scholarly journals Effects of film-bottomed treatment on seedling emergence and growth of agana korshinskiiarid northwestern China

2010 ◽  
Vol 56 (No. 4) ◽  
pp. 186-193
Author(s):  
X. Zhou ◽  
Y. Yan ◽  
Ch. Wan ◽  
H. Wang ◽  
L. Wu ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Seedling Emergence ◽  
Maximum Growth ◽  
Northwestern China ◽  
Promoting Effect ◽  
Basal Diameter ◽  
Shoot Height ◽  
Caragana Korshinskii ◽  
Arid Northwestern China ◽  
Emergence Percentage

A field study was conducted to study the effectiveness of film-bottomed treatment (FBT) on the seed germination and seedling establishment of <I>Caragana korshinskii</I> Kom. in the arid Hexi Corridor of northwestern China in 2007 and 2008. The experiment involved three different depths of film-bottomed treatments (DFBT) (80, 90 and 100 cm) and a control with twelve replications in each treatment. Soil moisture, seedling emergence percentage, leaf characteristics, shoot height, main root length, basal diameter, biomass, biomass allocation, as well as root system distribution, were studied and were found to be significantly higher with FBT in respect to the check (CK) values. Soil moisture content increased with depths of film-bottomed treatments. Our study demonstrates that <I>C. korshinskii</I> can be grown successfully using FBT in arid areas and 90 cm DFBT gives the maximum growth-promoting effect.

scholarly journals Controlling Plug Height of Verbena, Celosia, and Pansy by Treating Seeds with Paclobutrazol

HortScience ◽  
2006 ◽  
Vol 41 (1) ◽  
pp. 158-161 ◽  
Author(s):  
Stanislav V. Magnitskiy ◽  
Claudio C. Pasian ◽  
Mark A. Bennett ◽  
James D. Metzger
Keyword(s):  
Filter Paper ◽  
Seedling Emergence ◽  
Seedling Height ◽  
Practical Application ◽  
Shoot Height ◽  
Soaking Time ◽  
Water Solutions ◽  
Seed Soaking ◽  
Celosia Cristata ◽  
Emergence Percentage

Shoot stretching in plug production reduces quality and makes mechanized transplanting difficult. The objectives of this study were to measure seedling emergence and shoot height of plugs as affected by paclobutrazol application during seed soaking, priming, or coating on seedling emergence and height. Verbena (Verbena ×hybrida Voss. `Quartz White'), pansy (Viola wittrockiana L. `Bingo Yellow Blotch'), and celosia (Celosia cristata L. `New Look') seeds were soaked in water solutions of paclobutrazol and subsequently dried on filter paper at 20 °C for 24 h. Soaking seeds in paclobutrazol solutions before sowing reduced growth and percentage seedling emergence of verbena and pansy but had little effect on those of celosia. Verbena seeds soaked in 50, 200, or 500 mg paclobutrazol/L for 5, 45, or 180 min produced fewer and shorter seedlings than controls. Osmopriming verbena seeds with 10 to 500 mg paclobutrazol/L reduced seedling emergence. Seedling height and emergence percentage of pansy decreased with increasing paclobutrazol concentrations from 2 to 30 mg·L–1 and with soaking time from 1 to 5 min. The elongation of celosia seedlings was reduced by soaking seeds in 10, 50, 200, or 500 mg paclobutrazol/L solutions for 5, 180, or 360 min. However, these reductions were negligible and without any practical application.

scholarly journals Shading improves initial growth and quality of Parkia multijuga Benth. seedlings

2019 ◽  
pp. 1908-1913
Author(s):  
Noemi Vianna Martins Leão ◽  
Elizabeth Santos Cordeiro Shimizu ◽  
Sérgio Heitor Sousa Felipe
Keyword(s):  
Seedling Emergence ◽  
Quality Standard ◽  
Total Biomass ◽  
Timber Species ◽  
Initial Growth ◽  
Shoot Height ◽  
Full Sunlight ◽  
Emergence Percentage ◽  
Light Quantity ◽  
Different Levels

During the production of forest seedlings, light quantity can indicate the degree of tolerance of tree species to shading conditions and provide information to obtain seedlings with a higher quality standard. The objective of this study was to evaluate the effect of different levels of shading on the emergence and the quality standard of Parkia multijuga Benth. seedling, a timber species that can be used in landscaping and restoration of degraded areas. The experimental design was completely randomized, consisting of three treatments: full sunlight (control; 2050 µmol m2 s2), 50 (1025 µmol m2 s2), and 70% (615 µmol m2 s2) shading obtained with black polyethylene screens. The results showed that the applied treatments did not significantly influence the emergence percentage. However, under unshaded conditions (i.e., full sunlight), the seeds displayed a higher velocity index and a shorter mean time of seedling emergence. On the other hand, the different levels of shading (50 and 70%) improved the growth performance (e.g., higher shoot height, collar diameter, number of leaves) and quality (e.g., higher Dickson Quality Index (DQI)) of P. multijuga seedlings. Furthermore, seedlings under 50 and 70% shading displayed a significant increase in the total biomass compared to those exposed to the full sunlight condition (243 and 195%, respectively). In addition, the DQI was higher in plants grown at 50 and 70% shading in comparison with the full sunlight treatment (145 and 85%, respectively). The shading level of 50% is recommended for the production of P. multijuga seedlings with the highest quality standard in the nursery beds in Brazilian Amazon.

EMERGENCE AND SEEDLING GROWTH OF INBRED LINES OF CORN AT SUBOPTIMAL ROOT-ZONE TEMPERATURES

1987 ◽  
Vol 67 (2) ◽  
pp. 409-415 ◽  
Author(s):  
A. MENKIR ◽  
E. N. LARTER
Keyword(s):  
Zea Mays ◽  
Seedling Growth ◽  
Root Zone ◽  
Seedling Emergence ◽  
Correlation Coefficients ◽  
Dry Weight ◽  
Inbred Lines ◽  
Root Zone Temperature ◽  
Emergence Percentage ◽  
Zone Temperature

Based on the results of an earlier paper, 12 inbred lines of corn (Zea mays L.) were evaluated for emergence and seedling growth at three controlled root-zone temperatures (10, 14, and 18 °C). Low root-zone temperatures, 10 and 14 °C, were detrimental to emergence, seedling growth, and root growth of all inbred lines. Differential responses of inbred lines were observed within each temperature regime. The differences in seedling emergence among lines became smaller with increasing root-zone temperature, while the reverse was true for seedling dry weight. Simple correlation coefficients showed a significantly (P = 0.05) negative association between emergence percentage and emergence index (rate). Neither of these two emergence traits was significantly correlated with seedling dry weights. Seedling dry weights were significantly (P = 0.01) and positively associated with root dry weights. Two inbred lines exhibited good tolerance to low root-zone temperatures, viz. CO255 and RB214. A significant and positive correlation existed between emergence percentage at a root-zone temperature of 10 °C and field emergence in test with the same genotypes reported earlier. Selection at a root-zone temperature of 10 °C for a high percentage of seedling emergence, therefore, could be effective in identifying genotypes capable of germinating in cool soils. Furthermore, the significantly (P = 0.01) positive relationship between seedling dry weights at all root-zone temperatures and those from the field test suggest that strains with vigorous seedling growth in the field could be identified using low root-zone temperature regimes.Key words: Zea mays, root-zone temperature, cold tolerance

Evidence for a warm-humid climate in arid northwestern China during 40?30ka BP

2004 ◽  
Vol 23 (23-24) ◽  
pp. 2537-2548 ◽  
Author(s):  
B YANG ◽  
Y SHI ◽  
A BRAEUNING ◽  
J WANG
Keyword(s):  
Northwestern China ◽  
Humid Climate ◽  
Arid Northwestern China

Isotopic composition of precipitation over Arid Northwestern China and its implications for the water vapor origin

2009 ◽  
Vol 19 (2) ◽  
pp. 164-174 ◽  
Author(s):  
Jianrong Liu ◽  
Xianfang Song ◽  
Xiaomin Sun ◽  
Guofu Yuan ◽  
Xin Liu ◽  
...  
Keyword(s):  
Water Vapor ◽  
Isotopic Composition ◽  
Northwestern China ◽  
Arid Northwestern China
Sign in / Sign up

Export Citation Format

Share Document