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Articles by L.K. Sam-Amoah
Total Records ( 5 ) for L.K. Sam-Amoah
  R.S. Amoah , L.K. Sam-Amoah , C. Adu Boahen and F. Duah
  Different varieties of cassava were processed into gari to determine the material losses and the rate of gari yield as they are affected by the age of maturity, varietal traits and the processing method and equipment. The varieties were harvested at the ages of 10, 12 and 14 months, respectively. The study showed that varietal differences and age at harvest of cassava roots have notable influences on the average yield of gari. Older cassava roots generally recorded higher gari yields. The material losses also varied across the unit operations. The average losses occurring independently at the various processing stages were: peeling losses, 27.87%; grating losses, 3.95%; dewatering losses, 24.42%; sifting losses, 2.37% and roasting losses, 18.29%. An average overall material loss of about 77% with gari yield of 23% of the fresh tuber weight were recorded. This translates into an average garification rate of 0.23 (23%) of the test equipment and processing method. This factor provides a numerical index for comparing the efficiencies of alternative gari processing methods and equipment in terms of the rate of gari yield.
  P.O. Boamah , L.K. Sam-Amoah and J.D. Owusu-Sekyere
  This research was conducted to determine the performance of two sprinkler heads and to use one of them to determine suitable irrigation interval for the optimum growth and yield of tomatoes. Technical evaluation of sprinkler system performance was done using the sprinkler heads, i.e., LEGO and AGROS and Parameters measured and their values for them were, respectively: Coefficient of Uniformity (CU), 98.05±0.21 and 99.20±0.13, Distribution Uniformity (DU) 17.00±3.00 and 57.67±5.51, Scheduling Coefficient (SC), 6.00±1.00 and 1.87±0.23, precipitation rate, 7.87±0.38 and 8.00±0.00, operating pressure, 0.18±0.25 and 0.18±0.01, Radius of throw, 0.53±0.06 and 0.53±0.06, Deep Percolation Ratio (DPR), 0.46±0.01 and 0.61±0.18, Depth of water, 5.69±01.0 and 5.93±0.18. AGROS performed better than LEGO in most parameters determined. Four irrigation intervals; one day (T1), 3 days (T2), 5 days (3) and 7 days (T4) were used. Tomato plants under T1 had a significantly higher stem diameter (2.85), fruit mass (45.00), fruit length (5.3), flower number (2.781), than those under the other treatments. Irrigation intervals of a day (T1) lead to the best growth and development of tomatoes.
  P.O. Boamah , J.D. Owusu-Sekyere , L.K. Sam-Amoah and B. Anderson
  The aim of the research was to determine the effect of irrigation interval on chlorophyll fluorescence of tomato (Lycopersicon esculentum Mill) under sprinkler irrigation using Compact Violet Laser-Induced Fluorosensor (CVLIF) to measure leaf photosynthetic performance. Four irrigation intervals; one day (T1), three days (T2), five days (T3) and seven days (T4) were used. Parameters measured were: Soil moisture content before and after irrigation, T1 (4.7), T2 (4.5), T3 (5.4), T4 (4.2) and T1 (15.1), T2 (15.1), T3 (13.6) and T4 (11.7), respectively; Fluorescence decrease ratio (Rfd) at F690 and F740, T1(2.465), T2(1.690), T3(1.998), T4(1.702) and T1 (1.929), T2 (1.205), T3 (1.241), T4 (1.101), respectively and adaptability (AP), T1 (0.155), T2 (0.180), T3 (0.253), T4 (0.222). Irrigation interval of five days, using the same amount of irrigation water was physiologically (in terms of adaptability) better than 1, 3 and 7 and adaptability could be used as an effective parameter to estimate the water status of tomatoes under various environmental stress conditions.
  M. Takase , J.D. Owusu-Sekyere and L.K. Sam-Amoah
  This study was conducted to examine the effects of four sources of water on the growth of tomato (Lycopersicon esculentum) at Kpong in the Manya Krobo District of Eastern Region in Ghana. The sources of irrigation water were: river, canal, tap and well. The quality of these sources was monitored for a period of five months (August-December 2007). Sampling of the water was done every 6 days in each month. Samples from each of the source taken were sent to the laboratory for analysis. Each water source was used to irrigate tomatoes planted in the field using Randomized Completely Block Design (RCBD) as the experimental design for a period of three month. The treatments were four (river, canal, tap and well) with four replications. During the growing period, soil fertility status was monitored for a period of three months. This was done by taking two core samples from each of the plots before planting of the tomato and subsequent samples taken at the same spots monthly, after planting, for a period of three months and sent for analysis. During this period, plant height, number of flowers and fruits were determined. Weights of fruits were determined in the third. River water proved be the most preferred source for irrigation by virtue of the fact that its plants heights were higher, number of fruits were more than the other sources as well as the weightier mean number of the fruits obtained from the plants.
  M. Takase , L.K. Sam-Amoah and J.D. Owusu-Sekyere
  The aim of the study was to examine the effects of four sources of irrigation water on soil chemical and physical properties at Kpong in the Manya Krobo District. The chemical and physical variables were measured using the top soil (0-15 cm) to compare soils irrigated with four sources of water. The sources of irrigation water used by the farmers in the District include: river, canal, tap and well. Each water source was used to irrigate tomatoes. Chemical variables determined were: soil pH, Electrical Conductivity (EC), Sodium (Na), Magnesium (Mg) and % total NH4-N. These variables were monitored for a period of three months. Two core samples were taken from each of the plots before planting of the tomato and subsequent samples taken at the same spots monthly, after planting, for a period of three months and sent for analysis. Water quality was established according to its chemical composition. The pH decreased (from 6.6 to 6.4 in T4 and from 6.6 to 6.2 in T3), EC (from 4.1 to 3.7 ds m-1 in T3), Na+ (from 13 to 11.5 cmol kg-1 in T3 and from 13 to 12.4 cmol kg-1 in T4), Ca (from 36.5 to 32.05 cmol kg-1 in T3 and from 36.5 to 33.9 cmol kg-1 in T4), Mg (from 9.2 to 8.3 cmol kg-1 in T3 and from 9.2 to 8.67 cmol kg-1 in T2) and % total NH4-N (from 0.25 to 0.2 in T4 and from 0.25 to 0.16 in T3). Continuous irrigation lowered values of the variables and values of soil nutrient. However, the water quality and soil chemical and physical data suggest that the sodification process and the increased soil erosion risk must be controlled in order to achieve a sustainable high production system. Soils irrigated with river water was the most preferred for growing tomato by virtue of their optimum level of pH, EC, Na, Mg and NH4-N.
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