• Title/Summary/Keyword: Sowing field

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Weed Occurrence as Influenced by Living Mulch, Soil Incorporation and Cutting Treatment of Rye in Organic Soybean Field (호밀 리빙멀치, 토양환원, 예취처리가 유기농 콩밭 잡초 발생에 미치는 영향)

  • Lee, Byung-Mo;Lee, Ji-Hyun;Oh, Young-Ju;Lee, Sang-Bum;Kang, Chung-Kil;Jee, Hyeong-Jin;Lee, Jong-Hyung
    • Korean Journal of Weed Science
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    • v.30 no.2
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    • pp.164-170
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    • 2010
  • In organic agriculture, cover crops are used for weed control. Cover crops inhibited weed germination or growth by allelopathy or shading effects. In this study, we used rye as cover crop to control weed in organic soybean field. The main treatment was rye using method such as living mulch, incorporating and mowing. Sub-treatment was rye planting density and soybean planting density. One month after soybean sowing, weed emergency and growth had been highly suppressed by rye in all treatments. Living mulch treatment was the best effective way to control the weed about 92%, and mowing treatment was the second about 75% compare to control. The weed control efficiency between rye planting densities was similar during one month. Soybean planting density treatment was same result as rye planting density. As a result of this experiment, we recommend rye as living mulch in one row planting.

Effects of Ridging Times on Agronomic Characteristics, Yield and Feed Value of Corn Hybrid for Silage in Paddy Field Cultivation (논 토양에서 사일리지용 옥수수 재배시 배토시기가 생육특성 및 영양성분에 미치는 영향)

  • Lee, Sang-Moo
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.32 no.3
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    • pp.265-274
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    • 2012
  • This study was carried out to investigate the growth characteristics, yield and chemical compositions of corn hybrids for silage according to ridging times in the paddy field cultivation. The experimental design was arranged in a randomized block design with five treatments and three replication. The ridging times of five treatments were untreated (C), 7 leaves (T1: 31 days), 8 leaves (T2: 37 days), 9 leaves (T3: 42 days) and 10 leaves stage (T4: 48 days after sowing) of silage corn. The ridging treatments (T1, T2, T3, T4) were higher (p<0.01) dry matter yield and TDN yield than the unridging treatment (C). However, there were no significant differences among T1, T2, T3 and T4 treatments. The Crude protein content of unridging treatment was decreased (p<0.01), while NDF content was increased (p<0.01) compared to ridging treatments. The contents of mineral and amino acid in ridging treatments were higher than unridging treatment (p<0.05, p<0.01). In particular, mineral and amino acid contents were the highest in T4 and T1, respectively (p<0.01). Based on the above results, ridging work is to be increased the yield quantity and nutritional value of silage corn. And the best result was obtained in T4 treatment of ridging treatments.

Herbicidal Effects on the Differential Rice Cultivation Condition and Damage of No-target Plants of Macro Granule Herbicide for Remote-controlled Aerial Application (무인헬기용 Macro granule 제초제의 벼 작형별 살초효과 및 주변작물에 미치는 영향)

  • Yoon, Cheol-Su;Bae, Chang-Hyu;Lee, Sheong-Chun;Kim, Kyung-Hyun;Lee, Kye-Hwan;Cho, Tae-Kyoung;Hwang, In-Cheon
    • Korean Journal of Weed Science
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    • v.31 no.4
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    • pp.375-383
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    • 2011
  • This experiment was carried out to confirm characteristics of macro granule (GG) for herbicidal efficacy by using remote-controlled aerial application (RCAA) to control annual and perennial weeds in rice paddy field, and phytotoxicity to rice and non target plants of formulation types. Herbicidal efficacy of GG applied by using RCAA was 93.6~96.6% in flooded direct sowing cultivation. There was no difference in phytotoxicity between the hand and the power applicator methods in terms of height, number of tiller and yield component. Herbicidal efficacy of GG applied by using RCAA was 92.7~97.3% in machine transplanting rice field. There was no difference in phytotoxicity between the hand and RCAA methods in terms of height, number of tiller and yield component. When suspension concentrate (SC) and GG were applied directly on Chinese cabbage, lettuce, cucumber, pepper, soybean and wild sesame, several symptoms of injury such as, the inhibition of growth, yellowish, leaf fall and withering was observed.

Effect of Irrigation Methods on the Growth and Yield of Rice in Desert Climates (사막토양 환경에서 벼 재배시 관개방법에 따른 생육 및 수량 특성)

  • Jung, Ki-Youl;Lee, Sang-Hun;Jeong, Jae-Hyeok;Chun, Hyen-Chung;Chea, Se-Eun;Kim, Sang-Yoon;Jeon, Seung-Ho
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.67 no.3
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    • pp.147-154
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    • 2022
  • This study was conducted by directly sowing Asemi in late April at 30 × 10 cm intervals to determine the optimal irrigation method and irrigation amount to maximize the use of limited agricultural water and to increase the yield when growing rice in a desert climate. Conventional irrigation (Conv.), surface drip irrigation (Sur), subsurface drip irrigation (Sub.), and sprinkler irrigation (Spr.) methods were used. The following amounts of irrigation were tested based on field capacity (0.33 bar): 80% (V/V, FC80), 100% (FC100), and 120% (FC120), and data for 2 years were averaged. The total amount of irrigation by irrigation method was the lowest, at 627 ton/10 a, for Sub. irrigation with the FC80 treatment, which was 60.4% less than the amount of irrigation with the FC120 treatment (1,584 ton/10a). Sub. irrigation with the FC120 treatment gave the greatest amount of rice, at 665 kg/10 a, and this condition obtained a yield of 88.1% (754 kg/10 a) of the yield obtained with the conventional treatment. Therefore, when planting rice in a desert climate, subsurface drip irrigation at 120% of field capacity is considered advantageous to increase water use efficiency and crop yield.

Effects of Seed Sterilization on Seedling Blight in Sesame (Sesamum indicum L.) (참깨 입고병에 대한 종자 소독제의 효과)

  • Lee, J.I.;Kang, C.W.;Lee, S.T.
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.27 no.1
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    • pp.78-83
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    • 1982
  • Seedling blight of sesame (Sesamum indicum L.) is one of the most serious diseases in Korea. This study was performed to control seedling blight in the field where sesame has been cultured for 4 years of Industrial Crop Division at the Crop Experiment Station. The pathogenic fungi of seedling blight which is known Fusarium oxysporum f. vasinfectium and Rhizoctonia solani was inoculated to the wheat media and it was spreaded on the experimental field in the concentration of 109 of wheat media mixed with 10g of fine soil. Seed sterilization was the most effective method for seedling blight control for two year experiment. Seed sterilant Benlate-T was highly effective for con trolling seedling blight with infection rate of 4% and yield of 40.7kg per 10a comparing to the control with infection rate of 96% and grain yield of 6.4kg per l0a, the other chemicals, Busan 30, Vitathiram, Captan showed good effect to control seedling blight, but less effect to the Benlate-T. The spraying treatments on leaf surface 25 days after sowing were not effective to seedling blight.

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Effects of Harvesting Time on Yield and Forage Value of a Winter Wheat Cultivar 'Cheongwoo' (청우밀의 수확시기가 생산성 및 조사료 가치에 미치는 영향)

  • Seo Young Oh;Jong Ho Seo;Jisu Choi;Tae Hee Kim;Seong Hwan Oh
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.25 no.3
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    • pp.172-181
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    • 2023
  • In order to raise the self-sufficiency rate of domestic forage and obtain informations necessary for production of high-quality winter forage, forage yield and feeding value were analyzed in the above-ground parts of a winter wheat 'Cheongwoo' harvested at five different growth stages, and the appropriate harvest time was determined. The yield increased until 30 days after heading, and then decreased afterwards. The proportion of spike in the above-ground part was less than 40% until 30 days after heading, but increased to more than 60% afterward. At 30 days after heading, the protein content and relative feed value (RFV) also reached peaks, while acid detergent fiber (ADF) and neutral detergent fiber (NDF) were low. The mineral nutrient contents are within the standard range required for feeding ruminant livestock or do not exceed the maximum allowable level. Therefore, the best time to harvest above-ground parts of a winter wheat 'Cheongwoo' for use as a forage for feeding ruminant livestock is around 30 days after heading, when considering forage yield and feed values. As a result it would match well in time with the transplantation of rice seedlings or the sowing of rice-alternative field crops in the double cropping system.

A Ten-Year Result of Artificial Inoculation of Pines with Ectomycorrhizal Fungi, Pisolithus tinctorius and Thelephora terrestris (묘포장(苗圃場)에서 균근균(菌根菌)으로 인공접종(人工接種)한 5개(個) 소나무류(類)의 접종(接種) 10년후(年後) 조림지(造林地)에서의 생장효과(生長效果))

  • Lee, Kyung Joon
    • Journal of Korean Society of Forest Science
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    • v.81 no.2
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    • pp.156-163
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    • 1992
  • Pinus koraiensis (Pk), P. rigida (Pr) and P. rigida ${\times}$ P. taeda (Pr. t) seedlings in a bare-rooted nursery were artificially inoculated with Pisolithus tinctorius (Pt) and Thelephora terrestris (Tt) to test long term effects of ectomycorrhizal inoculation on host growth. Mycelial inocula of Pt and Tt were mass-cultured in vermiculite-peatmoss mixture and introduced into fumigated nursery soil before seed sowing. Bare-rooted, inoculated seedlings at one to four years of age were outplanted to the field with $P_2O_5$ content of 25 ppm in soil. At the time of outplanting, Pk seedlings(4 years old), Pr seedlings(2 years old), and Pr.t seedlings(1 year old) all infected by Pt were significantly taller by 28%. 26%, and 77%, respectively, than controlled seedlings infected by natural population of mycorrhizal fungi in the non-fumigated plot. Ten years after inoculation or six to nine years after outplanting, Pk seedlings inoculated with Pt were significantly taller by 9% Pr.t seedlings significantly taller by 18%, and Pr slightly Caller by 2%(not significant) than controlled seedlings, suggesting that the stimulatory effect of Pt on host growth gradually declined or became minimal after outplanting. Tt failed to stimulate host growth either in the nursery or in the field, and the survival rate of outplanted seedlings was not different among fungal treatments. Considerable loss of the infected root system during lifting the seedlings for outplanting would be the primary cause of the reduced effect of Pt in the field. Pt infected more than 90% of the fine roots in the fumigated nursery during the first growing season, but Pt assumed to fail to compete successfully with natural population of ectomycorrhizal fungi in the field. It is necessary to select other mycorrhizal fungi which adapt well in both nursery and field.

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Growth Characteristics and Productivity of Winter Crops After the Continuous Whole Crop Rice Cultivation in Paddy Field in Middle Region (중부지역 답리작에서 동계 사료작물의 조기파종 효과)

  • Lim, Young-Chul;Yoon, Sei-Hyung;Kim, Won-Ho;Kim, Jong-Geun;Choi, Gi-Jun;Kim, Meing-Jooung;Jung, Min-Woong;Seo, Sung;Yook, Wan-Bang
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.27 no.3
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    • pp.183-188
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    • 2007
  • This study was conducted to determine the effects of seeding date on agronomic characteristics, productivity and feed value of Italian ryegrass, barley and rye during cropping after rice in Suwon, middle region of Korea, during 2004 and 2005. In general, early seeding (26 September) showed longer plant length and branch numbers per square meter than late sowing (11 October). Italian ryegrass had more early seeding effect than barley and rye. The yield of each plant was affected by sowing date in all experiments: the earlier seeding had higher yields than late seeding. In case of Italian ryegrass and barley as late-heading varieties showed more early seeding effect than rye. On the other hand, feed value tended to respond differently to yields. The feed value of each plant were based on liquid swine manure (12%) > composted cattle manure (7%) > composted swine manure (2%). The present results highlight the earlier planting obtained higher yield compared to those planted conventionally.

Study of the Use of Winter Forage Crops, Early Maturing Rice and Summer Oats in Triple Cropping Systems at Paddy Field in Southern Region (남부지역 논에서 사료맥류, 조생종 벼 및 하파귀리를 활용한 삼모작 작부체계 연구)

  • Song, Tae-Hwa;Park, Tae-Il;Park, Hyong-Ho;Cho, Sang-Kyun;Oh, Young-Jin;Jang, Yun-Woo;Rho, Jea-Hwan;Park, Kwang-Geun;Kang, Hyeon-Jung
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.34 no.4
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    • pp.227-233
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    • 2014
  • This experiment was undertaken to develop triple cropping systems for winter cereal crops for forage, early maturing rice and oats, and to select a winter forage crop in order to determine rice transplanting time at paddy fields in the southern region. Also, the productivity and feed value of the resulting forage crops were examined. When winter cereal crops used for forages are first harvested at the early maturing rice transplanting period, and again harvested during the winter forage crop harvesting period, the fresh yield and dry matter yield of rye were 32.0, 42.3 ton/ha and 5.8, 16.5 ton/ha, respectively, demonstrating higher yields than other winter crops. The early maturing rice, 'Jopyeong', transplanted on June 4 had a lower percentage of ripened grain compared to those transplanted on May 6, and milled rice yield transplanted on June 4 was also decreased by 22%. Thus, the results showed that early transplanting was profitable. Regarding the oats grown during the fall cropping season, the heading date for the oats sown first was on October 10, but the heading was not observed in those sown later. Dry matter yield and TDN yield of the second sowing was less than 50% compared to the first. Consequently, rye may be the most suitable winter forage crop for triple cropping systems. Early transplanting of 'Jopyeong' after rye harvesting before April 30 in addition to timely sowing of oats in the fall season would be profitable for rice and forage production using triple cropping systems in the southern region.

Effect of Inoculation with Bradyrhizobium sp. and Lime Types on Peanut Plant at Newly Reclaimed Area -1. Content of Nutrients in Plant and Yield (야산개간지(野山開墾地)에서 근류균(根瘤菌) 접종(接種) 및 석회(石灰) 비종별(肥種別) 시용(施用)이 땅콩 생육(生育)에 미치는 영향 -1. 식물체중(植物體中) 양분함량(養分含量) 및 수량(收量))

  • Lee, Deog-Bae;Im, Geon-Jae;Kwon, Tae-Oh;Lee, Sang-Bok;So, Jae-Don
    • Korean Journal of Soil Science and Fertilizer
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    • v.24 no.3
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    • pp.210-218
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    • 1991
  • This study was carried out to investigate the influence of inoculation with Bradyrhizobia and lime types on the nutrient content and yield of peanut. Inoculation size of Bradyrhizobium sp. HCR-46 was $8.2{\times}10^7$ cells per seed. Slaked lime, magnesium lime, and calcium carbonate were applied in an amount required for neutralization of soil. 150kg of calcium sulfate was fertilized to 10a of the experimental field. Sowing space was $40{\times}25cm$ under vinyl mulching. Leaves and stems for assay were sampled at 100 day after sowing. The obrained results are as follows. 1. Number and dry weight of nodule as well as dry weight of aerial part of peanut plant increased by inoculation with B. sp. and were the highest in calcium carbonate application. 2. Inoculated with B. sp., the contents of T-N, $K_2O$, MgO, allantoin, ammonia, free amino acid and chlorophyll increased, but that of nitrate decreased. 3. The contents of T-N, free amino acid, and chlorophyll were higher in the treatment of calcium carbonate, those of $K_2O$, MgO, allantoin, ammonia were higher in magnesium lime application, and those of CaO and nitrate were higher in slaked lime fertilization than any other lime types. 4. Contents of total sugar and starch in stem at 100 days were higher in the treatment of uninoculation than inoculation with B. sp., and those were highest in the calcium sulfate application than the other lime types. 5. Inoculated with B. sp. length of main stem and number of pods increased significantiy. Yield of seed was higher in inoculation with B. sp. than in uninoculation by 64%, and in the order of carbonate, magnesium lime, slaked lime, in calcium sulfate and non-application was the contribution of soil treatments to yield increases.

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