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This Author published in this journals
All Journal Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Journal of Tropical Soils Berkala Ilmiah Pertanian AGRIVITA, Journal of Agricultural Science Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Pengabdian Magister Pendidikan IPA Jurnal Teknologi Pertanian Andalas INTEGRITAS : Jurnal Pengabdian Pancaran Pendidikan
Yagus Wijayanto
Program Studi Agroteknologi, Fakultas Pertanian, Universitas Jember, Jl. Kalimantan No.37 , Kabupaten Jember
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Physics Social Sciences Other

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Journal : Journal of Tropical Soils

 1 
Site Specific Nitrogen Management Simulated by CropSyst Model under Different Inputs of Nitrogen Fertilizer Yagus Wijayanto
JOURNAL OF TROPICAL SOILS Vol 15, No 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.229-235

Abstract

Site Specific Nitrogen Management Simulated by CropSyst Model under Different Inputs of Nitrogen Fertilizer (Y Wijayanto): Site Specific Nutrient Management (SSNM) has been suggested as the only means for increasing productivity of crops and minimizing the environmental impacts. Despite of this, it is also widely recognized that compared to uniform application, SSNM provides a significant challenges related to the level of management. This is due to the fact that SSNM relates to the management of field / site (or fields / sites) and considers also the spatial and temporal component of factors leading to crop production. A method is urgently required and the most appropriate one is crop model. This study was aimed at using  CropSyst to model yields due to the difference in N applications  and its implementation for SSNM. The study area was located at Jenggawah Village, Sub-District Jenggawah, Jember Regency. Thirty soil samples were taken and six farmer’s fields were chosen for the purpose of modeling. Interview was conducted to obtain the information about the management of farmer’s fields. Yields in each farmer’s fields were used as an integrated indicator. The results suggested that the predicted yields at farmer’s fields were in agreement with those in reality. Simulated yields  based on  different amount of N inputs showed yields were proportional with different N inputs. This study concluded that there do exist a significant amount of potential applications of CropSyst for Site Specific Nitrogen Management
Using Geostatistics for Spatial Analysis of Soil Moisture Content, Electrical Conductivity, and pH at Paddy Fields Yagus Wijayanto; Muhammad Aldian Dwi Kustianto; Subhan Arif Budiman; Ika Purnamasari
JOURNAL OF TROPICAL SOILS Vol 28, No 2: May 2023
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2023.v28i2.47-56

Abstract

Soil is dynamic due to various internal and external processes exerted on the soil, resulting in unique soil characteristics in space in short and long distances. Geostatistics (kriging) is the method of quantifying the spatial variation of soil properties. This research was mainly aimed at applying geostatistics to quantify and interpolate the spatial dependence and structure of three soil properties, namely pH, EC, and Soil Moisture Content (SMC) in a small area. This research was conducted on paddy fields in Mlandingan Kulon Village, Situbondo Regency. Sampling was conducted on an area of   9.2 ha with 31 sample points. Normal data distribution was found for pH and EC, whereas this was not the case for SMC. The results of the analysis showed that most of the pH values   were alkaline (>8), EC values were non-saline (<2 mm/cm), and SMC was in the low category (<20%). The results show that for three soil properties, weak dependencies were observed. The values of Root Mean Square Error (RMSE)  confirmed that kriging with exponential was better compared to the spherical model, resulting in the RMSE of 0.546 (pH), 0.041 (EC), and 1.512 (SMC).
Co-Authors Agung Sih Kurnianto Ahmad Ilham Tanzil Arthur Frans Cesar Regar Arthur Frans Cesar Regar Ati Kusmiati Bambang Hermiyanto Bambang Kusmanadhi Bejo Apriyanto Distiana Wulanjari Edy Prastyanto Elan Artono Nurdin Fahmi Arif Kurnianto Fahrudi Ahwan Ikhsan Ika Purnamasari Ika Purnamasari Indah Ibanah Lenny Widjayanthi Moch. Reza Wahyu Abdilah Muhammad Aldian Dwi Kustianto Nabila Nur Aisyah Al Ayyubi Ristiyana, Suci Roni Bahtiar Sigit PRASTOWO Subhan Arif Budiman Subhan Arif Budiman Tri Agus Siswoyo Tri Ratnasari Tri Wahyu Saputra Ummi Sholikah Ummi Sholikhah Wildan Muhlison, Wildan Yoni Cahyono