Aplikasi Pemberian Pupuk NPK dan Pengaturan Air terhadap P-Tersedia, Serapan P dan Hasil Padi Sawah (Oryza Sativa L.) pada Inceptisols Asal Jatinangor

This research was conducted to find out the effect of application NPK compound and water regulation on soil phosphorus, P uptake and yield of rice (Oryza sativa L.) on Inceptisols. The study was conducted from in late May to October 2015. at the field station of soil and water management, Soil Science and Land Resources Department, Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang. The experimental design used was Randomized Block Design (RBD) with ten treatments and three replications, consisted of : without treatment (control), waterlogged 5 cm; 150 kg Ha-1, waterlogged 5 cm; 300 kg Ha-1, waterlogged 5 cm; 450 kg Ha-1, waterlogged 5 cm; 600 kg Ha-1, waterlogged 5 cm; 750 kg Ha-1, waterlogged 5 cm; local recommended dosage, waterlogged 5 cm; 450 kg Ha-1, macak-macak; 450 kg Ha-1, intermittent 1 day, macak-macak; 450 kg Ha-1, intermittent 3 days, macak-macak. The results showed that there were effect of soil phosphorus, P uptake and yield of Rice on Inceptisol. Suppy NPK dose of 750 kg ha-1 were waterlogged 5 cm provides the highest content of available P amounted to 51.88 ppm P, P uptake of 0.93% and the highest yield of 9.24 kg.ha-1.

Potensi Bakteri Pereduksi Sulfat dan Jenis Bahan Organik dalam Pengolahan Air Asam Tambang menggunakan System Constructed Wetland Tanaman akar Wangi (Vetiveria zizanioides L)

Acid mine drainage (AMD) is a waste product from coal mining process. Acidic waste will impose a serious environmental issue such as organism annihilation and destruction of environmental ecosystem. Proper AMD management is required in order to restore polluted water to the proper standard condition. The Constructed Wetland system with Akar Wangi (Vetiveria zizanioides L.) and various organic growth medium compositions and sulphate-reducing bacteria and the composition of the media for several types of organic matter with sulfate-reducing bacteria (SRB) inoculation as stimulant was deemed a promising solution. This study was designed in randomized block design (RBD) consisted of nine treatments with three replicates. The treatments were: (A) = without organic matter and without SRB inoculation (control), (B) = 100% compost, (C) = 100% sawdust, (D) = 50% compost + 50% sawdust, (E ) = no organic matter + SRB inoculation (105 MPN ml-1), (F) = 100% compost + SRB inoculation, (G) = 100% sawdust + SRB inoculation, H = 50% compost + 50% sawdust + SRB inoculation, I = 75% compost + 25% sawdust + SRB inoculation. Results showed that 100% compost and SRB application increased polluted water pH. Application of 100% sawdust with or without SRB inoculation gave the highest reduction in sulfate content. SRB also has the potential to increase the height of Akar Wangi plant.

Aplikasi Pupuk Urea, Pupuk Hayati Penambat Nitrogen Dan Amelioran Untuk Meningkatkan pH, C-Organik, Populasi Bakteri Penambat Nitrogen dan Hasil Jagung pada Inceptisols

Inceptisols is known as one of the less-fertile dryland soil order that is widely used for corn cultivation. Proper type and dose of fertilizer can overcome the plant nutrition deficiency and increase corn yield in Inceptisols. This research aimed to examine whether the application of Urea with different doses, N-fixing biofertilizer and ameliorant can affect pH, Organic C, N-fixing bacteria population, and corn yield. The research was conducted at Balai Pengembangan Benih Hortikultura dan Aneka Tanaman Pasir Banteng, Jatinangor from January to June 2020. This research used Randomized Block Design with 16 treatments. The result showed that application of Urea with different doses, N-fixing biofertilizer and ameliorant significantly affected N-fixing bacteria population and corncob weight. 40% dose of Urea and 2 ton ha-1 ameliorant gave the best increase in corncob weight per plant of Bisi-2 by 345 g.

Pengaruh Aplikasi Mikoriza dan Bahan Pembenah terhadap Sifat Kimia dan Serapan Fosfor di Tanah Pasir

Sandy soil has limitations factor in supporting plant growth such as low soil organic carbon (SOC), cation exchange capacity (CEC), macro-micro nutrient content, water retention capacity, and high permeability rate. To improve soil conditions, it can be done by adding mycorrhizae and soil amendments. This study aimed to determine the effect of mycorrhizae application and soil amendments on the P availability and P uptake of plants in sandy soil. The research was conducted in a greenhouse of Agricultural Faculty, Sebelas Maret University. Used a completely randomized design consisting of 2 factors. The first factor was mycorrhizae with 2 levels, namely without mycorrhizae (M0) and mycorrhizae with 6 spores/plants (M1). The second factor was soil amendments; without amendment (P0), cow manure 60 tons/ha (P1), rock phosphate 150 kg/ha (P2), and combination of cow manure 60 tons/ha and rock phosphate 150 kg/ha (P3). The results showed that the application of mycorrhizae and soil amendments significantly increased available P, SOC, CEC, P concentration, and P uptake. Interaction of mycorrhizae 6 spores/plant and rock phosphate 150 kg/ha was able to increase the availability of soil P up to 12.8 times, plant tissue P concentration up to 1.4 times, and P uptake up to 2.27 times compared to the control. Application of mycorrhizae 6 spores/plant and cow manure of 60 tons/ha gave the best results on SOC and mycorrhizae with a combination of cow manure and rock phosphate gave the best results on CEC.

Inokulan Rhizobakteri untuk Meningkatkan Kelimpahan Mikroba Tanah, Klorofil dan Pertumbuhan Bibit Kelapa Sawit pada Inceptisols

Inorganic fertilizers are used intensively as the main source of essential nutrients to boost oil palms productivity. However, it’s also to contribute to degradation of organic matter and soil health. The research aimed to investigate the effect of rhizobacteria inoculant to increase the beneficial soil microbes (RNF= rhizobacteria nitrogen fixer and rhizobacteria phosphate solubilizes = RPS) in rhizobiome and the growth oil palm seedling was conducted from January to May 2020 on Inceptisols. The experiment was arranged as randomized block design, consisted of 9 treatments (control, 3, 6, 9, 12 kg ha-1 of RNF, and its combination with RPS and provided with 3 replicans. Observed respond were total bacteria, RNF, the seedling growth and chlorophyll content. The experimental results revealed that rhizobacterial inoculation had a significant effect on RNF, RPS, total bacterial population, and the chlorophyll content of oil palm seedlings. The abundance of soils microbes during the trial were rellative high (>108 CFU g-1). Inoculation of 3 kg ha-1 of rhizobacteria (RNF and RPS) increased the population of RNF to 4.02 x 108 CFU g-1. The highest of chlorophyll content (56.96 CCI) was obtained by the application 12 kg ha-1 of RNF, followed by applying of 3 kg and 9 kg of inoculant consortia (RFN + RPS), but not different significantly with the control. Results finding confirms that the application rhizocateria inoculant (RNF and its combination with RPS) could use to enhance the abundance of microbes in rhizobiome for supporting the growth of oil palm seedling

Pengaruh Kombinasi Pupuk NPK dengan Suplemen Pupuk Organik Cair terhadap Jumlah Bakteri dan Jamur Total di Rizosfer serta Hasil Tanaman Sawi Putih (Brassica pekinensis L.) pada Andisols Lembang

Large P fixation on Andisols can be overcome by adding P fertilizer into soil. However, to support good plant growth required the provision of nutrients N, K, micro nutrients and hormones. Research objective was to find out effect of NPK fertilizer with liquid organic fertilizer on total bacteria and fungi in the rhizosphere and plant yield of chinesse cabage (Brassica pekinensis L.) grown in Andisols. Experiment was conducted from March until May 2011 at experimental field of PT. Multiguna Indah Lestari, Kayu Ambon village, Lembang subdistrict, Bandung regency, West Java, with altitude of 1000 m above sea levels. The experimental design was Randomized Block Design with nine treatments and three replications which consisting of combination. The fertilizer rates were without treatment (A), 1dose of NPK (B), 1 dose of liquid organic fertilizer (C), 1 dose of NPK + ½ dose of liquid organic fertilizer (D), 1 dose of NPK + ½ dose of liquid organic fertilizer (E), ½ dose of NPK + 1 dose of liquid organic fertilizer (F), ½ dose of NPK + 1 dose of liquid organic fertilizer (G), 1 dose of NPK + 1 dose of liquid organic fertilizer (H), 1 dose of NPK + 1 ½ dose of liquid organic fertilizer (I). The results showed that NPK fertilizers and liquid organic fertilizer influenced total bacterial as well as fungi in the rhizosphere and plant yield of chinesse cabage. Fertilization treatments that demonstrated the best effect on both microbial population and chinese cabbage yield was application of ½ recommended dose of NPK with 1 recomended dose of liquid organic fertilizer gives the best result of 54,72 kg per plot (54,18 ton ha-1).

Efek Metoda Aplikasi dan Dosis Pupuk Hayati Penambat N terhadap Serapan N, Pertumbuhan dan Hasil Tanaman Padi pada Tanah Salin

Appropriate method and dosage of N-fixing biofertilizer are the keys to success in increasing N uptake, growth and yield of rice plants on saline soils. Research objectives: to obtain the application method and dosage of N-fixing biological fertilizers which gave the best effect on bacterial populations, N content, N uptake, growth (plant height and number of tillers), yield components (number of panicles per clump, number of grains per panicle, percentage of grain. content, and weight of 1000 grains) and rice yields on saline soils. The research was conducted in June-September 2018 at the BPP Cilamaya Wetan Experimental Garden, using a factorial randomized block design with 3 replications. The first factor is the method of applying N-fixing biofertilizers (300, 400, 700 g. ha-1) and the second factor doses of N-fixing fertilizer (500, 1000, 1500 g. ha-1). The results showed that the application of 1500 g.ha-1-fixing biological fertilizer had the best effect on bacterial populations, N levels, N uptake, plant height, number of tillers, number of panicles per clump, number of grains per panicle, percentage of filled grains, and 1000 grain weight, and increased rice yields on saline soil by 29.70%.

Pengaruh Pupuk NPK Majemuk terhadap N-Total, Serapan N, dan Hasil Umbi Bawang Merah (Allium ascalonicum L.) pada Inceptisols Asal Jatinangor

Shallot (Allium ascalonicum L.) is a horticulture commodity that has a lot of benefits and also prospective due its increasing demand. Annual shallot productivity in Indonesia is unstable due to nutrient degradation on agricultural land, therefore efforts are needed to promote the productivity of shallot. One of the solution using NPK fertilization. This experiment aimed to determine the effect of NPK compound fertilizer on N total, N-uptake, and shallot bulb yield. This research conducted at the Soil Chemical and Plant Nutrition Experiments Field, Faculty of Agriculture, Padjadjaran University, Jatinangor, from February to June 2019. The experimental design used was Randomized Block Design (RBD) consisted of one control treatment, one N, P, K single fertilizer treatment (250 kg ha-1 Urea, 125 kg ha-1 ZA, 200 kg ha-1 SP-36, and 250 kg ha-1 KCl), and eight NPK compound fertilizer treatments in various doses with three replications. The results showed that the NPK compound treatment affected the total N, N uptake, and shallot bulbs yield. Treatment of 75% NPK compound (675 kg ha-1) gave the highest results of fresh bulbs weight at 41.64 g/clump and dry bulbs weight at 25.27 g/clump.

Arsenic in Gold Mine Tailing and Agricultural Soil in Buru Island of Maluku

Contamination of heavy metal including Arsenic (As) due to mining activities decreased ecosystem quality. The objective of this study was to determine the arsenic level of tailing and agricultural soil, and evaluate the spatial distribution of As in closed gold mine and nearby agricultural area in Buru Sub-district of Maluku. Tailing and soil samples were taken by purposive method based on mining and agricultural activities. Arsenic level in tailing and soil samples was determined by Atomic Adsorption Spectrophotometer after mixed acid extraction. The study showed that gold mine increased As level in the top soil and tailing but soil of nearby agricultural area was not contaminated by As. Increased concentration of As in tailings has been verified. pH level of the agricultural area was neutral hence lowered As availability for plant.

Efisiensi Pupuk dan Peningkatan Hasil Padi Gogo dengan Aplikasi Pupuk Hayati dan Arang Tempurung Kelapa

The intensive application of inorganic fertilizers has a negative impact on soil health. Furthermore, the price of inorganic fertilizers has increased hence the production costs will also increase. Efforts to improve fertilizer efficiency and encourage environmentally friendly crops can be done by application of biofertilizers and organic ameliorants. The field experiment has been carried out to study the effect of biofertilizers application and coconut shell charcoal to increase inorganic fertilizers efficiency and yield of upland rice at Rancakalong, Sumedang, West Java. The experiment used factorial randomized block design consisted two factors. The first factor were biofertilizers and coconut shell charcoal and the second factors were inorganic fertilizers doses. Biofertilizers with consortia of Azotobacter chroococum, Azospirillum sp., Pseudomonas mallei, Burkolderia sp., Aspergillus niger, and Penicillium sp. and organic ameliorant was coconut shell charcoal. NPK fertilizers were applied in 25%, 50%, 75% and 100% of recommended doses. The results revealed that biofertilizers and coconut shell charcoal increased growth and yield of upland rice. This finding concludes that applica