Aim: To determine the correlation between the growth and yield parameters of cabbage grown with organic manure and inorganic fertilizer. Study Design: The experimental design consist of randomized complete block design with five treatments which were replicated four times. Location and Duration: The experiment was conducted at the experimental field of Federal College of Forestry, Jos, during the 2018/2019 raining season. Methods: Land clearing was done and the land was properly demarcated based on the different treatments and replicates. Cabbage seeds were first planted in a nursery bed and later transplanted onto the experimental plots. Data was taken on the plant height, leaf count, cabbage head diameter and head weight. The data collected were subjected to analysis of variance (ANOVA) using SPSS version 23 and Duncan Multiple Range Test, used to separate the means were significance occurred. Results: The result of the correlation coefficient of growth and yield showed that a strong correlation exist between plant height and cabbage head weight (r = 0.681 and 0.648) at P ≤ 0.01. Plant height was also positively correlated with head weight (r = 0.365, P ≤ 0.05) and head weight was as well and positively correlated with head diameter at (r = 0.501, P ≤ 0.05). Conclusion: Based on the results obtained, it can be concluded that application of organic manure and inorganic fertilizer has positive correlations between the growth and the yield parameters of cabbage.

The experiment was carried out in the demonstration farm of Federal College of Forestry Jos during the 2019 farming season to determine the effects of NPK fertilizer rates and vine cutting lengths on the growth and yield of sweet potato. The treatments include, three rates of NPK fertilizer (0, 0.2 and 0.4 kg) allocated to the main plot and two vine cutting lengths of (30 and 40 cm) in the sub plot in 3 x 2 factorial split plot design. The parameters assessed includes; number of branches, length of vine, leaf count, leaf area index and vine girth at 2, 4, 6, 8 and 10 weeks after fertilizer application (WAFA) and tuber count, tuber length, and yield weight at harvest. The parameters were subjected to analysis of variance and the means separated using the LSD (Least significant difference) at (p≤0.05). The results on the number of branches shows significant difference at 2 and 6 (WAFA) and at 4 WAFA for both treatments and positive interaction at 8 WAFA. Vine length showed no statistical difference at 4 WAFA, but significance at 2 and 8 WAFA with positive interaction at same weeks. The results on leaf count showed significance across the weeks with fertilizer rates and at 2 WAFA with vine cuttings with no interactions across the trend. The leaf area index showed no statistical difference with all the treatments as indicated. The vine girth showed significant difference across the weeks with fertilizer rates, and at 10 WAFA with the vine cuttings with no interactions. The yield parameters showed significance and positive interaction across with both treatments on tuber count, tuber weight and tuber length respectively. In conclusion, these results indicated that planting sweet potato in Jos plateau with a fertilizer rates of (0.4 kg/2m2 experimental plot) and 40 cm vine length could impact the growth and yield positively.