Beras merupakan makanan pokok di Indonesia. Beberapa varietas padi gogo unggul baru telah dilepas dan perlu dilengkapi pemupukan yang akurat di lokasi tertentu. Salah satu jenis pupuk tersebut adalah nitrogen (N). Penelitian ini bertujuan untuk mengetahui efisiensi penggunaan N pada padi gogo IPB 9G sebagai respon terhadap dosis pupuk N. Dosis pupuk yang diaplikasikan adalah 0, 46, 92, 138, dan 184 kg N ha-1 dalam bentuk urea (46% N). Percobaan dilakukan menggunakan rancangan acak kelompok dengan 3 ulangan di Darmaga, Bogor pada Maret-Juli 2018. Petak percobaan berukuran 3.5 m x 3.0 m. Padi gogo ditanam dengan jarak 50 cm x 10 cm. Efisiensi penggunaan N dinilai dari pertumbuhan padi, serapan N, efisiensi agronomi dan fisiologis. Peningkatan tinggi tanaman dan jumlah anakan mengikuti peningkatan dosis N. Serapan N dan hasil gabah memiliki respon kuadratik terhadap dosis N dan dapat menjadi indikator efisiensi pemupukan N. Serapan N dan hasil gabah yang maksimum diperoleh dari dosis pupuk N yang hampir sama, rata-rata 143.8 kg N ha-1 (312.5 kg urea ha-1). Untuk efisiensi pemupukan N padi gogo IPB 9G pada tanah dengan N total sedang (0.27%) di musim kering dapat diaplikasikan 143.8 kg N ha-1 (urea 312.5 kg N ha-1). Kata kunci: efisiensi agronomis, efisiensi fisiologis, hasil biji, serapan N
A study was conducted to determine the optimum rates of N, P, K fertilizers on “IPB 9G” upland rice variety from March to July 2018 at the Sawah Baru Experimental Field of IPB University, West Java, Indonesia. Three paralel experiments were carried out in a randomized complete block design to test five fertilizing levels, i.e. 0, 50, 100, 150 and 200% of the reference rate. The reference rates of fertilizer application are 100% N = 200 kg Urea ha-1, 100% P = 100 kg SP36 ha-1, and 100% K = 100 kg KCl ha-1. The applied fertilizers were Urea (46% N), SP36 (36% P2O5) and KCl (60% K2O). Fertilizers were applied three times, 40% at planting, 30% at 4 WAP and the rest 30% at 8 WAP; 100% P and 100% K were applied at planting. Increasing N fertilizer from 0 to 200% of the reference rate increased plant height, dry weight biomass at heading and at harvest, number of productive tillers, harvest index, and grain weight per clump. P increased dry weight of the above ground biomass, whereas K fertilizer increased the leaf area, canopy dry weight, number of grain per panicle, panicle length, harvest index and grain weight per clump. The optimum rate of N and P were 107.09 kg Urea ha-1 and 63.3 kg P2O5 kg.ha-1, respectively, whereas the optimal rate for K fertilizer for “IPB 9G” could not be determined with this study.
The study aimed at evaluating the effect of supplementing concentrate containing fermented corncob (TTJF) and Zn bio-complex on kacang goat performance. There were 12 kacang does 6-8 months of age with 9,3-15,5 averanging 11,20 kg and CV 13,30%. initial body weight used in the study. Completely randomized design 4 treatment diets offered were: R0 : concentrate feed without fermented corncob + 2,06g Zn bi-complex, R1 : concentrate feed containing TTJF 10% + Zn-Biokomplex 2,06g; R2 : concentrate feed containing TTJF 20% + Zn-Biokomplex 2,06g and R3: concentrate feed containing TTJF 30% + Zn-Biokomplex 2,06g. Data were analyzed using Analysis of Variance (ANOVA). The results of all variables measured were : R0 daily body weight gain (52.21g), R1 (66.16g), R2 (46.17g), R3 (42.09g), daily body length gain: R0 (0.17cm), R1 (0.20cm), R2 (0.18cm), R3 (0.14cm), daily girth cycle gain R0 (0.22cm), R1 (0.27cm), R2 (0.23cm), R3 (0.19cm) and daily body height R0 (0.15cm), R1 (0.18cm), R2 (0.15cm), R3 (0.13cm). Statistical analysis shows that the effect of supplementing containing fermented corncob concentrate with Zn bio-complex is not significant (P>0.05) on all performance variables measured. The conclusion is that supplementing containing fermented corncob concentrate up to 30% with Zn bio-complex performs the relative results in kacang does growth performances. Keywords: kacang goats, corncob, growth, Zn bio-complex
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