[EFFECTS OF PALM OIL SLUDGE SUBTITUTION FOR SYNTHETIC N FERTILIZER ON GROWTH AND YIELD OF SWEET CORN]. Palm oil sludge (POS) contains high concentrations of organic nitrogen dan its can serve as an alternative for synthetic nitrogen fertilizer. Objective of this study was to compare the growth and yield of sweet corn as amended with different compositions of synthetic N fertilizer and palm oil sludge. Six compositions, each containing 138 kg N/ha were assigned as the treatment and arranged in a randomized complete block design with three replications. These were 100% synthetic fertilizer, 80% synthetic fertilizer + 20% POS, 60% synthetic fertilizer + 40% POS, 40% synthetic fertilizer + 60% POS, 20% synthetic fertilizer + 80% POS, and 100% POS. The results of this study indicated that the plot amended with 60% synthetic fertilizer + 40% POS produced the highest plant stature (176.4 cm), stem diameter (2.40 cm), leaf area (8712.82 cm2 ), plant fresh weight (375.19 g), plant dry weight (136.68 g), and husked ear length (17.93 cm). However, the highest observed husked ear yield was only about 61.6 % the yield potential of the sweet corn variety.

[THE IMPACT OF PALM OIL SLUDGE RESIDUES AND DOLOMITE RESIDUES ON GROWTH AND YIELD OF PEANUT (Arachis hypogaea L.) IN ULTISOL].  This study aims to determine the best interaction between palm oil sludge (POS) residues and dolomite residues, determine the best POS residue, and determine the best dolomite residue in the growth and yield of peanut plants. This research was conducted from March 2018 to June 2018, the design used was a Complete Randomized Block Design (RCBD) with two factors. The first factor is POS residue with 3 levels, 0, 10, and 20 tons/ha. The second factor is dolomite residue with 4 levels, namely 0, 2, 4, and 6 tons/ha. The results showed that the best treatment combination was obtained from oil POS residue of 10 tons/ha and dolomite residue of 2 tons/ha which produced the highest total root nodule weights of 0.2417 g. POS residue of 20 tons/ha gives the highest yield on the growth component, which is an average plant height of 16.72 cm. POS residue of 10 tons/ha gave the highest yield on the growth component, namely dry stover weight of an average of 9.57 g, as well as the yield component of 45.20 total pods, 32.84 pods, total pod weight 43.47 g, and the weight of pith pods weighing 36.60 g. The highest total dry pod weight was 2.71 tons/ha. Dolomite residue gave a higher yield on all growth variables and observed results, with the highest total dry pod weight being 2.68 tons/ha.

The low quality of Entisol is caused by low availability of nitrogen, phosphorus, and potassium as well as low soil pH, so the addition of vermicompost is necessary. The purpose of this study was to determine the effect of vermicompost application on soil quality and to obtain the highest vermicompost dosage on the availability of nutrients such as N, P, K, and the yield of corn. The field experiment used a Randomized Completely Block Design (RCBD) with 7 dosages of vermicompost and three replications. The treatments were V0 = 0; V1 = 5; V2 = 10; V3 = 15; V4 = 20; V5 = 25; V6 = 30 Mg ha-1. Variables observed consisted of 1) initial soil and vermicompost characterization analysis, 2) soil analysis and N, P, and K content in leaves, and yield of corn. The results showed that Entisol was classified as low quality; however, vermicompost quality complied with the requirements of quality organic fertilizer. The experiment also indicated that the highest pH of Entisol (5.31) and K content in corn leaves (2.12%) were obtained at a dose of vermicompost 25 Mg ha-1. Meanwhile, the highest weight of husked corn cobs (415.55 g plant-1) and weight of unhusked corn cob (351.11 g plant-1) were obtained at a vermicompost dose of 15 Mg ha-1.

Sweet corn is a very popular agricultural commodity in Indonesia, so the production of sweet corn needs to be increased. One of the problems that often encountered in the field is the lack of availability of fertile land that can support the growth of sweet corn. Therefore it needs technology to increase land productivity. In this case, the use of palm oil sludge as a source of organic matter and dolomite as a material that can improve soil fertility. The purpose of this research is to get the dosage of palm oil sludge and dolomite that optimal for the growth and yield of sweet corn. This research was conducted from December 2017 to March 2018 in Air Sebakul Village, Talang Empat Subdistrict, Central Bengkulu using Randomized Completely Block Design with two treatment factors. The first factor is the dosage of palm oil sludge consisting of three levels, namely 0 tons ha-1, 10 tons ha-1, and 20 tons ha-1. The second factor is dolomite dosage consisting of four levels, namely 0 tons ha-1, 2 tons ha-1, 4 ton ha-1, and 6 ton ha-1so that 36 sample units are obtained. The results showed that the best combination was obtained from 10 ton ha-1 palm oil sludge and 3,61 tons ha-1 dolomite, which was able to produce the diameter of corn crop stalks of 1,98 cm. The single palm oil sludge treatment gave no significant effect on all growth and yield variables. The addition of dolomite dosage up to 6 tons ha-1 was able to increase plant height, total leaf area, the weight of corn without cornhusk, length of corn without cornhusk, a diameter of corn without cornhusk, fresh weight of the plant, and dry weight of the plant.

Penggunakan benih lokal yang ditanam secara terus menerus telah menyebabkan produksi rendah. Upaya untuk meningkatkan produktivitas cabai yaitu dengan menggunakan benih hibrida unggul yang memiliki produktivitas yang tinggi, umur panen genjah, memiliki daya tahan terhadap hama dan penyakit, dan buah yang disukai para konsumen serta daya adaptasi lingkungan yang tinggi. Rancangan Percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) pola faktorial, yang terdiri atas 2 faktor. Faktor pertama adalah jenis pupuk terdiri atas 3 jenis yaitu : NPK Mutiara (16:16:16) = 300 kg/ha, Urea+KCl+TSP = 250 kg/ha+500 kg/ha+400 kg/ha, ½ dosis Urea+½ dosis KCl+½ dosis TSP+½ dosis NPK Mutiara (16:16:16) = 125 kg/ha+250 kg/ha+200 kg/ha+150 kg/ha. Faktor kedua adalah Varietas cabai hibrida terdiri atas 3 varietas yaitu : UNIB C H73, UNIB C H65 dan, UNIB C H13. Dari kedua faktor tersebut diperoleh 9 pasang perlakuan, diulang 5 kali sehingga diperoleh 45 satuan percobaan, yang terdiri atas 2 tanaman sehingga didapatkan 90 tanaman.Hasil penelitian menunjukkan bahwa aplikasi pupuk anorganik urea+KCl+TSP menghasilkan jumlah buah total tertinggi pada varietas UNIB C H65. Aplikasi pupuk anorganik Urea+KCl+TSP menghasilkan tinggi tanaman yang lebih tinggi dari aplikasi pupuk anorganik lainnya, dengan umur berbunga yang lebih cepat dibandingakan aplikasi pupuk anorganik lainnya. Aplikasi pupuk anorganik pada varietas UNIB C H73 menghasilkan diameter batang lebih besar, umur panen yang relatif cepat, panjang tangkai buah lebih panjang, panjang buah terpanjang dan bobot buah segar terberat dibandingkan varietas lainnya.