Influence of cultivars and NPSBZn fertilizer rates on pseudostem yield and quality of leek (Alium ampeloprasum var. porrum L.) at Lambuda Dstrict, Southern Ethiopia

Abstract

Leek (Allium ampeloprasum var porrum L.) is a member of the Allium genus. It is known for its specific taste and aroma. However, there is lack of area specific fertilizer recommendation and suitable crop cultivars. The experiment was conducted at Lambuda Agricultural Demonstration Site, Wachemo University, Hadiya Zone, Southern Ethiopia, during 2022/2023 belg-cropping season under supplementary irrigated conditions to identify the appropriate level of NPSZ fertilizer rate on yield and quality of leek. The experiment consisted of 2*7 factorial combinations of commercially producing (Casimir) and from black market (Bandit) leek cultivars and NPSBZ fertilizer (0, 25, 50, 75,100, 125, and 150) ha^-1 rates were used in the study. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The intra inter row spacing of 5cm*25cm respectively were used. All data assessed on yield and quality components and analyzed using SAS software version 9.4. Results revealed that the main effect of NPSBZ fertilizer rates and cultivars significantly (P < 0.01) affected the yield parameters (pseudostem length, mean pseudostem weight), and quality parameters (core diameter, shaft diameter, fructan analysis, unmarketable pseudostem yield and total soluble solid). The treatment interaction significantly (P < 0.01) affected marketable pseudostem yield, total pseudostem yield and carotene contents. The highest marketable pseudostem yield (38.53t ha^-1), total pseudostem yield (39.4t ha^-1) and carotene contents (10.29 mg/100ml) were recorded at combination of Casimir with 150 kg NPSBZn rates ha^-1. As per the partial budget analysis the highest net benefit (527,112 ETB ha^-1) was obtained from the combined application of 150 kg NPSBZn rates ha^-1 and Casimir with marginal rate of return (1316.1%).Hence, the combination of 150 kg NPSBZn rates ha^-1 and Casimir profitable than other combinations. Current study presents the increased application of fertilizer rates increased pseudostem yield and quality of leek consistently. Thus, further investigation is required by increasing rates of fertilizer to reach with sound conclusion in Lambuda district and areas sharing similar agro-ecology.