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All Journal Agrifor : Jurnal Ilmu Pertanian dan Kehutanan ZIRAA'AH MAJALAH ILMIAH PERTANIAN
Joko Krisbiyantoro
Sekolah Tinggi Pertanian Kutai Timur
Agriculture, Biological Sciences & Forestry

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Trend Analysis of Rainfall Data in Magelang District Using Mann-Kendall Test and Modification Mann-Kendall Variation Joko Suryanto; Joko Krisbiyantoro
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 17, No 2 (2018): Oktober
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/af.v17i2.3616

Abstract

The objective of the research was to analyzed rainfall trends from 6 rainfall stations Kajoran, Mendut, Muntilan, Ngablak, Salaman and Tempuran rainfall station in different time scales (monthly, 3-months periodicityand annual). Identification homogenity of the rainfall data period 1986-2016 for Magelang district using Rescaled Adjusted Partial Sums (RAPS) methode. The three non-parametric tests, Mann-Kendall (MK), modified Mann-Kendall (MMK), trend free prewhitening Mann-Kendall (TFPW-MK) and Sen’s slope wereemployed to assess significance of trends and detecting magnitude of trends.The results shows that monthly rainfall have no significant trend using MK, MMK, and TFPW-MK test at 0.05 level significance. Rainfall 3-month based January-February-March (JFM) period Kajoran station have negative significant trend with magnitude 19.4 mm/3-month. Mendut station have positive trend for April-May-June (AMJ) period with magnitude 6.75 mm/3-month. No significant trends at 0.05 level significance using MK trend test were detected in annual rainfall for 6 rainfall stations.
PERAN UNSUR HARA MAKRO TERHADAP PERTUMBUHAN DAN HASIL BAWANG MERAH (Allium cepa L.) Dian Triadiawarman; Dhani Aryanto; Joko Krisbiyantoro
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 21, No 1 (2022): Maret 2022
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/agrifor.v21i1.5795

Abstract

Peran unsur hara makro terhadap pertumbuhan dan hasil bawang merah (Allium cepa L.). penelitian ini dilakukan pada bulan Juli – September 2020 di Kebun Percobaan Program Studi Agroteknologi STIPER Kutai Timur. Penelitian menggunakan metode survei dengan mengambil sampel tanah pada masing-masing titik sampling untuk dilakukan analisis unsur hara makro tanah di laboratorium. Analisis data menggunakan regresi linier berganda ditujukan untuk mengidentifikasi unsur hara makro tanah yang paling erat hubungannya dengan pertumbuhan dan hasil tanaman bawang merah, serta mencari bentuk hubungan antara peubah unsur hara makro tanah tersebut dengan peubah pertumbuhan dan hasil tanaman bawang merah (jumlah daun, jumlah anakan, jumlah umbi dan berat umbi). Hasi penelitian menunjukan bahwa unsur hara pada lokasi penelitian memiliki kandungan N-total sangat rendah-tinggi, P-tersedia tinggi-sangat tinggi dan K-tersedia sangat rendah. Unsur hara N memberikan hubungan yang negatif terhadap semua parameter, kandungan unsur N yang rendah tidak dapat meningkatkan pertumbuhan vegetatif.  unsur P memberikan hubungan positif hanya pada jumlah anakan, kandungan P dalam tanah mempercepat pertumbuhan akar dan jumlah anakan. Unsur K memberikan hubungan positif terhadap semua parameter. Unsur K dalam tanah yang cukup membantu dalam metabolisme pertumbuhan tanaman.
UJI KINERJA DAN ANALISIS EKONOMI RICE MILLING UNIT SINGEL PHASE DI DESA LONG LESS Joko Krisbiyantoro; Dhani Aryanto
ZIRAA'AH MAJALAH ILMIAH PERTANIAN Vol 47, No 3 (2022)
Publisher : Pusat Publikasi Jurnal Universitas Islam Kalimantan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/zmip.v47i3.7773

Abstract

The rice milling business that was most widely used by the community in the Busang sub-district was the Rice Milling Unit single phase. This study aims to test the performance and economic analysis of a single-phase rice milling business. The research method was descriptive using secondary data from the rice milling business and primary data obtained from interviews. The data parameters in this study were: work capacity, yield, efficiency, grain quality, stripping quality, and economic analysis. The rice varieties used in the performance test were kawan and sumping rice varieties. The results of the performance test of the single-phase rice mill is that the average working capacity of the kawan rice variety was 260.9 kg/hour with a yield of 65% and the sumping rice variety was 254.2 kg/hour with a yield of 59%. The stripping efficiency value of the kawan rice variety was 39.27% while the sumping rice variety was 34.78%. Milled rice was not yet the criteria for medium rice (SNI 01-0224-1987), this was due to the milling process that is carried out repeatedly so that it produces rice groats were high. The economic analysis of the rice milling business in Long Lees Village has an NPV value of Rp. 42,536,000, a B/C ratio value of 1.67, and an IRR value of 37% which indicates that the rice milling business was feasible.
Co-Authors Dhani Aryanto Dian Triadiawarman Joko Suryanto