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All Journal Jurnal Penyuluhan Jurnal Natur Indonesia Journal of Tropical Soils Pengembangan Inovasi Pertanian BERITA BIOLOGI JURNAL PANGAN Jurnal Tanah dan Iklim
Dedi Nursyamsi
Balai Penelitian Tanaman Rawa, Jl. Kebun Karet Loktabat Utara, Banjar Baru, Kalimantan Selatan 70712
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Social Sciences

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Calibration of Soil Phosphorus Test for Upland Rice Grown on Typic Kandiudox, Way Pangubuan, Lampung Sutriadi, Mas Teddy; Setyorini, Diah; Nursyamsi, Dedi
JOURNAL OF TROPICAL SOILS Vol. 23 No. 2: May 2018
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2018.v23i2.81-89

Abstract

Calibration of soil P test was conducted for Typic Kandiudox derived from Way Pangubuan, Lampung. A field experiment was carried out in dry and wet seasons. The dry season experiment in 2013 was designed by applying various soil P status: 0 X (very low), ¼ X (low), ½ X (medium), ¾ X (high), dan X (very high), in which X was the amount of P required to obtain P concentration of 0.2 mg P L-1 in soil solution. The wet season experiment was conducted in 2013/2014 with the P treatments of P fertilizer at 0, 8, 16, 33, dan 66 kg P ha-1 in the form of SP-36 with 3 replicates. The results showed that Colwell, Morgan-Wolf, and Olsen extraction methods were not suitable to determine P requirement for upland rice grown on Typic Kandiudox. Extraction methods of Bray-1, Truog, Mehlich, HCl 25%, dan Bray-2 were appropriate to estimate P fertilizer requirement for upland rice. Among all of these extractions, Bray-1 and Truog were the most appropriate. The level of soil P availability extracted using Bray-1 were classified into low (< 12.0 ppm P2O5), medium (12.0-26.0 ppm P2O5), and high status (> 26.0 ppm P2O5), whereas soil P availability status extracted using Truog consisted of low (< 9.0 ppm P2O5), medium (9.0-15.5 ppm P2O5), and high (> 15.5 ppm P2O5).  Phosphorus fertilizer recommendation for upland rice grown on Typic Kandiudox with low, medium, and high soil P availability status were 33, 8, and 0-4 kg P ha-1, respectively, which equal to 200, 50, and 0-25 kg SP-36 ha-1, respectively.
The Role of Inundation Types of Tidal Swampland on the Chemical Properties of Potentially Acid Sulphate Soils under Fertilizer and Lime Application Fahmi, Arifin; Alwi, Muhammad; Nursyamsi, Dedi
JOURNAL OF TROPICAL SOILS Vol. 23 No. 2: May 2018
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2018.v23i2.55-64

Abstract

Generally, fertilizer application increases soil fertility, on the other hand fertilizer application leads to the alteration of soil chemical balances in which the magnitude of changes is determined by soil properties. The research aimed to study the soil chemical properties of potentially acid sulphate soils (PASS) originally from two types of tidal swampland as influenced by the application fertilizers and lime. A pot experiment was carried out in a glasshouse. Soil samples were taken from PASS originated from two types of tidal swampland, i.e. PASS in type B tidal swampland (PASS-B) and PASS in type C tidal swampland (PASS-C). The experiment was arranged in single factor of completely randomized design, consisting of six levels of urea, SP-36, and KCl fertilizers and lime that were determined based on Decision Support System software (DSS). Soil pH, total nitrogen (N), available phosphorus (P), exchangeable potassium (K) and iron (Fe) were measured periodically every four weeks, soil redox potential (Eh) was measured every week, leaf color index was measured every two weeks. The dynamics of soil pH, concentration of P, K, Fe and N of PASS were influenced by the application of fertilizer rates and lime, although, the magnitude of their changes were influenced by inundation type of tidal swampland. These facts were mainly associated with the presence of Fe mineral in both soils, the different concentration of Fe2+ in PASS-B and PASS-C may be related to land hydrological condition of type B tidal swampland that is frequently flooded as origin of PASS-B.
Soil Enzyme Activities and Their Relationship to Total Soil Bacteria, Soil Microbial Biomass and Soil Chemical Characteristics of Organic and Conventional Farming Aziz, Muhammad Abdul; Hazra, Fahrizal; Salma, Selly; Nursyamsi, Dedi
JOURNAL OF TROPICAL SOILS Vol. 23 No. 3: September 2018
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2018.v23i3.133-141

Abstract

Soil properties such as physical, chemical, biological, microbiological and biochemical aspects affect on soil quality. Soil microbiological activities directly affect stability of ecosystems and soil fertility. The research aimed to determine soil microbial activities through soil enzyme activities and their relationship to total soil bacteria, soil microbial biomass, and soil chemical characteristics. The research was conducted at Laboratory of Soil Microbiology, Indonesian Soil Research Institute, Bogor from July 2015 to January 2016. Soil samples 0-10 cm depth were taken from organic and conventional farming of some commodities (tomato, carrot, maize, broccoli) from Bogor Regency, while those of rice were taken from Tasikmalaya Regency. Soil dehydrogenase, urease and cellulase activities were determined using some modified methods. The results showed that soil dehydrogenase and cellulase activities in organic farming were higher than those in conventional farming, whereas the soil urease activity in organic farming was lower than that in conventional farming. The total soil bacteria and soil microbial biomass were significantly and positively correlated with soil dehydrogenase, urease, and cellulose activities. Soil dehydrogenase, urease, and cellulose activities were very significantly and positively correlated with all soil characteristics tested, i.e. soil organic C, total N, potential P and K, available P and K, CEC, and pH, except that soil urease activity was very significantly and negatively correlated with soil pH. The results of this research indicated that organic farming is recommended for maintaining soil fertility and plant productivity; however, small use of urea fertilizer is still needed in the farming.
Co-Authors . Nurjaya A. BUDIARTO Agus Sofyan Ani Susilawati Anny Mulyani Ardiwinata, Asep Nugraha ARIFIN FAHMI Atang Sutandi Betty Natalie Fitriatin Budi Nugroho D.A RACHIM DIAH SETYORINI Eddy William Eni Maftuah Fahrizal Hazra Haris Syahbuddin Herman Subagyo Irsal Las K. Idris Koesrini, . Koesrini, Koesrini Komaruddin Idris L. ANGGRIA Mikhael Muhammad Alwi Muhammad Noor Muhammad Saleh Nur Wakhid Nurita, . R S Simatupang, R S Rachim, Djunaedi Abdul Reginawanti Hindersah RR. Ella Evrita Hestiandari Selly Salma Siti Nurzakiah SUPIYANDI SABIHAM Sutriadi, Mas Teddy Wahyuda Rachman, Wahyuda Wihardjaka, Anicetus Zakiah, Siti Nur