Seedling Emergence and Establishment under Drained Conditions in Rice Direct-Sown into Puddled and Leveled Soil —Effect of calcium peroxide seed coating and sowing depth—

2002 ◽  
Vol 5 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Toru Sato ◽  
Sachio Maruyama
Keyword(s):  
Seedling Emergence ◽  
Seed Coating ◽  
Calcium Peroxide ◽  
Sowing Depth

scholarly journals INFLUENCE OF SUGARCANE STRAW AND SOWING DEPTH ON THE EMERGENCE OF WEED SPECIES

2015 ◽  
Vol 33 (3) ◽  
pp. 405-412 ◽  
Author(s):  
P. V. SILVA ◽  
P. A. MONQUERO ◽  
F. B. SILVA ◽  
N. C. BEVILAQUA ◽  
M. R. MALARDO
Keyword(s):  
Ricinus Communis ◽  
Seedling Emergence ◽  
Dry Mass ◽  
Weed Species ◽  
Sowing Depth ◽  
Sugarcane Straw ◽  
Randomized Design ◽  
Significant Difference ◽  
Completely Randomized Design ◽  
Luffa Aegyptiaca

ABSTRACT This study aimed to understand the influence of sowing depth and the amount of sugarcane straw on the emergence of weed species Luffa aegyptiaca Miller (Cucurbitaceae); Mucuna aterrima Piper & Tracy (Fabaceae - Leguminosae) and Ricinus communis (Euphorbiaceae). A completely randomized design with a 5 x 4 x 3 factorial layout with four replications was used, at five sowing depths (0, 2, 4, 8 and 10 cm), four different amounts of sugarcane straw (0, 5, 10 and 15 t ha-1) and three different evaluation periods (7, 14 and 21 days after sowing). After sowing, different amounts of sugarcane straw (0, 5, 10 and 15 t ha-1) were deposited on soil. Seedling emergence was analyzed at 7, 14 and 21 days after sowing, counting the number of seedlings that had emerged. At the end of the trial, weed height (cm), leaf area (cm2) and shoot dry mass (g) were measured. In relation to emergence ability, studied species presented different responses according to sowing depth and to the amount of sugarcane straw deposited on the soil. For the L.aegyptiacaand M.aterrima, no significant difference was observed in the interaction between depth and sugarcane straw, showing the adaptation of these species to no-burn sugarcane system. For R.communis, seeds placed at 0 cm of sugar cane straw depth were observed to favor the emergence of seedlings.

Studies on some sources of variation in carrot root weight

1981 ◽  
Vol 96 (3) ◽  
pp. 549-556 ◽  
Author(s):  
P. J. Salter ◽  
I. E. Currah ◽  
Jane R. Fellows
Keyword(s):  
Population Density ◽  
Seedling Emergence ◽  
Size Variation ◽  
Root Weight ◽  
Low Density ◽  
Plant Variation ◽  
Sowing Depth ◽  
Seedling Size ◽  
Weight Variation ◽  
Root Size

SUMMARYFive investigations were carried out to determine the magnitude of root-size variation within crops of cv. Chantenay Supreme grown under competitive and non-competitive conditions, and to study possible sources of inter-plant variation.In the first experiment root-size variation from crops grown at a high population density (245 plants/m2) and at a low density (25 plants/m2) were compared over a 21-week period from sowing. The c.v.s of root weight were always higher from the high density than from the low density over the harvesting period from 11 to 21 weeks after sowing, and ranged from 74 to 94% and from 50 to 63%, respectively. A second study showed that even with a very low population density (3 plants/m2) the c.v. of root weight at harvest was 58%. The third study showed that 40% of the root weight variation was accounted for by the time of seedling emergence. The results of a pot experiment indicated that when the size of seed, sowing depth, rooting medium and time of seedling emergence were made as uniform as possible, a very uniform population of roots was produced with a c.v. of root weight of 32%. In the final field experiment when time of seedling emergence, seed size and spatial distribution of the plants were the experimental variables, the results confirmed the importance of variability in time of seedling emergence and seedling size in creating variation at an early stage of growth.The results of these studies indicate that competition per se was not a prime source of variation in root size but magnified any initial variation within the crop at the time of seedling establishment. The importance of this early establishment phase in determining the spread of root-size distribution within a crop is discussed together with the factors which influence the time of seedling emergence and seedling size.

scholarly journals Sowing depth of annual ryegrass seed on different substrates as a vigor test

2019 ◽  
Vol 41 (2) ◽  
pp. 196-204
Author(s):  
Roberto Caetano de Oliveira ◽  
Carlos Eduardo da Silva Pedroso ◽  
Vanessa Nogueira Soares ◽  
Lílian Madruga de Tunes ◽  
Géri Eduardo Meneghello ◽  
...  
Keyword(s):  
Rice Husk ◽  
Soil Cover ◽  
Seedling Emergence ◽  
Accelerated Aging ◽  
Annual Ryegrass ◽  
Coconut Fiber ◽  
Sowing Depth ◽  
Physiological Quality ◽  
Forage Utilization

Abstract: Annual ryegrass seeds having low physiological quality can lead to the formation of pastures with undesirable plant stands for soil cover and forage utilization pastures. Thus, the objective of this study was proposing a vigor test to classify annual ryegrass seeds. For that, different sowing depths (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 cm) over three substrates (sand, coconut fiber, and carbonized rice husk) were tested to differentiate the physiological quality of four seed lots of annual ryegrass cv. BRS Ponteio having similarities in germination and moisture. The seed lots were classified according to vigor through the field seedling emergence (FSE), 1,000-seeds weight, saturated salt accelerated aging, and germination first count. The 2.5 cm of sand sowing depth and 3.0 cm of coconut fiber sowing depth provided separation of seed lots in similar groups of those reported to FSE test through the seedling emergence and speed of seedling emergence tests.

Critical factors influencing no-till establishment of short-term ryegrass (Lolium multiflorum) into a kikuyu (Pennisetum clandestinum) pasture

2010 ◽  
Vol 61 (2) ◽  
pp. 192 ◽  
Author(s):  
K. Sinclair ◽  
P. J. Beale
Keyword(s):  
Management Practices ◽  
Lolium Multiflorum ◽  
Seedling Emergence ◽  
Effect Of Temperature ◽  
Seed Type ◽  
Short Term ◽  
Dairy Farmers ◽  
Sowing Depth ◽  
Mulch Cover ◽  
Tropical Grass

In the subtropical dairy region of Australia, poor establishment of short-term ryegrass (Lolium multiflorum) oversown into tropical grass pastures is a common occurrence requiring re-sowing. A survey of subtropical dairy farmers was undertaken to relate management practices used in oversowing ryegrass to sward establishment and subsequent growth. Two glasshouse studies were also conducted to examine (1) the effect of temperature, ploidy, seeding depth, and mulch cover on ryegrass emergence and (2) the effect of temperature and ploidy on growth and development of ryegrass seedlings. Subtropical dairy farmers only used grazing management to control the growth and residue levels of the tropical grass pasture before oversowing. The average residue was 1200 kg DM/ha to a 5 cm height, and where the residue amount and height were higher, the ryegrass failed to establish. Tetraploid cultivars were preferred in early sowings and diploid cultivars were favoured in later sowings. When direct-drilled, either seed type was sown to a depth of 1–3 cm. A 20–30 kg/ha sowing rate was common for diploids and was at least 2× that for tetraploids. A seedling count <600 plants/m2 resulted in 1317 tillers/m2 in spring compared with 1886 tillers/m2 for a count >600 plants/m2. The ryegrass seedling emergence study was conducted at 25/15°C (day 0600–1800 hours)/(night 1800–0600 hours) for 14 days after sowing and then repeated at 20/10°C. The treatment combinations were 2 seed types (tetraploid or diploid) × 4 sowing depths (0, 1, 3, or 6 cm) × 3 mulch heights (1, 5, or 10 cm above surface). The main effects, seed type, sowing depth, and mulch height had significant (P < 0.05) effects on seedling emergence, irrespective of temperature, and all interactions were significant (P < 0.05) with the exception of the seed type × mulch height interaction. At the higher temperature the proportion of emerged seedlings declined from 0.52 to 0.16 with increasing mulch cover, from 0.43 to 0.29 with increasing sowing depth, and was higher for tetraploid than for diploid cultivars (0.44 v. 0.26, respectively). At the lower temperature the proportion of emerged seedlings declined from 0.85 to 0.20 with increasing mulch cover, from 0.62 to 0.39 with increasing sowing depth, and was higher for tetraploid than for diploid cultivars (0.63 v. 0.52, respectively). The ryegrass seedling study used treatment combinations of 3 temperature regimes (25/15°C, 20/10°C, or 15/5°C) × 2 seed types (tetraploid or diploid) × 5 harvest times (3, 4, 5, 6, and 8 weeks after sowing). At 8 weeks after sowing tetraploid top DM was significantly (P < 0.05) higher than diploid top DM at low (4100 v. 3040 mg/plant) and medium (5370 v. 2600 mg/plant), but not high (2460 v. 2780 mg/plant) temperatures. Tetraploid tiller and leaf numbers were substantially reduced by high temperature but not for diploid cultivars at 8 weeks. Tetraploid root DM at 8 weeks was highest (2360 mg/plant) and lowest (1200 mg/plant) at medium and low temperatures, respectively, while diploid root DM (mean = 1440 mg/plant) was not affected by temperature. Top growth was most rapid at 6–8 weeks (700–3392 mg/plant) and even more so for root growth (260–1617 mg/plant). These results indicate that when oversowing, ryegrass establishment will be most successful if the ryegrass seed is not sown below 3 cm but, more importantly, if the tropical grass residue is restricted to a 5 cm height. Further, sowing a tetraploid cultivar may be preferable to a diploid cultivar, with its superior emergence and seedling growth over a range of temperatures and sowing conditions.

Growth, development and yield of pigeon pea (Cajanus cajan (L.) Millsp.) in the lowland tropics: 4. Effect of sowing depth

1983 ◽  
Vol 101 (2) ◽  
pp. 435-440 ◽  
Author(s):  
T. O. Tayo
Keyword(s):  
Seedling Emergence ◽  
Pigeon Pea ◽  
Field Trials ◽  
Growth And Yield ◽  
Plant Establishment ◽  
Sowing Depth ◽  
Tropical Conditions ◽  
Pea Seeds ◽  
Growth Development ◽  
Better Than

SUMMARYThe seeds of a dwarf variety of pigeon pea (cv. Cita-1) were sown at 2, 4, 6 or 8 cm depths in three field trials in 1981 and 1982, in order to evaluate the effect of sowing depth on seedling emergence and the subsequent growth, development and yield of the crop.In all trials, sowing pigeon-pea seeds deeper than 4 cm led to 1–2 days delay in seedling emergence, resulted in only 40–68% seedling emergence, reduced the development of the various growth and yield characters of the plant and significantly reduced seed yield. In two trials, plants from 4 cm sowing performed better than those from 2cm sowing in terms of development of growth and yield characters indicating that shallow sowing of pigeon pea prevents rapid and proper plant establishment.The results therefore indicate that the optimum sowing depth for pigeon pea is 4 cm under the prevailing lowland humid tropical conditions.

scholarly journals Seed encrusting with salicylic acid: A novel approach to improve establishment of grass species in ecological restoration

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0242035
Author(s):  
Simone Pedrini ◽  
Jason C. Stevens ◽  
Kingsley W. Dixon
Keyword(s):  
Salicylic Acid ◽  
Seed Germination ◽  
Ecological Restoration ◽  
Seedling Survival ◽  
Seedling Emergence ◽  
Field Conditions ◽  
Grass Species ◽  
Seed Coating ◽  
Seedling Density ◽  
Survival And Growth

To achieve global ambitions in large scale ecological restoration, there is a need for approaches that improve the efficiency of seed-based interventions, particularly in overcoming the bottleneck in the transition from germination to seedling establishment. In this study, we tested a novel seed-based application of the plant stress modulator compound salicylic acid as a means to reduce seedling losses in the seed-to-seedling phase. Seed coating technology (encrusting) was developed as a precursor for optimising field sowing for three grass species commonly used in restoration programs, Austrostipa scabra, Microlaena stipoides, and Rytidosperma geniculatum. Salicylic acid (SA, 0.1mM) was delivered to seeds via imbibition and seed encrusting. The effects of SA on seed germination were examined under controlled water-limited conditions (drought resilience) in laboratory setting and on seed germination, seedling emergence, seedling growth and plant survival in field conditions. Salicylic acid did not impact germination under water stress in controlled laboratory conditions and did not affect seedling emergence in the field. However, seedling survival and growth were improved in plants grown from SA treated seeds (imbibed and encrusted) under field conditions. When SA delivery methods of imbibing and coating were compared, there was no significant difference in survival and growth, showing that seed coating has potential to deliver SA. Effect of intraspecific competition as a result of seedling density was also considered. Seedling survival over the dry summer season was more than double at low seedling density (40 plants/m2) compared to high seedling density (380 plants/m2). Overall, adjustment of seeding rate according to expected emergence combined with the use of salicylic acid via coating could improve seed use efficiency in seed-based restoration.

scholarly journals Beet Seedling Emergence in Function of Sowing Depth and System

2016 ◽  
Vol 15 (2) ◽  
pp. 215-221
Author(s):  
R.G.F. Morales ◽  
J.T.V. Resende ◽  
A.S.T. Figueiredo ◽  
A.G. Galvão ◽  
J.E. Baier ◽  
...  
Keyword(s):  
Seedling Emergence ◽  
Sowing Depth

scholarly journals Effects of Seed Coating with Differently Oxidized Iron on Seedling Emergence and Establishment after Direct-seeding under Submerged Conditions

2009 ◽  
Vol 78 (2) ◽  
pp. 242-249 ◽  
Author(s):  
Masami Furuhata ◽  
Tadashi Chosa ◽  
Osamu Matsumura ◽  
Tomoyuki Yukawa
Keyword(s):  
Seedling Emergence ◽  
Direct Seeding ◽  
Seed Coating ◽  
Oxidized Iron ◽  
Submerged Conditions

Modelling seed germination and seedling emergence of flax and sesame as affected by temperature, soil bulk density, and sowing depth

2019 ◽  
Vol 141 ◽  
pp. 111770 ◽  
Author(s):  
Hedayatollah Karimzadeh Soureshjani ◽  
Mahmoud Bahador ◽  
MahmoudReza Tadayon ◽  
Ayoub Ghorbani Dehkordi
Keyword(s):  
Seed Germination ◽  
Bulk Density ◽  
Seedling Emergence ◽  
Soil Bulk Density ◽  
Sowing Depth
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