Effects of Organic Materials and Precipitation on Nitrogen Uptake Efficiency in Sorghum ${\times}$ Sudangrass Hybrid

유기자재와 강수량이 수수${\times}$수단그라스 교잡종의 질소이용효율에 미치는 영향

  • 최현석 (국립농업과학원 유기농업과) ;
  • 이연 (국립농업과학원 유기농업과) ;
  • 정정아 (국립농업과학원 유기농업과) ;
  • 지형진 (국립농업과학원 유기농업과) ;
  • 이상민 (국립농업과학원 유기농업과) ;
  • 국용인 (순천대학교 자원식물개발학과) ;
  • 정석규 (경희대학교 한방재료가공학과)
  • Received : 2012.06.28
  • Accepted : 2012.09.21
  • Published : 2012.09.28

Abstract

This study was conducted to evaluate soil inorganic N concentrations and N uptake efficiency of sorghum ${\times}$ sudangrass hybrid (Sorghum bicolor (L.) Moench) as affected by organic nutrient sources from 2009 to 2011. The treatments included chemical fertilizer, compost, oilcake, alfalfa hay mulch, and control. Nutrient applications were made at rates equivalent to approximately 210 kg of actual N per hectare. The precipitation during the growth period from May to September was higher in 2011, followed by 2009, and 2010. Oilcake had the lowest C:N ratio in the raw materials. Compost treatment slowed N-mineralization rate in soil during the measured years. Soil mineral nutrition and dry matter production were not consistently affected by treatments, but the dry matter production was negatively correlated with the amount of precipitation from May to September for three years. Chemical fertilizer treatment increased N efficiency in plants in the first two years, observing with lower N efficiency in plants treated with compost for 3 years. Increased precipitation from June to August improved N efficiency in sudangrass plants treated with compost but reduced the efficiency with the chemical fertilizer. Total dry matter production and N efficiency in plants were not affected by the C:N ratio of the raw materials rather than weather condition.

Acknowledgement

Supported by : 국립농업과학원

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