EFFECT OF DIFFERENT PLANTING DENSITIES AND FERTILIZER RATES ON CORN YIELD AND YIELD COMPONENTS UNDER NORTHERN VIETNAM GROWING CONDITIONSLe Quy Tuong, Nguyen Tuan Khoi, Duong Van Quan, Bui Bao Thinh, Bui Danh Chung and Nguyen Cong ThanhAbstract Corn (Zea mays L.) is one of the vital cereals and grown all over the world as a major food source. Various studies on agricultural methods such as farming techniques, irrigation, fertilization, breeding have been conducted to increase corn yield. Planting density and fertilizer rate, in particular, are known and widely applied as the first method to increase corn yield. In this study, we observed the effect of planting densities and fertilizer rates on yield and yield components of NK4300 corn which was grown in northern Vietnam in the winter season. The experiment focused on density and fertilizer with a Split-plot arrangement having three replications. The results showed that the corn yield and yield components were significantly affected by the planting densities and fertilizer rates. Cob length, cob diameter, number of grain rows per cob, grain percentage per cob and 1000-Grain Weight varied considerably as the fertilizer rates and planting densities had changed. The number of grains per row was not affected by planting densities and fertilizer rates. The corn actual yield was influenced by different factors such as cob length, cob diameter, number of grain rows per cob, number of grains per row and 1000-Grain Weight. The actual yield of experimental treatments varies greatly from 40.27 quintals ha-1 to 73.46 quintals ha-1. The highest yield (73.46 quintals ha-1) could be obtained when combining the planting density of D2 (66 thousand plants ha-1) with F4 fertilizer rate (180kg N + 80kg P2O5 + 100kg K2O) ha-1.
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