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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Agronomi Tanaman Tropika (JUATIKA)
Yonny Koentjoro
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Agriculture, Biological Sciences & Forestry

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Pengaruh Radiasi Sinar Gamma Cobalt-60 Terhadap Sifat Morfologi dan Agronomi Ketiga Varietas Jagung (Zea mays L.) . Makhziah; . Sukendah; Yonny Koentjoro
Jurnal Ilmu Pertanian Indonesia Vol. 22 No. 1 (2017): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (278.604 KB) | DOI: 10.18343/jipi.22.1.41

Abstract

Mutation is one of the ways to improve genetic variation in plant breeding so the target traits were more easily obtained. Grains of three varieties of maize (Bisma, Madura local, and Gumarang) were treated with gamma 60cobalt irradiation doses (0, 100, 200, and 300 Gy) before sowing then planted in a split plot randomized block design with three replication, to be evaluated for their morphology and agronomic traits. The Main plot was cultivars and sub plot was gamma radiation rates. There was no interaction between gamma rates and cultivars of maize, but increasing of gamma rates caused decreasing of some traits. Some traits such as plant height and leaves number were decreased significantly when gamma rate increased 100 to 300 Gy as well yield components such as grain weight and grain number per ear. Gamma 200 caused produce more ears than other rates. Bisma exhibited greater performance than Madura and Gumarang both of morphology and agronomic traits.
Optimizing NPK Fertilization with Arbuscular Mycorrhizae Inoculation to Enhance Shallot (Allium cepa L.) Performance under Drought Stress Nabil Hisyam; Saefurrohman; Yonny Koentjoro
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 2 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 2 Mei 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i2.5463

Abstract

Shallots are a high-value horticultural commodity in high demand due to their role in food security. While the demand for shallots increases significantly each year alongside population growth, it has not been matched by stable production increases due to cultivation constraints—one of which is unfavorable environmental factors such as drought. The low tolerance of the plants to water scarcity and their shallow root systems result in inhibited nutrient absorption and reduced yields. Therefore, efforts are needed to increase shallot production, such as through mycorrhizal inoculation and appropriate NPK fertilization. This study aims to determine the optimal combination of mycorrhizal inoculation dosage and NPK fertilizer dosage to influence the growth and yield of the ‘Tajuk’ shallot variety under drought stress conditions.This research was designed as a two-factor factorial experiment arranged in a Randomized Block Design (RBD). The first factor was the mycorrhiza dose, consisting of four treatment levels: 0 g/plant (Control), 5 g/plant, 15 g/plant, and 25 g/plant. The second factor was the NPK dose, consisting of three treatment levels: 300 kg/ha (Control), 270 kg/ha, and 240 kg/ha. The analysis results showed that the treatment with an NPK dose of 300 kg/ha and a mycorrhiza dose of 25 g/plant significantly increased plant height, root length, chlorophyll content, and dry weight.The prominent advantage of these findings lies in proving that mycorrhizal symbiosis acts as a powerful biological buffer, maximizing Nutrient Use Efficiency (NUE) and significantly enhancing the crop's physiological resilience against water deficit. Based on these results, it is highly recommended that farmers cultivating shallots in drylands or drought-prone areas integrate 25 g/plant of mycorrhizal inoculant with the standard 300 kg/ha NPK fertilization.
Co-Authors . Sukendah Nabil Hisyam Saefurrohman