scholarly journals INFLUENCE OF MODIFIED LIGHT QUALITY ON DENDRANTHEMA GRANDIFLORA TZVELEV. GROWTH

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1144c-1144 ◽  
Author(s):  
Nihal C. Rajapakse ◽  
John W. Kelly
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Light Quality ◽  
Optical Filters ◽  
Ornamental Plant ◽  
Dry Matter Accumulation ◽  
Treatment Results ◽  
Specific Leaf Weight ◽  
Total Leaf Area ◽  
Sulfate Solutions

The use of light quality as an alternate method for controlling ornamental plant growth was evaluated using copper sulfate solutions as optical filters, The light passed through CuSO4 solutions had high red/far-red (R/FR) ratio. Plant height and average internode length were significantly reduced by high R/FR light. Plants grown under high R/FR light had smaller leaves and a lower total leaf area but had thicker leaves, as indicated by specific leaf weight, than the control plants. Fresh and dry weights of leaves, stems and roots were reduced by high R/FR light. Dry matter accumulation in leaves was increased by high R/FR light while it was reduced in stems. Exogenous gibberellic acid (GA) application partially overcame the height reduction under high R/FR light indicating that GA biosynthesis maybe affected by light treatment. Results suggests alteration of light quality could be used in controlling ornamental plant growth as an alternate method to conventional chemical growth regulator applications.

scholarly journals Photosynthetic activity of white lupine plants depending on growing technology and hydrothermal conditions

1970 ◽  
pp. 134-142
Author(s):  
A.V. Holodna ◽  
O.O. Stolyar ◽  
H.H. Remez
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Photosynthetic Activity ◽  
Leaf Surface ◽  
Growing Season ◽  
Dry Matter Accumulation ◽  
Biological Origin ◽  
Foliar Fertilization ◽  
Growth Stimulator ◽  
White Lupine

Purpose. Intensification of photosynthetic activity of white lupine plants in order to increase the grain yield by applying a fungicide, growth stimulator of plants of biological origin and foliar fertilization of crops with micronutrients in the critical periods of the growing season. Methods. Field (to study the interaction of the object of study with biotic and abiotic factors); morphophysiological (for biological control over the development of productivity elements by stages of organogenesis); weight (to establish the parameters of the crop structure elements and determine the yield of grain); statistical (statistical processing of the research results). Results. The results of the research on the influence of biological preparations, in particular fungicide and plant growth stimulator, as well as foliar feeding with microfertilizers in chelated form in different stages of organogenesis, on leaf surface formation and dry matter accumulation by the Chabansky variety white lupine plants are presented. Correlations have been established between the level of those indicators and the average daily air temperatures and the amount of precipitation during the growing season. Conclusions. To maximize the genetic potential of the Chaban lupine variety, the technology of its cultivation should include sowing seeds treated with bioinoculant in combination with a bioprotector, application of a biostimulator of plant growth and development and foliar fertilization of plants with microfertilizer at the second stage of organogenesis. Formation of the leaf surface of white lupine plants and their accumulation of dry matter are significantly influenced by weather conditions during April-July.

Growth of lentil (Lens culinaris Medikus) as influenced by phosphorus, Rhizobium and plant growth promoting rhizobacteria

2016 ◽  
Author(s):  
Guriqbal Singh ◽  
Narinder Singh ◽  
Veena Khanna
Keyword(s):  
Plant Growth ◽  
Grain Yield ◽  
Plant Height ◽  
Dry Matter ◽  
Block Design ◽  
Plant Growth Promoting Rhizobacteria ◽  
Dry Matter Accumulation ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Phosphorus Application

The experiment was conducted to study the effect of four levels of phosphorus (0, 20, 30 and 40 kg P2O5 ha-1) and four biofertilizer treatments [uninoculated control, Rhizobium, plant growth promoting rhizobacteria (PGPR) and Rhizobium + PGPR] on growth and grain yield of lentil. The experiment was conducted in factorial randomized complete block design (RCBD) with three replications. The periodic data recorded at 30, 60, 90, 120 days after sowing (DAS) and at harvest showed that the highest growth in various parameters i.e. plant height, branches plant-1 and shoot dry matter accumulation was recorded with application of 40 kg P2O5 ha-1, however, it was at par with 30 P2O5 ha-1. Among the biofertilizers, Rhizobium + PGPR treatment gave maximum values of growth parameters like plant height, branches plant-1 and shoot dry matter accumulation at all the stages. At 30-60 DAS, the maximum crop growth rate (CGR) was recorded with the application of 40 kg P2O5 ha-1 (71.3 kg ha-1 day-1) and co-inoculation of Rhizobium and PGPR (72.0 kg ha-1 day-1). Application of 40 P2O5 ha-1 and use of coinoculation (Rhizobium + PGPR) provided the highest grain yields. The study highlights the importance of phosphorus application and biofertilizers inoculation for improving the growth and grain yield of lentil.

scholarly journals Using Light Quality for Growth Control of Cucumber Seedlings in Closed-Type Plant Production System

Plants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 639 ◽  
Author(s):  
Hyeon Woo Jeong ◽  
Hye Ri Lee ◽  
Hyeon Min Kim ◽  
Hye Min Kim ◽  
Hee Sung Hwang ◽  
...  
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Light Quality ◽  
Stem Elongation ◽  
Leaf Shape ◽  
Growth Control ◽  
Shape Index ◽  
Chemical Plant ◽  
Plant Production ◽  
Closed Type

During seedling production, growth control of seedlings is an important problem because the overgrowth of seedlings causes a decrease of seedling quality and has disadvantages after transplanting. In this study, we aim to evaluate the possibility of replacing chemical plant growth regulators using light quality in a closed-type plant production system (CPPS) for cucumber seedling production. We used various light treatments, such as monochromatic or combined red (R) and blue (B), and combined R and B with UV-A or Far-red (Fr) light, to compare with a chemical plant growth regulator conventionally using in nursery farms. The combined R and B treatment decreased stem elongation and increased dry matter and compactness. UV-A treatment increased compactness but did not significantly affect the stem elongation or dry matter. Fr increased stem elongation and stem diameter and decreased compactness and dry matter. In leaf growth, combined R and B treatments and UV-A treatments increased leaf area, specific leaf weight, and SPAD value, and decreased leaf shape index. Fr treatments increased leaf area and leaf shape index and decreased specific leaf weight (SLW) and SPAD values. Cucumber seedlings have many different morphological changes, and R5B5 light quality was more effective in growth control due to higher compactness than chemical plant growth regulators. Also, R5B5 light quality has increased seedling quality, such as dry matter and SLW compared with fluorescent lamps. Thus, the use of light quality is a possible alternative to a chemical plant growth regulator.

scholarly journals Effects of growth regulator and nitrogen on yield and lodging of irrigated wheat

2016 ◽  
Vol 37 (4) ◽  
pp. 1709
Author(s):  
Pedro Henrique Marques Paula Nunes ◽  
Leonardo Angelo de Aquino ◽  
Felipe Oliveira Xavier ◽  
Luiz Paulo Dornelas dos Santos ◽  
Lucas Gonçalves Machado ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Growth Regulator ◽  
Dry Matter ◽  
N Uptake ◽  
Growth And Yield ◽  
Dry Matter Accumulation ◽  
Matter Production ◽  
Irrigated Wheat ◽  
Leaf N Content

High rates of nitrogen (N) increase plant growth, which can result in lodging. To avoid excessive growth of plants, plant growth regulators (PGRs), which cause internode length reduction, can be used. In this study, our objective was to evaluate the N nutritional status, growth, and yield of irrigated wheat as parameters using variable rates of nitrogen and growth regulator. Two experiments were conducted in Rio Paranaíba – MG in 2011 and 2012 using the BRS 264 cultivar. The treatments consisted of two concentrations of N (50 and 110 kg ha-1 as urea) and five concentrations of the growth regulator trinexapac-ethyl (0, 0.2, 0.4, 0.6, and 0.8 L ha-1 of Moddus® containing 25% w/v of trinexapac-ethyl). Each plot consisted of 20 rows of wheat spaced 0.17 m, six meters in length. We evaluated plant height, shoot dry matter accumulation, thousand-grain weight, number of grains per spike, yield, leaf N content in the index leaf and grain, amount of N uptake and export, and lodging index. The PGR resulted in a linear decrease in plant height and shoot dry matter production. However, the rates of the growth regulator did not affect productivity. The rates of N influenced the yield only in 2011.

scholarly journals Plant growth and dynamics of green mass and dry matter accumulation in crop rotations and monocrops on irrigation

2020 ◽  
Vol 0 (117) ◽  
pp. 158-163
Author(s):  
Sh. H. Ahmedov ◽  
M. Y. Rzayev ◽  
P. M. Mammadova ◽  
Z. M. Abdullayeva
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Crop Rotations ◽  
Dry Matter Accumulation ◽  
Green Mass

Plant Growth of Processing Tomato （Solanum lycopersicum) Subjected to Water Deficit Regulated with Mulched Drip Irrigation

2013 ◽  
Vol 838-841 ◽  
pp. 2366-2369 ◽  
Author(s):  
Ai Cun Wen ◽  
Heng Jia Zhang
Keyword(s):  
Plant Growth ◽  
Water Deficit ◽  
Drip Irrigation ◽  
Dry Matter ◽  
Growth Stages ◽  
Dry Matter Accumulation ◽  
Area Index ◽  
Processing Tomato ◽  
Effect Of Water ◽  
Mulched Drip Irrigation

An experiment was carried out to determine the effect of water deficit regulated with mulched drip irrigation on plant growth of processing tomato in an arid environment. The results indicated that Water deficit had little effect on plant height of processing tomato at full fruiting and late fruiting except that at seedling and flowering. Still, no effect of water deficit regulation on stem diameter was found at all measured growth stages. However, leaf area index and dry matter was significantly (p<0.05) reduced at all growth stages of tomato subjected to high water deficit at seedling. Therefore, low level of water deficit at seedling while free of deficit from flowering to late fruiting as well as proper levels of water deficit at flowering or full fruiting or late fruiting while free of deficit at seedling could be used to effectively regulate leaf growth and dry matter accumulation of processing tomato in arid areas.

scholarly journals Physiological characterization of plant growth in sweet potato

2019 ◽  
Vol 37 (1) ◽  
pp. 112-118
Author(s):  
Marcos Aurélio M Ferreira ◽  
Valter C Andrade Junior ◽  
Altino JM Oliveira ◽  
Evander A Ferreira ◽  
Orlando G Brito ◽  
...  
Keyword(s):  
Plant Growth ◽  
Sweet Potato ◽  
Dry Matter ◽  
Calculated Data ◽  
Dry Matter Accumulation ◽  
Harvest Time ◽  
Sweet Potatoes ◽  
Physiological Characterization ◽  
Physiological Indexes

ABSTRACT This research was installed to study plant growth of sweet potato and identify the most favorable harvest time for both roots and the aboveground part (stems). The experiment was carried out at the JK campus of the Federal University of the Vale do Jequitinhonha e Mucuri, in Diamantina, MG, complete blocks at random, with four replications. Three plants in the central part of the experimental plots were collected in twelve consecutive harvests at 15-day intervals. Plants were fractionated in roots, stems, and leaves to determine the dry matter of each part. Leaf area was also measured and growth rates were calculated. Data were analyzed by means of regression. Plants reached the highest dry matter accumulation between 75 and 156 days after transplanting (DAT), which corresponded to the phase of greatest growth. Plants should be harvested between 60 and 87 DAT to achieve the highest stem yield. For the highest root yield, the harvest should be carried out 180 DAT. The period from 80 to 118 DAT was the most adequate for reaching simultaneously the highest yields for both roots and stems. Therefore, the ideal harvest time for sweet potatoes depends on the use intended for the plant and on the physiological indexes associated with it.

RESPONSE OF SOYBEANS TO TEMPERATURE UNDER HIGH LIGHT INTENSITIES

1972 ◽  
Vol 52 (4) ◽  
pp. 535-543 ◽  
Author(s):  
G. HOFSTRA
Keyword(s):  
Low Temperatures ◽  
Dry Matter ◽  
Stem Elongation ◽  
High Light ◽  
Dry Matter Accumulation ◽  
Growth Responses ◽  
Specific Leaf Weight ◽  
Differential Growth ◽  
Light Intensities ◽  
Temperature Regimes

Differential growth responses were observed for soybeans subjected to day temperatures from 18 to 36 C under controlled greenhouse conditions at high light intensities. Leaf area production reached a maximum at 27–30 C, whereas maximum dry matter accumulation was obtained at 36 C. Specific leaf weight varied with temperature and was greatest at the high and low temperature regimes. Stem elongation was greatest at 36 C, and axillary growth was most evident at low temperatures. Except at the very early stages, about 50% of the dry matter accumulation occurred in the leaf blades, irrespective of the temperature.

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