This study was carried out to investigate the effects of planting densities on the growth characteristics, dry matter yield, and feed value of “Geukdong 6” (a new variety of corn for feed). The experimental design was arranged in a randomized block design with three replications. Treatments consisted of six planting densities, 60 cm × 25 cm (T1), 60 cm × 30 cm (T2), 70 cm × 25 cm (T3), 70 cm × 30 cm (T4), 80 cm × 25 cm (T5) and 80 cm × 30 cm (T6). All treatments were sown on May 14, 2021, and the harvest was on October 3 (late flowering). Plant length and the number of tillers were the highest in T5 (p<0.05), but the number of leaves and stem diameter were the highest in T6 than in the other treatments (p<0.05). Leaf length, leaf width, and dead leaf were not significantly different among the treatments. Organic matter was highest in T6, and crude protein was highest in T5 (p<0.05). The ether extract was not significantly different among the treatments. Crude fiber, NDF, and ADF were highest in T2 with relatively higher planting density (p<0.05). Calcium and phosphorus were not significantly different among the treatments. TDN content was the highest in T3 (p<0.05). Sugar degree (Brix), fructose, glucose, dextran, isomerose, and inverted sugar were not significantly different among the treatment. Fresh yield, dry matter yield and TDN yield were higher in order of T6 > T5 > T4 > T3 > T2 > T1 (p<0.05). Relatively feed value was higher in order of T3 > T6 > T5 > T1 > T4 > T2 (p<0.05). Based on the above results, planting density could be recommended from 80 cm × 30 cm for efficient production of “Geukdong 6”.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
    1. Experimental site and treatment
    2. Crop establishment and field management
    3. Field data collection and laboratory analysis
    4. Statistical analysis
Ⅲ. Results and Discussion
    1. Effects of planting density on growth characteristics
    2. Effects of planting density on chemical compositions
    3. Effects of planting density on sugar contents
    4. Effects of planting density on yield and relative feedvalue
Ⅳ. CONCLUSION
Ⅴ. CONFLICT OF INTEREST
Ⅵ. REFERENCES

• Se Ho Lee(Department of Animal Science and Biotechnology, Kyungpook National University)
• Eun Joong Kim(Department of Animal Science and Biotechnology, Kyungpook National University)
• Sang Moo Lee(Department of Animal Science and Biotechnology, Kyungpook National University) Corresponding author