This research was aimed to know the response of plant growth and yield of ratoon rice via application of bio-cow urine and topping level on ratoon rice planted in pot with size of diameter 30 cm and 20 cm in height. This research was conducted on concerete roof house in Sutrisno street, No. 222/435 A Sukaramai, Medan with elevation ± 33 meter above sea level (m asl) started in October 2015 to March 2016. Experimental design used in this study was Randomised Complete Block design (RCBD) factoral

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... with 2 factors assessed whereby Bio-Cow Urine (U) as the first factor with 4 level i.e. U 0 (without application bio-cow urine), U 1 (100 ml/pot), U 2 (200 ml/pot), U 3 (300 ml/pot), whereas Topping Ratoon Level (P) as the second factor with 3 level i.e. P 1 (20 cm topping from stem), P 2 (25 cm topping from stem) dan P 3 (30 cm topping from stem). This research consisted of 12 treatment combinations with 3 replications. Data observation was analised by using analysis of variance (ANOVA) and followed by Duncan Multiple Range Test (DMRT) for significance treatments effect. The treatment of application of Bio-cow urine at 300 cc/l of water (U 3 ) gave significant highest on mean of leaf area index (71,13) followed by treatment of Bio-cow urine at 200 cc/l of water (U 2 ) (59,28) and control (54,31). Meanwhile, the application of Bio-cow urine at 200 cc/l of water (U 2 ) gave significant highest on mean of number of filled grain per panicle (110,62) followd by U 3 treatment (108,29) and U 1 treatment (99,87). On parameter measurement of number of grains per empty panicle, control treatment resulted significant highest (39,42). Treatment of topping ratoon level at 20 cm from basal stem (P 1 ) gave significant highest on plant height (86,77 cm) followed by P 2 treatment with topping at 25 cm from basal stem (80,38). The P 1 treatment was also resulted in the highest number of tillers per colony (105,71), number of filled grain per panicle (112,63) and weight of 1000 seeds (19,72). Meanwhile on parameter measurement of number of grains per empty panicle, the treatment of topping ratoon level at 30 cm from basal stem (P 3 ) resulted in significant highestammounting of (34,93) followed by P 2 treatment (27,52) and P 1 treatment (20,97). ABSTRAK Penelitian ini bertujuan untuk mengetahui respon pertumbuhan dan produksi padi ratun melalui pemberian pupuk organik cair bio urin sapi dan tinggi pangkasan padi ratun yang ditanam di dalam pot berdiameter 30 cm dan tinggi 20 cm. Penelitian ini dilaksanakan di atas atap rumah bertingkat di Jalan Sutrisno No. 222/435 A Sukaramai, Medan, dengan ketinggian tempat ± 33 meter di atas permukaan laut (m dpl) bermula dari bulan Oktober 2015 sampai dengan bulan Maret 2016. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 2 faktor dimana Bio Urin Sapi (U) sebagai faktor pertama dengan 4 taraf yaitu U 0 (tanpa aplikasi), U 1 (100 ml/pot), U 2 (200 ml/pot), U 3 (300 ml/pot), sedangkan Tinggi Pangkasan Batang (P) sebagai faktor kedua dengan 3 taraf yaitu P 1 (20 cm dari pangkal batang), P 2 (25 cm dari pangkal batang) dan P 3 (30 cm dari pangkal batang). Penelitian ini terdiri dari 12 kombinasi perlakuan dengan 3 ulangan. Data hasil pengamatan diuji dengan analisa sidik ragam (ANOVA) dan dilanjutkan dengan uji beda rataan menurut Duncan (DMRT) apabila menunjukkan pengaruh berbeda nyata. Perlakuan pemberian Bio urin sapi pada 300 cc/l air (U 3 ) memberikan pengaruh berbeda nyata tertinggi pada rataan luas daun (71,13) diikuti perlakuan Bio urin sapi 200 cc/l air (U 2 ) (59,28) dan kontrol (54,31). Sedangkan pemberian Bio urin sapi pada 200 cc/l air (U 2 ) memberikan rataan tertinggi jumlah gabah isi per malai (110,62) diikuti perlakuan U 3 (108,29) dan perlakuan U 1 (99,87). Pada parameter pengukuran jumlah gabah hampa per malai, perlakuan kontrol memberikan rataan tertinggi (39,42). Perlakuan tinggi pangkasan batang 20 cm dari pangkal batang (P 1 ) memberikan pengaruh berbeda nyata tinggi tanaman tertinggi (86,77 cm) diikuti perlakuan P 2 yaitu pangkasan 25 cm dari pangkal batang (80,38). Perlakuan P 1 juga memberikan jumlah anakan per rumpun tertinggi (105,71), jumlah gabah isi per malai tertinggi (112,63) dan berat gabah 1000 biji tertinggi (19, 72). Sedangkan pada parameter pengukuran jumlah gabah hampa per malai, perlakuan tinggi pangkasan batang 30 cm dari 136