혼합유박 시용량 및 시용시기가 토양환경과 미질에 미치는 영향

서지정보

· 발행기관 : 한국토양비료학회
· 수록지 정보 : 한국토양비료학회지(Korean Journal of Soil Science and Fertilizer) / 41권 / 2호 / 103 ~ 111페이지
· 저자명 : 양창휴, 김재덕, 정광용, 류철현, 김병수, 박우균

초록

This study was carried out to investigate the optimal application rate and time of mixed expeller cake
(MEC) for the replacement of chemical fertilizer. Dongjin-1, as cultivated rice was used at Fluvio-marine
deposit in Honam plain paddy field. Soil chemical properties were improved by the application of MEC.
Contents of total nitrogen and organic matter were higher in 70%, 100% plots of basal dressing than
standard fertilizer application (SFA) plot. Cation exchangeable capacity was highly increased in 70% plot
of basal dressing. Also, the content of organic matter in soil was increased with MEC application. Cation
exchangeable capacity, total nitrogen and available phosphate were decreased according to late application
time. The content of inorganic nitrogen in soil showed high tendency at more application rate of MEC, and
nitrogen mineralization at harvest season have finished in 50%, 70% plots of basal dressing. The content of
inorganic nitrogen in soil was increased according to late application time, however it was decreased in the
late period of growth. Leaf color value became darker with increased application rate of MEC. Leaf color
was dark green in MEC application plots at panicle formation stage, on the other hand, it was light green
in 50%, 70% plots of basal dressing at heading stage. SPAD reading value of leaf-color was high during the
whole growth stage in MEC application plots. More application rate of MEC showed higher tendency of
fertilizer nitrogen absorption. Nitrogen use efficiency was the highest in 70% plot of basal dressing.
Absorbed amount of fertilized nitrogen was increased in 10~15days before transplanting and nitrogen use
efficiency was high according to the late application time. The ratio of perfect kernel and the content of
protein on hulled rice showed high tendency at the less application rate of MEC. The ratio of head rice on
milled rice showed high tendency at the less application rate of MEC. Rice yield increased 4% in 100% and
70% plots of basal dressing compare with SFA (5.18 Mg ha-1) plot respectively. Ear and culm length of rice
were long according to the late application time, while the numbers of spikelet and ear were increased and
the percentage of ripened grain was decreased. Rice yield was increased 2~5% in all MEC application plots
compared to SFA plot and especially, increased 10~15days before transplanting in application plots. The
optimal application rate and time of MEC on normal paddy field in plain were concluded that 70% basal
dressing and 10~15days before transplanting

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