돈분액비의 시용수준이 벼 생육과 품질 및 토양에 미치는 영향
Effects of Application Rates of Liquid Pig Manure on Rice Growth, Quality and Soil Properties
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The effects of liquid pig manure (LM) on the yield and quality of rice as well as soil chemical properties were determined in the field of sandy loam soil under the different fertilizer management. Treatments consisted of 100%, 130% and 160% N application rates of liquid manure as calculated on the basis of the recommended rate of nitrogen (9 kg N/10a) for rice cultivation. Chemical fertilizer (CF) was used as control. Concentrations of T-N and T-P in paddy water were measured by 5-day intervals up to 20days after application. LM treatments significantly increased T-N concentrations in paddy water proportionally with increasing rates of LM (13.2 to 25.7 mg/L). Similarly Total-P content in paddy water was increased right after LM applications but was well below the quality standard of wastewater and manure. Plant height and tillers in 100% and 130% N LM treatments were lower than those in CF control. In the 160% LM treatment, however, plant height and numbers of tillers were higher than those in the CF control. Yields in 100% LM and 160% LM plots were decreased by 3 and 5%, respectively, as compared with 422 kg per 10a in the CF plot. Rice protein contents were similar between 100% LM and CF control (about 6.8%) but it was increased to 7.2% and 7.7% in 130% LM and 160% LM treatments, respectively. Toyo-taste value in the 100% LM treatment was higher than in CF control plot. The proportions of perfect grain of the brown rice were lower in 130% LM and 160% LM treatments than that in CF control. Soil organic matter content, heavy metal and exchangeable cations were highest in the 160% LM plot. Thus considering yield and quality of rice and heavy metals contents in soil, 130% N basal application of liquid manure can be recommended for rice cultivation in this experiment.
Abstract
The effects of liquid pig manure (LM) on the yield and quality of rice as well as soil chemical properties were determined in the field of sandy loam soil under the different fertilizer management. Treatments consisted of 100%, 130% and 160% N application rates of liquid manure as calculated on the basis of the recommended rate of nitrogen (9 kg N/10a) for rice cultivation. Chemical fertilizer (CF) was used as control. Concentrations of T-N and T-P in paddy water were measured by 5-day intervals up to 20days after application. LM treatments significantly increased T-N concentrations in paddy water proportionally with increasing rates of LM (13.2 to 25.7 mg/L). Similarly Total-P content in paddy water was increased right after LM applications but was well below the quality standard of wastewater and manure. Plant height and tillers in 100% and 130% N LM treatments were lower than those in CF control. In the 160% LM treatment, however, plant height and numbers of tillers were higher than those in the CF control. Yields in 100% LM and 160% LM plots were decreased by 3 and 5%, respectively, as compared with 422 kg per 10a in the CF plot. Rice protein contents were similar between 100% LM and CF control (about 6.8%) but it was increased to 7.2% and 7.7% in 130% LM and 160% LM treatments, respectively. Toyo-taste value in the 100% LM treatment was higher than in CF control plot. The proportions of perfect grain of the brown rice were lower in 130% LM and 160% LM treatments than that in CF control. Soil organic matter content, heavy metal and exchangeable cations were highest in the 160% LM plot. Thus considering yield and quality of rice and heavy metals contents in soil, 130% N basal application of liquid manure can be recommended for rice cultivation in this experiment.
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