• Agrochemical news magazine
• /
• v.22 no.5 s.168
• /
• pp.5-8
• /
• 2001

• 농업기술회보
• /
• v.45 no.3
• /
• pp.36-37
• /
• 2008

무논골점파 재배기술은 초기생육이 우수하고, 잡초성 벼 발생을 방지할 수 있으며, 특히 기계이앙과 비교하여 수량과 품질의 차이가 없는 새로운 직파재배기술이다.

• Korean Journal of Weed Science
• /
• v.15 no.4
• /
• pp.278-288
• /
• 1995

Weed species occurred in dry- and water-seeded rice were 14 (2 grasses, 8 broadleaves, and 4 sedges) and 12 species (1 grasses, 7 broadleaves, and 4 sedges), respectively. Dominant weed species in dry-seeded rice were Lindernia procumbens, Cyperus difformis, Cardamine flexuosa, and Cyperus serotinus in discending order. The species in water-seeded rice were Cyperus difformis, Scirpus juncoides, and Lindernia procumbens. The number of weed species emerged in direct-seeded rice was determined at about 45 days after seeding, and dry weights of weeds were increased up to 75~90 days after seeding. Timing for great increase of plant height varied depending upon weed species. Regardless of weed number emerged, the most dominant weeds until late stage of growth were Cyperus difformis, Bidens frondosa, Digitaria ciliaris and Echinochloa crus-galli in dry- seeded rice, and Cyperus difformis, Echinochloa eras-galli and Scirpus juncoides in water-seeded rice.

• Korean Journal of Medicinal Crop Science
• /
• v.9 no.4
• /
• pp.284-289
• /
• 2001

This study was carried out to know the effect of mulching on growth and yield of Peucedanum japonicum. Time from sowing to germination was 8day at raising seedling(RS) and 40day at direct sowing(DS). The order of goodness in top part growth as follows : RS+white vinyl mulching (WVM), RS+black vinyl mulching (BVM), RS+no mulching(NM) and DS+NM. Tap root length at RS + NM was significantly shorter than those at the others. Tap root at the others was about same length. Tap root diameter was significantly larger at vinyl mulching than at no mulching and the thinnest at DS+NM. The number of supporting root at RS was more than DS as much as $4.7{\sim}7.1$. Rate of dried root weight to fresh weight was highest(30.5%) at DS+ NM and low at vinyl mulching. Dried root yield per 10a was 542kg at RS+WVM, 506kg at RS+BVM, 419kg at RS+NM and 357kg at DS. These results suggested that raising seedling and white vinyl mulching was good for culture of Peucedanum japonicum.

• Korean Journal of Environmental Agriculture
• /
• v.18 no.3
• /
• pp.229-235
• /
• 1999

To identify the differences on plant growth and yield of two rice cultivars among direct water-seeding methods broadcasting on flooded paddy surface(BF), drilling on flooded paddy surface(DF), and puddled-soil drill seeding(PD) under markedly different weather condition between 1995 and 1996. The mean air temperature for duration from May to June, early growth stage of rice in 1995 was lower $1{\sim}3^{\circ}C$ than that in normal or 1996. In 1995 the respiratory consumption index during panicle formation stage and early ripening stage was higher than those of in 1996 or normal year. Number of seedling stand among the methods of direct seeding rice appeared slightly higher in order of BF>DF>PD. Properly in Nonganbyeo, the number of seedling stand was much low in 1995 compared with in 1996. The leaf area index and shoot dry weight at early growth stage of rice plant and culm length at mature in 1995 were larger in direct water seeding rice than those of machanical transplanting rice, but in 1996. Faster ripening speed and shorter ripening period of rice crop appeared in 1996 compared to in 1995. It was due to higher growing degree-days, sunshine hours and solar radiation during rice growing season in 1996. Dongjinbyeo rice showed higher yield than Nonganbyeo which had lower ripened grains especially in 1995.

• Applied Biological Chemistry
• /
• v.11
• /
• pp.185-188
• /
• 1969

This experiment was carried out to investigate on the growth, yield behavior of phosphorus at different stage of growth under the different cultivating conditions in rice plants. The results obtained were as follows; 1) The phosphorous contents was increased in the direct-sowing plots of the rooting time and the early stage of tillering, while in the middle and the later stage of growth, the transplanting plots was increased. 2) In the moisture contents, the direct-sowing plots was more increased than the transplanting plot in the rooting time and the early stage of tillering, while in the later stage of growth, the transplanting plots was increased. 3) The plant height and the weight of dry matter were also increased in the direct-sowing plots of the early stage of tillering, on the other hand, after that the transplanting plots was increased. 4) In the yield of grain, the transplanting plots was increased about 15% compared with the direct-sowing plots.

• Korean Journal of Weed Science
• /
• v.13 no.1
• /
• pp.26-35
• /
• 1993

Differences in weed occurrence was investigated among five types of rice (Oryza sativa L.) cultivation. The five types employed were three transplanting cultivations such as conventional hand transplanting, machine transplanting with 30-day-old seedling, and machine transplanting with 10-day-old seedling and two direct-seedings such as flood direct-seeded rice by pregerminated seed and dry direct-seeded rice by dry seed. Weed specie, occurred varied from 7 to 20, depending on the different cultivation types. Weeds were more diverse in transplanting with l0-day-old seedling than in other transplanting cultivations and in direct-seeding than in transplanting practice. Dominant weed species also varied with cultivation types. In transplanting cultivations Scirpus juncoides Roxb., Echinochloa crus-galli (L.) P. Beauv., and Eleocharis kuroguwai Ohwi were dominant, whereas occurrence of annual weeds such as Cyperus difformis L. and Monochoria vaginalis Presl. aside from the three weed species increased in direct-seeded cultivations.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2005.05b
• /
• pp.1445-1449
• /
• 2005

벼재배에 있어서 기계이앙은 1970년 이후 급속히 이루어졌으며 90년대에 이르러서는 노동력과 농업용수 절감을 위하여 직파재배의 보급이 이루어지고 있어 영농방식 변화가 농업용수의 이용에 큰 영향을 미치고 있다. 따라서 실제 영농상황과 농업용수 수요량 산정방법간의 차이를 조사 분석하고 농업용수 수요량 산정을 위한 적절한 방안을 모색하는 것이 필요하다. 본 연구에서는 기존의 문헌 및 실제 현장에서의 영농상황을 조사하고 수원공으로부터 관개구역으로 공급하는 용수공급량을 측정하였으며 3개지구를 대상으로 필요수량을 산정하여 비교하였다. 이앙재배에 있어서 기계화의 보급과 비닐하우스 등의 설치에 의하여 이앙기간과 이앙시기에 많은 차이를 보이고 있는데 과거에 비하여 이앙시기는 앞당겨지고 이앙기간은 짧아졌는데 이러한 변화는 지역에 따라 다른 특성을 보이고 있다. 또한, 이러한 변화는 과거와 비교하여 농업용수 수요량에 변화를 가져왔으며 변화는 대부분 4월, 5월에 집중되어 나타났다. 직파재배는 이앙재배에 비하여 용수를 많이 필요로 하는데 본답기 이전에 용수수요량의 차이가 많은 것으로 나타나고 있다. 이러한 직파재배의 면적은 1997년까지 계속적으로 증가하다 잡초성 벼의 번성, 연작의 피해 등으로 인하여 재배면적이 줄어든 상태이다.

• Korean journal of applied entomology
• /
• v.36 no.2
• /
• pp.141-144
• /
• 1997

Studies were conducted to investigate the incidense of insect pests in transplanted and direct seeded paddy fields in southern region of Korea. Population dencities of the rice green leafhopper (RGLH: Nephotettix cincticeps Uhler) and rice leaffolder (RLF: Cnaphalocroch medinalh Guenee) were higher in machine transplanted than in direct seeded, but the brown planthopper (BPH: Nilaparvata lugens Stal) and smaller brown planthopper (SBPH: Laodelphax striatellus Fallen) were abundant in direct seeded. However, no significant difference was found between machine transplanted and direct seeded fields in the incidense of rice stem borer (RSB: Chilo suppressalis Walker), whiteback planthopper (WBPH: Sogatella furcifera Horvath), and rice stem magot (RSM: C'hlorops oryzae Matsumura). Occurrence of rice key pests were affected more by transplanting time than other cultural practices. Later transplanting induced higher populations of BPH, WBPH, SBPH, RGLH. However, RSB and RLF caused higher damage in earlier transplanted paddy field.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.40 no.6
• /
• pp.747-756
• /
• 1995

To find out the optimum application method of slow-releasing fertilizer(SRF) and conventional fertilizer(CF) with different fertilization rate under two culture methods[l0-day old seedling machine transplanting(MT) and direct-sowing on dry paddy(DS)] in the south-western region(clay loam soil) of Korea, used were Chosun slow-releasing fertilizer(silicate latex coated fertilizer: N-P$_2$O$_{5}$-K$_2$O =18-12-13) and conventional fertilizer. Plant height and number of tillers with different two culture methods were higher at MT than DS in early growth. The ratio of dry weight in heading stage was higher at CF than SRF in MT than DS and especially, SRF 80% + CF 20% than SRF 100% or CF 100%. Leaf area index (LAI) in heading stage was higher at CF in MT but higher at SRF in DS than their counterparts. Chlorophyll content was higher at SRF than in CF expect for heading stage(HS), especially in DS. It was highest at HS in CF without its difference during maximum tillering stage(MTS) and panicle formation stage(PFS), while highest at PFS in SRF with tendency of gradual increase and decrease before and after PFS, respectively. Heading was delayed 2~3 days at SRF in two cultrue methods and 4~5 days at SRF in DS in comparison with CF in MT with delay of 2 days at DS compared with MT. Culm length was longer at CF in MT and at SRF in DS than their counterparts. Panicle number per m was more at SRF and in DS. Filled grain ratio was higher at CF and in MT. Yield was obtained 101 and 100% at 100% and 80% level of SRF in DS respectively, and 96% at 80% level of CF in MT, compared with conventional application method (516kg /l0a), and increased 2~4% at DS and 0~3% at MT in SRF. Yield was high in order of 100%(SRF) =80%(SRF) + 20%(CF) > 100%(SRF) + 20%(CF) > 80%(SRF) at MT and 80%(SRF) + 20%(CF) =100%(SRF) > 80%(SRF) =100%(SRF) + 20%(CF) at DS.