of sugar palm seedlings. Keywords: Arenga pinnata, POME, vegetative growth, solid decanter, Ultisol

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