PENGARUH DOSIS DAN SAAT INOKULASI Lemna polyrhiza TERHADAP PERTUMBUHAN DAN HASIL PADI SAWAH

Abstract

Penelitian bertujuan mengetahui: 1) dosis optimum inokulasi Lemna polyrhiza (Lp) bagi padi di lahan
sawah, 2) waktu inokulasi Lp terbaik bagi pertumbuhan dan produksi padi sawah, dan 3) interaksi dosis dan saat
inokulasi Lp bagi padi sawah. Rancangan percobaan adalah Rancangan Acak Kelompok Lengkap (RAKL) tiga
kali ulangan. Faktor yang dicoba: 1) dosis aplikasi Lp (D): D0 (kontrol atau tanpa Lp); D1 (25 g Lp m-1); D2 (50
g Lp m-1), dan D3 (75 g Lp m-1), serta 2) saat inokulasi Lp (P): P1 (padasaat tanam padi) dan P2 (14 hari setelah
tanam padi). Variabel yang diamati: tinggi tanaman, jumlah anakan produktif, tingkat kehijauan daun, bobot jerami
per rumpun, bobot jerami/ha, jumlah gabah per malai, bobot 1000 biji, bobot gabah kering/ rumpun, serapan
nitrogen, dan prosentase penutupan petak percobaan oleh Lp. Hasil penelitian menunjukkan bahwa inokulasi Lp
memberikan pengaruh sangat nyata terhadap variabel tingkat kehijauan daun dengan hasil tertinggi pada perlakuan
D2 (50 g Lp m-1) dan prosentase penutupan petak percobaan oleh Lp dengan hasil terbaik pada perlakuan D3 (75
g Lp m-1). Hasil gabah tertinggi dicapai oleh perlakuan D1P1 dengan rata-rata hasil 1,56 ton/ha (konversi). Saat
inokulasi Lp berpengaruh nyata terhadap bobot seribu biji, bobot tertinggi pada perlakuan P1 (bersamaan saat
tanam padi); prosentase penutupan percobaan petak oleh Lp terbaik pada perlakuan P1 (bersamaan saat tanam
padi). Kombinasi perlakuan berpengaruh nyata terhadap prosentase penutupan petak percobaan oleh Lp dengan
hasil terbaik pada perlakuan D3 x P2 (75 g Lp m-1 yang diberikan 14 hari setelah tanam padi).
Kata kunci: Padi, L. polyrhiza, dosis dan saat inokulasi L. polyrhiza
ABSTRACT
This research aimed to found-out: 1) the optimum dose of Lemna polyrhiza (Lp) innoculation to lowland
rice, 2) the best innoculation time of Lp to growth and yield of lowland rice, and 3) the dose and inoculation time
interactions of Lp torice. Theexperiment was the factorial Randomized Complete Block Design repeated by three
times. The factors were tested: 1) Lp innoculation dose: D0 (control or non Lp), D1 (25 g Lp m-1), D2 (50 g Lp
m-1),and D3 (75 g Lp m-1), and 2) Lp’s innoculation time (P): P1 (at rice plant planting) and P2 (14 days after
rice planting). The variables observed: the plant height, number of productive tillers, leaf greeness level, straw
dry weight/hill, straw dry weight/ha, number of grain/panicle, 1000 grain weight, grain dry weight/hill, nitrogen
uptake, and the Lp covering percentage. The resultshowed: The Lpdose gave very significant effect to leaf greeness
level at D2 (50 g Lp m-1) and to the Lp covering percentage at D3 (75 g Lp m-1), both were the best values. The
highest rice yield was achieved by D1P1 by 1,56 ton/ha (conversion average). Innoculation time of Lp gave
significant effect: to 1000 grain weight at P1 (at rice planting) as the best results, and to the Lp covering
percentage (the best result was P1). The best combination of treatmentwhich gave significant effect to the
percentage of covering experiment field was D3 x P2 ( 75 g Lemna m-1 which was innoculated at 14th day after
rice planting).
Keywords: Rice, L. polyrhiza, dose and innoculation time of L. polyrhiza