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The experiment was carried out at Federal College of Forestry Jos, in Jos North Local Government Area of Plateau State to determine the phytotoxicity of cypermethrin pesticide on seed germination, growth and yield parameters of cowpea. Cypermethrin is popularly used by farmers as a means of treating seeds before planting to prevent insect, pest and birds attack. Randomized Complete Block Design (RCBD) involving 5 treatments T0 as control (No cypermethrin used), T1 with 0.25% cypermethrin (0.25ml of cypermethrin in 99.75ml of water), T2 with 0.50% cypermethrin (0.50ml of cypermethrin in 99.50ml of water), T3 with 0.75% cypermethrin (0.75ml of cypermethrin in 99.25ml of water) and T4 contained 1.00% cypermethrin (1.0ml of cypermethrin in 99.00ml water). Data was collected on radicle length, plumule length, number of leaves, number of branches, stem girth, number of seeds/pod, 100 seed weight, pod length and dry matter. Data collected was subjected to analysis of variance (ANOVA) at 5% level of significance using SPSS 23 and where significance was declared, Duncan Multiple Range Test (DMRT) was used to separate the means. The result of the research indicates that significance difference occurs in the radicle length (P<0.05) in which T1 has the highest mean value. The stem girth shows a significance difference with T0 having the highest mean value (7.32) at P<0.05. The result for the number of branches and the number of leaves shows significance difference with T0 having the highest mean values 39.15 and 101.65 respectively at P<0.05 level of significance. The yield parameters shows a significance difference for number of seeds/pod, 100 seed weight, pod length, as well as the total dry matter. The highest mean values for the yield parameters are observed in T0 with mean values 18.52, 18.53, 16.35 and 68.35 for number of seeds/pod, 100 seed weight, pod length and total dry mass respectively. Alpha amylase enzyme activity was observed to be higher at lower concentration of the cypermethrin (T1) on day 2 (2.75) but the increase in the enzyme activity tilted towards the highest concentration (T4) on day 3 and day 4 with mean value 2.70 and 3.10 at 5% level of significance.

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This research work was carried out at the experimental plot of Federal College of Forestry, Jos, Plateau, State, Nigeria. The experiment was laid out in a randomized complete block design (RCBD) comprising of four treatments; T0 as the Control (Ridges tillage), T1 (Zero-Tillage), T2 (Mound tillage) and T3 (Flat tillage) replicated three times. Data was recorded on leaf area, plant height, leaf cover area, number of stems, number of leaves and yield. The result showed that the treatments had significant effect on plant height T3 (Flat tillage) having the highest (34cm) mean plant height, while T1 (Zero tillage) has the least (26cm) mean plant height. Number of stem T3 (Flat tillage) also having the highest (14.8) number of stem while T1 (Zero tillage) has the least (9.7) number of stem. Number of leaves T3 (Flat tillage) also having the highest (289) number of leaves while T1 (Zero tillage) has the least (215) number of leaves. Leaf area T3 (Flat tillage) also having the highest (645.1cm 2 ) of leaf area while T1 (Zero tillage) has the least (467.1cm 2 ) leaf area. Plant cover area T3 (Flat tillage) having the highest (4503.3cm 2 ) plant cover area while T1 (Zero tillage) has the least (2147.0cm 2 ) plant cover area. For yield, T0 (ridges tillage) having the highest (8.6Kg) yield, followed by T2 (mound tillage), T3 (Flat tillage) and T1 (Zero tillage) which has the lowest (4.7Kg) yield. It can be concluded that ridges as the form of tillage could be the best practice for the growth and yield of Solanum tuberosum on the Jos Plateau.

The field experiment was conducted in the Federal College of Forestry, Jos Plateau state demonstration farm to determine the effect of single super phosphate (SSP) fertilizer on the growth and yield of Bambara groundnut. A Randomized Complete Block Design (RCBD) was used involving 5 treatments; T 1 (60kg/ha SSP as control), T 2 (100kg/ha SSP), T 3 (80kg/ha SSP), T 4 (40kg/ha SSP) and T 5 (20kg/ha SSP). Each treatment was replicated 3 times. Analysis of variance (ANOVA) was used in analyzing the result and where significance was decalred, Fisher LSD method was used to separate the means. Data was collected on plant height, leaf count, leaf area, branch count and yield. Significant difference was obtained between the treatments for the growth and yield of Bambara groundnut. The result indicates that the highest plant height of 27.05cm and leaf area of 25.28cm 2 were obtained at T3 respectively. The highest leaf count and branch count of 114.85 and 38.24 were observed at T1. T2 has the highest (32.40) flower count. The highest yield of 11.37Kg/m 2 was obtained at T1. Therefore, the result is an indication that T 1 level is adequate for the growth and yield of Bambara groundnut. Therefore, famers can go into Bambara groundnut production as it has low level of fertilizer intake due to its nitrogen fixing ability, drought tolerant, and hasvery low effect from pest and diseases and it serve as a protein supplement.