Electronic Theses and Dissertation

Abstrak. Pemberian unsur hara melalui pemupukan dapat meningkatkan laju pertumbuhan dan kualitas tumbuh bibit kakao. Pemupukan dapat dilakukan dengan menggunakan pupuk anorganik atau pupuk organik. Pupuk organik yang dapat digunakan salah satunya yaitu pupuk kandang. Upaya lain untuk meningkatkan pertumbuhan bibit kakao adalah dengan memberikan biochar. Tujuan penelitian ini yaitu untuk mengetahui respons pertumbuhan bibit kakao pada berbagai dosis pupuk kandang kambing dan biochar tempurung kelapa serta interaksi keduanya. Penelitian ini dilaksanakan di Gampong Pineung, Biochar Research Station, dan Laboratorium Ilmu dan Teknologi Benih, Fakultas Pertanian Universitas Syiah Kuala, Darussalam, Banda Aceh. Pelaksanaan penelitian dimulai dari bulan Januari sampai Juni 2022. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) pola faktorial 4 x 3 dengan 3 kali ulangan. Faktor pertama yaitu dosis pupuk kandang kambing terdiri atas 4 taraf (kontrol, 8 ton ha-1, 17 ton ha-1, dan 25 ton ha-1) dan faktor kedua yaitu dosis biochar tempurung kelapa terdiri atas 3 taraf (kontrol, 10 ton ha-1, dan 20 ton ha-1). Parameter yang diamati yaitu tinggi tanaman, jumlah daun, diameter batang, suhu tanah kedalaman 0 cm, 5 cm, dan 10 cm, pH tanah, kelembapan tanah, bobot brangkasan basah, dan bobot brangkasan kering. Hasil penelitian menunjukkan dosis pupuk kandang kambing terbaik terdapat pada 25 ton ha-1 dan dosis biochar tempurung kelapa terbaik pada 20 ton ha-1. Bobot brangkasan basah dan bobot brangkasan kering terberat dijumpai pada kombinasi dosis pupuk kandang kambing 17 ton ha-1 dan dosis biochar tempurung kelapa 10 ton ha-1.

Kata kunci: diameter batang, jumlah daun, kelembapan tanah, pH tanah, suhu tanah

Abstract. Provision of nutrients through fertilization can increase the rate of growth and the quality of growing cocoa seedlings. Fertilization can be done by using inorganic fertilizers or organic fertilizers. One of the organic fertilizers that can be used is manure. Another effort to increase the growth of cocoa seedlings is to provide biochar. The purpose of this study was to determine the growth response of cocoa seedlings at various doses of goat manure and coconut shell biochar and their interactions. This research was conducted at Pineung Village, Biochar Research Station, and Seed Science and Technology Laboratory, Faculty of Agriculture, Syiah Kuala University, Darussalam, Banda Aceh. The research was carried out from January to June 2022. This study used a 4 x 3 factorial randomized block design (RBD) with 3 replications. The first factor is the dose of goat manure consisting of 4 levels (control, 8 tons ha-1, 17 tons ha-1, and 25 tons ha-1) and the second factor is the dose of coconut shell biochar consisting of 3 level (control, 10 tons ha-1, and 20 tons ha-1). Parameters observed were plant height, number of leaves, stem diameter, soil temperature 0 cm, 5 cm, and 10 cm depth, soil pH, soil moisture, weight wet stove, and dry stove weight. The results showed that the best dose of goat manure was at 25 tons ha-1 and the best dose of coconut shell biochar was at 20 tons ha-1. The heaviest weight of wet stover and dry weight of stover was found in the combination dose of goat manure 17 tons ha-1 and coconut shell biochar dose of 10 tons ha-1. Keywords: stem diameter, number of leaves, soil moisture, soil pH, soil temperature