Agronomy

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    GROWTH, NODULATION, AND YIELD OF MUNGBEAN (Vigna radiata L. (Wilczek) AS AFFECTED BY THE COMBINED USE OF BIOCHEMICAL FERTILIZERS AT HAWASSA, SOUTHERN ETHIOPIA
    (Hawassa University College of Agriculture, 2021) TAMIRAT TADEWOS GIYA
    Mungbean (Vigna radiata L. (Wilczek) is a short duration, legume crop cultivated for consumption, industrial processing, with a potential for alleviation of climate change effects on crop production due to its biological nitrogen fixing ability. Integrated use of bio-chemical fertilizers is beneficial in achieving sustainable crop yield improvement and sole dependency on chemical fertilizer is not recommendable due to its unaffordable cost and contribution to climate change. Hence, this experiment was conducted under field condition in the 2019/20 main cropping season at Hawassa University experimental site to determine the combined effects of bio-chemical fertilizer sources on the growth, nodulation, and yield of mungbean. The factorial combinations of four bio-slurry levels (control, 50, 100, and 150%) and four inoculant/N fertilizer treatments (control, 23kg N ha-1 , strain MB-001, and 23kg N + strain MB-001) were laid out in a randomized complete block design with four replications. Data on growth, nodulation, gas-exchange, and yield parameters were collected following the standard procedures. The results revealed that the interaction effects of bio-slurry and inoculant/N fertilizer had a marked effect on phenology, nodulation, and yield parameters. Combined application of bio-slurry and inoculant/N fertilizer delayed days to flowering and days to physiological maturity. Rhizobium inoculation alone and applying with 100% bio-slurry resulted in significant improvement in nodule number, nodule dry weight, and nodule diameter of mungbean. Similarly combined application of bio-slurry and inoculant/N fertilizer had shown a significant impact on a hundred seed weight, above ground biological, grain, and straw yields. For instance, the application of 150% bio-slurry with 23 kg N ha-1 resulted in the highest biological and straw yield whereas the application of 100% bio-slurry with inoculant resulted in marked improvement of seeds pod-1 and grain yield. Pod number plant-1 and hundred seed weight were highest when 100% bio-slurry was applied. The highest net benefit with the highest marginal rate of return was obtained from the combined application of 50% bio-slurry with 23kg ha-1 N fertilizer followed by 100% bio-slurry with Rhizobium inoculation. From this result, it can be concluded that the application of 50% bio-slurry ha-1 in combination with 23kg ha-1 N fertilizer can be recommended for mungbean production in the experimental area and areas having similar agroecology and socio-economic status.
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    RESPONSE OF MUNGBEAN (Vigna radiata (L.) Wilczek) VARIETIES TO DIFFIRENT RATES OF NPSB FERTILIZER RATESAT ZALA DISTRICT, SOUTHERN ETHIOPIA
    (Hawassa University College of Agriculture, 2021) HABTAMU HARINGO
    Mungbean (Vigna radiata L.) is the sixth exportable pulse crop in Ethiopia and is a useful protein source for consumers in semi-arid and arid areas of the country. However, its current national productivity is 1.003ton ha-1 , which is much lower than its potential due to the unavailability of balanced nutrients in the soil. Therefore, thisstudy was carried out to evaluate the response of Mungbean varieties toNPSB fertilizer rates. The experiment was conductedin Zala woreda, during the main cropping season of 2021.The experiment was laid out using RCBD in a factorial arrangement with three replications. There was a total of sixteen treatments from a factorial combination of four fertilizer rates (0, 50,100 &150 kgha1 ) and four varieties of Mungbean (Borda,Rasa (N26),NVL-1 & Gofa local).The results revealed that fertilizer had a significant (P<0.05) effect on days to flowering, days to physiological maturity, plant height, brunch number, nodule number, pod number per plant, seed number per pod, thousand seed weight, grain yield, above ground dry biomass, and strow yield. Varieties also had a significant (P<0.05) effect on days to physiological maturity, branch number, pod number per plant, seed number per pod, thousand seed weight, grain yield and harvest index.The interaction of NPSB fertilizer application with verities also had a significant(P<0.05) effect on days to flowering, days to physiological maturity, number of seeds per pod, thousand seed weight, grain yield, dry above ground biomass and harvest index.The highest yield (2.5tonha-1 ) resulted from the interaction effect of the150kg NPSB with the Boreda Varity application. The partial budget analysis also indicated that the best treatments were interaction of the 150kgha-1NPSB with Borda and Rasa (N-26), which gave the first and second highest net benefits of 126126 and 96600 ETB ha-1 , respectively, with an acceptable marginal rate of returns. Therefore, mung bean producers can use the NPSB mixed fertilizer at the rate of 150kg ha-1 and Boreda Variety in the Zala district of the Gofa Zone and other similar areas to increase their productivity.