Abstract
The study was conducted west showa zone, Chaliya district Chobi Tulu Chori kebele and Horo Guduru Zone, Horo District Gitilo Dole Kebele during 2018 and 2019 main cropping season to identify optimum agronomic and economic threshold of NPS and Nitrogen inorganic fertilizers. The experiment consisted of two factors (0, 25, 50, 75 and 100 kg ha -1 NPS rates) and (0, 23, 46 and 69 kg ha -1 Nitrogen rates). A total of 20 treatments were laid out in Randomized Complete Block Design with three replications in 5x4 factorial arrangement. The results indicated that primary branch, capsule per plant and yield of linseed were significantly influenced by the effects of NPS and nitrogen fertilizers. The highest grain yields (1400kg and 1382 kg ha -1 ) were obtained from the application of 25 kg ha -1 NPS + 69 N kg ha -1 and 25 kg ha -1 NPS + 46 kg ha -1 N fertilizers respectively. The lowest grain yield (520 kg ha -1 ) was recorded from the control treatment (0 kg ha -1 NPS + 0 kg ha -1 N fertilizers). This indicates that 62.86% yield reduction was recorded as compared to the application of 25 kg NPS ha -1 + 69 kg N ha -1 fertilizer The partial budget analysis indicated that highest net benefit (35389ETB) and acceptable marginal rate of return (2038%) were obtained from the application of 25 kg NPS ha -1 + 46 kg N ha -1 . Therefore application of 25 kg NPS + 46 kg N ha -1 fertilizer rates was recommended for linseed production in the study area and similar agroecology. Keywords: Fertilizer, linseed, marginal rate of return, net benefit. DOI: 10.7176/JNSR/12-9-04 Publication date: May 31 st 2021
Highlights
Linseed, (Linum usitatissimum L.) (n = 15), called flax, is an important oilseed crop which belongs to the family linaceae having 14 genera and over 200 species
The highest capsule per plant at higher N fertilizer could be due to the availability of nitrogen for plants is more when compared to the control treatment (0 kg NPS and 0 kg N)
The highest net benefit obtained from the application of 25 kg NPS ha-1 + 46 kg N ha-1 indicated that the optimum level of fertilizer rate and net benefit increased until this fertilizer rate
Summary
Ethiopia is one the 5th major producer of linseed in the world after Canada, China, USA and India and the first producers in Africa, which is mainly produced in central highland of the nation (Delesa et al, 2010) It has a long history of cultivation by smallholder farmers and the second most important oil crops next to Noug, exclusively for its oil in the traditional agriculture of Ethiopia (Delesa et al, 2010). Even though fertilizer types applied in Ethiopia agriculture system are only urea and di-ammonium phosphate which contain only nitrogen and phosphorous They may not probably satisfy the nutritional requirements of crop plants.
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