Evaluation of Nano urea on growth and yield parameters of cowpea (Vigna unguiculata) in Chitwan, Nepal
DOI:
https://doi.org/10.26832/24566632.2025.1004018Keywords:
Granular urea, Nano urea, Nitrogen use efficiency, Yield characteristicsAbstract
Granular urea has low nitrogen use efficiency and poses environmental risks. As a response, Nano urea is emerging as an innovative substitute. A field experiment conducted at Chitwan, Nepal to explored the effect of Nano urea on growth and yield parameters of cowpea, and its potential to substitute granular urea. The experiment was laid out in Randomized Block Design, with eight treatments and three replications: control, 100% recommended dose of nitrogen (RDN) through granular urea, single and double spray of Nano urea at 0.2% and 0.4%, and combination of 50% of RDN with 0.2% and 0.4% Nano urea. Various growth and yield parameters such as plant height, canopy diameter, leaf area index, number of primary branches, pod yield, pod length, pod diameter, pod per plant were recorded, which were found significantly affected by the treatments. Results revealed that 50% RDN granular urea + NU (0.2%) recorded the highest canopy diameter (97.43 cm), primary branches (5.92) leaf area index (0.38), pod yield (12.59), and pods per plant (30.6), with single spray of 0.2% of Nano urea at flowering stage being the most effective. Therefore, the study demonstrated that Nano urea has potential to substitute 50% of conventional granular urea, contributing to sustainable cowpea production.
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