• Title/Summary/Keyword: crop growth experiment

Search Result 1,205, Processing Time 0.026 seconds

Effect of Soil Acidity and Nitrogen Fertilization on the Growth and Yield of Barley Cultivars (대맥의 내산성 품종육성을 위한 기초연구 I. 토양산도와 질소시용량이 대맥품종의 생육 및 수량에 미치는 영향)

  • Shim, Jai-Wook;Lee, Hong-Suk;Choi, Kyung-Jin
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.33 no.1
    • /
    • pp.12-22
    • /
    • 1988
  • The effects of pH and Aluminum treatment on the seedling growth were examined with 11 cultivar under three levels of pH in nutri-culture.. Growth and yield responses of soil pH and nitrogen fertilization were also studied with five cultivars under 3 levels of soil pH and 3 levels of nitrogen application in the field experiment. The effect of pH on the seedling growth was not significant, but Aluminum treatment significantly decreased the seedling growth in nutri-culture except Dusan #12. Chlorophyll contents of leaves, dry weight of plants, culm length, spike numbers per unit area, grain numbers per spike, grain weight, and yield were decreased as the decrease of soil pH, and thus highly significant correlation between soil pH during barley growth and yield was observed in all cultivars examined. The stable cultivars to different soil pH with high yield was not found although the decreases of yield were different with cultivars. The increase of nitrogen fertilization significantly increased the nitrogen and chlorophyll contents of leaves, and dry weight of plants, while showed a little effects on the culm length, spike number per unit area, grain number per spike, grain weight and yield. The yield was significantly correlated with culm length, dry weight of plants, grain numbers per spike and 1000 grain weight at each pH levels.

  • PDF

Growth and yield responses of rice varieties to various soil water deficit conditions under different soil types

  • Kikuta, Mayumi;Samejima, Hiroaki;Magoti, Rahab;Kimani, John M.;Yamauchi, Akira;Makihara, Daigo
    • Proceedings of the Korean Society of Crop Science Conference
    • /
    • 2017.06a
    • /
    • pp.322-322
    • /
    • 2017
  • To avoid drought stress under rainfed upland conditions, it is important for rice to efficiently utilize water at shallow soil layers supplied by rainfall, and access to water retained in deer soil layers. The root developmental characteristics of rice, which play important role in the adaptability to drought conditions, vary depending on the variety. Moreover, water availability for plant differs depending on the soil types that have different physical properties such as water holding capacity, permeability, capillary force, penetration resistance, etc. In this study, we evaluated growth and yield responses of rice varieties to various soil water deficit conditions under three different soil types. The experiment was conducted in a plastic greenhouse at the Kenya Agricultural and Livestock Research Organization-Mwea from October 2016 to January 2017. Two upland varieties (NERICA 1 and 4) and one lowland variety (Komboka) were grown in handmade PVC pots (15.2 cm diameter and 85.0 cm height) filled with three different types of soil collected from major rice-growing areas of the country, namely black cotton (BC), red clay (RC), and sandy clay (SC). Three watering methods, 1) supplying water only from the soil surface (W1), 2) supplying water only from the bottom of the pots (W2), and 3) supplying water both from the soil surface and the bottom of pots (W3), were imposed from 40 days after sowing to maturity. Soil water content (SWC) at 20, 40, and 60 cm depths was measured regularly. At the harvesting stage, aboveground and root samples were collected to determine total dry weight (TDW), grain yield, and root length at 0-20, 20-40, 40-60, and 60-80 cm soil layers. Irrespective of the watering methods, the greatest root development was obtained in RC, while that in BC was less than other two soils. In BC, the degree of yield reduction under W1 was less than that in RC and SC, which could be attributed to the higher water holding capacity of BC. In RC, the growth and yield reduction observed in all varieties under W1 was attributed to the severe drought stress. On the other hand, under W2, SWC at the shallow soil depth in RC was maintained because of its higher capillary force compared with BC and SC. As the result, growths and yields in RC were not suppressed under W2. In SC, deep root development was not promoted by W2 irrespective of the varieties, which resulted in significant yield losses. Under W1, the rice growth and yield in SC was decreased although shallow root development was enhanced, and the stomatal conductance was maintained higher than RC. It was suspected that W1 caused nutrients leaching in SC because of its higher permeability. Under rainfed conditions, growth and yield of rice can be strongly affected by soil types because dynamics of soil water conditions change according to soil physical properties.

  • PDF

Effects of Plant Growth Regulators on Growth of Rice Seedling for Machine Transplanting (식물생장조절제 처리가 벼기계이앙 어린모 생육에 미치는 영향)

  • 이주열
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.38 no.4
    • /
    • pp.360-365
    • /
    • 1993
  • The infant seedling of rice(8-to 10-day-old) has often suffered from submergence just after transplanting due to the too short seedling height, 5 to 8cm, This experiment was conducted to elucidate the effect of gibberellic acid($GA_3 : 25% soluble liquid) with the application methods of foliar spray and seed-soaking on the elongation of seedling height of infant rice seedling in machine transplanting, We used a japonica rice variety, Hwaseongbyeo, and the seeding rate was 200g per seed tray(30$\times60$\times3cm). Generally,$GA_3 and Metalaxyl increased the elongation of seedling height of infant seedling while Tetracycle decreased the seedling height, To increase the seedling height of infant seedling, the foliar spary application of $GA_3 was better than seed-soaking treatment. The optimum concentration of $GA_3 for the foliar spray was about l0ppm and the optimum application time of $GA_3 was 3 to 4 days after sowing.

  • PDF

Effects of Rice Straw Application on Barley Growth and Grain Yield in Paddy Field (답리작 보리 재배시 볏짚 시용 효과)

  • 임시규;김정태;김병주;홍순표;서득용;김완석
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.42 no.1
    • /
    • pp.49-55
    • /
    • 1997
  • For the labor-saving cultivation of barley in rice-barley double cropping system in paddy field, a series of expriments on the effect of rice straw application were carried out at the National Yeongnam Agricultural Experiment Station from 1992 to 1993. The affection of phenol compounds released from fresh rice straw could be lessened when seeded under rice straw in the soil and that made emergence rate increase by 11%, compared with that on application on the rice straw. Although utilization of rice straw as an organic material caused the poor growth of barley in early stage, it could be enhanced the culm breaking strength. On this reason, affected by rice straw, grain yield was increased from 8% in common barley and up to 20% in malting barley. The more nitrogen, CaO$_2$2 and SiO$_2$ applied, the more decomposition of rice straw accelerated from 2% to 6.9%. On the application of rice straw as an organic material in malting barely cultivation, the content of crude protein was decreased while 1,000-grain-weight and grain assortment was increased.

  • PDF

Competition Responses between Two Different Growth Type Varieties of Barley (생육형이 다른 대맥 품종간의 경합에 관한 연구)

  • Min-Shin Cho;Deok-Hyeong Han;Sun-Mok Keun;J. D. Lee;J. C. Kang
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.7 no.1
    • /
    • pp.97-101
    • /
    • 1969
  • The experiment about the mixed sowing of two different growth type varieties of barley-Buheung and Suwon#18-has been conducted to determine the competition effect between two varieties, and its results are as follows: 1. Buheung-long stem variety-showed higher survived ratio than Suwon#18-short stem variety- and that tendency was significant under the high fertilized condition. 2. When tow varieties-Buheung and Suwon#18-were sowed together, the culm length of Buheung was shorter than the single planted Buheung and that of Suwon#18 was onger than the single planted Suwon#18, however, the panicle length showed the opposite tendency to the culm length variation. 3. The number of panicles and the number of grains did not show any differences among the treatments. 4. In case of the single sowing, Suwon#18 showed higher grain yield under the common fertilized condition but Buheung showed significantly increased grain yield under the heavy fertilized condition, however, in case of the mixed towing of two varieties, the grain yield was significantly increased in heavy fertilized plots than standard fertilization. 5. The competition power was significantly superior in Buheung to Suwon#18 and this tendency was rather definite according to the fertilizer application.

  • PDF

Effect of Low-land Rice Seedling Preservation on the rice Yield and Growth (저묘방법이 수도의 생육 및 수량에 미치는 영향)

  • Min-Shin Cho;Deok-Hyeong Han;Sun-Mok Keun;Jae-Chul Kang;Jae-Seong Jo
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.7 no.1
    • /
    • pp.93-96
    • /
    • 1969
  • 1. This experiment has been conducted to determine the most desirable method of the low-land rice seedling preservation for long defered transplanting and its results obtained are as follows: 1. On a viewpoint of the management, any method of seedling preservation was not effective when the seedling was transplanted after 20th, July. 2. Vegetative growth after transplanting was shown the most desirable at the plot of the seedling from direct-sowing dry paddy rice culture and next at the plot of the seedlings preserved on the vinyl seed bed. On the other hand, the leaf-cutting or the thinning out of seedling was not effective for the prevention of the seedling decrepitude. 3. On the case of transplanting on 20th July, the seedling from the direct sowing on dry paddy rice culture showed the best yield(378kg/10a) and the seedling preserved on the vinyl seed-bed showed the next (280kg/10a), however, on the case of transplanting on 30th July, the seedling from the direct sowing on dry paddy rice culture showed the best yield(222kg10a), but the yield of other preservation treatment was shown below 90kg/10a.

  • PDF

Effects of Shading material of Rain Shelter on Growth and Quality in Panax Ginseng C. A. Meyer (비누수 해가림 재배가 인삼의 생육 및 품질에 미치는 영향)

  • Lee, Chung-Yeol
    • Korean Journal of Medicinal Crop Science
    • /
    • v.15 no.4
    • /
    • pp.291-295
    • /
    • 2007
  • This study was conducted to investigate the optimum shading material of rain shelter in Panax ginseng C.A. Meyer. Results obtained from our experiment can be summarized as follows. From photosynthetically active radiation (PAR) as shade materials on sunny day, temperature under rain shelter was low in comparison with that under polyethylene net. It was ranged from 3 to $5^{\circ}C$ Survival rate of 3,4, and 5 year-old ginsengs under shade materials of rain shelter was lower than that under polyethylene net. Root fresh weight in ginseng grown under rain shelter was increased into about 5.0g in 3 year-old, 10g in 4 year-old and 8g in 5 year-old ginsengs. From investigating root grade of 3, 4, and 5 year-old ginsengs, we confirmed that rain shelter was more effective than the other as shading materials. Root size of 3, 4, 5 year-old ginsengs grown under rain shelter is distributed in bigger size than that grown under polyethylene net. Also, in the case of saponin contents, the ginseng grown under the shade material of rain shelter was higher than that under polyethylene net.

Effects of Nursery Condition on the Establishment and the Growth of Sesame Seedling (참깨묘 양성조건이 활착 및 생육에 미치는 영향)

  • Jung-Il Lee
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.28 no.3
    • /
    • pp.386-389
    • /
    • 1983
  • An experiment was conducted to establish the appropriate tranaplanting method of sesame seedlings. Covering of polyethylene film on nursery bed resulted in more adventitious roots and better growth after transplanting. Nursery soil showed the best results when it was mixed with the equal amounts of soil, sand and compost. The most healthy seedlings were raised by spot seeding of 5${\times}$5 cm distance and 4 cm bed-depth. Compared to direct seeding on June 15, sesame seeded on June 10 followed by transplanting on June 30 flowered 4 days earlier and produced more capsules per plant and 18% more seed yields.

  • PDF

Effect of N-fertilization on Rice Growth and Quality of Milled Rice (소비재배가 벼 생육 및 미질에 미치는 영향)

  • Kim, Se-Jong;Won, Jong-Gun;Ahn, Duok-Jong;Park, So-Deuk;Choi, Kyeong-Bae
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.51 no.spc1
    • /
    • pp.67-72
    • /
    • 2006
  • This experiment was carried out to identify rice varieties suitable for growing under low N-fertilization levels. Eighteen rice varieties were grown at 5.5 kg and 11 kg/10a nitrogen levels in 2004-2005 in Taegu, Korea. Several varieties like Ilmibyeo, Nampyeongbyeo, Sindongjinbyeo, Dongjin 1 and Donganbyeo yielded more than 470 kg/10a. Low N-fertilization level (5.5 kg/10a) decreased yields of Junambyeo and Donganbyeo by more than 10%. However, the decrease in yield was not significant in Surabyeo and Hwayeongbyeo compared with the 11 kg/10a N-fertilizer treatment. Improved grain quality, chemical properties and palatability was noted in some rice varieties. In terms of rice yield and grain quality, Donganbyeo, Ilmibyeo, Ilpumbyeo, Dongjin 1, Saechoocheongbyeo and Saegyehwabyeo were selected as premising rice varieties for growing under low N-fertilization levels.

Changes of Diterpenoids Levels under Different Environmental Condition Tobacco Leaves (담배의 생육단계 및 환경조건에 따른 Diterpenoids 함량 변화)

  • 금완수;정윤화;최상주;조명조
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.41 no.6
    • /
    • pp.692-697
    • /
    • 1996
  • This experiment was conducted to determine the influences of growth stage, stalk position and growth environment on duvatrienediols(DVT-diols) and cis-abienol production in Nicotiana tabacum L. The leaves of plants at transplanting stage contained very small amount of duvatrienediols and cis-abienol. Comparing leaves on different stalk position at flowering stage, upper and middle leaves contained more DVT-diols and cis-abienol than lower leaves. Plants grown under controlled environmental room at 3$0^{\circ}C$ contained more DVT-diols and cis-abienols than room at 18$^{\circ}C$, $25^{\circ}C$ and glass room. Tobacco plant grown under field condition produced lower levels of duvatrienediols and cis-abienol contents than glass room-grown plants. The amounts of duvatrienediols and cis-abienol of tobacco leaves significantly decreased after rain under field conditions.

  • PDF