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All Journal Jurnal Pertanian Agros
Abid Raif Rahmatullah
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Agriculture, Biological Sciences & Forestry

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DETERMINAN PENAWARAN CABAI MERAH DI SUMATERA UTARA Rahmanta; Elisabet Siahaan; Lindawati; Abid Raif Rahmatullah; Edi Warsito
Jurnal Pertanian Agros Vol 28 No 1 (2026): EDISI JANUARI
Publisher : Fakultas Pertanian Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v28i1.171

Abstract

The increasing demand for red chili peppers has led to a significant increase in their market circulation. The fluctuating price of red chili peppers encourages farmers to produce larger or smaller quantities of this commodity in the following season. The yield of the harvest will affect the amount of production offered, while supply will affect the price. This study was conducted to analyze the factors that influence the supply of red chili peppers. The method used in this study was quantitative research, and the data used in this study was time series data from 2020 to 2024 on a monthly basis, resulting in 60 observations. The model used was multiple linear double log regression analysis. The results of the study show that partially and simultaneously, the price of red chili peppers, the price of urea fertilizer, the price of ZA fertilizer, the price of TSP fertilizer, the area of harvested land, and labor wages significantly affect the supply of red chili peppers.
PENGARUH TAKARAN UREA TERHADAP HASIL DAN MUTU BENIH BAWANG MERAH Sari Megawati; Rajiman; Ismadi; Abid Raif Rahmatullah
Jurnal Pertanian Agros Vol 28 No 1 (2026): EDISI JANUARI
Publisher : Fakultas Pertanian Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v28i1.176

Abstract

Shallot (Allium ascalonicum L.) is a high-value horticultural commodity with continuously increasing demand. The success of shallot cultivation, particularly for seed production, largely depends on the availability of high-quality seeds, which is influenced by fertilization practices. Nitrogen (N) plays an important role in plant growth and yield formation; however, inappropriate N application can reduce seed quality. This study aimed to evaluate the effects of different urea fertilizer doses on the growth, yield, and seed quality of shallots, as well as to determine the optimal and efficient urea dosage. The research was conducted in Nglipar District, Gunungkidul Regency, Special Region of Yogyakarta, from April to December 2025, using a Randomized Complete Block Design with four urea dose treatments, namely 0, 100, 150, and 200 kg/ha, each replicated six times. Observed parameters included vegetative growth, yield components, and the physical and chemical quality of bulbs. The results showed that increasing urea doses tended to enhance plant height and leaf number up to a certain level, but did not always have a significant effect at the maximum vegetative stage. A urea dose of 100 kg/ha produced the highest bulb weight, productivity, and the best physical and chemical bulb quality compared to higher doses. Application of urea above the optimal rate reduced yield and nitrogen use efficiency. Therefore, a urea dose of 100 kg/ha is recommended as the optimal rate to improve the quantity and quality of shallot seed.  
Co-Authors Edi Warsito Elisabet Siahaan Ismadi LINDAWATI Megawati, Sari Rahmanta Rajiman