• Journal of Biosystems Engineering
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• 제30권6호통권113호
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• pp.360-365
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• 2005

Precision agriculture attempts to improve cropping efficiency by variable application of crop treatments such as fertilizers and pesticides, within field on a point-by-point basis. Therefore, a more complete understanding of the relationships between yield and soil properties is of critical importance in precision agriculture. In this study, the functional relationships between measured soil properties and rice yield were investigated. A supervised back-propagation neural network model was employed to relate soil chemical properties and rice yields on a point-by point basis, within individual site-years. As a results, a positive correlation was found between practical yields and predicted yields in 1999, 2000, 2001, and 2002 are 0.916, 0.879, 0.800 and 0.789, respectively. The results showed that significant overfitting for yields with only the soil chemical properties occurred so that more of environmental factors, such as climatological data, variety, cultivation method etc., would be required to predict the yield more accurately.

• 한국약용작물학회지
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• 제26권5호
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• pp.354-361
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• 2018

Background: This study was conducted to investigate the growth characteristics, root yield and curcuminoid content of turmeric (Curcuma longa L.), cultivated using mother seed rhizomes (MR) and finger seed rhizome (FR) of different sizes. MR are attached to the stem, and FR are connected to the MR, and are used as a general seed rhizome. Methods and Results: Seed rhizomes of different types and sizes were used: large, medium and small for FR, and large, half-sized, and small for MR. These were assigned to the experimental groups and cultivated under greenhouse conditions. The growth characteristics, root yield, and curcuminoid content did not show clear difference between MR and FR, but suggest that the larger seed rhizomes (above 30 g) could have higher root yields. On average, harvested mother rhizomes (HMR) contained more curcuminoid than harvested finger rhizomes (HFR), while the yield of HFR was higher than that of HMR. The higher weight of harvested roots correlated significantly with elevated curcuminoid content. Conclusions: The two seed rhizomes, MR and FR, did not differ in root yield and curcuminoid contents, but larger seed rhizomes may produce better root yields. This suggest that the optimum seed rhizome is larger FR, to produce higher yields and quality in turmeric root production.

• 한국작물학회지
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• 제23권2호
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• pp.126-132
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• 1978

To examine the effects of P.E. film and rice straw mulching on fall grown potato(Shimabara cultivar) in the middle region of Korea, sprouted seed tuber pieces were transplanted with six kinds of mulching treatments on 24th July and harvested on 25th October. P.E. film mulching from transplanting resulted the perfect rot of transplanted seed pieces due to the excessive high soil temperature (noon soil temperature of about 4$0^{\circ}C$ continued until the middle of August). P.E. film mulching from 15th September to harvest increased the marketable tuber yields by 35% due to the raising of soil temperature by 1-3$^{\circ}C$ and maintaining of available soil moisture in dry season. Rice straw (whole or cut in 10cm length) mulching lowered the soil temperature in hot season and raised it in cool season and maintained available soil moisture in dry season. Therefore better emergence, growth and yields were induced. Effects of whole straw, whole growing season and thicker mulching were greater than cut straw, half growing season and thinner mulching. 6cm mulching of whole or cut straw during whole growing season resulted the increasing of marketable tuber yields by 56 or 48%.

• 한국작물학회지
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• 제48권1호
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• pp.25-30
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• 2003

This research was conducted to compare the dry matter production and the yield productivity among nine soybean cultivars by measuring the photosynthetic ability of the middle and lower leaves at the flowering and the seed development stages. The leaf greenness(SPAD value) were ranged as 32-42 at the flowering stage. Also, They were ranged as 25-40 and 38-51 at the fifth leaf and the seventh leaf, respectively. The photosynthetic ability at the flowering and the seed development stage showed significant differences among soybean cultivars, and the photosynthetic ability at the seed development stage showed higher difference among cultivars than the flowering stage. The variation of the photosynthetic ability at the flowering and the seed development stage also was significant among cultivars. The light saturation point at the flowering stage was about 1500 $\mu$mol $m^{-2}$ $s^{-1}$ PAR, and the seed development stage was about 1000 $\mu$mol $m^{-2}$ $s^{-1}$ PAR. The photosynthesis showed the high negative correlation with the leaf area and the positive correlation with the leaf area ratio. Also, photosynthesis at seed development stage showed positive correlation with grain yields but there was not significant between photosynthesis and yields at flowering stage..

• 한국작물학회지
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• 제26권1호
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• pp.103-109
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• 1981

담배의 엽탈락, 품질 및 수량에 미치는 석회와 붕사의 영향을 알고자 시험한 결과를 요약하면 다음과 같다. 1. 엽탈락 이식후 40～80일에 많이 발생되며 불위엽에서 상위엽으로 진행된다. 2. 석회의 시용은 엽탈락을 조장하나 붕사는 엽탈락을 현저히 감소시켰다. 3. 석회의 시용은 전당, Lignin, 붕소함량을 감소시키며 붕사시용은 붕소와 Lignin 함량을 증가시킨다. 4. 붕사의 1년시용으로 엽탈락의 완전방지는 어려웠다. 5. 석회와 붕사의 시용량은 각각 120kg/10a,1.2kg/10a가 엽탈락방지와 품질, 수량성으로 보아 적정시용량으로 인정되었다.

• 한국농공학회논문집
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• 제46권1호
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• pp.75-86
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• 2004

The objective of the research is to develop agricultural resue technologies of reclaiming the effluents from a municipal wastewater treatment plant and reusing for irrigated rice paddies. The Suwon wastewater treatment plant was selected for wastewater reuse tests. The control was the plots with groundwater irrigation (TR＃1), the treatment (TR＃2) using polluted stream water as it was, and three others using wastewater after treatment. Three levels of wastewater treatments were employed： the effluent from the wastewater treatment plant (TR＃3), sand filtering after treatment plant(TR＃4), and ultra-violet treatment after sand filtering (TR＃5). The randomized block method was applied to wastewater application to paddy rice with five treatments and six replica. The effects of various wastewater treatment levels on water quality, paddy soil, crop growth, yields, and the health hazards were investigated. The primary results indicate that cultivating rice with reclaimed wastewater irrigation did not cause a problem to adverse effects on crop growth and yields. Overall, wastewater could be used as a practical alternative measure for reclaimed wastewater irrigation. However, long-term monitoring is recommended on the effects on soil chemical characteristics and its related health concerns.

• Asian-Australasian Journal of Animal Sciences
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• 제14권7호
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• pp.956-959
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• 2001

Three perennial grasses, Napier (Pennisetum purpureum), Andropogan (Andropogan gayanus) and Para (Brachiria mutica), were grown at different hill heights dividing the hill slope into three regions (top, middle and bottom). The first two grasses gave the highest biomass yields (29.9 and 37.6 tonnes/ha/harvest, respectively) followed by Para (20.5 t/ha). No significant (p>0.05) changes in biomass yields of the grasses were found due to differences in hill heights. The grasses were harvested three times in the first year of cultivation. Maize and cowpea as sole crops or their intercrops were cultivated in the plain land and the intercrop gave the highest biomass yield (46.7 t/ha, p<0.05). The biomass produced was successfully ensiled in the underground pits at the hill tops.

• 한국농공학회지
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• 제39권6호
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• pp.31-40
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• 1997

Potential impacts for unfavourable weather conditions and the assessment of the magnitudes of their adverse effects on crop yields were studied. EPIC model was investigated for its capability on crop yield predictions for rice and soybean. Weather generationmodel was used to generate long-term climatic data. The model was verified with ohserved climate data of Suwon city. Fifty years weather data including abnormal conditions were generated and used for crop yield simulation by EPIC model. Crop yield probability function was derived from simulated crop yield data, which followed normal distribution. Probable crop yield reductions due to abnormal weather conditions were also analyzed.

• 한국작물학회지
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• 제2권
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• pp.30-37
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• 1964

대두품종의 파종기별 수량과 제특성간의 관계, 그리고 파종기별 수량의 품종간의 차이를 알고자 1962년과 1963년의 각 파종기에 대하여 실험한 바 그 결과를 요약하면 다음과 같다. 1. 파종기별 수량과 몇가지 생태적 특성과의 상관관계는 Table 1과 같이 대체로 개화일수와 생육일수는 극만파(7월파종)의 경우를 제외하고 수량과 정의 상관을 보이고 그 정도는 조기파종구에 있어서 더욱 높았다. 그리고 개화기간은 수량과 부의 상관의 경향이 보이고 결실일수는 년차나 파종기에 따라서 그 관계가 명료하지 아니 하였다. 2. 파종기별 수량과 몇가지 형태적 특성과의 상관관계는 Table 2와 같이 대체로 분기수 경직경 1주중량, 1주맥수 그리고 1주입수는 수량과 어느 파종기에 있어서도 정의 상관관계를 보이고 경장과 수량 그리고 100 입중과 수량간에는 년차 파종기에 따라서 그 관계가 명료하지 아니하였다. 따라서 수량에 영향하는 특성은 개화일수, 생육일수의 두 생태적 특성과 함께 분기수, 경직경, 1주중량, 1주맥수 그리고 1주입수의 제형태적 특성이라고 할 수 있겠다. 3. 품종수량순위가 파종기에 따라 변동하는 경향을 보면 Table 3과 같이 대체로 공시품종중 울산, 상두, 장단백자, 익산, 함안, 반청두, 안전대입은 어느 파종기에 있엇도 높은 수량을 나타내고 이들은 성숙군이 IV, V, VI에 해당하는 중, 만생종으로 우리나라 중요재래품종들이며 극조생종이나 극만생품종은 수량은 떨어지나 극조생 또는 조생종중에서도 Black Hawk, 충북백 등은 만파의 우연에, 만생종인 동산006 등은 조파의 경우에 높은 수량을 보이는 품종들이었다. 4. 품종별 수량이 파종기에 따라서 변동하는 경향을 보면 Table 4와 같이 대체로 조생종에 있어서는 파종기 연장에 따라 수량 감소의 정도가 낮고 도리어 조파보다 만파의 경우에 좋은 성적을 나타 내었으나 중생종, 만생종일수록 파종기 연장에 의한 수량 감소의 정도가 높았다. 옥면과 같은 극만생종 품종은 조반의 경우라도 상해 등으로 본실험지의 기후조건 하에서는 경제적 재배가 곤란하다고 믿는다. 따라서 조생종에 있어서는 5월 이후의 만파의 경우에, 중, 만생종에 있어서는 4월보다 도리어 5월 파종의 경우에 좋은 성적을 나타내는 경향이 있으나 품종별 파종 최적기 등의 결정문제는 앞으로 해결되어야 할 한 과제가 될 수 있을 것이라 하겠다.

• 한국토양비료학회지
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• 제47권6호
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• pp.553-557
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• 2014

The steady increase in livestock industry has greatly required the stable production of food and forage crops. As an alternative, rice-forage cropping system has been attempted in several southern areas. The present study was performed to understand whether an application of cattle-manure compost affects soil chemical properties and crop productivity in rice-forage cropping system, rice ${\rightarrow}$ summer oat ${\rightarrow}$ rye, in Jangheong county, south Jeolla province from 2013 to 2014. Treatments was composed of control (no compost), CM1 (compost application before rice transplanting), and CM2 (two-times compost application, before rice transplanting and after rice harvest), and inorganic fertilizers (N, P, and K) were equally dressed in all plots. Yields of rice were not significantly different between treatments, however, oat production was 1.25-fold higher in CM1 and CM2. Nutrient uptake amounts of rye were higher in CM2 than CM1 and control. Total nitrogen in soil was maintained stable level during crop cultivation. And soil organic matter contents in all treatments were increased by crop residue. Available P_2O_5$ and exchangeable K were increased by cattle manure application. Therefore, it suggested that the amount of nutrient by forage crop residue should be considered in rice-forage multiple cultivation.