Impact of drip fertigation on nutrient use efficiency, dynamics, water productivity and bulb yield in Aggregatum onion

S K Natarajan; T Sampathkumar; J Bhuvaneswari; M Manikandan; S Thenmozhi

doi:10.14719/pst.5937

Authors

S K Natarajan Department of Agronomy, Tapioca and Castor Research Station, Yethapur 636 119, Salem, Tamil Nadu, India https://orcid.org/0009-0003-6482-3276
T Sampathkumar Department of Agronomy, Agricultural College and Research Institute, Madurai 625 104, Tamil Nadu, India https://orcid.org/0000-0002-5400-4651
J Bhuvaneswari Department of Agronomy, VOC Agricultural College and Research Institute, Killikulam 628 252, Vallanad, Tamil Nadu, India https://orcid.org/0000-0002-0415-9575
M Manikandan Department of Soil and Water Conservation, Agricultural Research Station, Kovilpatti 628 501, Tuticorin, Tamil Nadu, India https://orcid.org/0000-0002-0416-8359
S Thenmozhi Department of Soil Science and Agricultural Chemistry, ICAR-KVK, Woodhouse farm, Dodabetta, Ooty 643 002, The Nilgiris Tamil Nadu, India https://orcid.org/0000-0002-9774-7017

DOI:

https://doi.org/10.14719/pst.5937

Keywords:

aggregatum onion, drip fertigation, nutrient dynamics, nutrient use efficiency, water use efficiency

Abstract

A field experiment was conducted on aggregatum onion (Allium cepa L. var. aggregatum Don.) under a drip irrigation system to evaluate the water productivity, nutrient use efficiency, nutrient dynamics and yield of onion in order to optimize the best fertigation level. The experiment was designed in a Randomized Block Design (RBD), with treatments replicated 3 times. The treatment details are as follows: T1-100% nitrogen (N) through fertigation with 100% phosphorus (P) and potassium (K) applied as basal; T2 - 100% N and K through venturi as fertigation and basal application of 100% P; T3 - 100% N, P and K through fertigation; T4 - 75% N, P and K through fertigation with basal application of 25% N, P and K; T5 - 75% N through fertigation with 75% P and K applied as basal; T6 - 75% N and K through venturi as fertigation with basal application of 75% P; T7 - 75% N, P and K through fertigation; T8 - 75% of N, P and K through fertigation and 25% of 75 % N, P and K applied as basal; T9 - 50 % N 100 % P and K applied as basal and 50% N applied on 30 DAT; T10 - absolute control (no fertilizer). The results indicated that the bulb yield of aggregatum onion was significantly higher in 100% N, P and K through fertigation (23.24 to 23.47 t ha-1). Among the different fertigation treatments, the 100% N, P and K through fertigation recorded higher water use efficiency (75.08 to 78.44 kg/hamm), water productivity (7.841 to 7.508 kg m-3) and nutrient use efficiency, which was comparable to the 75% N, P and K through fertigation.

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