Abstract
This research was conducted to study the interaction effect of different rate of nitrogen fertilizer and plant spacing on yield and yield components of shallot under Jimma condition, in the experimental field of College of Agriculture and Veterinary Medicine, Jimma University. Local variety of shallot was used with the three level of nitrogen (0kg/ha, 100kg/ha, 150kg/ha) and three intra-row spacing (10cm, 15cm, 20cm). The result of this field experiment indicated that, the interaction effect of 150gk/ha and 20cm spacing resulted highly significant plant height (30.33cm) (p<0.05). Nitrogen levels significantly affected the number of leaves per plant of shallot with the highest value (27.84cm) obtained from 100 kg N ha -1 ,so statistically significant(p<0.05). There was no significant effect of interaction between nitrogen and intra-row spacing on leave number of shallot. Significantly largest stem diameter 0.63cm (p<0.50) was obtained from intra-row spacing of 20cm. But there was no interaction effect of nitrogen and spacing on the stem diameter of shallot. There was no interaction effect of nitrogen fertilizer and spacing on the bulb diameter of shallot. No significant difference was obtained with the interaction effect of nitrogen and spacing on shallot bulb weight. An increased N dose to 100kgha -1 resulted in the increased yield of shallot bulbs to 30.2 tha -1 which was significantly different from 0kgha -1 and 150kgha -1 (p<0.05). From this finding the highest growth performance of plant which leads to increased yield could be using 150kgha -1 and spacing of 20cm.However the conclusive recommendation should be based on the results of repeated experiments. Keywords: Shallot, Nitrogen, Spacing, Plant height, Leave number
Highlights
Shallot (Allium ascalonium L.)is an onion like plant that is originated from Western Asia
Dry bulbs planted a spacing of 20cm between plants and 35cm between rows and one large or two small bulbs are planted in each hill
In Ethiopia, they are planted during the rainy season and the tops of the sets are cut before planting
Summary
Shallot (Allium ascalonium L.)is an onion like plant that is originated from Western Asia. According to Tindal (1983), bulbs which are formed in clusters of four to eight can normally be harvested 60-100 days from planting by which time the leaves will have become yellow depending on the cultivar characteristics. The optimum use of spacing or plant population has dual advantage It avoids strong competition between plants for growth factor such as water, nutrient, and light. Improper spacing and the rate of nitrogen fertilizer applications are among the factors which affect crop emergence, growth and yield of shallot. To solve these problem or increase growth performance and seedling emergence; research is required to carry out to analyze or to assess the influences of factors listed above. The objective of this study was to determine the effect of spacing and nitrogen fertilizer for better yield of shallot and to determine the combination effect of nitrogen fertilizer rate and plant density on yield and yield component of shallot
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