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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1976.tde-20240301-152957
Document
Author
Full name
Osvaldo de Menezes Porto
Institute/School/College
Date of Defense
Published
Piracicaba, 1976
Supervisor
Title in Portuguese
Influência de métodos de semeadura e de repicagem no desenvolvimento do porta-enxerto de “limoeiro”-cravo (Citrus limonia, Osbeck)
Keywords in Portuguese
DESENVOLVIMENTO
LIMÃO-CRAVO
PORTA-ENXERTO
REPICAGEM
SEMEADURA
Abstract in Portuguese
A presente investigação teve por objetivo estudar o efeito de métodos de semeadura e repicagem na qualidade e no tempo necessário para “seedlings” de “limoeiro”-cravo atingirem o estádio de enxertia. O experimento foi conduzido em blocos ao acaso, com quatro repetições, com 50 “seedlings” por parcela, sendo o período total de observações de 474 dias. Os tratamentos usados foram: SSP - semeadura em saco plástico com repicagem aos 12 cm de altura; SAI - semeadura em areia com repicagem para saco plástico no estádio de palito de fósforo e posterior repicagem aos 12 cm de altura; SAF - semeadura em areia com repicagem no estádio de palito de fósforo; SC12 - semeadura em alfobre com repicagem aos 12 cm de altura; SC12D - semeadura em alfobre com repicagem aos 12 cm de altura, sendo o “seedling” decepado à altura do colo; SC20 - semeadura em alfobre com repicagem aos 20 cm de altura; SC20D - semeadura em alfobre com repicagem aos 20 cm de altura, sendo o “seedling” decepado à altura do colo; SC28 - semeadura em alfobre com repicagem aos 28 cm de altura; SC28D - semeadura em alfobre com repicagem aos 28 cm de altura, sendo o “seedling” decepado à altura do colo. Para avaliar a expressão do potencial poliembriônico das sementes foi usado: semeadura em areia, semeadura em alfobre convencional, e teste em germinador STULTS. A investigação mostrou que: A expressão do potencial poliembriônico das sementes foi maior quando elas germinaram no germinador STULTS do que quando germinadas em condições de campo, independentemente do método de semeadura usado. Semeadura em substrato de areia, conferiu às sementes uma menor percentagem de germinação. Os “seedlings” que alcançaram o estádio de enxertia, em menor período de tempo, a partir da semeadura, foram os pertencentes aos tratamentos: SSP e SAF. Porém, foram os “seedlings” pertencentes a SSP que atingiram o estádio de enxertia, com menor período de permanência, no viveiro. Entre os “seedlings” dos tratamentos SC12, SC20 e SC28 foram os do SC28 que atingiram o estádio de enxertia, com maior período de permanência, no viveiro. Os “seedlings” do tratamento SSP foram os que atingiram maior percentagem de plantas no estádio de enxertia, no final das observações, porém, não apresentando diferença significativa com os “seedlings” dos tratamentos: SC12 e SAF. O sistema radicular dos “seedlings” foi influenciado pelos tratamentos. Os “seedlings” que apresentaram maior peso seco de radicelas, após 474 dias da semeadura, foram os pertencentes aos tratamentos: SAF, SAI, SC12 e SSP. A maior concentração de radicelas situou-se até 15 cm, tanto no sentido horizontal quanto no vertical.
Abstract in English
The present investigation had to objective study the effects of sowing methods and transplanting on the quality as well as on the necessary time for Rangpur lime seedlings achieve the budding stadium. The experiment was carried out in randomized blocks. The treatments used: SSP - Sowing in plastic bags and transplanting at the height of 12 cm. SAI - Sowing in sand and transplanting to plastic bags at “palito de fósforo” stadium, and transplanting at the height of 12 cm. SAF - Sowing in sand and transplanting like “palito de fósforo” stadium. SC12 - Sowing in seedbed and transplanting at the height of 12 cm. SC12D - Sowing in seedbed and transplanting at the height of 12 cm, being the seedlings cut off at the collum. SC20 - Sowing in seedbed and transplanting at the height of 20 cm. SC20D - Sowing in seedbed and transplanting at the height of 20 cm, being the seedlings cut off at collum. SC28 - Sowing in seedbed and transplanting at the height of 28 cm. SC28D - Sowing in seedbed and transplanting at the height of 28 cm, being the seedling cut off at the collum. To evaluate the effects of different sowing conditions on the expression of the polyembryonic potential of the seeds, the germination rate was measured in sand, conventional seedbed and STULTS germinator. The seeds showed greater expression of polyembryonic potential when they germinated in STULTS germinator than in field conditions, independently of the sowing method utilized. The smallest percentage of germination was observed when sand was utilized as substratum. The smallest period of time, from sowing to budding stadium, was observed in seedlings of treatments SSP and SAF. However, seedlings of treatment SSP were those ones achieved budding stadium with the smallest period of permanence in the nursery. Comparison of treatments: SC12, SC20 and SC28 showed that the seedlings of SC28 achieved budding stadium with the longest period of permanence in the nursery. The greate percentage of seedlings that achieved budding stadium, at the end of the experiment, was observed, in treatment SSP, although the treatments SC12 and SAF did not differ significantly from that one. The feeder root system of the seedlings was influenced by the treatments. Seedlings in treatments SAF, SAI, SC12 and SSP presented after 474 sowing days more dry weight of feeder root than in other treatments. The highest concentration of feeder root situated until 15 cm, as in the horizontal sense as in the vertical sense.
 
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Publishing Date
2024-03-14
 
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