Vernalization Requirements for Flowering of Jointed Goatgrass (Aegilops cylindrica)

Weed Science ◽  
1984 ◽  
Vol 32 (5) ◽  
pp. 631-637 ◽  
Author(s):  
William W. Donald
Keyword(s):  
Dry Matter ◽  
Cold Treatment ◽  
Dry Weight ◽  
Field Studies ◽  
Vegetative Shoot ◽  
Aegilops Cylindrica ◽  
Shoot Dry Weight ◽  
Jointed Goatgrass ◽  
Matter Production ◽  
Growing Conditions

Jointed goatgrass (Aegilops cylindrica Host. ♯3 AEGCY) has a quantitative requirement for vernalization in order to flower. In greenhouse and field studies, increasing periods of vernalization progressively reduced the number of days needed for plants to mature following transfer from the cold treatment to favorable growing conditions. Plants that had been vernalized at 3 ± 2 C for 8 weeks as imbibed seed took 120 days to flower following transfer to the greenhouse. Unvernalized controls flowered 197 to 222 days after planting in the greenhouse. Lengthening periods of vernalization from 2 to 8 weeks increased the number of seedheads per plant and dry weight per seedhead. Vernalized plants partitioned more dry matter into seedheads than unvernalized controls. The ratio of seedhead dry weight to vegetative shoot dry weight increased with duration of vernalization, even though vernalization did not alter total shoot dry-matter production. In field studies, plants that were established in the fall flowered sooner and more synchronously after resumption of growth in the spring than those that were planted in the spring and flowered in the summer. Plants seeded after May failed to flower in the same summer.

Effects of Vernalization on Flowering in Ripgut Brome (Bromus diandrus)

Weed Science ◽  
1996 ◽  
Vol 44 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Jean A. Gleichsner ◽  
Arnold P. Appleby
Keyword(s):  
Cold Treatment ◽  
Dry Weight ◽  
Field Studies ◽  
Vegetative Shoot ◽  
Vegetative Period ◽  
Bromus Diandrus ◽  
Shoot Dry Weight ◽  
Time Required ◽  
Total Seed ◽  
Quantitative Response

Ripgut brome has a quantitative response to vernalization in relation to flowering. In greenhouse studies, cold treatment (5 ± 2 C) of 2, 4, or 6 wk shortened the vegetative period, but longer exposure did not further decrease the time required to flower. Plants vernalized as imbibed seeds for 8 wk took 17 d to flower following transfer from cold treatment to the greenhouse. Unvernalized controls flowered 53 d after planting in the greenhouse. Greatest total seed dry weight and vegetative shoot dry weight were produced by unvernalized plants, whereas lengthening periods of vernalization from 2 to 8 wk decreased both parameters. The percent of total seed dry weight to total shoot dry weight was significantly greater for vernalized plants than unvernalized controls. In field studies, ripgut brome plants established in the fall flowered sooner after resumption of growth in the spring than those planted in the spring. Plants seeded after April failed to flower until the following spring.

Effect of Herbicides on Germination and Growth of Four Grass Weeds

Weed Science ◽  
1984 ◽  
Vol 32 (4) ◽  
pp. 489-493 ◽  
Author(s):  
Frank L. Young ◽  
David R. Gealy ◽  
Larry A. Morrow
Keyword(s):  
Bromus Tectorum ◽  
Soil Surface ◽  
Dry Weight ◽  
Shoot Elongation ◽  
Downy Brome ◽  
Aegilops Cylindrica ◽  
Shoot Height ◽  
Shoot Dry Weight ◽  
Jointed Goatgrass ◽  
Germination And Growth

In the greenhouse, glyphosate [N-(phosphonomethyl)glycine] at 0.6 kg ae/ha applied directly to seeds alone or seeds on the soil surface reduced germination and shoot dry weight of common rye (Secale cerealeL. ♯3SECCE). Paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) applied similarly at 0.6 kg ai/ha reduced germination and shoot dry weight of downy brome (Bromus tectorumL. ♯ BROTE) and wheat (Triticum aestivumL. ‘Daws' ♯ TRZAX). Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5 (4H)-one] at 0.6 kg ai/ha applied to seeds, soil, or seeds and soil had very little effect on germination, but significantly reduced shoot dry weight of common rye, downy brome, wheat, and jointed goatgrass (Aegilops cylindricaHost. ♯ AEGCY). Pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide] at 0.6 kg ai/ha, and propham (isopropyl carbanilate) at 3.4 kg ai/ha plus extender (p-chlorophenyl-N-methylcarbamate) at 0.4 kg ai/ha substantially reduced shoot height and dry weight of all species, regardless of application method, with pronamide completely inhibiting shoot elongation and dry-weight production in three of the four species.

scholarly journals Effects of nitrogen fertilizer and elevated CO2 on dry matter production and yield of rice cultivars

1970 ◽  
Vol 34 (2) ◽  
pp. 313-322 ◽  
Author(s):  
MA Razzaque ◽  
MM Haque ◽  
MA Hamid ◽  
QA Khaliq ◽  
ARM Solaiman
Keyword(s):  
Elevated Co2 ◽  
Field Condition ◽  
Dry Matter ◽  
Dry Weight ◽  
Dry Matter Production ◽  
Optimum Dose ◽  
Rice Cultivars ◽  
Nitrogen Levels ◽  
Matter Production ◽  
Growing Conditions

A pot experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during the year 2003 to find out the dry matter production and yield of rice cultivars under different nitrogen levels and growing conditions. Thirty-day old single seedlings were transplanted in pot and were placed in 3 growing conditions, such as i) Open top chamber (OTC) with elevated CO2 (570 ± 50 ppm), ii) OTC with ambient CO2 (360 ± 50 ppm), and iii) open field condition. The three nitrogen levels used were, i) control, ii) optimum dose, and iii) supra optimum dose. Three rice cultivars used in the experiment were, i) BRRI dhan 39, ii) Khashkani, and iii) Shakkarkhora. Rice yield and dry matter production respond significantly to different environments. Increasing atmospheric CO2 increased grain yield. Stem dry weight, leaf dry weight, leaf sheath dry weight and root dry weight were increased in elevated CO2 than ambient CO2 and field condition. BRRI dhan 39 gave highest yield (50.82 g/plant) at supra optimum N level in elevated CO2. Local variety gave similar result under elevated CO2 in optimum and supra optimum N levels. The lowest yield (15.09 g/plant) was produced by Shakkorkhora in field condition with no nitrogen application. Key Words: Nitrogen; elevated CO2; yield; dry matter.DOI: 10.3329/bjar.v34i2.5804Bangladesh J. Agril. Res. 34(2): 313-322, June 2009

scholarly journals Effect of Bradyrhizobium Inoculation on Nodulation, Biomass Production and Yield of Mungbean

1970 ◽  
Vol 24 (2) ◽  
pp. 95-99
Author(s):  
M Asadul Haque Bhuiyan ◽  
Mosharraf Hossain Mian
Keyword(s):  
Biomass Production ◽  
Seed Yield ◽  
Dry Matter ◽  
Dry Weight ◽  
Nodule Number ◽  
Shoot Dry Weight ◽  
Seed Inoculation ◽  
Matter Production ◽  
Stover Yield ◽  
Shoot Weight

Experiments with or without Bradyrhizobium was carried out with five mungbean varieties at Bangladesh Agricultural University Farm during kharif-I 2001 and kharif-I 2002 seasons to observe nodulation, biomass production and yield of mungbean. Significant influences of the mungbean varieties were observed on nodulation, biomass production and yield. BARI Mung-2 produced the highest nodule number, nodule weight, shoot weight, seed yield (1.03 t/ha in 2001 and 0.78 t/ha in 2002) and stover yield (2.24 t/ha in 2001 and 2.01 t/ha in 2002). Application of Bradyrhizobium inoculant produced significant effect on nodulation, shoot dry weight, seed and stover yields in both trials conducted in two consecutive years. Seed inoculation significantly increased seed (0.98 t/ha in 2001, 27% increase over control and 0.75 t/ha in 2002, 29% increase over control) and stover (2.31 t/ha in 2001 and 2.04 t/ha in 2002) yields of mungbean. Inoculated BARI Mung-2 produced the highest nodulation, dry matter production, seed and stover yields. Considering nodulation, biomass production and seed and yields, BARI Mung-2 was found as the best variety among the five. BARI Mung-5 produced the second highest seed yield followed by BARI Mung-4 and BINA Mung-2, and the lowest seed yield was observed in Barisal local. Keywords: Mungbean, Nodulation, Bradyrhizobium DOI: http://dx.doi.org/10.3329/bjm.v24i2.1251 Bangladesh J Microbiol, Volume 24, Number 2, December 2007, pp 95-99

Grain yield and flowering of some introduced grain legumes in South Australia

1975 ◽  
Vol 15 (75) ◽  
pp. 556 ◽  
Author(s):  
JH Silsbury
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
South Australia ◽  
Dry Weight ◽  
Grain Legumes ◽  
The Other ◽  
Shoot Dry Weight ◽  
Matter Production ◽  
Lathyrus Cicera ◽  
Genotype A

Data are presented for time of flowering, total shoot dry weight and grain yield of White Brunswick pea (Pisum sativum), six introduced peas and one introduction each of Lathyrus sativus and Lathyrus cicera from ten plot experiments conducted in South Australia over the period 1955-1 960.None of the introduced legumes flowered earlier than White Brunswick peas and only one, possibly, has a greater capacity for higher grain yield. L. cicera on the other hand gave 25 per cent greater yield over all sites and seasons with an average of 2.84 tonne ha-1.The ratio between grain yield and total shoot dry weight varied with genotype and between seasons with a genotype. A low ratio was not always associated with low dry matter production.

Increased Kernel Number in Norin 10-Derived Dwarf Wheat: Evaluation of the Cause

1986 ◽  
Vol 13 (6) ◽  
pp. 767 ◽  
Author(s):  
RA Fischer ◽  
YM Stockman
Keyword(s):  
Spring Wheat ◽  
Dry Matter ◽  
Dry Weight ◽  
Field Studies ◽  
Water Soluble ◽  
Growth Potential ◽  
Soluble Carbohydrate ◽  
Floral Initiation ◽  
Kernel Number ◽  
Shoot Dry Weight

This study of the effect of major Norin 10 dwarfing genes (Rht1, Rht2) on kernel number in spring wheat emphasised three near-isogenic pairs of spring wheat, differing in the presence or absence of both genes. Plants were grown under controlled environment conditions with equal light intensities at their tops and were restricted to main stems by repeated tiller trimming. The dwarf wheats had a higher proportion of shoot dry weight in the spike at anthesis, an effect which field studies suggest is closely associated with their production of more kernels per unit land area. Stems of dwarf genotypes were somewhat shorter as early as 50 days before anthesis (i.e. before floral initiation) but relative differences became especially great commencing at 35 days before anthesis. Apex and spike lengths were never very different. A greater proportion of dry matter was distributed to leaf lamina from 50 days before anthesis until the end of lamina growth in dwarf wheats, while partitioning to stems was lower from 50 days before anthesis onwards. Partitioning to spikes was only higher in the 15 days preceding anthesis. Stem water-soluble carbohydrate (WSC) contents at anthesis were greater in dwarf wheats but maximum spike WSC contents reached at about 15 days before anthesis were lower. Spike morphogenesis including floret production and grain setting did not differ generally, except for a tendency with dwarf wheats for a longer floral initiation to anthesis interval and for more kernels per unit of spike weight at anthesis. The major unique feature of dwarf genotypes, the higher proportion of dry matter partitioned to the spike, appeared to be due to reduced competition from growing stems in dwarf wheats rather than intrinsic differences in the growth potential of their spikes.

scholarly journals Evaluation of morphological characteristics in Venezuelan maize (Zea mays L.) genotypes under drought stress

1994 ◽  
Vol 51 (3) ◽  
pp. 453-458 ◽  
Author(s):  
R.G. Camacho ◽  
D.F. Caraballo
Keyword(s):  
Zea Mays ◽  
Drought Stress ◽  
Dry Matter ◽  
Zea Mays L ◽  
Morphological Characteristics ◽  
Dry Weight ◽  
The Other ◽  
Root Volume ◽  
Shoot Dry Weight ◽  
Matter Production

A greenhouse experiment was carried out to evaluate the responses among 10 maize (Zea mays L.) genotypes under drought stress. Seeds were planted in washed sand in plastic pots. The research was established in a completely random design with ten treatments and three replicate pots. The plants were harvested four weeks after sowning, and leaf area per plant (LA), root volume (RV), longest root length (LRL), plant height (PH), fresh (RFW) and dry weight (ROW) of roots, shoot dry weight (SOW), RDW/SDW ratio, and total dry matter production (TDM) were determined. Significant varietal differences for all characters were found, except for LRL. The data obtained allowed to identify Cargill-163 as a poor genotype at low water supply. Danac-3006, FM-6, Sefloarca-91, Ceniap PB-8, and Tocorón-300 hybrids showed the best behaviour in terms of RDW/SDW ratio and root volume. On the other hand, root dry weight was identified as the best indicator and easiest characteristic to determine the drought-tolerance of maize plant.

scholarly journals EFFECT OF MINERAL DEFICIENCY ON MORPHOLOGICAL AND PHYSIOLOGICAL PARAMETERS AND ON SHOOT AND ROOT MINERAL PARTITIONING IN THREE SUNFLOWER VARIETIES / EFECTO DE LA FALTA DE ELEMENTOS MINERALAS SOBRE LOS PARAMENTROS MORFOLOGICOS Y FISIOLOGICOS Y REPARTICION DE ELEMENTOS MINERALES DE LA PARTE SOBRE EL SUELO Y DE LA RAIZ EN TRES VARIEDADES / INFLUENCE DE LA CARENCE D’ÉLÉMENTS MINÉRAUX SUR LES PARAMÈTRES MORPHOLOGIQUES ET PHYSIOLOGIQUES ET SUR LA DISTRIBUTION DES ÉLÉMENTS MINÉRAUX ENTRE LA PARTIE AÉRIENNE ET LA RACINE POUR TROIS SORTES DE TOURNESOL

Helia ◽  
2001 ◽  
Vol 24 (35) ◽  
pp. 135-148
Author(s):  
Mohammed El Midaoui ◽  
Ahmed Talouizte ◽  
Benbella Mohamed ◽  
Serieys Hervé ◽  
Ait Houssa Abdelhadi ◽  
...  
Keyword(s):  
Leaf Area ◽  
Dry Matter ◽  
Growth Parameters ◽  
Dry Weight ◽  
Mineral Deficiency ◽  
P Deficiency ◽  
Plant Parts ◽  
Shoot Dry Weight ◽  
K Deficiency ◽  
Matter Effect

SUMMARYAn experiment has been carried out in order to study the behaviour under mineral deficiency of three sunflower genotypes, a population variety (Oro 9) and two hybrids (Mirasol and Albena). Sunflower seedlings were submitted to five treatments: N deficiency (N0), P deficiency (P0), K deficiency (K0), N and K deficiency (N0K0) and a control. Plants were harvested when they reached 3-4 true pairs of leaves. Growth parameters measured (height, total leaf area, root length, root and shoot dry mater) were all significantly reduced by mineral deficiency. Leaf area was most reduced by N0 (-61%) and P0 (-56%). Total dry matter was most affected by N0 (-63%) and by N0K0 (-66%). Genotype comparisons showed that Oro 9 had the highest shoot dry matter while Albena had the lowest root dry matter. Effect of mineral deficiency on content and partitioning of N, P, K, Ca and Na was significant and varied according to treatments and among plant parts. Shoot dry weight was significantly correlated with root N content (r2=0.81) and root K content (r2=-0.61) for N0 and K0.

Effects of Temperature and CO2Concentration on the Growth of Cotton (Gossypium hirsutum), Spurred Anoda (Anoda cristata), and Velvetleaf (Abutilon theophrasti)

Weed Science ◽  
1988 ◽  
Vol 36 (6) ◽  
pp. 751-757 ◽  
Author(s):  
David T. Patterson ◽  
Maxine T. Highsmith ◽  
Elizabeth P. Flint
Keyword(s):  
Dry Matter ◽  
Dry Weight ◽  
Net Assimilation Rate ◽  
Assimilation Rate ◽  
Short Term ◽  
Leaf Weight ◽  
Matter Production ◽  
Total Plant ◽  
Net Assimilation ◽  
Total Dry Weight

Cotton, spurred anoda, and velvetleaf were grown in controlled-environment chambers at day/night temperatures of 32/23 or 26/17 C and CO2concentrations of 350 or 700 ppm. After 5 weeks, CO2enrichment to 700 ppm increased dry matter accumulation by 38, 26, and 29% in cotton, spurred anoda, and velvetleaf, respectively, at 26/17 C and by 61, 41, and 29% at 32/23 C. Increases in leaf weight accounted for over 80% of the increase in total plant weight in cotton and spurred anoda in both temperature regimes. Leaf area was not increased by CO2enrichment. The observed increases in dry matter production with CO2enrichment were caused by increased net assimilation rate. In a second experiment, plants were grown at 350 ppm CO2and 29/23 C day/night for 17 days before exposure to 700 ppm CO2at 26/17 C for 1 week. Short-term exposure to high CO2significantly increased net assimilation rate, dry matter production, total dry weight, leaf dry weight, and specific leaf weight in comparison with plants maintained at 350 ppm CO2at 26/17 C. Increases in leaf weight in response to short-term CO2enrichment accounted for 100, 87, and 68% of the observed increase in total plant dry weight of cotton, spurred anoda, and velvetleaf, respectively. Comparisons among the species showed that CO2enrichment decreased the weed/crop ratio for total dry weight, possibly indicating a potential competitive advantage for cotton under elevated CO2, even at suboptimum temperatures.

scholarly journals HUMIC SUBSTANCES AND PHOSPHOROUS SOURCES IN MAIZE CROPS

Nativa ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 371
Author(s):  
Lucas Morais Lôbo ◽  
Eva De Melo Ferreira ◽  
Camilla Oliveira Muniz ◽  
Carlos Alberto Da Silva Ferreira ◽  
Eliana Paula Fernandes Brasil
Keyword(s):  
Humic Substances ◽  
Dry Matter ◽  
Dry Weight ◽  
Agronomic Efficiency ◽  
Shoot Dry Weight ◽  
P Accumulation ◽  
Phosphorus Sources ◽  
Maize Plants ◽  
Best Responses ◽  
P Sources

SUBSTÂNCIAS HÚMICAS E FONTES DE FÓSFORO NA CULTURA DO MILHO O objetivo do estudo é verificar o efeito da adição de doses de um produto comercial a base de substâncias húmicas (SH), na produção de massa seca de plantas de milho, no acúmulo de P nas plantas e a eficiência agronômica de fontes de fósforo em dois tipos de solos com diferentes capacidades de adsorção. O trabalho foi conduzido em casa de vegetação. Os tratamentos compreendem quatro doses de substâncias húmicas (0, 100, 200 e 400 kg ha-1) e duas fontes de fósforo (superfosfato triplo – SFT e fosfato natural reativo – FNR), em dois tipos de solos (Latossolo Vermelho – LV e Neossolo Quartzarênico – NQ). As fontes de P foram fornecidas em dose constante de 75 mg.dm-3 de P. Houve resposta estatisticamente significativa (P<0,05) da produção de massa seca da parte aérea (MSPA), massa seca das raízes (MSR), P acumulado na parte aérea e P acumulado nas raízes à adição de SH. No LV os parâmetros MSPA, MSR, P acumulado na parte aérea, P acumulado nas raízes e a Eficiência agronômica relativa das fontes de P aumentaram com a adição crescente de SH, obtendo os melhores resultados com uso da maior dose (400 kg ha-1). No NQ as melhores respostas foram obtidas com a adição de 100 kg ha-1 da SH. Estes resultados indicam que a utilização de substâncias húmicas é eficiente para o aumento da produção de massa seca das plantas de milho e no teor de P acumulado.Palavras-chave: P acumulado, eficiência agronômica relativa, adsorção de fósforo. ABSTRACT: The objective of this study was to verify the effect of the application of different rates of a commercial product based on humic substances (HS) on the dry matter contents, and P accumulation in maize plants and the agronomic efficiency of phosphorus sources in two soils with different adsorption capacities. The experiment was conducted in a greenhouse. The treatments consisted of four rates of humic substances (0, 100, 200, and 400 kg ha-1) and two phosphorus sources (triple superphosphate – TSP; and reactive natural phosphate – RNP) in two types of soils (Rhodic Hapludox – RH; and Typic Quartzipsamment – TQ). The response of the shoot dry weight (SDW), root dry weight (RDW), shoot accumulated P, and root accumulated P to the application of HS was statistically significant (P <0.05). In the RH, the SDW, RDW, shoot and root accumulated P, and relative agronomic efficiency of the P sources increased with increasing HS rates; thus, the best results were found with the use of the highest rate (400 kg ha-1). In the TQ, the best responses were found with the application of 100 kg ha-1 of HS. These results indicate that the use of humic substances is efficient to increase dry matter and accumulated P contents in maize plants.Keywords: accumulated P, relative agronomic efficiency, P adsorption.

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