Abstract
The study was conducted at Chaliya district Chobi Tulu Chori kebele and Horo District Gitilo Dole Kebele during 2018 and 2019 main cropping season to identify optimum agronomic and economic threshold of NPS and Nitrogen fertilizers. The experiment consisted of two factors (0, 25, 50, 75 and 100 kg ha<sup>-1</sup> NPS rates) and (0, 23, 46 and 69 kg ha<sup>-1</sup> 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, above ground dry biomass and yield were significantly affected by the main effect of NPS and nitrogen fertilizers. The highest grain yield (1400kg and 1382 kg ha<sup>-1</sup>) were obtained from the application of 25 kg NPS + 69 N kg ha<sup>-1</sup> and 25 kg NPS + 46 kg ha<sup>-1</sup> N fertilizers respectively. The lowest grain yield (520 kg ha<sup>-1</sup>) was recorded from the control treatment (0 kg NPS + 0 kg ha<sup>-1</sup> N fertilizers). This indicates that 62.86% yield reduction was recorded as compared to the application of 25 kg NPS ha<sup>-1</sup> + 69 kg N ha<sup>-1</sup> fertilizer. The highest net benefit (35389ETB) and acceptable marginal rate of return (2038%) were obtained from the application of 25 kg NPS ha<sup>-1</sup> + 46 kg N ha<sup>-1</sup>. Therefore application of 25 kg NPS + 46 kg N ha<sup>-1</sup> fertilizer rates was recommended for production of linseed in the study areas and similar agroecology.
Highlights
Linseed, (Linum usitatissimum L.) (n=15), is an important oilseed crop which belongs to the family linaceae having 14 genera and over 200 species
Phosphorus fertilizer is critical for plant growth and yield of linseed. [6] reported that mean performances of linseed differed for seed and straw yields with the application of phosphorus fertilizer [4] stated that linseed response to phosphorus fertilizer addition is highly variable, supporting the importance of maintaining medium to high soil P levels to optimize linseed yields. [7] reported that Phosphorus did not significantly increase the yield. [8] concluded that to optimize crop nutrition, phosphorus must be available to the crop in adequate amounts during the growing season
Even though the production area of linseed is the second largest next to Noug, its productivity is still low as compared to its potential productivity
Summary
Linseed, (Linum usitatissimum L.) (n=15), is an important oilseed crop which belongs to the family linaceae having 14 genera and over 200 species. It is one of the oldest crops known to man and it has been cultivated for fiber and seed oil. The reaction of linseed to nitrogen has been well established, as has the sensitivity of crop emergence and seed yield to seed-placed nitrogen [4, 5] reported that nitrogen levels affect plant height, number of capsules/plant, 1000-seed weight and seed yield ha-1. [7] reported that Phosphorus did not significantly increase the yield. Phosphorus fertilizer is critical for plant growth and yield of linseed. [6] reported that mean performances of linseed differed for seed and straw yields with the application of phosphorus fertilizer [4] stated that linseed response to phosphorus fertilizer addition is highly variable, supporting the importance of maintaining medium to high soil P levels to optimize linseed yields. [7] reported that Phosphorus did not significantly increase the yield. [8] concluded that to optimize crop nutrition, phosphorus must be available to the crop in adequate amounts during the growing season
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