The field experiment was carried out at Haro Sabu Agriculture Research Center, during 2013 with the objectives of determining the effect of varieties and population densities of soybean intercropped with maize on yield and yield components of associated cr productivity of the system. The experiment was laid out in RCBD with three replication in factorial combination of three soybean varieties (Boshe, Ethio and three soybean plant populations (25%, 50% and 75%) along with respec crop of soybean varieties and maize BHQPY soybean varieties significantly (P<0.05) affected number of ears per plant, thousand kernel weight and HI of maize. The higher number of ears per plant (2.30), thousand kernels weight (243.88 g) and HI (38.11%) were obtained from 25% soybean population. The highest number of ears per plant (2.31) was obtained from intercropping of maize with soybean variety Boshe. Maize grain yield was significantly ( interaction of main effects. The highest maize grain yield (7.33 t ha the combination of 50% soybean population of variety Boshe. Sole cropped maize gave significantly higher number of kernels per ear, biological yield, grain yield and HI than the respective intercrop. Biological yield and grain yield of soybean were significantly (P<0.01) affected by soybean varieties. Biological yield (5.53t ha ha -1

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 -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, 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 -1 ) were obtained from the application of 25 kg NPS + 69 N kg ha -1 and 25 kg NPS + 46 kg ha -1 N fertilizers respectively. The lowest grain yield (520 kg ha -1 ) was recorded from the control treatment (0 kg 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 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 production of linseed in the study areas and similar agroecology.