• 한국토양비료학회지
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• 제37권3호
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• pp.149-155
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• 2004

벼 양파 작부체계를 갖는 평택통의 미사질 식양토에서 화학비료의 시용량 절감을 목적으로 돈분뇨액비의 활용 가능성을 검토하였다. 벼 재배지에 사용된 액비는 $N\;3.8g\;kg^{-1}$, $P_2O_5\;1.8g\;kg^{-1}$, $K_2O\;2.7g\;kg^{-1}$을 함유하였고 양파 재배지에 사용된 액비는 $N\;4.9g\;kg^{-1}$, $P_2O_5\;1.4g\;kg^{-1}$, $K_2O\;2.1g\;kg^{-1}$을 함유하였다. 토양 pH는 모든 처리구에서 벼 수확 후 0.2-0.3 정도 상승하였다. 벼 생육과 수량은 화학비료구와 돈분뇨액비 시용구 간에 유의적인 차이가 없었다. 돈분뇨액비를 전량 기비로 시용하였을 때 양파의 중 후기 생육이 불량하였으나 액비기비 + 화학비료추비구와 화학비료구에서의 생육 차이는 없었다. 액비기비 + 화학비료추비구에서 수확기 양파의 양분흡수량는 화학비료표준시비구와 유의적인 차이가 없었다. 양파 수량은 앞그루 벼의 재배 시 화학비료를 시용한 조건에서 액비기비 및 화학비료추비 처리한 구에서 $58.5Mg\;ha^{-1}$로 가장 많았으나 액비전량기비구와 무비구를 제외한 다른 처리구와의 유의적인 차이는 없었다. 이상의 결과를 볼 때 벼 양파 작부체계에서 돈분뇨액비를 활용할 경우 벼 재배 시에는 화학비료를 전량 절감할 수 있었으나 양파는 수량성을 유지하기 위해 돈분뇨액비를 기비기준량으로 시용하고 월동 후 화학비료의 추비가 필요하였다.

• 농업과학연구
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• 제45권3호
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• pp.355-363
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• 2018

This study was conducted to investigate suitable rice cultivars for various rice based cropping systems in a paddy field in the Yeongnam plain area. Thirteen rice cultivars (5 early, 3 medium and 5 mid-late maturing cultivars) and three transplanting dates (June 5, June 25 and July 5) were evaluated in this study. The mid-late and early maturing cultivars for the July 5 and June 25 transplanting headed before August 30 which is the safe heading date in the Yeongnam plain area, ranging from Aug. 26 - 28 and Aug. 18 - 23, respectively. The safe harvest time of rice for double and triple cropping systems should be before the middle of October for the cultivation of the succeeding winter crops. The rice yield was the highest for the June 5 transplanting regardless of the rice cultivars, and it gradually decreased as the transplanting date was delayed from June 5 to July 5 due to a decrease in the spikelet numbers per panicle number and in the ripened grain rate. In contrast, the other yield parameters that include the panicle number per $m^2$, the 1,000-brown rice weight, and the ripened grain ratio were not significantly affected. The result indicates that based on the milled rice, heading time and harvest time, a medium maturing cultivar (Haiami and Samdeog) would be applicable to a winter barley/wheat, garlic/onion-summer rice double cropping, while a mid-late cultivar (Saeilmi, Saenuri and Hyunpoom) would be suitable for a spring potato/waxy corn-summer rice double cropping in the Yeongnam plain area. On the other hand, an early maturing cultivar (Unkwang, Jokwang and Haedamssal) would be preferable for a triple cropping because of the short growth period of rice.

• 식물병과 농업
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• 제5권2호
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• pp.77-83
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• 1999

In 1997 surveys 82 out of 180 crucifer fields were infected with clubroot disease in a range of 1-100% of diseased plants and among crucifier crops Chinese cabbage was the most severe, In cropping systems Chinese cabbage-monocropping of Chinese cabbage-radish were found to be most common in major Chinese cabbage production areas. Welsh onion squash or paddy rice were also planted between cropping of Chinese cabbage. Paddy fields converted to upland were lowered in incidence of clubroot disease and fields with loam to silty loam soil were more severe in disease than those with sandy soil. Soil pH and organic contents were nor related to clubroot disease severity. Soil fauua such as total fungi bacteria actinomyces Pseudomonads and Bascillus were not correlated with severity of the disease. Root rall development on Chinese cabbage seedlings was initifially observed under a microscope 13 days after inoculation with Plasmodiophora brassicae but 18 days by naked eyes after inoculation. Root galls were formed mostly around collar roots and gradually spread to main root lateral roots and secondary root branches. Root galls started to enlarge greatly in size and weight from 23 days after inoculation. Chinese cabbage plants at mid-growth stage with root gall development were reduced to 1/2 of that of healthy plants in number of leaves 1/4-1/5 in above ground fresh weight 1/6 in root length but increased to 3 times in diameter of collar root. Diseased plants had little root hairs. Diseased Chinese cabbage plants at harvest were reduced by 9,1-11.8% in head weight compared to healthy plants a positive correlation was observed between root and head weight but those relationships were rot found in the diseased plants.

• 한국환경농학회지
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• 제31권4호
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• pp.293-299
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• 2012

본 연구에서는 화학비료와 퇴비를 과다하게 투입하여 인산의 집적 및 유출 위험성이 높은 양파-벼 재배지와 시설재배지의 인산 집적 특성과 인산가수분해효소를 이용한 집적 인산의 수계에서의 생물이용가능성을 평가하였다. 수용성 인산 중 많은 부분의 유기태 인산이 주변 수계에 유출될 위험성이 높았지만 그동안 제대로 평가되지 못했다. 본 연구결과에서 alkaline phosphomonoesterase와 phosphodiesterase에 의해 이모작토양에서 DUP의 12, 24%가 시설재배지 토양에서 DUP의 18과 44%가 분해되는 것으로 나타났다. 토양에 축적된 유기태 인산중 orthophosphate monoester와 diester가 주로 인산분해효소에 의해 분해되어 농경지 주변 수계로 유출시 생물 이용 가능성이 큰 것으로 평가되었다. 따라서 수계에서 인산의 거동을 이해할 때 유기태 인산에 대한 충분한 고려가 필요할 것이다.