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Effects of Drainage Depths on Agronomic Characteristics, Yield and Feed Value of Sorghum × Sudangrass Hybrid for Silage in the Paddy Field of Lowland

저지대 논 토양에서 배수로 깊이가 사일리지용 수수×수단그라스 교잡종의 생육특성, 수량 및 사료가치에 미치는 영향

  • Lee, Sang Moo (Department of Animal Science, Kyungpook National University)
  • Received : 2019.04.16
  • Accepted : 2019.05.27
  • Published : 2019.06.30

Abstract

This study was carried out to investigate the growth characteristics, yield and feed value of Sorghum${\times}$Sudangrass hybrid for silage according to the drainage depths in the paddy field of lowland. The experimental design was arranged in a randomized block design with four treatments and three replication. The drainage depths of four treatments were 0cm, 20cm, 40cm and 60cm, respectively. Plant length, leaf length and leaf number were not significantly different, but leaf width increased as the higher the drainage depth(p<0.05). The number of dead leaf was higher in the order of $60cm>0cm{\geq}40cm{\geq}20cm$ treatment(p<0.05). Green degree was higher in the order of 20cm > 40cm > 0cm > 60cm treatment(p<0.05). Stem diameter and stem hardness increased significantly as drainage depth increased from 0cm to 60cm(p<0.05). Also, fresh yield, dry matter yield and TDN yield increased as the higher the drainage depth(p<0.05). Crude protein and TDN content were the highest in 40cm treatment(p<0.05). Crude ash was higher in the order of 20cm > 40cm > 0cm > 60cm treatment(p<0.05). ADF and NDF content were the highest in 0cm treatment(p<0.05). Total mineral content was higher in the order of 20cm > 0cm > 40cm > 60cm(p<0.05). Free sugar content(fructose, glucose and sucrose) was the highest in 0cm treatment(p<0.05). Total amino acid(EAA+NEAA) was higher in 40cm than the other treatments(p<0.05). There is a difference in the content of ingredients(crude protein, TDN, mineral, free sugar and amino acid) according to the treatments. But considering dry matter yield and TDN yield, Sorghum${\times}$Sudangrass hybrid cultivation is advantageous to set the drainage depth of about 60cm in the paddy field of lowland.

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