College of Dryland Agriculture and Natural Resources Management

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    Effect of Blended (NPSB) Fertilizer Rates on Growth Performance, Yield and Yield Components of Tomato (Lycopersicon esculentum M.) Varieties in Enderta District, Northern Ethiopia.
    (Mekelle University, 2025-06-13) Birhane Kebede Weldegebriel
    The effects of blended fertilizer rates (NPSB) on growth, production, and yield components of tomato varieties (lycopersicon esculentum M.) were studied using irrigation facilities at Elshadai Relief and Developmental Association (ERDA agricultural farm, Mekelle). 4x3 factorial experiment was set up in a randomized complete block design (RCBD. The treatments included four rates of blended (NPSB) fertilizer (0 kg ha-1, 50 kg ha-1, 100 kg ha-1, and 150 kg ha-1) and three tomato varieties (Melka shola, Roma VF, and Gelelma). Data were collected on tomato growth, yield, and yield components. Results indicated that the impacts of blended fertilizers (NPSB) on tomato varieties were significant with p-value of 0.05 in terms of plant height, leaf number per plant, marketable fruit number per plant, and number of total fruit yield per plant, and total fruit yield per hectare. The blended fertilizer rates (NPSB) and tomato varieties had important interaction effects on the Number of fruit cluster per plant, number of leaves per plant and total fruit yield per hectare. Results indicated a positive association between tomato varieties growth, yield, and yield components. Among the different rates of blended fertilizer rates, significantly shorter days to 50% flowering dates (47 days) and maturity date (105), taller plant height (92cm), higher leaf number per plant (93.79), the highest number of total fruit number per plant (43.61), higher marketable fruit number per plant (40.51), and total fruit yield (28.23 t ha-1) were gained from the application of 150 kg ha-1 and 100 kg ha-1. Among the varieties, Gelelma produced the highest overall fruit number per plant (40.62) and marketable fruit yield (24.50 t ha- 1) over Melka shola and Roma VF. In the study area, Gelelma tomato variety treated with 150 kg ha-1 of blended (NPSB) fertilizer produced the highest total yields (32.20 t ha-1) under 150 kg ha- 1 of blended (NPSB) fertilizer. Therefore, it is recommended to conduct further research in tomato varieties in many locations and seasons with different (NPSB) blended fertilizer rates.
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    Effect of intra-row spacing and NPS fertilizer rates on growth and bulb yield of onion (Allium cepa L.) in Saharti District, South Eastern zone of Tigray, Ethiopia
    (Mekelle University, 2025-02-17) Kidane Tesfay
    Onion (Allium cepa L.) is one of the most important vegetable crops cultivated under irrigated conditions in the southeastern zone and some parts of the other region; the Tigray. The cultivation of onions requires proper supply of plant nutrients and plant densities. Despite of several constraints linked with onion production and productivity Inappropriate application rates of NPS fertilizer and inappropriate plant densities are one of the major constraints for onion production and growth in the study area. Therefore, this study was initiated with the aim of to determine Effect of intra row spacing and NPS fertilizer rates on growth and bulb yield of onion in Saharti District, South Eastern zone of Tigray, Ethiopia. The experiment was arranged in factorial combination of four level of intra row spacing (5, 7.5,10 and 12.5 cm) and four NPS fertilizer rates (0,150,200 and 250 kg ha -1) in a Randomized Complete Block Design with three replications. Growth and bulb yield components of onion data were collected and analyzed using GenStat software 18th edition. The analysis of variance showed that intra row spacing and NPS fertilizer had significant effect on days to physiological maturity, leaf length, leaf number per plant, bulb length and bulb diameter. The interaction effect of intra-row spacing and NPS fertilizer had significant effect on plant height, average bulb weight gram per plant, marketable bulb yield, unmarketable bulb yield, and total bulb yield. The highest marketable bulb yield 38.5 t ha-1 was obtained on the combined application of 200 kg ha -1 NPS fertilizer rate with 5 cm intra-row spacing. The highest net benefit (ETBirr 1,843,300) with the highest of Marginal rate of return (2942 %) was obtained on the combined application of 200 kg ha-1 NPS fertilizer rate with 5 cm intra-row spacing. Accordingly, onion producers in Saharti District and similar agro-ecologies can adopt the combination of 5 cm intra-row spacing and 200 kg ha-1 NPS fertilizer to achieve high marketable bulb yields, maximize net benefits, and obtain high marginal rates of return. However, as this study was conducted in a single location and season using the Bombay Red onion variety, further research is necessary to validate these findings across various seasons, locations, and with different improved onion varieties.