bluuebunny/crossref_metadata_2025_split huggingface dataset:
The potency of sub-micron dolomite in reducing yellow latex contamination in mangosteen fruits
Authors: Martias  , Sparta A , Hendri  , Fatria D , Marlina L , Mansyah E 
Published: February 2021

AbstractIn Indonesia, mangosteen has high potency as an export commodity, but the qualityof the fruit is low. Yellow latex contamination is the the main problem in mangosteen fruit quality. The purpose of this research was to study the potency of sub-micron dolomite to reduce yellow latex contamination. This research was conducted in Guguk district, Lima Puluh Kota regency, West Sumatera province, Indonesia, from June 2016 until March 2017. In this experiment, the productive mangosteen trees (12 years) were used as plant material. This study was arranged in Randomize Complete Block Design, and the treatments were the dosage of sub-micron size of dolomite (30, 60, 90, 120, 150 g per plant). Each unit of treatments consists of three plants and four replications. The results showed that the application 90 g per plant of sub-micron dolomite fertilizer increased Ca level in mangosteen leaves and reduced yellow latex contamination until 19.78%. Application sub-micron dolomite fertilizer above 90 g per plant also tend to reduce the Ca level in mangosteen leaves and increased the yellow latex contamination. While the application 120 g per plant sub micron dolomite increased Mn level in mangosteen leaves, an increase the dosage of sub micron dolomite above 120 g per plant reduced Mn level in mangosteen leaves.
The ability of some microbes to solubilize the hardly soluble phosphorous and potassium from various sources in vitro
Authors: Flatian A N , Anas I , Sutandi A , Ishak  
Published: February 2021

Abstract
Utilization of bio-fertilizer is an alternative option to maintain the available phosphorus (P) and potassium (K) in the soil. To develop such a bio-fertilizer, the ability of microbes to solubilize phosphate and potassium is one of the most important things. A set of experiments was conducted to evaluate the ability of some microbes (7 bacteria and 7 fungi isolates) to solubilize the hardly soluble P (Ca3PO4, AlPO4, FePO4 and Blora rock phosphate) and K (Malang feldspar) sources in vitro. The results showed that the solubilization rate of hardly soluble P and K sources by microbes are different depending on isolates type and sources applied. The amounts of P released from Ca3PO4, AlPO4, FePO4 and rock phosphate in liquid medium were significantly increased by the isolates, respectively up to 8.8, 69.3, 928, 26 times more than the control (un-inoculated). Some of them also significantly increased the solubility of the K containing mineral (feldspar), up to 2.3 times more than the control. Acidification of the medium has been observed to be the most important mechanism for the P and K solubilization, especially for Ca3PO4, AlPO4. The JK1 fungal isolate was the most promising phosphate-potassium solubilizing microbe.
Addition of biochar to urea and urine fertilizer for improving soil chemical properties and maize yield in acid upland, East Lampung
Authors: Nurida N L , Septiana  
Published: February 2021

Abstract
Some studies have shown the ability of biochar in nutrient retention, including N such as urea and urine. The objective was to evaluate the effect of addition of biochar to urea/urine on the soil chemical properties and maize yield in acid upland East Lampung. The study was conducted at the Research station of Indonesian Soil Research Institute, East Lampung, from February to May 2016. The study used a randomized block design 4 replications, with treatments: 1) urea, 2) biochar (BC) + urea, 3) BC + urea (dissolved), 4) BC + urine and 5) urine. The parameters measured were soil chemical properties and maize yields. The results showed that the addition of biochar on urea and urine had soil chemical properties significantly better than without biochar. Urine could be applied with biochar. The highest dry grain was obtained from BC + urea (7.49 t ha−1) and dissolved BC + urea (7.15 t ha−1) compared to the others treatment (5.11 to 6.05 t ha−1). The application of BC + urine had a higher dry grain 12% compared to the urine without biochar treatment. Application of BC + urea, whether dissolved or not, is more effective to be applied in acid upland in East Lampung because it has soil chemical properties and yield better than BC + urine.
Effect of differences in soil tillage and application of organic fertilizers on soil water content and yield of upland rice
Authors: Barus J , Pujiharti Y , Endriani  , Novitasari E 
Published: February 2021

Abstract
The research objective was to increase upland rice yield and balancing it with efforts of land conservation to maintain sustainable land productivity. It has been conducted in the research station of Lampung Assessment Institute for Agricultural Technology (AIAT). The treatments were arranged in a factorial randomized block design with three replications. The treatment in the main plot was the method of tillage whereas the subplot was organic fertilizers. The tillage methods were: (1) Maximum tillage and without ditch, (2) Minimum tillage with ditch. The organic fertilizer treatments were control, bio urine plus 10 L ha−1, bio urine plus 20 L ha−1, biodecomposer 10 L ha−1, and biodecomposer 20 L ha−1. The upland rice variety was Inpago 12. The variables observed were soil water content, growth and yields of rice. The results showed that the minimum soil tillage with ditch provided a higher soil water content than the maximum tillage. Likewise, the application of liquid organic matter from local microorganisms (biodecomposer) increased soil water content compared to the control. Application of bio urine plus 20 L ha−1 significantly increased plant height and yield. The highest dry grain was obtained in the treatment of minimum tillage and biodecomposer 20 L ha−1.
Nutrients balance under organic rice farming system in Central Java, Indonesia
Authors: Setyorini D , Hartatik W 
Published: February 2021

AbstractUnderstanding and calculation the net nutrient balance in an organic rice farming system is crucial to determine its ability to maintain soil fertility in the long term. The objective of this study is to calculate simple nutrient balances of nitrogen (N), phosphorus (P), and potassium (K) under different sources of organic fertilizer in organic rice farming. The results indicated an imbalance between nutrients, a general surplus for P budget +0.8 to +43.5 kg ha−1season−1and deficit for N budgets from -49.2 to +38.5 kg ha−1season−1; and K -56.8 to +38.6 kg ha−1season−1. The application of 5t ha−1of chicken manure combined with 500 kg ha−1of azolla and 2 t ha−1of straw compost gave better growth, yield and positive N, P, K balance for local rice variety Mentik Wangi.
Effectiveness of the combination of organonitrofos and inorganic fertilizers on soil chemical properties and the yields of cucumber (Cucumis sativus L.) in Ultisols
Authors: Dermiyati  , Aprilia E , Hendarto K , Yuwono S B , Ginting Y C 
Published: February 2021

Abstract
Ultisols has constraints in low organic matter, low pH, low CEC, and low soil nutrients. This study aimed to determine the effect of applying a combination of Organonitrofos and inorganic fertilizers on soil chemical properties and yields of cucumber plants in Ultisols. The study consisted of 11 combinations of Organonitrofos and inorganic fertilizers with 3 replications arranged in a randomized block design. A recommended dose of 100% Organonitrofos fertilizer which was 10,000 kg ha−1 and 100% NPK inorganic fertilizer (Urea = 448 kg ha−1; SP-36 = 413.5 kg ha−1; KCl = 63.3 kg ha−1) were applied. The treatments were various combinations of Organonitrofos and inorganic fertilizers of 0, 25, 50, 75 and 100% from each fertilizer recommendation. The application of a combined Organonitrofos and inorganic fertilizers increased pH and soil available-P, but it did not affect the total-N and organic-C of soil. All combined doses of Organonitrofos and inorganic fertilizer significantly increased all the growth and yields variables of cucumber compared to control (without fertilizer) and application of Organonitrofos fertilizer only. Application of 100% Organonitrofos + 50% NPK was the most economically effective dose because it had the highest RAE value of 101%.
The use of soil ameliorants to improve soil quality and crop productivity of degraded semi-arid upland in Gunung Kidul, Yogyakarta, Indonesia
Authors: Dariah A , Nurida N L , Salma S , Nurjaya  , Santi L P 
Published: February 2021

Abstract
Optimization of degraded semi-arid upland needs to be done by improving soil fertility and quality, as well as increasing plant resistance to drought. The purpose of this research is to evaluate the effect of balanced fertilization and soil ameliorant on soil quality and crop productivity. The study was conducted on degraded semiarid upland in Gunung Kidul Regency, Yogyakarta, Indonesia at the beginning of the dry season in 2018. Randomized block design with five treatments and four replications was applied. The treatments consisted of TP: control (farmer management), T1: Balanced fertilization recommendation, T2: T1+Biochar SP-50, T3: T1+Bio-silica, T4: T1+Biochar SP-50+Bio-silica, and T5: T1+Vulkanorf K-424. Soil ameliorant treatment had a positive effect on water aggregate stability. Treatment of Biochar SP-50 in combination with Bio-silica had a positive effect on soil bulk density, aeration pore, and water availability pore. Balanced fertilization accompanied by Biochar SP-50 (without and with bio-silica) gave a positive effect on the content of soil organic C and K-potential. Plant growth of balanced fertilization+Biochar SP-50 was significantly higher than other treatments, while maize production among treatments did not show a significant difference. Therefore, it requires long-term and continuous treatment to improve soil quality and crop productivity in degraded land.
Red chili performance in acid upland applied with biofertilizer
Authors: Pramudyani L , Sabur A , Yasin M , Yani W 
Published: February 2021

Abstract
Conventional red chili farming systems using inorganic fertilizer cause to overcome this problem, alternative technologies. The purpose of this study was to determine the effect of biofertilizer on the growth and yield of red chili in acid upland. The experiment was conducted in Harapan Masa Village, Tapin District, South Kalimantan from May 2016 to December 2016. The Pillars variety was used because of the high production. The study was arranged using a randomized block design with 4 treatments and 5 replications. The treatments consist of Po = manure application without biofertilizer + NPK fertilizer at a dose of 100%, P1 = manure application with biofertilizer + NPK fertilizer at a dose of 100%, P2 = manure application with biofertilizer + NPK fertilizer with a dose of 75%, P3=manure application with biofertilizer + NPK fertilizer at a dose of 50%. Variables observed included percentage of seedling death, plant height, fruit length, fruit diameter, percentage of death plants and crop production. The results showed that the use of biofertilizer on manure used + NPK fertilizer can increase plant height, fruit length and production of chili plant in acid upland also decrease the percentage of death plant.
Preliminary study of methane oxidizing bacteria isolation and selection on three rice agroecosystems
Authors: Adriany T A , Santoso A A , Akhdiya A , Wihardjaka A 
Published: February 2021

AbstractThe agricultural sector contributes to releasing methane (CH4) as greenhouse gas emissions from lowland rice cultivation. One effort to reduce CH4emissions in paddy fields is the utilization of methane-oxidizing bacteria from paddy fields. The study aimed to obtain isolates of methane oxidizing bacteria from isolating and selecting their oxidation ability on three rice agroecosystems. The research was conducted at the Laboratory of the Indonesian Agricultural Environment Research Institute (IAERI), Pati, Central Java, Indonesia. Soil sampling was carried out in three rice agroecosystems, namely technical irrigation (SI), rainfed (TH), and organic rice cultivation (OF) rice fields in Pati Regency. Isolation and purification of bacteria used Nitrate Mineral Salts (NMS) with 1% methanol. Parameters collected were characteristics of morphology colonies, staining of gram bacteria and measuring methane oxidation ability. The results obtained 15 bacterial isolates from three different rice agroecosystems. The highest percentage of CH4concentration reduction from three rice different agroecosystems during 15 days of incubation were SI5 16, TH6 23, and OF3 23%, respectively. Methane oxidizing bacteria are expected as a technology to reduce CH4emissions from rice fields.
Application of biochar to improve maize performance on volcanic and sediment soil based parent materials in dry land
Authors: Krismawati A , Arifin Z , Hermanto C , Tafakresnanto C 
Published: February 2021

Abstract
The study had been conducted in two dry land sites in East Java, where first site was in Situbondo District (volcanic soil), and the second in Sampang District (sediment soil) during the dry season I, 2018. The research was designed in RBD, 3 replicates, and 9 treatments, namely : A = FAF + 1,000 kg organic fertilizer ha−1, B = FAF + 1,000 rice husk biochar ha−1, C = FAF + 1,000 corn cob biochar ha−1, D = FAF + 500 g biofertilizer ha−1, E = RRIF, F = RRIF + 1,000 kg organic fertilizer ha−1, G = RRIF + 1,000 kg biochar rice husk biochar ha−1, H = RRIF + 1,000 kg corn cob biochar ha−1, and I = RRIF + 500 g biofertilizer ha−1. The results showed that the application of RRIF + 1,000 kg corn cob biochar ha−1 in Situbondo District obtained dry seeds yield of corn 7.87 t ha−1 (increased 36.16%), C-organic (increased 19.40%), soil CEC (increased 62.27%) from the RRIF and R/C ratio 2.28, while in Sampang District obtained of dry seeds yield of corn 7.63 t ha−1 (increased 28.89%), C-organic (increased 46.51%), soil CEC (increased 22.98%) from the RRIF and R/C ratio 2.17.
Ameliorant engineering to elevate soil pH, growth, and productivity of paddy on peat and tidal land
Authors: Saputra R A , Sari N N 
Published: February 2021

Abstract
To support the government’s program towards world food barns in 2045, the use of sub-optimal wetlands such as peatlands and tidal land is a viable alternative. The problem of acidity in both types of land can be controlled, one of which is by providing ameliorant. Thus, the purposes of this study were to examine the effect of ameliorant application in increasing soil pH, as well as its influence in increasing the growth and production of paddy plants. The study was conducted using a nested factorial completely randomized design. The factors were soil (peat soil/l1 and tidal swampland/l2) and ameliorant types (without ameliorant/p0, dolomite/p1, chicken manure/p2, paddy husk ash/p3, paddy husk charcoal/p4, and baglog oyster mushroom waste/p5) that given 10 t ha−1 each. The results showed that all ameliorants applied could increase soil pH, growth, and paddy yield. Dolomite, chicken manure, and baglog oyster mushroom waste significantly elevated the pH of peat and tidal soils. The highest paddy productivity was at chicken manure application. The application of ameliorant increased soil pH to be suitable pH for paddy growing on peat and tidal soils.
Residual effects of rock phosphate on soybean growth at tidal swampland South Kalimantan
Authors: Husnain  , Djufry F , Yusuf W A , Siregar A F , Nassir A 
Published: February 2021

Abstract
Phosphorus fertilizer application could be an option to improve soybean yield in Indonesia. As in tidal swampland, phosphate deficiency is one of the main obstacles in the soil because it fixates ferro as insoluble phosphates. This experiment aimed was to determine the residual effects of Reactive Phosphate Rock (RPR) in the second cropping season on soybean growth in tidal swampland of South Kalimantan. The experiment was conducted at Barambai Village, South Kalimantan. This study was set in a factorial randomized block design with sixth treatments and three replications. The treatments were farmer practice, P Fertilizer (SP 36), residual of RPR, residual of RPR with soluble P Bacteria, residual of RPR with mycorrhiza, residual of RPR with Rhizobium and Soluble P Bacteria. The residual effect of RPR treatments with rhizobium and soluble P bacteria in the second planting season gave higher plant height of soybean compared to farmer practice and SP 36 treatment. The residual effect RPR treatment with rhizobium increased soybean yield up to 40.9% compared to without RPR and microbe in second cropping season. The released soluble P derived from RPR is relatively slow, therefore the application of high-dose RPR increases crop production.
Does biochar enhance soil organic matter formation in tropical soils?
Authors: Schnee L S , Ngakou A , Filser J 
Published: February 2021

Abstract
Tropical soils are often deeply weathered and vulnerable to degradation. Biochar is a promising means to improve physico-chemical characteristics such as pH or bulk density. Sustainable soil amelioration is best achieved by improving biological activity, resulting in enhanced soil organic matter (SOM) stocks. In a meta-analysis, we investigated, if biochar amendment to tropical soils led to native SOM stock increases. We found a mean additional C accumulation (MAC) of 0.29% soil dry weight (% dw). MAC was independent of study duration, climate, and biochar addition rate, but strongly linked to soil type and nutrient status prior to the experiment: In Nitisols, MAC was highest (0.99% dw) and initial C and N contents were higher in these soils. MAC was negative in Ferralsols and Oxisols (–0.01% dw and –0.2% dw respectively). MAC as a percentage of initial C content was <50% for most soil types, but –50% in Ferralsols, Oxisols and Ultisols. We conclude that while biochar can enhance SOM stocks, attention has to be paid to the soil environment it is amended to. In low-activity clay soils, biochar amendment can lead to C mining and should therefore be co-amended with nutrient-rich organic amendments.
The effect of different species of cyanobacteria on the rice yield and nitrogen use efficiency under different levels of nitrogen fertilizer on Alluvial West Java
Authors: Purwani J , Pratiwi E , Sipahutar I A , Husnain  
Published: February 2021

Abstract
Cyanobacteria or blue-green algae play an important role in rice cultivation. Nitrogen-fixing bacteria Cyanobacteria are found in rice fields, some of which can fix N2 up to 30%, produce some phytohormones, vitamins, amino acids, and organic acids increase soil fertility and rice productivity. The study was conducted in Alluvials wetland rice in Jatitujuh, Majalengka Regency, West Java. This research aimed to analyze the influence of cyanobacteria in increasing rice yield and the efficiency of inorganic N fertilizers. The study was arranged in a randomized block design with two factors. The first factor was the cyanobacteria formula, i.e.: (1) without cyanobacteria, (2) Pseudanabaena sp.+Chlorogloea sp., (3) Pseudanabaena sp.+Nostoc sp., (4) Chlorogloea sp.+Nostoc sp. The second factor was the dose of N fertilizer (0%, 50%, 75% and 100%). The highest rice yield obtained by Chlorogloea sp.+Nostoc sp with 100% N, increased by 14.75%. Application of Pseudanabaena sp. + Nostoc sp. was increased rice grain yield and straw biomass by 11.47% and 37.49%, reduced N fertilizer by 25 to 50%, and increased nutrient uptake of N, P, K by 43.73%, 34.80 %, 34.40%. Using cyanobacteria is a promising strategy to increase rice yield and reduce chemical fertilizers.
Analysis of landscape changes using high-resolution satellite images at former rice fields after earthquake and liquefaction in Central Sulawesi Province
Authors: Nanda G I , Mulyani A 
Published: February 2021

Abstract
An earthquake and liquefaction in Palu and Sigi on September 28, 2018, caused serious damage in the rice fields and agricultural infrastructure. The aim of this research was studying and mapping the impact of the disasters by using high-resolution satellite images and field verification. This research uses a visual analysis method to compare images before and after the disasters. The results showed that 6,467 ha of rice fields affected by the disaster. The heavy damaged rice fields were caused by earthquakes, damaged river embankment, and liquefaction. The landscape with undulating slope having height difference of 1 to 5 m, reversed soil surface, crack width > 100 cm, damage on the irrigation system, and sand boiling, were naturally cannot be used again for rice fields. It can be used as tourism spot or historical sites with natural landscape. Whereas rice fields with undulating slope having height difference 20 to 100 cm, crack width up to 100 cm, and sand boiling were classified as moderate. The lightly damaged rice fields could not be planted because the irrigation system was destroyed. It can be used as rice fields after repairing the irrigation system to support water availability.
Model development of sustainable wetland rice farming based on rice estate community and smart farming
Authors: Rachman L M , Saleh A , Wetik J D , Namuzadi N , Ain A Q 
Published: February 2021

Abstract
Crucial issues in rice fields production in Indonesia are narrow planting areas, small farming scale and improper cultivation techniques. The Indonesian government also faced issues and problems regarding fulfilment the need of rice-farm area due to the conversion of intensive rice fields to non-agriculture. Efforts to develop integrated and sustainable rice field agriculture are needed to overcome the threat of rice field reduction, increase the productivity of rice fields, and increase farmers’ income and welfare. The intention of this study was to develop a model of rice field in an integrated and sustainable manner based on Rice Estate Community and Smart Farming (REC-SF). To get easily implemented model, participatory method was used through series of audiences and focus group discussion activities involving the main stakeholders. As a breakthrough for traditional agricultural solutions on narrow land, this model included land consolidation to reach minimum rice field area for profitable economic scale, strengthening institutional system, productivity target along with required cultivation inputs and techniques, support for information technology system, agroindustry, and marketing-selling reinforcement. Developed REC-SF model is expected to be more easily implemented and accepted by the farmers to achieve a collective farm business in a large rice-farm area.
Research on seismic exploration techniques and methods in urban environment of loess plateau
Authors: Tian A-Wei , Li Zhong-Sheng , Liu Si-Tong , Wang Zhong-Sheng , Zheng Ge-Hui , Yuan Zi-Heng , Huang Hua 
Published: February 2021

Abstract
Seismic wave energy being absorbed strongly in thick loose loess stratum is a major problem that seismic exploration has to face. In the urban environment, this problem is particularly prominent due to the inability to use explosives, borehole explosion, and large-scale 3D observation methods to increase fold number. To solve this difficult problem, a series of seismic exploration effect tests were carried out in Shaoling Plateau, a southern suburb of Xi’an City. A large-tonnage vibroseis, 28-ton vibrator vehicle, was selected as seismic source. By comparing and analyzing the effects of various vibrating parameter of vibrator vehicle, cooperating with different model geophones acquisition, and using appropriate observation system, we had figured out the feasible parameters for the source excitation and data acquisition in the field working area. Based on the results of above test, a nearly 7 km long seismic survey line was completed with pretty good data acquisition, and the expected exploration aims were well achieved.