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Articles by I.K. Addai
Total Records ( 3 ) for I.K. Addai
  I.K. Addai and O. Safo- Kantanka
  Various forms of accelerated ageing tests have been used to evaluate storability of seed lots but very little work has been done on how these tests correlate or relate well with ambient storage and their effectiveness in selecting for seed storability. In this study, hundred seeds each from three soybean genotypes were subjected to three accelerated ageing tests by soaking the seeds in 20% ethanol solution for two hours, in 20% methanol solution for two hours or in 75°C hot water for seventy seconds. The same quantity of seeds was stored on laboratory wooden shelves for a period of four months at a temperature range of 22-25°C and 30-35% relative humidity. Germination percentage of seeds from these four categories revealed that the ethanol solution predicted seed storability more than hot water and methanol treatments. In another experiment, seeds from individual M2 plants were screened either by using the ethanol test or by storing threshed and unthreshed seeds at a temperature range of 22-25°C and relative humidity of 30-35% for a period of four months. Only the M2 plants whose seeds produced germination percentage of 80% or above were selected. Compared to the two ambient storage methods, the ethanol solution was less effective a screening method for improved seed storability but could be used as an initial screening method to predict seed storability in soybeans. However, storability of such seeds should always be confirmed by storage under ambient conditions especially in later generations of selection.
  I.K. Addai and D.K. Anning
  Studies were conducted during the 2013 and 2014 cropping seasons at the research field of the University for Development Studies, Nyankpala in the Northern Region of Ghana to determine the effects of bulb size at planting and NPK 15:15:15 application rate on growth and yield of onion. The NPK 15:15:15 was applied at the rate of 0 (control), 80, 165 and 250 kg ha–1. Three different bulb sizes: small (2.5-3.5 cm), medium (4.5-5.5 cm) and large (6.5-8.5 cm) were used. The treatment combinations were laid out in a randomized complete block design with three replications. Leaf length, number of sprouts and leaf number were measured from 1-7 weeks after planting. Also individual bulb fresh weight, cluster bulb fresh weight and number of bulbs were measured at harvest. Results indicated that the plants produced from large bulbs produced the highest vegetative growth whilst those from small bulbs recorded the least growth. The application of 80 kg ha–1 of NPK 15:15:15 produced the highest number and fresh weight of bulbs at harvest whilst plants produced from small bulbs fertilized with 250 kg ha–1 recorded the least bulb yield at harvest.
  I.K. Addai and M. Alimiyawo
  Studies were conducted during the 2013 and 2014 cropping seasons at the University for Development Studies, Nyankpala, Ghana to determine leaf area indices of three Sorghum (Sorghum bicolor (L.) Moench) varieties using the graphical approach. Three varieties viz., Kapala, Kadaga and Dorado were planted and applied with three rates: 0-0-0, 45-30-30, 35-20-20 and 45:30:30 of N, P and K, respectively. Treatment combinations were replicated three times in RCBD. Results indicated that the application of N, P and K at 45:30:30 or 35-20-20 to variety Dorado or Kadaga significantly increased leaf number, seed weight, grain yield and LAI of Sorghum. The data also showed that LAI correlated positively with panicle length and number of leaves. The relationships between LAI and 100 seed weight and LAI and grain yield were also high but negative. The leaf area constants for Sorghum have been developed and were found to be 0.723, 0.661 and 0.545, respectively, for varieties Kadaga, Kapala and Dorado. They can be used by researchers in computing LAI to predict growth and development of Sorghum. Farmers in the study area who cultivate Dorado or Kadaga should apply N, P and K at 45:30:30 to increase growth and yield of Sorghum.
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