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Articles by Jong Myung Choi
Total Records ( 2 ) for Jong Myung Choi
  Zineb Regagba , Jong Myung Choi , Amina Latigui , Khalladi Mederbal and Ahmed Latigui
  The effect of the variation of Mg concentration (MgC) 0, 0.5, 1, 2, 4 and 6 meq.L-1 in the Nutrient Solution (NS) on strawberry (Fragaria×ananassa Duch.) “Seolhyang” growth was evaluated at 120 days after transplantation of runners. The effect of Mg-deficiency, first seen by the appearance of necrosis in the old leaves. On young leaves a spotted brown or brown area developed on the interveinal area with spotted marginal browning or marginal necrosis. The greatest application of 6 meq.L-1 of Mg in NS caused a reduction in pigmentation and suppressed plant growth severely. The MgC 2 meq.L-1 resulted in the relatively highest vegetative growth with a favorable Electrical Conductivity (EC) and pH, for a better growth and nutrients uptake. The Dry Weight (DW) and Fresh Weight (FW) were weakly correlated with variation of MgC (R2 = 0.024 and 0.16, respectively). The response to the variation of MgC on the EC and pH were also, weakly correlated (R2 = 0.15 and 0.21, respectively). The MgC 2 meq.L-1compounded initially by 5 K+, 5 Ca2+ 2 Mg2+, 1 Na+, 10 NO3-, 2SO42, 1 H2PO4- with a pH 6.5, EC =2.2 dS m-1, K+/(Ca2++Mg2+) = 0.71 and Σcations = Σanions (13 meq.L-1) was improved by decreasing a pH, by adding NH4+ in NS and by adjusting the ratio cited to around 0.61. Depending of the results of this study, the new solution improved is compounded by 5 Ca2+, 4.5 K+, 2.3 Mg2+, 2.5 NH4+, 5 NO3-, 2.3SO42- and 1 H2PO4-with Σcations = Σcations (14.3 meq.L-1), a pH6 and EC = 2.3 dS m-1.
  Ahmed Latigui , Jong Myung Choi , Zineb Regagba , Daniella Meyer Allevato and Amina Latigui
  The Co-Compostage (CC) of Palm (Poenix dactylifera L.) Fiber (PF) and Sewage Sludge (SS) at volume rate (1PF/1SS), mixed with Top Soil (TS) have been used as a substrate for cucumber cultivated in soilless crop system. Five substrates with volume ratio T (CC-TS) were tested: T (10-0), T (9-1), T (8-2), T (7-3) and T (6-4). They were compared to peat in nursery and to TS in Cucumis sativus L. crop production. Total porosity, bulk density, moisture content, rate of drainage, pH and electritical conductivity of T (8-2) and T (7-3) were relatively favorable for plant growth. After 45 days of growth and in comparison to peat, T (9-1), T (8-2) and T (7-3) gave the best parameters of root development: volume, architecture, length, number, best seedling growth and a positive correlation (R = 0.751) between root and shoot dry matter. After 120 days, cucumber attained the best root development under T (8-2) and T (7-3). Fruits production of these substrates was 40% higher than those of the control.
 
 
 
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