Article Per Year (5 Year)
p-Index From 2020 - 2025
1.945
P-Index
This Author published in this journals
All Journal Agrikultura Journal of Tropical Soils JTSL (Jurnal Tanah dan Sumberdaya Lahan) AGRIVITA, Journal of Agricultural Science Jurnal Solum JURNAL AGROHITA Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks
Yulnafatmawita Yulnafatmawita
Andalas University
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Environmental Science Industrial & Manufacturing Engineering Medicine & Pharmacology Social Sciences Other

Published : 40 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 40 Documents
Search

 1   2   3   4 
PHYSICAL CHARACTERISTICS OF ULTISOLS AND THE IMPACT ON SOIL LOSS DURING SOYBEAN (Glycine max Merr) CULTIVATION IN WET TROPICAL AREA Yulnafatmawita, Yulnafatmawita; Adrinal, Adrinal
AGRIVITA, Journal of Agricultural Science Vol 36, No 1 (2014)
Publisher : Faculty of Agriculture University of Brawijaya and Indonesian Agronomic Assossiation

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Physical characteristicsare among soil propertiesaffecting the susceptibility to erosion.  Determination of physical characteristics of Ultisol was aimed to evaluate the dynamics of soil properties as well asthe impact on soil erosion and runoff (RO) during soybean cultivation in wet tropical area.  Soybean was planted within erosion plots (18 m2)  at 25% slope in UltisolLimauManis (having > 5000 mm annual rainfall).   Soil samples for physical properties (soil texture, bulk density, total pore, permeability, aggregate stability,and organic carbon) as well as amount of RO and soil loss were analyzed at 5 different times (stages) during the cultivation.  The results showed that there was fluctuation in physical properties of Ultisol during the cultivation. Likewise, the amount of runoff and soil loss also changed during the study.  Among the physical properties analyzed, the aggregate stability index of the soil highly correlated to the amount of RO (R2=0.73) and soil loss (R2=0.94).  Amount of RO and soil loss was controlled by soybean development at the average rainfall intensity ≤ 36 mm/day, but not at rainfall intensity >36 mm/day.  It is suggested not to open heavily clayey-low OC soils for seasonal crop farming during rainy season in wet tropical area. Keywords: soil physical properties, Ultisol, erosion,runoff, soybean cultivation
Effects of Slope Position on Soil Physico-chemical Characteristics Under Oil Palm Plantation in Wet Tropical Area, West Sumatra Indonesia Yasin, Syafrimen; Yulnafatmawita, Yulnafatmawita
AGRIVITA, Journal of Agricultural Science Vol 40, No 2 (2018): JUNE
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v40i2.880

Abstract

This research was aimed to study soil physico-chemical properties at four slope positions under oil palm plantation in Dharmasraya, West Sumatra, Indonesia. Soils were sampled at 0-20 cm soil depth from 4 different slope positions (upper, middle, lower slope, and the bottom or flat area). The parameters analyzed were soil texture, SOM, bulk density, total pore, hydraulic conductivity, soil water potential (physical characteristics) as well as soil pH, CEC, Al-exchangeable, basic cations (Ca, Mg, K), N, and P (chemical characteristics). The results showed that the bottom area had better soil physicochemical properties than the others. SOM increased by 33%, total pore by 19%, void ratio by 47%, plant available water (PAW) by 28%, soil pH-H2O by 41%, CEC by 171 %, total-N by 170 %, and P-potential by 114 %, in contrast, soil BD and exchangeable-Al were lower (20 % and 96 %, respectively) in the bottom than in the sloping land. The middle slope had the poorest soil physico-chemical properties after 26 years of forest conversion into oil palm plantation. All sites had clay texture, the clay content increased (R2=0.93) by lowering slope position, and so did SOM content (R2=0.86), soil CEC (R2=0.93), and soil total-N values (R2=0.76).
Characteristics and Stocks of Soil Nutrient under Various Land Use Types in a Super Wet Tropical Rain Forest Padang, West Sumatra Hermansah, Hermansah; Sendi, Nofrita; Yulnafatmawita, Yulnafatmawita; Matsunaga, Tsugiyuki; Wakatsuki, Toshiyuki
JOURNAL OF TROPICAL SOILS Vol 15, No 1: January 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i1.55-62

Abstract

In order to clarify the characteristics and stocks of soil nutrient under various land use types in a super wet tropical rain forest in Padang, West Sumatera. We investigated the nutrient characteristics of the several samples of soils under different land use such as cacao plantation (CP), cinnamon plantation (CMP), mixed garden (MG), and primary forest (PF) in Gadut Mountain, Padang, West Sumatra. The soil nutrient characteristics varied among the different land use types. The range of nutrient characteristics under four land use type were 4.60 – 7.01% and 0.4 – 0.60 % for total carbon and total nitrogen and were 9.80 – 24.59, 0.68 – 2.07 and 0.30 – 0.8 mol (+) kg-1 for Ca, Mg and K, respectively. The highest content of soil nutrient status was found under MG, while the lowest soil nutrient status found at PF. This result indicated that the MG with various vegetation types might contribute in enriching the organic matter in soil. The soil nutrient content such as TN, exchangeable Ca, Mg and K tended to decrease with soil depth of each land use type. However, the sodium (Na) content in soil tended to increase within the soil depth. These were presumably due to evaporation of Na at surface soil within the study area was low. These study results showed that spatially the nutrient properties of soil were closely related to the land use type and management practices. It was suggested that the nutrient characteristics of soils under various land use types in a super wet tropical rain forest region, in Gadut Mountain, Padang West Sumatra were significantly affected by the land use types and land coverage.
Pengukuran Erosi Tanah di Bawah Tanaman Aren (Arenga pinnata Merr) pada Tiga Tingkatan Umur Tanaman di Kecamatan Lintau Buo Utara, Sumatra Barat Via Permata Sari; Yulnafatmawita Yulnafatmawita; Gusmini Gusmini
Agrikultura Vol 32, No 1 (2021): April, 2021
Publisher : Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/agrikultura.v32i1.32555

Abstract

Erosi tanah dapat menyebabkan terjadinya degradasi lahan dan lingkungan. Pengukuran erosi tanah sudah banyak dilakukan dengan tujuan untuk menentukan banyaknya tanah yang terangkut erosi sehingga dapat dilakukan pencegahan untuk meminimalisir terjadinya erosi. Penelitian ini bertujuan untuk mengetahui besarnya erosi pada lahan yang ditumbuhi tanaman aren (Arenga pinnata Merr) dengan tiga tingkatan umur tanaman di Kecamatan Lintau Buo Utara, Sumatra Barat. Penelitian dilakukan dari bulan November sampai Desember 2020 yang dimulai dengan melakukan survei pendahuluan di lapangan yaitu meninjau dan menentukan lokasi serta melakukan penentuan titik-titik pengamatan pada masing-masing penggunaan lahan. Pengukuran erosi tanah dilakukan dengan metode petak kecil pada lahan aren yang berbeda umurnya, serta dari lahan yang memiliki vegetasi rumput sebagai pembanding. Disamping tanah tererosi, beberapa sifat fisika tanah juga diamati, diantaranya tekstur, bahan organik, permeabilitas, bobot isi, dan porositas tanah. Hasil penelitian menunjukkan bahwa erosi pada lahan yang ditumbuhi aren lebih rendah dari lahan semak belukar. Besarnya tanah tererosi pada padang rumput mencapai 0,99 ton/ha, sedangkan pada lahan di bawah tanaman aren yaitu 0,91, 0,62 and 0,95 ton/ha pada tanaman berumur 6, 15, dan 25 tahun, secara berturut-turut. Hal ini didukung oleh sifat fisika tanah yang lebih baik di bawah lahan yang ditumbuhi aren, yang dicirikan oleh kandungan bahan organik yang tinggi (14,10-17,61%), bobot volume tanah yang rendah (0,44-0,63 g/cm3), total ruang pori tanah yang tinggi (76-83%), dan permeabilitas yang agak cepat (8,23-10,12 cm/jam). Tekstur tanah didominasi oleh partikel halus (debu dan liat) dengan kelas tekstur liat pada semak belukar dan liat berdebu pada lahan aren.
PENGARUH PEMBERIAN BEBERAPA JENIS BAHAN ORGANIK TERHADAP PENINGKATAN KANDUNGAN HARA N, P, K ULTISOL KEBUN PERCOBAAN FAPERTA UNAND PADANG Gusmini Gusmini; Yulnafatmawita Yulnafatmawita; Anita Febriani Daulay
Jurnal Solum Vol 5, No 2 (2008): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (102.254 KB) | DOI: 10.25077/js.5.2.57-65.2008

Abstract

A research entitled the effect of various sources of organic matter on improvement of N,P,K Nutrient of Ultisol was conducted in Limau Manis Padang. The research was aimed to investigate the contribution of different source of organic matter to improve N,P,K content in soil. Field research was arranged in Randomized Block Design (RBD)  consisting 5 treatments and 3 replications (blocks). Treatments are : A = no organic matter added, B = Tithonia, C = Paddy Straw, D = Imperata cylindrica, and E = Leucaena glauca. The dosage for each treatment was 20 ton/ha. The result showed that tithonia gave the best contribution in improving N,P,K content of Ultisol Limau Manis.Keywords :organic matter, N, P, K of Ultisols.
Role of Gliricidia sepium in Improving Aggregate Stability of Ultisol Limau Manis Padang: A LABoratory study Yulnafatmawita Yulnafatmawita; Asmar Asmar; Vitria Purnamasari
Jurnal Solum Vol 9, No 1 (2012): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.669 KB) | DOI: 10.25077/js.9.1.44-49.2012

Abstract

There is no much public concern about soil aggregate stability improvement of a soil.  This is due to the fact that it does not directly affect crop yield for a short term, but it determines sustainable agriculture and development for a long term.  This research was aimed to investigate soil physical properties especially soil aggregate stability of Ultisols after fresh OM application, then to determine the exact OM dosage to improve the stability.  Ultisols used was from Limau Manis (± 367 m asl), an area in lower footslope of Mount Gadut, having wet tropical rainforest. Due to land use change, farming activities in that sloping area could enhance erosion process in the environment.  Therefore, efforts to anticipate the erosion must be found.  Fresh OM applied was Gliricidia sepium which was found plenty in the area.  Five levels of fresh Gliricidia sepium, were 0, 5, 10, 15, and 20 t/ha.  Top soil (0-20 cm depth) was mixed with OM, then incubated for 3 months in glasshouse.  The results after a 3-month incubation showed that SOM content did not statistically increase, but it improved based on the criteria, from very low to low level as OM was applied for ≥ 10 t/ha. It seemed that 10 t/ha Gliricidia sepium was the best dosage at this condition. There was a positive correlation between SOM content and aggregate stability index of Ultisols after fresh Gliricidia sepium addition.Keywords: Ultisols, soil aggregate stability, soil organic matter content
HUBUNGAN ANTARA STATUS C-ORGANIK DAN STABILITAS AGGREGAT TANAH KEBUN PERCOBAAN LIMAU MANIS PADANG PADA BEBERAPA PENGGUNAAN LAHAN Yulnafatmawita Yulnafatmawita
Jurnal Solum Vol 3, No 2 (2006): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (82.913 KB) | DOI: 10.25077/js.3.2.75-82.2006

Abstract

Organic matter is one of soil bonding agent in formation and stabilization of soil aggregates or soil structure.  Since it affects several other soil peorperties, soil structure is considered as a determinant for soil quality.  Therefore, depletion of organic matter content in a soil will cause soil degradation and consequently environmental pollution.  This research was aimed to determine org-C status of Ultisols Limau Manis and the relationship to aggregate stability, as affected by land use change.  The results showed that soil organic-C decreased by approximately 42% (from 9.86% to 5.75%) and by 55% (from 9.86% to 4.42%) at 0-10 cm depth and by 45% (from 3.79% to 2.09%) and 18% (from 3.79% to 3.10%) at 10-20 cm depth as land use was changed from forested ecosystem to perennial and annual crops, respectively, in Ultisols Limau Manis Padang.   There was a tendency of positive correlation between soil org-C status and the aggregate stability, or negative correlation between org–C status and the dispersion ratio (DR).  Between both depths, 10-20 cm depth showed a stronger correlation than that of 0-10 cm depth.Key words: org-C, land use change, dispersion ratio, aggregate stability
KAJIAN SIFAT FISIKA TANAH SUB DAS AIR BATANANG DAS SUMPUR KECAMATAN BATIPUH KABUPATEN TANAH DATAR Yulnafatmawita Yulnafatmawita; Amrizal Saidi; Al Asfhihani Elnita
Jurnal Solum Vol 6, No 1 (2009): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.059 KB) | DOI: 10.25077/js.6.1.14-23.2009

Abstract

Excessive utilization of natural resource by human being will affect the sustainability of agriculture, land and environment.  This is due to degradation of soil physical properties in the area.  A research about study of soil physical properties had been taken out in a sub-sub watershed Batanang of Sumpur watershed, Batipuh, Tanah Datar Regency, in West Sumatra.  The research was conducted by surveying the area in 2006.  Disturbed and undisturbed soil samples were taken in different land units.  Then, soil samples were analysed at soil laboratory, Agriculture College, Andalas University Padang.  The result showed that all of land units in this sub sub watersehed had the same soil texture class, that was fine clay.  The bulk volume of the soil was higher in Mixed woodland unit than those in forest land units.  Permeability value of the soil was higher at forest from all degrees of slope than that at mixed woodland, even though soil organic matter content of mixed woodland unit higher than that at forest with 25-45% slope.Keywords: Sub watershed (DAS), forest,  land unit, soil physical properties
ANALISIS SIFAT FISIKA ULTISOL TIGA TAHUN SETELAH PEMBERIAN BAHAN ORGANIK SEGAR DI DAERAH TROPIS BASAH SUMBAR Yulnafatmawita Yulnafatmawita; Rice Agmi Naldo; Azwar Rasyidin
Jurnal Solum Vol 9, No 2 (2012): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (142.261 KB) | DOI: 10.25077/js.9.2.91-97.2012

Abstract

Ultisols as a marginal land need to be reclaimed especially the soil aggregate stability (SAS) under wet tropical area. A research about application of 3 types of fresh organic matter (FOM): Gliricidia sepium dan Tithonia diversifolia) aiming to improve SAS was conducted in Ultisol Limau Manis, wet tropical area, West Sumatra. Fresh organic matter was added to soil at 3 different slope (3, 12, dan 25% slope) in early 2008, then the soil was planted by corn for 4 times until the end of 2009. Corn biomass was return to the land as mulch between crop rows every harversting. The land, then, was fallowed for 1 year (in 2010) before the soil was sampled in 2011 for the physical properties analyses. The results showed that soil organic matter (SOM) content, SAS, permeabilitas, and total pore at 0-20 cm soil depth from plots applied with FOM at all classes of slope were still higher than those control plots. From 3 FOM added, plot added with Tithonia diversifolia still showed better soil physical properties (SOM = 8.3%, SAS = 83). It means that FOM application on Ultisol under wet tropical raiforest still gave effect until 3 years after application.Key Words: Ultisol, stabilitas aggregat, bahan organik segar, bahan organik tanah
EFISIENSI PEMUPUKAN P TANAMAN CABE PADA LAHAN INTENSIFIKASI YANG DIBERI BAHAN ORGANIK DENGAN TEKNIK P-32 Yulnafatmawita Yulnafatmawita; Lusi Maira; Junaidi Junaidi; Yusmini Yusmini; Nurhajati Hakim
Jurnal Solum Vol 3, No 1 (2006): Jurnal SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (64.837 KB) | DOI: 10.25077/js.3.1.19-26.2006

Abstract

Phosphorous (P) is one of plant nutrient needed by plant in much amount as it is called as macro essential plant nutrient. This element, P, has complete problems. It is not only found in a small amount in soil compared to other nutrients, but it also has some problems in soil if it is there. At acid soils such as Ultisols, phosphorous is binded by aluminium (Al) and iron (Fe), while in basic soils it is held by calcium (ca) and magnesium (Mg). Therefore, both in acid soils or basic soils P is not available for plant growth. A research about P-fertilizer use efficiency for chilli (Capsicum annum) on intensification land which was added organic matter (OM) using P-32 technique was conducted in glasshouse and soil laboratory of Agricultural Faculty, and in laboratory of center for research utilizing nuclear science and technique (P3IN) Andalas University Limau Manis Padang from 1996 to 1997. The objective of this research was to measure P-fertilizer use efficiency (FUE) by chili on horticulture intensification area (on Andisols) as affected by organic matter. This research was designed as completely randomized design (CRD) with 2 factors those were TSP (consisting of 0, 25, and 50 kg P2O5/ha) and OM especially chicken manure (consisting of 2, 4, 6, 8, and 10 ton/ha) by 3 replications. The results showed that plant dry matter became higher by decreasing P-fertilizer added but was not significantly affected by manure. P-fertilizer (P-32) uptake by plants was not significantly affected by P-fertilizer and manure aapplication, therefore P-FUE decreased by increasing P-fertilizer added and tended to increase by increasing dosage of manure applied. Key words: fixed-P, available-P, desorpted-P, FUE, P-32 technique
Co-Authors . Adrinal . Burbey . Gusmini Afri Yana Al Asfhihani Elnita Amrizal Saidi Anita Febriani Daulay Anwar, Al Hidayati Maulana Ari Ramayani Arief Fauzan Hakim Armansyah Armansyah Armansyah Armansyah Asmar Asmar Asmar Asmar Asmar Asmar Asmar Asmar Asmar Asmar Asmar Asmar Aulia Rahman Auzar Syarif Azwar Rasyidin Ermadani Ermadani Febrian Anggriani Gusnidar, G Haris, Zainal Abdul Hermansah Hermansah Hermansah Hermansah, Hermansah J Juniarti Junaidi Junaidi Lusi Maira Lusi Maira Matsunaga, Tsugiyuki Mimien Harianti Nurhajati Hakim Rafdea Syafitri Rantau Andhika Refdinal Refdinal Refdinal Refdinal Refdinal, Refdinal Ricci Enrella Rice Agmi Naldo Rosa Nofianti Sendi, Nofrita Sismiyanti Sismiyanti Suci Betrianingrum Sudewi Isminingsih Sudewi Isminingsih Sulaiman Saleh Suyoko Suyoko Syafrimen Yasin Teguh Budi Prasetyo Ulfa, Nadilla Utri Luki Via Permata Sari Via Permata Sari Vitria Purnamasari Wakatsuki, Toshiyuki Yusmini Yusmini Zainal A. Haris Zainal Abdul Haris