Shallot cultivation in Lampung faces challenges because the land is dominated by ultisol soils, which have low nutrients. Therefore, soil improvement materials such as biochar and fertilizers are needed. This study aims to determine the effect of coconut shell biochar addition on the effectiveness of NPK fertilizer in the production of shallots. The study was arranged in a Factorial Completely Randomized Design consisting of 2 factors, namely the dose of biochar (0, 40, 80, and 120 g/pot) and the dose of NPK fertilizer (0, 0,8, 1,6, and 2,4 g/pot). Each treatment combination was repeated 3 times. Parameters included soil characteristics (pH, soil volume shrinkage) and plant parameters (plant height, number of leaves, canopy area, buld number and diameter, evapotranspiration, fresh root weight, bulb air dry weight, and water productivity. The results showed that coconut shell biochar had a significant effect (α = 0.05) in increasing soil pH and decreasing soil shrinkage. The dose of biochar 80 g/pot (B2) with a dose of NPK 1.6 g/pot (N3) was the best treatment. In this treatment combination, shallots produced an average weight of 120.54 g/pot of fresh stover, 14 bulbs with diameter of 2.05 cm and air dry bulb weight of 70.17 g/pot, and the water productivity of 18.22 kg/m3. Keyword: Canopy area, Fertilizer dose, pH, Soil shrinkage, Water productivity

This study aims to determine the effect of substrate composition on biogas productivity from a mixture of cow dung and rice straw using semi-continuous digester. Rice straw was taken from Way . Substrate mixture is then added with tap water to obtain a TS of 5%. Six digesters with a working volume of 30 L (labeled as P1 to P6) were filled with 26 liters of cow dung diluted with water at a ratio of 1:1. Digesters was left for 4 days for stabilization. Starting on day 5, prepared substrate mixture is added to the digester with a loading rate of 0.5 liter/day. The parameters in this study included daily temperature, pH, TS and VS content, daily biogas production, biogas productivity, and biogas quality. The results showed that the average pH for all treatments was almost same, namely 6,9-7,1. The average temperature of the digester in the morning is around 26°C, while around 29°C achieved at noon. Substrate composition of P4 shows the best results with cumulative biogas production of 448.15 L for 60 days of observation, and daily biogas production reached 9.1 to 9.5 L after a stable condition. The produced biogas has good quality because it shows a bright blue flame. ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh komposisi substrat terhadap produktivitas biogas dari campuran kotoran sapi dan jerami padi pada digester semi kontinyu. Jerami padi yang digunakan diambil dari Desa Way Galih, Lampung Selatan, dan kotoran sapi segar diperoleh dari Jurusan Peternakan, Fakultas Pertanian, Universitas Lampung. Kotoran sapi dan jerami padi dicampur dengan komposisi perbandingan TS masing-masing

The aim of this research is to know the effectiveness of intermittent irrigation and water productivity analysis, analysis of optimum irrigation interval on plant material of mixed

Pemanenan padi secara tradisional memerlukan banyak tenaga pemanen.  Penggunaan alat pemanen tradisional juga menjadi salah satu penyebab kehilangan hasil panen yang cukup tinggi.  Penggunaan alat mesin pemanen padi dapat dilakukan untuk memecahkan permasalahan tersebut.  Salah satu alternatif mesin yang dapat digunakan untuk memanen padi di lahan yang sempit/bergelombang adalah mesin pemotong padi (paddy mower).  Tujuan dari penelitian ini untuk mengetahui kapasitas kerja mesin, kebutuhan bahan bakar,  tingkat kehilangan padi (losses), serta analisis ekonomi penggunaan mesin pemotong padi tipe GLX 328-RH untuk pemanenan. Penelitian ini terdiri dari tiga tahapan utama, yaitu persiapan mesin dan lahan sawah di pekon Talang Padang, Kabupaten Tanggamus, pengujian performansi mesin dan analisis data.  Parameter yang diamati adalah kapasitas kerja mesin, persentase kehilangan gabah, dan konsumsi bahan bakar. Hasil penelitian menunjukan bahwa kapasitas kerja mesinpaddy mower dengan kecepatan pemotongan RPM 3863 (0,015 ha/jam) dan RPM 5000 (0,029 ha/jam) lebih tinggi dibandingkan dengan sabit (0,011 ha/jam).  Meningkatnya kecepatan pemotongan cenderung menurunkan losses gabah.  Losses pada RPM 1824 = 1,44%, RPM 3863 = 1,12 % dan RPM 5000 = 0,66%.  Konsumsi bahan bakar yang dibutuhkan pada RPM 1824 = 95,83 l/ha, RPM 3863 = 56,83 l/ha dan RPM 5000 = 42,83 l/ha.  Nilai Break Event Point (BEP) penggunaan mesin paddy mower sebesar 2,27 ha/thn.  NPV mesin paddy mower sebesar Rp. 2.881.194,18/thn, B/C Ratio mesin paddy mower sebesar 1,10, dan IRR mesin paddy mower sebesar 83,98%.Kata Kunci:Padi, Mower, Unjuk Kerja Mesin, Losses, Kapasitas Kerja