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Indian Journal of Agronomy
Year : 2001, Volume : 46, Issue : 4
First page : ( 742) Last page : ( 746)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Influence of nitrogen and potassium application on growth, yield and nutrient uptake by onion (Allium cepa)

Kumar Ashok, Singh Ranbir, Chhillar R.K.

Division of Agronomy, Indian Agricultural Research Institute, New Delhi, 110012

Received:  December,  2000.

Abstract

A field experiment was conducted during spring season of 1996 and 1997 to study the influence of nitrogen and potassium on the onion (Allium cepa L.) cultivar ‘Pusa Madhavi’, at Indian Agricultural Research Insitute, New Delhi. The enhancement in dry weight of tops and bulbs was recorded up to 120 kg N/ha. Similarly, yield attributes like bulb diameter and 100-bulb weight also improved up to 120 kg N/ha. The average increase in bulb yield over the control was 18.3 and 29.6% with the application of 60 and 120 kg N/ha respectively. The onion bulb yield significantly responded to nitrogen application up to 120 kg/ha. There was significant increase in nitrogen uptake up to 120 kg N/ha and in potassium uptake up to 60 kg N/ha. Potassium application significantly increased the dry weight of tops and bulbs, bulb diameter, 100-bulb weight and bulb yield up to 40 kg K2O/ha. The potassium uptake enhanced up to 80 kg K2O/ha application during both the years and nitrogen uptake was affected significantly only in the second year.

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Keywords

Onion, Nitrogen, Potassium, Bulb yield, Nutrient uptake.

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