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All Journal Journal of the Indonesian Tropical Animal Agriculture JURNAL PERTANIAN PRESISI (JOURNAL OF PRECISION AGRICULTURE) Jurnal Agroplasma
D.W. Widjajanto
Faculty of Animal Agriculture, Diponegoro University, Semarang, Central Java
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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PHOSPHATE ROCK APPLICATION ON ALFALFA (Medicago sativa L.) PRODUCTION AND MACRONUTRIENTS IN LATOSOL SOIL Liani, Y.; Hong-Qing, Hu; Sumarsono, S.; Widjajanto, D.W.; Guanjie, Jiang
Journal of the Indonesian Tropical Animal Agriculture Vol 36, No 4 (2011): (December)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.36.4.290-296

Abstract

The objective of this study was to evaluate the effectiveness of phosphate rocks (PRs) fertilizercompared to chemical P fertilizer for the best crop production and macronutrients of alfalfa. Acompletely randomized design under 3x3 factorial patterns was used in this research. The first factorwas different sources of P fertilizer: Guizhou Phosphate Rock (GPR), Jingxiang Phosphate Rock (JPR),and Single Super Phosphate (SSP). The second factor was level of P fertilizer: 75, 100, and 125 mgP2O5/kg soil. A control treatment (without addition of P fertilizer, CK) was added as a comparison withthe treatments. The results showed that JPR was the best for alfalfa production, whereas GPR and SSPwere better for nutrient content in the alfalfa tissue than JPR. On the whole, phosphate rocks had similareffect on alfalfa growth compared to SSP at the experimental conditions.
Produksi Tanaman Ubi Jalar Ungu dan Rumput Gajah Odot pada Sistem Tanam Tumpangsari dengan Jarak Tanam Berbeda Asmoro, Zherlin; Widjajanto, D.W.; Sumarsono, Sumarsono
JURNAL AGROPLASMA Vol 9, No 1 (2022): AGROPLASMA VOL 9 NO 1
Publisher : UNIVERSITAS LABUHANBATU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/agroplasma.v9i1.2732

Abstract

The aim of the study was to examine the treatment of purple sweet potato spacing and elephant grass cv. Odot (Pennisetum purpureum cv. Mott) spacing on the production of purple sweet potato and elephant grass cv. Odot. Field experiment was conducted in Kalongan Village, East Ungaran Sub-district, Semarang District (7o08’27”-7o15’72”Sand 110o40’88”-110o.48’14” E). Analysis of soil, fertilizer and dry matter of purple sweet potato and elephant grass cv. Odot were carried out at the Ecology and Plant Production Laboratory, Department of Agriculture, Faculty of Animal and Agricultural Sciences, Diponegoro University, Semarang from March to August 2021. A 2 x 4 factorial experiment based a randomized block design with 3 replications was used throughout the experiment. The first factor was the spacing of purple sweet potatoes consisted of V1: 90 cm x 30 cm, V2: 90 cm x 40 cm, V3: 90 cm x 50 cm and V4: 90 cm x 60 cm. The second factor was the spacing of elephant grass cv. Odot, namely T1: 90 x 60 cm and T2: 90 x 45 cm. The data obtained were statistically analyzed using analysis of variance (ANOVA) and significantly different parameters were tested by Duncan's Multiple Distance Test at 5% level. The results showed that the spacing of purple sweet potato and spacing of elephant grass cv. Odot had no significant effect on the production of purple sweet potato but had a significant effect on the production of elephant grass cv. Odot. Based on the results of the competition index, it was concluded that the purple sweet potato plant was more dominant than the elephant grass cv. Odot. Keywords : dry matter production, intercropping, Pennisetum purpureum cv. Mott, sweet potato
PENGARUH JARAK TANAM DAN PENERAPAN FOSFOR BERBASIS PUPUK ORGANIK CAIR LIMBAH TAHU TERHADAP PERTUMBUHAN DAN PRODUKSI KEDELAI (Glycine max (L.) Merr.) Nurfatdiah, Ajeng; Widjajanto, D.W.; Fuskhah, Eny
Jurnal Pertanian Presisi (Journal of Precision Agriculture) Vol. 9 No. 2 (2025)
Publisher : Universitas Gunadarma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35760/jpp.2025.v9i2.33

Abstract

Tujuan penelitian adalah untuk mengkaji pengaruh jarak tanam dan dosis fosfor (P) berbasis pupuk organik cair (POC) limbah tahu terhadap pertumbuhan dan produksi tanaman kedelai. Percobaan dilakukan dengan Rancangan Acak Kelompok dengan 2 faktor perlakuan dan 3 ulangan. Faktor pertama adalah jarak tanam, terdiri 2 taraf yaitu J1 = 40 cm x 15 cm dan J2 = 40 cm x 20 cm. Faktor kedua adalah dosis P berbasis POC limbah tahu terdiri 4 taraf yaitu A0 = 0 kg ha-1 P2O5 setara 0 L ha-1 POC, A1 = 15 kg ha-1 P2O5 setara 13,392 L ha-1 POC, A2 = 30 kg ha-1 P2O5 setara 26,785 L ha-1 POC dan A3 = 45 P2O5 kg ha-1 setara 40,178 L ha-1 POC. Data dianalisis statistik menggunakan analisis ragam, kemudian diuji lanjut menggunakan uji jarak berganda Duncan pada taraf 5%. Hasil penelitian menunjukkan bahwa perlakuan jarak tanam berpengaruh nyata terhadap parameter jumlah bintil akar efektif dan bobot 100 biji. Perlakuan dosis fosfor berbasis POC limbah tahu berpengaruh nyata terhadap parameter bobot 100 biji. Interaksi antara perlakuan jarak tanam dan dosis fosfor berbasis POC limbah tahu berpengaruh nyata pada bobot 100 biji.
Co-Authors Asmoro, Zherlin Eny Fuskhah Hu Hong-Qing Jiang Guanjie Nurfatdiah, Ajeng Sumarsono Sumarsono Y. Liani