Vol. 11, Issue 4 (2022)

Author(s):
Konsam Ibetombi Chanu, Dr. AK Bijaya Devi, Dr. U Chaoba Singh, Dr. N Surbala Devi and Shri N Gopimohan Singh

Abstract:
The present experiment on “Effect of different levels of Nitrogen and Spacing on Growth and Yield of Common Onion (Allium cepa L.) cv. Prema 178 under Manipur Condition” was carried out during the rabi season of 2020-21at the Horticultural Experimental field, Department of Horticulture, College of Agriculture, Central Agricultural University, Imphal from October 2020 to April 2021. The experiment was conducted in Factorial Randomized Block Design (FRBD) constituting four levels of nitrogen (0 kg N/ha or control, 50 kg N/ha, 100 kg N/ha and 150 kg N/ha) and three levels of spacing (10 cm × 10 cm, 15 cm × 10 cm and 20 cm × 10 cm) with 12 treatment combinations replicated thrice. The physio-chemical status of the soil was slightly acidic, clay in texture with medium in available nitrogen, phosphorus, potassium and organic carbon. From the current study, it was observed that application of higher nitrogen dose of 150 kg N/ha (N₄) produced maximum plant height, number of leaves per plant, neck girth, fresh weight of bulb, polar diameter, equatorial diameter and bulb yield. Parameters like plant height and bulb yield were maximum in closer spacing of 10 cm x 10 cm (S₁), while wider spacing of 20 cm x 10 cm (S₃) produced maximum number of leaves per plant, neck girth, fresh weight of bulb, polar and equatorial diameter. In interaction of nitrogen and spacing, treatment combination T₁₀-N₄S₁ (150 kg N/ha and 10 cm × 10 cm spacing) recorded highest plant height and bulb yield; and maximum number of leaves per plant, neck girth, fresh weight of bulb, polar and equatorial diameter were observed at T₁₂-N₄S₃ (150 kg N/ha and 20 cm × 10 cm spacing).In short, it can be concluded that a combination of maximum nitrogen dose of 150 kg N/ha and closer spacing 10 cm × 10 cm produces plants with better growth and higher yield.