Evaluasi Pupuk Organik Granul Diperkaya Lamtoro dan Mikoriza Terhadap Pertumbuhan dan Produksi Biomassa Sorgum Samurai 1 Ratun 1

Abstract

Lahan marginal memiliki tingkat kesuburan rendah yang dapat membatasi pertumbuhan dan produktivitas biomassa sorgum. Penelitian ini bertujuan mengevaluasi efektivitas pupuk organik granul bermikoriza yang diperkaya lamtoro terhadap pertumbuhan dan produktivitas biomassa sorgum (Sorghum bicolor L.) varietas Samurai 1 ratun 1 pada lahan marginal. Penelitian menggunakan Rancangan Acak Kelompok faktorial 3 × 3 dengan empat ulangan. Perlakuan terdiri atas pupuk organik granul (G), pupuk organik granul bermikoriza (GM), dan pupuk organik granul diperkaya lamtoro dan mikoriza (GLM) pada dosis 2, 3, dan 4 ton ha?¹. Data dianalisis menggunakan analisis ragam dan uji Duncan. Hasil penelitian menunjukkan bahwa interaksi jenis dan dosis pupuk berpengaruh nyata (P<0,05) terhadap lebar daun umur 4 MSP. Jenis pupuk berpengaruh sangat nyata (P<0,01) terhadap kolonisasi akar, tinggi tanaman, diameter batang, panjang daun, lebar daun, jumlah daun, kandungan klorofil, produksi biomassa, dan nilai brix. Perlakuan GLM menghasilkan kolonisasi akar tertinggi sebesar 48,66%, tinggi tanaman 183,96 cm, diameter batang 1,36 cm, panjang daun 69,53 cm, lebar daun 6,31 cm, jumlah daun 8,71 helai, biomassa segar 37,97ton ha?¹, biomassa kering 7,46 ton ha?¹, dan nilai brix 11,82°Bx. Disimpulkan bahwa pupuk organik granul diperkaya lamtoro dan mikoriza merupakan perlakuan terbaik untuk meningkatkan pertumbuhan dan produksi biomassa sorgum varietas Samurai 1 ratun 1 pada lahan marginal.

Marginal land has low soil fertility, which can limit the growth and biomass productivity of sorghum. This study aimed to evaluate the effectiveness of mycorrhiza-enriched granular organic fertilizer supplemented with Leucaena leucocephala on the growth and biomass productivity of first ratoon Samurai 1 sorghum (Sorghum bicolor L.) grown on marginal land. The experiment was arranged in a 3 × 3 factorial randomized complete block design with four replications. The treatments consisted of granular organic fertilizer (G), mycorrhiza-enriched granular organic fertilizer (GM), and granular organic fertilizer enriched with Leucaena leucocephala and mycorrhiza (GLM) applied at rates of 2, 3, and 4 t ha?¹. Data were analyzed using analysis of variance followed by Duncan's multiple range test. The results showed that the interaction between fertilizer type and application rate significantly (P<0.05) affected leaf width at 4 WAH. Fertilizer type had a highly significant effect (P<0.01) on root colonization, plant height, stem diameter, leaf length, leaf width, leaf number, chlorophyll content, biomass yield, and Brix value. The GLM treatment produced the highest root colonization (48.66%), plant height (183.96 cm), stem diameter (1.36 cm), leaf length (69.53 cm), leaf width (6.31 cm), leaf number (8.71 leaves), fresh biomass yield (37.97 t ha?¹), dry biomass yield (7.46 t ha?¹), and Brix value (11.82 °Bx). It was concluded that granular organic fertilizer enriched with Leucaena leucocephala and mycorrhiza was the most effective treatment for improving the growth and biomass production of first ratoon Samurai 1 sorghum grown on marginal land.