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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.

본 연구는 사일리지용 수수${\times}$수단그라스 교잡종을 파종 한 후 배수로 깊이를 0 cm, 20 cm, 40 cm 그리고 60 cm로 처리하고 이에 따른 생육특성, 수량성 및 영양적 특성을 비교 검토하였다. 초장, 엽장 및 엽수는 처리구에 따라 유의적인 차이가 나타나지 않았지만, 엽폭은 배수로 깊이가 깊을수록 유의적으로 커지는 것으로 나타났다(p<0.05). 그리고 하고엽 발생 수는 60cm > 0cm > 40cm > 20cm구 순으로, 녹색도는 20cm > 40cm > 0cm > 60cm 구 순으로 높게 나타났다(p<0.05). 경의 굵기와 경도는 배수로 깊이가 깊을수록 유의적으로 높아지는 것으로 나타났다(p<0.05). 생초수량, 건물수량 및 TDN 수량에서도 배수로 깊이가 깊을수록 유의적으로 높은 수량성을 나타냈다(p<0.05). 조단백질 및 TDN 함량은 40cm구가 가장 높게 나타났다(p<0.05). 조회분 함량은 20cm > 40cm >0cm > 60cm 순으로 높게 나타났다(p<0.05). ADF 및 NDF 함량은 0cm 처리구에서 높게 나타났다 (p<0.05). 총 무기물 함량은 20cm > 0cm > 40cm > 60cm구 순으로, 유리당(fructose, glucose and sucrose) 함량은 0cm > 20cm > 40cm > 60cm구 순으로 높게 나타났다(p<0.05). 구성아미노산 함량은 20 cm구가 가장 높게 60cm구가 가장 낮게 나타났다(p<0.05). 이상의 결과를 종합해 볼 때, 처리구에 따라 성분(조단백질, TDN, 무기물, 유리당 및 구성아미노산) 함량은 차이가 있지만, 건물 수량 및 TDN 수량을 고려한다면 저지대 논 토양에서 수수${\times}$수단그라스 교잡종 재배는 배수로 깊이를 60cm 정도로 하는 것이 유리하다.

Keywords

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