Dissertation > Excellent graduate degree dissertation topics show

Study on Key Technology of Nursery Seedlings of Atyipiex Canexcens from American

Author: QiTongXiang
Tutor: ZhaoZhong
School: Northwest University of Science and Technology
Course: Forestry
Keywords: Atyipiex canexcens(Pursh)Nutt. twig cuttage breeding technology rooting rate shoot quality
CLC: S793.9
Type: Master's thesis
Year: 2013
Downloads: 12
Quote: 0
Read: Download Dissertation


Atyipiex canexcens(Pursh)Nutt.(AC)is a fast-growing quasi evergreen forage shrubwith tolerance to cold, drought, salinity, infertility, and has been introduced and cultivated inXinjiang, Qinghai and Shaanxi, proved to be a good pioneer tree species in ecologicalmanagement.However the import of AC seeds greatly improved the cost of domestic cultivation. Thelow seed viability from seedling propagation and the instable germination rate both cause thenursery stock from seedling propagation has much variation in quality and could not reach thestandard of mass plantation.Recently, twig cuttage breeding technology has developed markedly and was used inseedling production extensively. Scion nursery ageing, scion insufficiency in large scaleproduction, and low rooting and survival rate caused by over demand water spray in hightemperature period are the questions commonly encountered in the use of the technology.Moreover, root bury is necessary in the afforestation of AC because of its large crown. Theroot quality therefore is affecting the survival rate of forestation.In the current research we built a fertile effect model through parallel experiments andorthogonal regression experiment in order to analyze the problems in AC cuttage breedingmass production, improve the cuttage breeding tech, and determine the optimum N, P, and Kproportion suitable for promoting seedling quality in Jingchuan, Gansu Prov.. This researchcould provide theoretical basis for high quality AC nursery stock production. The conclusionsare listed as below:1.Intensive clipping is the key technology in AC scion nursery regeneration. Secondaryclipping can improve scion quantity and quality much more than the ordinary first clipping.This clipping method is good for large scale production.2.Sufficient watering in scion nursery three to seven days before cuttage can lift thequality of cutting wood and the cuttage survival rate by2.6%.3.Substrate tray cuttage breeding can help scion root development and growth.Transplanting with substrate almost eliminates the acclimation period, shortening transplantrejuvenation period by8-10days, improving transplant survival rate by13.9%. Seedling output rate is also improved.4.Late July to early August is the annual high temperature period in Jingchuan area,Gansu. Ca.50%sunshade can improve the rooting rate of cuttage wood by4.3%, shorteningadventitious rooting time.5.Belowground dry matter accumulation is increased most by P, and followed by N andK for AC individuals. The cross effects in increasing AC belowground dry matter areobserved significantly in N-P and N-K.6.The root growth of AC twig cuttage seedlings is robust under the fertile condition of N227.0-257.6kg/ha and P180.78-216.56kg/ha, meanwhile the belowground biomass is higherthan140g. The forestation survival rate and quality can be notably improved by thiscondition.7. It can improve seedlings quality to apply the rules of AC twig cuttage seedlings.

Related Dissertations

  1. The Research on Stem Cutting Propagation and Water Consumption of Ilex Centrochinensis,S792.99
  2. Cutting Propagation and Rooting Mechanism of Michelia Martinii (H.Lev.) Finet & Gagnep. Ex H. Lev,S685.99
  3. Cutting Propagation Techniques and Rooting Mechanism of Aquilaria Sinensis(Lour.) Gilg,S567.19
  4. Impacts of Several Kind of Plant Growth Regulator to the Fruit Setting Rate Andcuttage Technology in the Schisandra Chinensis Bill,S567.19
  5. Study on Affecting Factors to the Cuttage Survival of Lathyrus Latifolius,S541.9
  6. Study on Rapid Micropropagation Technique and Mechanism of Cutting Rooting of Broussonetia Papyrifera,S792.17
  7. The Preliminary Studies on Propagation Techniques and Rooting Mechanism of Tree Peony Stem Cuttings,S685.11
  8. Study on Affecting Factors to the Cuttage Survival of Alfalfa,S541.9
  9. Studies on the Cutting Propagation Technique of Akebia Trifoliate (Thunb.) Koidz,S567.19
  10. Genetic Diversity and Selection of Super Geographical Provenances of Dendrocalamopsis Oldhami,S795
  11. Studies on the Cutting Rapid Propagation Technology of Schisarutra Chinensis,S567.19
  12. Preliminary Study on Twig of Sea Buckthorn by Micro-cuttage,S793.6
  13. Study on the Technology of Cutting Propagation and Bonsai Shaping of Podocarpus Macrophyllus,S688.1
  14. Soft Cutting Propagation Techniques and Rooting Mechanism of Phoebe bournei (Hemsl.) Yang,S792.34
  15. Study on Micropropagation of Three Kinds of Sympodial Bamboo,S795
  16. Silver Staining mRNA Differential Display Analysis under Aluminum Stress Condition in Chinese Fir Different Clones,S791.270.1
  17. Studies on Rapid Micropropagation and Cutting Technique and the Rooting Mechanism of Potentilla Fruticosa L.,S685.99
  18. Studies on Characteristics and Micropropagation of Grapevine Rootstocks,S663.1
  19. Beibei Yung breeding technology research,S792.99
  20. Green shoots of southern Zhejiang influencing factors of yield and quality,S795

CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved shrubs > Other
© 2012 www.DissertationTopic.Net  Mobile