For a poster presentation at

ASA, CSSA, & SSSA International Annual Meetings, Tempa, Florida, USA, Nov. 3-6, 2013

Effect of Incorporation Timing of Green Manure Crops in Paddy Rice Field with Liquid Pig Manure Application on Rice Growth and Yield

to Minimize the Risk of Nutrient Leaching

Se-Won Kang¹, Dong-Cheol Seo¹, Sang-Gyu Lee¹, Young-Jin Seo¹, Ju-Wang Park¹, Ik-Won Choi¹, Jin-Hee Ryu², Hang-Won Kang², Jong-Soo Heo³, Ju-Sik Cho^1*

¹Department of Bio-Environmental Sciences, Sunchon National University, Sunchon, Korea,

²National Institute of Crop Science, Rural Development Administration,

³Division of Applied Life Science (BK21 program) & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Korea,

Abstract

Green manure crops were used for soil structure and organic matter accumulation. However to improve the biodiversity and crop yield, most organic farmers have cultivated green manure crops in farmlands during winter season after the harvest of a main crop. The effect of incorporation timing of green manure crops in paddy rice field with liquid pig manure application on rice growth and yield to minimize the risk of nutrient leaching was investigated from October, 2011 to September, 2012. The kinds of green manure crops were Hordeum vulgare L. (green barley, G) and Vicia villosa roth (hairy vetch, H). Incorporation timing of green manure crops was at 25 days (LPM1), 18 days (LPM2) and 11 days (LPM3) before rice transplantation. Biomass, inorganic elements (nitrogen, phosphorus and potassium) of green manure crops and yield of rice were investigated under different soil incorporation timing. The biomass of green barley and hairy vetch were great in the order of LPM3 ≧ LPM2 ≧ LPM1. Contents of inorganic elements (nitrogen, phosphorus and potassium) of green barley and hairy vetch increased at earlier incorporation time. Contents of nitrogen, phosphorus and potassium in LPM1 of green barley were 1.28, 0.38 and 1.45%, respectively. In LPM1 of Hairy vetch, contents of inorganic elements (nitrogen, phosphorus and potassium) were similar with inorganic elements of green barely. Yields of rice in treatment of two green manure crops were 526 kg 10a^-1 (increasing yield 3%) for LPM3 of green barely and 535 kg 10a^-1 (increasing yield 5%) for LPM3 of hairy vetch, respectively. Therefore, optimal incorporation timing of green manure crop was LPM3 of green barley and hairy vetch.

*Corresponding Author. Ju-Sik Cho, Department of Bio-Environmental Sciences, Sunchon National University in Korea.

Tel.: +8261-750-3297; Fax: +8261-752-8011; E-mail: chojs@sunchon.ac.kr.

Keywords: Biomass, Hordeum vulgare L., Inorganic element, Rice yield, Vivia villosa roth