Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Optimizing N Fertilizer Use for Sesame Under Rain Fed and Irrigation Conditions

Version 1 : Received: 18 October 2020 / Approved: 19 October 2020 / Online: 19 October 2020 (15:52:14 CEST)

How to cite: Gebregergis, Z.; Sibhatu, F.B.; Teame, G. Optimizing N Fertilizer Use for Sesame Under Rain Fed and Irrigation Conditions. Preprints 2020, 2020100396 (doi: 10.20944/preprints202010.0396.v1). Gebregergis, Z.; Sibhatu, F.B.; Teame, G. Optimizing N Fertilizer Use for Sesame Under Rain Fed and Irrigation Conditions. Preprints 2020, 2020100396 (doi: 10.20944/preprints202010.0396.v1).

Abstract

Inappropriate use of fertilizers is one of the major production constraints in sesame. Studies to optimize the use of N fertilizer on sesame were conducted at Humera Agricultural Research Center (HuARC) under rain fed and irrigation conditions. Thirteen (13) N doses were evaluated in a Randomized Complete Block Design (RCBD) during 2016, 2017 and 2018. In the rain fed condition; results showed higher number of days to 50% flowering on the higher N application. The 31-121.5 kg N ha-1 have scored higher seed yield, where the lower (18 kg N ha-1) and higher (156 kg N ha-1) N doses scored lower seed yield. In the irrigation condition; higher N application rate prolonged the flowering time to some extent and days to 90% maturity was reduced as N rate increased. Heavier seed weights and maximum seed yield were recorded on 64 and 75 kg N ha-1 and the lower N doses scored low seed yield. Agronomic efficiency of N fertilizer (N-AE) was higher on 64 kg N ha-1 under both growing conditions. The partial budget analysis revealed that 64 kg N ha-1 (rain fed) and 75 kg N ha-1 (irrigation) had the higher net profit, MRR and residual ranking. Therefore, for the greater sesame productivity 64 kg N ha-1 has to be recommended for rain fed and 64 to 75 kg N ha-1 for the irrigated sesame.

Subject Areas

Sesame; N fertilizer; agronomic efficiency; seed yield

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