Dissertation > Excellent graduate degree dissertation topics show

Studies on Spike Differentiation and Regulation of Seed Production in Tall Fescue and Kentucky Bluegrass

Author: LiuLu
Tutor: WangZhaoLong
School: Shanghai Jiaotong University
Course: Olericulture
Keywords: Tall fescue Kentucky bluegrass Panicle initiation Seed yield Nitrogen fertilizer Density
CLC: S688.4
Type: Master's thesis
Year: 2009
Downloads: 82
Quote: 0
Read: Download Dissertation

Abstract


The two most widely used cool-season turfgrass tall fescue and Kentucky bluegrass, its green long period, the landscape of high quality, high fescue and Kentucky bluegrass varieties are almost always bred in the United States, it is difficult to adapt to China's Yangtze River in summer hot and humid climatic conditions, few new varieties bred in China due to seed production obstacles in large scale applications, Therefore, tall fescue and meadow bluegrass as test material, the following five areas of study: one, tall fescue and Kentucky bluegrass spike differentiation and flowering habits of observation, two different nitrogen levels affect the formation of tall fescue and Kentucky bluegrass seed yield three different density levels Festuca Mao and Kentucky bluegrass seed yield formation of four different tall fescue and Kentucky bluegrass varieties (lines) adaptive research in the Shanghai region, five cool-season lawns summering management. The main findings are as follows: 1. Basically the same tall fescue and Kentucky bluegrass spike differentiation process can be divided into five periods: the bud primordium period, primary branch primordium, two, three branch primordium, spikelet and floret primordium, pistil and stamen formation. Involucre primordia differentiation focused on reviving stage, the primary branch primordia differentiation focused on reviving stage and tillering stage, two or three times branch primordia differentiation focused on the tillering, spikelet and floret primordium is mainly concentrated in the jointing stage, while pistil and stamen formation is mainly concentrated in the booting stage. Flowering floret differentiation sequence with the same order. Total cobs primary branches flowering sequence is from top to bottom; each a branch or secondary branch flowering sequence is the top spikelet first flowering, then start from the bottom up from the base of the branch, florets in each spikelet flowering order is bottom up from the top of the second small spike up to open the finished flower; 2. Nitrogen application can significantly improve tall fescue seed per unit area of ??panicles, grains per panicle and grain weight. Moderate nitrogen levels the N2 (100kg/hm ~ 2N) treatment of tall fescue panicles highest in two experimental plots of 805 / m ~ 2 and 600 / m to 2, significantly higher than that of other processing and control . High nitrogen levels N3 (150kg/hm ~ 2N) Although the treatment can significantly increase the total number of tillers of tall fescue, but excessive nitrogen will result in tall fescue produce more ineffective tillers, seed panicles of final formation was significantly lower than moderate nitrogen levels (N2). Grains per panicle N treatments were significantly higher than the control, but the difference was not significant between the three N treatments. 1.964g and 1.798g three N treatments of grain weight were significantly higher than the control, a moderate level of nitrogen fertilizer N2 (100kg/hm ~ 2N) processing the grain weight highest in two experimental plots. Nitrogen application significantly improved tall fescue seed yield, the middle nitrogen levels N2 (100kg/hm ~ 2N) treatment of tall fescue seed yield reached the highest in two experimental plots were 2009.5kg/hm ~ 2 and 1185.1 kg / hm ~ 2, respectively, were increased by 125% and 35%. Nitrogen fertilization of Kentucky bluegrass seed yield formation also have a significant impact. Moderate nitrogen levels N2 (100kg/hm ~ 2N), the effect of treatment is best, its panicles in two experimental plots of 136 and 195 / m ~~; Kentucky bluegrass nitrogen treatments per panicle grains are significantly higher than the control, but the difference was not significant between the three N treatments; moderate nitrogen levels N2 (100kg/hm ~ 2N) processing grain weight highest in two experimental plots of 0.225g and 0.220g . Moderate nitrogen levels N2 (100kg/hm ~ 2N) deal with the actual production of Kentucky bluegrass in two experimental plots were the highest, respectively, to reach 111.4 kg / hm ~ 2 and 148.0kg/hm ~~ 2, and significantly higher than the control. 3. An appropriate increase in planting density increase per unit area of ??tall fescue seed panicles it. High-density D3 (6.3 plants / hm ~~ 2) treatment of tall fescue tiller number was significantly higher than the low-density D1 (4.2 Wanzhu / hm ~~ 2) and medium density D2 (5.0 Wanzhu / hm ~ 2) processing in two experimental plots of 4323 and 3859 / m ~~; seed panicles of final formation of high-density treatment was significantly higher than the low and medium density processing, respectively, 741 and 614 / m ~ 2 in two experimental plots . Grains per panicle and grain weight in the eastern side of the experimental field, between the different density processing none showed a significant difference in the west side of the experimental field, high-density D3 (6.3 Wanzhu / hm ~ 2) processing grains per panicle number and grain weight also higher than the low-, medium-density treatment, indicating increased tall fescue planting density of grains per panicle and grain weight did not adversely affect. The actual production of high density D3 (6.3 Wanzhu / hm ~ 2) processing are the highest in two experimental plots, respectively 1774.1kg/hm ~ 2 and 1230.7 kg / hm ~~. The results show that: the tall fescue can be a reasonable way to increase planting density to increase seed yield. Increasing planting density can significantly increase the total number of tillers per unit area of ??Kentucky bluegrass, but it does not increase the final seed panicles in the two experimental plots in 04 and was planted in 2007, the high-density D3 (11.1 Wanzhu / hm ~~ 2) The panicles processing to be significantly lower than the low-density D1 (6.6 Wanzhu / hm ~ 2) treatment, indicating high density D3 (11.1 Wanzhu / hm ~ 2) deal with more tillers become ineffective tillers. Three different density processing grains per panicle and seed setting rate, the differences were not significant. In the experimental plots planted the seed production in 2007, three different density levels to deal with the impact on grain weight significantly, but 04 planting seed production testing ground for medium density D2 (8.3 Wanzhu / hm ~ 2) processing grain weight highest significantly higher than the high-density D3 treatment, excessive high density affect the accumulation of nutrients in the grain and seed quality. From actual harvest yields, the actual output of the low-density D1 (6.6 Wanzhu / hm ~ 2) treatment in two experimental plots are the highest, respectively, 116.5 kg / hm ~ 2 and 166.4kg/hm ~~ 2 significantly higher than that of the high density D3 treatment. Kentucky bluegrass seed production, planting density to be controlled, to improve the conditions of the plants during the reproductive growth, in order to achieve the purpose of high quality. 22 tall fescue and 26 grass Poa species (or strain) field adaptability observable tall fescue varieties 'Triple A' good performance in the Shanghai region throughout the year turf quality and disease resistance in summer Kentucky bluegrass the strain 'KB6' annual turf quality in Shanghai and summer performance was stable, large area of ??urban green space and promotion. Through on summering the traits the field observation of the new line of tall fescue 'T6', 'the T6' summer lawn density and vertical growth were significantly better than the control variety 'Barlexas' recommended for further observation and test promotion in the Yangtze River Basin. Tall fescue and kentucky bluegrass mixed turf summer strong disease resistance in tall fescue unicast lawn, the lawn has a better ability of summering; survey found through different habitats of tall fescue turf summer incidence tall fescue lawn disease resistance index and soil temperature and lawn canopy temperature was a significant negative correlation: the higher the temperature, soil temperature and lawn canopy lawn disease resistance index lower, lawn diseases heavier. Therefore, by the mixed culture of different cool-season grass species and reduce the lawn soil temperature to reduce the incidence of cool-season lawns in summer.

Related Dissertations

  1. Research on Graph-Based Algorithm for Tagsnps Selection,Q78
  2. Research on Mud Density Measuring Method Using Ultrasonic,TE256.7
  3. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  4. Effect of Planting Densities and Modes on Lodging Resistance of Stem in Summer Maize,S513
  5. Study on Nitrogen Accumulation Characteristics of Winter Wheat with Yield of 10t/ha, Diagnosis and Nitrogen Application Technologies,S512.1
  6. The Study of Oat Straw Mixed Ensilage with Tall Fescue or Perennial Ryegrass in Tibet,S816.53
  7. Tracking Cells in High Density Image Sequences Based on Mean Shift Algorithm Combined with Topological Constraint,Q25
  8. Responses of the Double-Cropping Rice Population Growth and Nitrogen Uptake to Density and Nitrogen Management and the Diagnosis Based on NDVI,S511
  9. Influences of Density and Potassium Interaction on Physio-ecological Indicators and Quality of Flue-cured Tobacco in Yanbian,S572
  10. Effects of Different Application of Nitrogen Fertilizer Sources and Topping Methods on Growth, Development and Quality of Flue-cured Tobacco,S572
  11. Effects of Fertilization and Planting Density on Spearmint Essential Oil Yield and Quality,S573.9
  12. Genetic Analysis and Mapping of the Mutant Locus of a Dwarf and Compact Spike Mutant NAUH164 from Wheat Variety Sumai 3,S512.1
  13. Effects of Genotype and Nitrogen Fertilizeramount on the Quality and Sensory Evaluation in Flue-Cured Tobacco,S572
  14. Study on Cold Resistance Mechanism under Nitrogen of Tall Fescue Turfgrass,S688.4
  15. Studies on the Appliction of Organic Nitrogen Fertilizers to Soilless Culture in Cucumber,S642.2
  16. Effect of Adding Wet Brewers’ Grains and Molasses on Fermentation Quality of Mixed Ensilages of Common Vetch with Perennial Ryegrass or Tall Fescue,S816.53
  17. Copula-EGARCH-Kernel Density Estimation Model and Its Application,O211.3
  18. Influence of the Different Cultivation Measures on the Growth of Weedy Rice and Its Competition with Cultivated Rice,S511
  19. Genetic Analysis and QTL Mapping of Dwarf and Compact Spike Mutant of Sumai 3,S512.1
  20. The Study on the Production System of High Quality Sod of Tall Fescue,S688.4
  21. Change and Value of Serum Soluble Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1 in Acute Coronary Syndrome,R541.4

CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Garden Plant Cultivation and application technology > Lawns and ground cover plants
© 2012 www.DissertationTopic.Net  Mobile