Accelerating Growth and Yield Components of Bangkok Red Onion Variety Through Plant Spacing and NPK Phonska Fertilizer Dosage

Pamuji Setyo Utomo; Nunuk Helilusiatiningsih

doi:10.59890/ijatss.v4i6.252

Authors

Pamuji Setyo Utomo Universitas Islam Kadiri, Kediri, Indonesia
Nunuk Helilusiatiningsih Universitas Islam Kadiri Kediri, Indonesia

DOI:

https://doi.org/10.59890/ijatss.v4i6.252

Keywords:

Allium Ascalonicum, Macronutrients, Harvest Index, Spatial Engineering, Introduced Varieties

Abstract

Shallots (Allium ascalonicum L.) of the Bangkok variety have high productivity potential, but their genetic expression heavily depends on optimizing vegetative density and the proper supply of macro nutrients. This study aimed to analyze the effect of the interaction between NPK Phonska fertilizer doses and planting spacing on the acceleration of growth and yield components of Bangkok shallots. The field experiment was conducted in Kediri Regency, East Java, using a Randomized Block Design (RBD) with a factorial pattern and three replications. The first factor was the NPK Phonska dose (0, 400, 600, and 800 kg ha-1) and the second factor was planting spacing (20 cm×10 cm, 20 cm×20 cm, and 20 cm×30 cm). The analysis of variance showed that the interaction of the two factors had a very significant effect (p<0.01) on plant height, number of bulbs, dry bulb weight per clump, and dry bulb weight per plot. Applying NPK Phonska at 800 kg ha-1 combined with a wide planting distance of 20 cm × 20 cm produced the best individual performance, with an average of 21.30 tubers and a dry weight of 70.30 grams per clump. On the other hand, the highest absolute yield per area was achieved by the combination of NPK Phonska 800 kg ha-1 with a close planting distance of 20 cm × 10 cm, producing 7.85 kg per plot (equivalent to 19.63 tons ha-1). This study concludes that close spacing combined with high-dose macro nutrient sufficiency can compensate for reduced individual performance through higher population multiplication to achieve maximum land productivity

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