Horticultural Science
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Item Effect of Nitrogen and Intra Row Spacing on Growth and Head Yield of Cabbage (Brassica oleracea L. Var. capitata) at Bako Agricultural Polytechnic College, West Shewa, Ethiopia(Hawassa University College of Agriculture, 2022) CHIMDESSA WAKUMA GELDASSALow soil fertility and spacing are considered as serious problems among several production limiting factors in cabbage crop production. Nitrogen is one of the critical plant nutrients in cabbage yield and its information in relation to plant spacing in the study area is very limited. The current study aimed to evaluate the effect of nitrogen fertilizer rate and intra row spacing on growth and head yield of cabbage under field conditions. Thus, field experiment was conducted at Bako Agricultural Polytechnic College, West Shewa zone of Oromia National and Regional state during the wet season of 2021/2022. The treatments consisted of four levels nitrogen rate (0, 50, 100 and 150 kg/ha) and three intra row spacing (15, 25 and 35 cm) which were laid down in a Randomized Complete Block Design (RCBD) with three replications. Data on phenology, growth and yield components of cabbage were collected and analysis of variance was done using SAS version 9.3. The results revealed that some of the growth and yield related parameters of cabbage were significantly influenced by rate of nitrogen and intra row spacing. Days to maturity, number of leaf before heading, plant height, head diameter, leaf area, above ground plant fresh weight, marketable weight, unmarketable weight, tota yield, dry matter and head firmness were very highly significantly (p < 0.001) affected by the treatment combination. The highest marktable head weight (80.40 t/ha) were obtained at the combination of 150 kg/ha nitrogen rate with 35 cm intra row spacing where as the lowest (33.00 t/ha) were recorded in plots that received no nitrogen rate with 15 cm intra row spacing. The highest (82.00 t/ha) and lowest (37.99 t/ha) total head yield was recorded by treatment combination of 150 kg/ha nitrogen fertilizer with 35 cm intra row spacing and no nitrogen fertilizer rate with 25 cm intra row spacing, respectively. Larger leaf number before heading (15.67), longer plant height (35.97 cm), wider head diameter (17.84 cm) and wider leaf area (441.12 cm 2 ) were recorded at higher (150 kg/ha) nitrogen fertilizer rate. Plant height, head diameter, above ground plat fresh weight and marktable head weight were found superior at 35 cm intra row spacing. Result of current study shown that 150 kg/ha nitrogen fertilizer rate and 35 cm intra row spacing can be used for higher marketable head yield of cabbage. But future study need to be designed to be carried out at different locations and seasons so as to come up with valid recommendation.