scholarly journals Effects of Age and Stand Density of Mother Trees on EarlyPinus thunbergiiSeedling Establishment in the Coastal Zone, China

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Peili Mao ◽  
Guangxuan Han ◽  
Guangmei Wang ◽  
Junbao Yu ◽  
Hongbo Shao
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Seedling Growth ◽  
Biomass Allocation ◽  
Stand Density ◽  
Height Growth ◽  
Relative Height ◽  
Mass Ratio ◽  
Mother Tree ◽  
Seedling Biomass

Effects of age and stand density of mother tree on seed germination, seedling biomass allocation, and seedling growth ofPinus thunbergiiwere studied. The results showed that age of mother tree did not have significant influences on seed germination, but it was significant on seedling biomass allocation and growth. Seedlings from the minimum and maximum age of mother tree had higher leaf mass ratio and lower root mass ratio than from the middle age of mother tree. Moreover, they also had higher relative height growth rate and slenderness, which were related to their biomass allocation. Stand density of mother tree mainly demonstrated significant effects on seed germination and seedling growth. Seed from higher stand density of mother tree did not decrease germination rate, but had higher mean germination time, indicating that it delayed germination process. Seedlings of higher stand density of mother tree showed higher relative height growth rate and slenderness. These traits of offspring from higher stand density of mother tree were similar to its mother, indicating significant environmental maternal effects. So, mother tree identity of maternal age and environments had important effects on natural regeneration of the coastalP. thunbergiiforest.

scholarly journals The effect of strong microwave electric field radiation on: (1) vegetable seed germination and seedling growth rate

2013 ◽  
Vol 100 (2) ◽  
pp. 179-184 ◽  
Author(s):  
Audrius Radzevičius ◽  
Sandra Sakalauskienė ◽  
Mindaugas Dagys ◽  
Rimantas Simniškis ◽  
Rasa Karklelienė ◽  
...  
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Electric Field ◽  
Seedling Growth ◽  
Vegetable Seed ◽  
Seedling Growth Rate ◽  
Field Radiation

LOW-TEMPERATURE GROWTH RESPONSES OF THE TOMATO

1968 ◽  
Vol 48 (3) ◽  
pp. 281-286 ◽  
Author(s):  
G. A. Kemp
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Low Temperature ◽  
Seedling Growth ◽  
Low Temperatures ◽  
Fruit Set ◽  
Growth Responses ◽  
Growth Phases ◽  
Night Temperature ◽  
Temperature Growth

The effects of low temperatures on several growth phases of the tomato were studied. The tests, each conducted over a 2-week period, included seed germination at 8.5 °C, rate of seedling growth at a night temperature of 10 °C, root and top growth of plants in soil at 15 °C, and fruit set at a night temperature of 4.5 °C.Varietal response to growth rate at low temperatures differed in all phases studied, and varieties that performed well in some phases did not always perform well in others. Of the varieties studied, six grew well under most of the low-temperature conditions. These were: Earlinorth, Bonita, Azerbidzivisky, P.I. 205040, P.I. 280597, and Cold Set.

scholarly journals The effect of pre-sowing seed treatment on seedlings growth rate and their excretory activity

2020 ◽  
Vol 11 (1) ◽  
pp. 60-66
Author(s):  
A. I. Bozhkov ◽  
M. K. Kovalova ◽  
Z. A. Azeez ◽  
А. V. Goltvjansky
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Sodium Hypochlorite ◽  
Seedling Growth ◽  
Root Exudates ◽  
Seed Treatment ◽  
Running Water ◽  
The Third ◽  
Pea Seeds ◽  
Sowing Seed

The importance of studying pre-sowing seed treatment lies in the possibility of regulating the rate of seed germination, the intensity of their growth and obtaining root exudates in biotechnology. The effect of three pre-sowing treatment methods was examined (control – washing with running water; the first method – washing with 0.05% sodium permanganate solution; the second method – 30 se­conds in 70% ethyl alcohol (C2H5OH) and 30 minutes in 5% sodium hypochlorite (NaOCl); the third method – 5 minutes in 70% C2H5OH and 40 minutes in 5% NaOCl) on the growth rate, germination rate, excretion rate of seeds of wheat and peas and composition (of protein, carbohydrate, amino acid content) of root exudates from the first to the third day of growth in order to obtain root exudates. It was revealed that the same pre-sowing treatment of wheat and pea seeds has a different effect on the rate and variability of seedling growth from the first to the third day, as well as on the qualitative and quantitative composition of root exudates. It was shown that pre-sowing treatment of wheat and pea seeds for 5 minutes with 70% ethanol followed by treatment with sodium hypochlorite (a “hard” treatment method) accelerates seedling growth and seed germination. This method of treatment reduces the intensity of excretion of root exudates and composition in wheat, but it increases the intensity of excretion in peas. The discovered effects can be explained by hormesis. Additionally, the third method of pre-sowing seed treatment can be used in root technologies for obtaining root exudates.

scholarly journals The Response of Seed Germination and Seedling Growth Of Papaya (Carica papaya L.) CV CALINA to The Concentration Treatments and The Duration of Seed Soaked In Coconut Water

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Agus - Zainudin ◽  
Almas Adlina Adini
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Seedling Growth ◽  
Carica Papaya ◽  
Block Design ◽  
Coconut Water ◽  
Randomized Design ◽  
Randomized Complete Block Design ◽  
Vigour Index ◽  
Completely Randomized Design

This research aimed to carry out the response of seed germination and seedling growth of Calina papaya to the seed soaked in coconut water. It was conducted from April to June 2017. The study comprised two designs of experiment i.e. the Completely Randomized Design for the seed germination and the Randomized Complete Block Design for the seedling growth of papaya. There were 25 treatment combinations obtained and each treatment was replicated three times. The treatment factors comprised the concentration and the duration of seed soaked in coconut water. The results showed that the seed immersion in the 80% concentration of coconut water for 8 hours had the highest growth rate and vigour index. Meanwhile, the seed immersion in the 60% concentration of coconut water for 8 hours showed the highest percentage of germination. The seed immersion for eight hours resulted in the seedling growth of papaya.

Effects of Sand Burial Depth on Seedling Growth of Caragana microphylla

2012 ◽  
Vol 610-613 ◽  
pp. 3495-3499 ◽  
Author(s):  
Yu Hui He ◽  
Xin Ping Liu ◽  
Ha Lin Zhao
Keyword(s):  
Seedling Growth ◽  
Biomass Allocation ◽  
Northern China ◽  
Burial Depth ◽  
Seedling Height ◽  
Sandy Land ◽  
Shrub Species ◽  
Sand Burial ◽  
Caragana Microphylla ◽  
Seedling Biomass

Caragana microphylla is a pioneer leguminous shrub species, and plays an important role in sand fixing and desertification control in the Horqin Sandy Land of Northern China. In this study, seedlings were buried by sand to depths of 0 (control), 1/3, 2/3, 1 and 4/3 of their mean height, and the effects of sand burial depth on seedling growth of Caragana microphylla were tested. Results show that with increasing burial depth, biomass allocation to leaves decrease, while stem biomass allocation increase, and both shoot and root growth of C. microphylla are stimulated and seedling biomass is the highest when burial depth is 2/3 of seedling height. Therefore, moderate burial could facilitate seedlings growth of C. microphylla

Height growth of planted black spruce seedlings in response to interspecific vegetation competition: a comparison of four competition measures at two measuring positions

2000 ◽  
Vol 30 (4) ◽  
pp. 573-579 ◽  
Author(s):  
G G Wang ◽  
J Su ◽  
J R Wang
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Picea Mariana ◽  
Black Spruce ◽  
Height Growth ◽  
Percent Cover ◽  
Relative Height ◽  
Full Sunlight ◽  
Significant Relationships ◽  
Hemispherical Photographs

Four simple measures of interspecific competition (percent cover visually estimated in the field, percent cover derived from hemispherical photographs, percent full sunlight measured by a ceptometer, and gap light index derived from hemispherical photographs) obtained at two reference positions (the top and the middle of crop seedlings) were evaluated in relation to two growth variables (relative height growth rates in 1998 and during 1996 to 1998) of black spruce (Picea mariana (Mill.) BSP) seedlings planted on boreal mixedwood sites in southeastern Manitoba. The four competition measures assessed at the two measuring positions explained 57.2-68.0% of the total variation in black spruce height growth rate. Significant relationships were found among the four measures, and between the two measuring positions for each measure. The measuring position was not critical for all competition measures except the percent full sunlight measured by the ceptometer, for which the middle position was much better. When assessed at their preferred positions, the four competition measures ranked as follows: (i) percent cover derived from hemispherical photographs or percent full sunlight measured by the ceptometer; (ii) gap light index derived from hemispherical photographs; and (iii) visually estimated percent cover of vegetation.

scholarly journals Effects of Oxidized Brown Coal Humic Acid Fertilizer on the Relative Height Growth Rate of Several Tree Species

2018 ◽  
Author(s):  
Ganchudur Tsetsegmaa ◽  
Khaulenbek Ahmedi ◽  
Wonwoo Cho ◽  
Sora Lee ◽  
Romika Chandra ◽  
...  
Keyword(s):  
Growth Rate ◽  
Humic Acid ◽  
Brown Coal ◽  
Management Practices ◽  
Field Experiments ◽  
Organic Fertilizer ◽  
Chemical Properties ◽  
Height Growth ◽  
Relative Height ◽  
Positive Effect

Field experiments were carried out during 2011-2014 at the Research and Experimental Center to Combating Desertification located in the Elsen Tasarkhai station of central Mongolia. The study was aimed to identify the effects of oxidized brown coal humic acid fertilizer on the relative growth rate of several trees for forest rehabilitation. The trees used were Populus sibirica, Salix ledebouriana and Acer tataricum. The experiment was carried out with the concentrations of 2,000, 10,000 and 20,000 mg L-1 of humic acid fertilization treatments. The measurement of relative height growth rate (RHGR) was conducted for a period of 4 years. The treatments showed significant differences within humic fertilizer concentrations which differed depending on the species. Compared to the monthly RHGR over the study, the treatment of fertilizers were significantly better for tree growth. P. sibirica in the 10,000 and 20,000 mg L-1 humic acid fertilizers had significant height growth rates. In addition, when the humic acid treatments were compared to control, A. tataricum decreased over the years which were statistically significant for high growth rate and a positive effect of humic acid fertilization treatments was observed. Furthermore, results showed that oxidized brown coal humic acid fertilizers as organic fertilizer can have a positive effect for the growth of A. tataricum during the study years. The results showed that the soil chemical properties EC, CO2, NO3, and K2O were significant among all the treatments compared to the control. The effect on P2O5 statistically significantly increased among all the treatments. However, pH and Mg were not significant effect among all the treatments. Combining the results obtained from the oxidized brown coal humic acid fertilization with sustainable land management practices can help improve soil organics for environmental issues in degraded sandy soil regions.

scholarly journals Evaluation of Seed Nut Size as Index of Selection for Superior Seed Quality Attributes in Two Biotypes of Cashew (Anacardium occidentale)

2015 ◽  
Vol 72 (1) ◽  
pp. 69-81
Author(s):  
T. O. Kehinde ◽  
M. A. Adebisi ◽  
A. O. Alegiledoye ◽  
O. O. Ajani ◽  
K. A. Shofuyi
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Seedling Growth ◽  
Seed Weight ◽  
Seed Quality ◽  
Seed Length ◽  
Seedling Vigour ◽  
Seedling Growth Rate ◽  
Seed Width ◽  
100 Seed Weight

Abstract Quality seed nuts are germane to propagation of the cashew plant. Seed nut fraction and genotypes have been identified to influence seed quality of crop plant. Unexpectedly, seed size effect has not been well documented in Brazilian and local biotypes of cashew grown in Nigeria. An experiment was initiated to investigate the effect of three nut sizes and two biotypes of cashew on seed quality (physical and physiological) traits. Seed nut were collected from three cashew plants of the same age of each of the biotypes and were allowed to stay for 60 days after collection. The experiment was carried out in a factorial arrangement laid out in a completely randomized design with three replicates using two factors (nut size and biotypes) in 2011 cropping season in both laboratory and screen house tests. Data were collected on physical characters such as seed length, seed width, 100 seed weight and seed imbibition rate while physiological characters were seed germination and early vigour traits. Data obtained were analysed statistically using Tukey HSD test at 5% probability level. The result revealed that some of the characters were significantly different from one another. Seed nut fraction and biotype had considerable effect on seed length, seed width, seed imbibition rate and 100 seed weight. The two factors (nut size and biotype) interaction had profound effect on seed width only. On seed physiological quality, biotype effect was significant on seedling fresh and dry weights and seedling growth rate whereas seed nut size had considerable effect on seed germination, seedling vigour index, seedling fresh weight and seedling growth rate. The interaction effect of nut size and biotype recorded significant effect on the above four characters. Brazilian biotype had superior physical characters (seed length, width and weight) but with low imbibitions rate while medium and large nut sizes gave the highest seed germination and seedling vigour. Also, medium and large nuts had the highest seedling fresh weight whereas the highest seedling growth rate was recorded with small size seed. However, large, medium and small nut sizes of local biotype had the highest imbibition rate, whereas small, medium and large nut size of Brazilian biotype gave the highest 100 seed weight. On seedling emergence, large nuts of local biotype recorded the highest seedling emergence and seedling vigour index. Medium nuts of the two biotypes of cashew are recommended for cashew seed multiplication. Further research on physiology of cashew nut sizes during storage and osmo and hydro priming treatment effect are necessary and therefore advocated.

scholarly journals Effects of Oxidized Brown Coal Humic Acid Fertilizer on the Relative Height Growth Rate of Three Tree Species

Forests ◽  
2018 ◽  
Vol 9 (6) ◽  
pp. 360 ◽  
Author(s):  
Ganchudur Tsetsegmaa ◽  
Khaulenbek Akhmadi ◽  
Wonwoo Cho ◽  
Sora Lee ◽  
Romika Chandra ◽  
...  
Keyword(s):  
Growth Rate ◽  
Humic Acid ◽  
Brown Coal ◽  
Tree Species ◽  
Height Growth ◽  
Relative Height
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