scholarly journals Direct effects of soybean seed vigor on weed competition

2011 ◽  
Vol 33 (2) ◽  
pp. 346-351 ◽  
Author(s):  
Marcos Altomani Neves Dias ◽  
Tais Leite Ferreira Pinto ◽  
Vitor Henrique Vaz Mondo ◽  
Silvio Moure Cicero ◽  
Leticia Gomes Pedrini
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Soybean Seed ◽  
Dry Mass ◽  
Seed Vigor ◽  
Weed Competition ◽  
Direct Effects ◽  
Yield Data ◽  
Physiological Tests ◽  
Mass Accumulation

Seed vigor is one of the factors that determines the speed and uniformity of seedling emergence and initial plant growth, which are crucial aspects in the competition against weeds. The objective of this study was to verify the direct effects of soybean seed vigor on weed competition and grain yield. A field experiment was conducted with three seed lots of the "Conquista" cultivar, previously characterized by physiological tests as having high, intermediate and low vigor. The experiment was divided into weeded and unweeded plots with six treatments. Crop plant height, weed dry mass accumulation and crop grain yield data were recorded. Seed vigor did not affect plant height and grain yield. Plants which developed from seeds with high and intermediate vigor showed the best results for competition against weeds, reducing weed dry mass accumulation. Plants which developed from high vigor seeds give the best results for grain yield for both weeded and unweeded treatments.

scholarly journals Seedling length and soybean seed vigor

2021 ◽  
Vol 51 (7) ◽  
Author(s):  
Michele Renata Revers Meneguzzo ◽  
Géri Eduardo Meneghello ◽  
Ariele Paula Nadal ◽  
Fernanda da Mota Xavier ◽  
Simone Morgan Dellagostin ◽  
...  
Keyword(s):  
Seedling Growth ◽  
Soybean Seed ◽  
Dry Mass ◽  
Seed Vigor ◽  
Time Interval ◽  
Soybean Seedling ◽  
Randomized Design ◽  
Seedling Length ◽  
Completely Randomized Design ◽  
The Moment

ABSTRACT: The differentiation of seedling growth and development is the result of the vigor level of the seed lot. Because of this, knowing the seedling growth curve is essential for the evaluation of the seedling length test, to be carried out at the moment when any differences in vigor really manifest, thus being able to reduce the time of evaluation of the test. In this research, the objective was to determine the most efficient time interval to perform the seedling length test in soybean seeds, depending on the vigor levels. The evaluated characteristics were percentage of seed germination, first germination count, emergency, days for emergence, aerial, root and total length (evaluated every 12 hours), aerial, root and total dry mass in completely randomized design. High vigor seeds originated seedlings with higher growth rates (cm. h-1), with vigor being one of the factors that interfere in the seedling length test. After 96 hours of the seedling length test, there was a statistical differentiation between the three vigor levels tested. The soybean seedling length test between lots, with different vigor, can be performed 96 hours after sowing.

scholarly journals Dissecting and modelling the comparative adaptation to water limitation of sorghum and maize: role of transpiration efficiency, transpiration rate and height

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
E J van Oosterom ◽  
M R D L Kulathunga ◽  
K S Deifel ◽  
G B McLean ◽  
C Barrasso ◽  
...  
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Simulation Study ◽  
Transpiration Rate ◽  
Biomass Accumulation ◽  
Dry Mass ◽  
Transpiration Efficiency ◽  
Water Limitation ◽  
Drought Tolerant ◽  
Sorghum Genotypes

Abstract Maize is considered less drought-tolerant than sorghum, but sorghum is commonly grown as a short triple dwarf (3dwarf) type, so difference in plant height confounds the species comparison. The objectives of this study were to experimentally determine effects of species and plant height differences on transpiration efficiency (TE) and transpiration rate per unit green leaf area (TGLA) and use findings to explain input parameters in a simulation study on the comparative adaptation of 3dwarf sorghum and maize in environments with contrasting water availability. Maize, tall double dwarf (2dwarf) and short 3dwarf sorghum genotypes were grown in two lysimeter experiments in 2011 in SE Queensland, Australia. Each plant was harvested after anthesis and total transpiration, shoot and root dry mass were measured to estimate TE. Daily TGLA was used to compare transpiration rates. Species and height had limited effect on TE, but significantly affected TGLA. This was associated with differences in biomass allocation. The similar TE but higher TGLA in maize compared with 3dwarf sorghum meant it potentially produces more biomass, consistent with published differences in biomass accumulation and radiation use efficiency (RUE). The simulation study, which used similar TE for maize and 3dwarf sorghum, but captured differences in TGLA through differences in RUE, predicted crossover interactions for grain yield between species and total water use. The greater TGLA of maize decreased grain yield in water-limited environments, but increased yields in well-watered situations. Results highlight that similarity in TE and differences in TGLA can influence comparative adaptation to water limitation.

scholarly journals Effects of Rooting Volume Restriction on the Growth and Carbohydrate Concentration in Tomato Plants

1998 ◽  
Vol 123 (4) ◽  
pp. 581-585 ◽  
Author(s):  
Takashi Nishizawa ◽  
Kenji Saito
Keyword(s):  
Plant Height ◽  
Soluble Sugar ◽  
Dry Mass ◽  
Hydroponic Culture ◽  
Soil Culture ◽  
Tomato Plants ◽  
Shoot Ratio ◽  
Root To Shoot Ratio ◽  
Soluble Sugar And Starch ◽  
Mass Accumulation

Tomato plants (Lycopersicon esculentum Mill `Ougata-fukuju' and `Korokoro') were grown in a soil or a hydroponic culture to study effects of rooting volume restriction on plant growth and carbohydrate concentrations. In soil culture, leaf lengths decreased linearly as container volume decreased, while plant height did not decrease linearly, irrespective of fruiting. The root to shoot ratio decreased in smaller volume containers, irrespective of fruiting, because dry mass accumulation in the stem and leaves was relatively less inhibited than that in the roots. Total plant dry mass did not differ between fruiting and deblossomed plants, irrespective of container volume. In hydroponic culture, plant height in small containers (37 cm3) was similar to that in large containers (2024 or 4818 cm3). The root to shoot ratio of the plants grown in small containers was lower than that of the plants grown in large containers, mainly due to less inhibition of the dry mass accumulation in the stem than in the leaves. When small containers were almost filled with roots (28 days after transplanting), soluble sugar and starch concentrations in leaves became ≈2-fold higher in the plants grown in small than in those grown in large containers. At the end of experiment (42 days after transplanting), sucrose and starch concentrations in the stem were higher in plants grown in small than in those grown in large containers. However, soluble sugar and starch concentrations in the leaves did not differ between treatments.

scholarly journals IMPLANTATION SYSTEMS AND SURFACE IRRIGATION FOR MAIZE CROP IN LOWLAND AREAS

2020 ◽  
Vol 19 ◽  
pp. 10
Author(s):  
ELISA DE ALMEIDA GOLLO ◽  
ADROALDO DIAS ROBAINA ◽  
MARCIA XAVIER PEITER ◽  
ENIO MARCHESAN ◽  
ROBSON GIACOMELI ◽  
...  
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Plant Height ◽  
Dry Mass ◽  
Surface Irrigation ◽  
Maize Crop ◽  
Area Index ◽  
Productive Potential ◽  
Lowland Area

The raised seedbed implantation system and the use of surfaceirrigation can be important practices to enable rotation with rice and ensure the expression of the productive potential of maize in lowland areas. The purpose of this work was to evaluate the use of implantation systems and surface irrigation on agronomic characteristics and grain yield of maize crop in lowland areas. Two experiments were conducted in the experimental lowland area of the Federal University of Santa Maria – UFSM, during the 2014/15 crop season. The experiments consisted in the use of implantation systems with and without raised seedbeds and surface irrigation. The evaluated characteristics were plant height, shoot dry mass, leaf area index, yield components and grain yield. Plant height, leaf area index and shoot dry mass are higher when maize is grown in raised seedbeds in lowland areas. The raised seedbed system can be considered an efficient way to improve drainage in the cultivation area, resulting in a higher grain yield. The use of irrigation during periods of water deficit, in the critical period of crop growth, increases the grain yield of maize grown in lowland areas.

scholarly journals Seed vigor and amount of soybean straw on seedling emergence and productive performance of wheat

2017 ◽  
Vol 38 (4) ◽  
pp. 2179
Author(s):  
Julia Abati ◽  
Cristian Rafael Brzezinski ◽  
Claudemir Zucareli ◽  
Flávia Werner ◽  
Fernando Augusto Henning
Keyword(s):  
Grain Yield ◽  
Seedling Emergence ◽  
Dry Mass ◽  
Suppressive Effect ◽  
Seed Vigor ◽  
Productive Performance ◽  
Randomized Design ◽  
Shoot Number ◽  
Completely Randomized Design ◽  
Soybean Straw

The use of high-quality seeds is essential to minimize the possible suppressive effect of straw on seedling emergence, contributing to stand establishment and high grain yield. The aim of this study was to assess the influence of seed vigor associated with soil cover with different amounts of soybean straw on seedling emergence and productive performance of wheat. The experiment was conducted in a greenhouse using two wheat cultivars (CD 150 and BRS Gralha Azul) under a completely randomized design in a 2 × 5 factorial scheme with four replications. Factors consisted of two seed vigor levels (high and low) and five amounts of soybean straw (0, 3, 6, 9, and 12 t ha?1). The following assessments were performed: seedling emergence, dry mass of seedling shoot, number of tillers, plant height, yield components (number of spikes per plant, number of grains per spike, and mass of one thousand seeds), grain yield, and harvest index. The use of high vigor seeds favors the emergence and dry mass production of seedling shoot for both cultivars. The increased amount of soybean straw reduces seedling emergence in both cultivars. In the cultivars CD 150 and BRS Gralha Azul, the amounts of soybean straw of 2.45 and 5.40 t ha?1, respectively, result in a higher wheat grain yield.

scholarly journals AGRONOMIC PERFORMANCE OF CORN IN FUNCTION OF METHODS OF APPLICATION AND DOSES INOCULATED WITH Azospirillum brasilense

2020 ◽  
Vol 19 ◽  
pp. 16
Author(s):  
IVAN VILELA ANDRADE FIORINI ◽  
MAURÍCIO ESCOBAR TONIAL ◽  
CASSIANO SPAZIANI PEREIRA ◽  
DANIELE CRISTINA COSTA SABINO ◽  
IARA GARCÊS DIAS ◽  
...  
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Chlorophyll Content ◽  
Plant Height ◽  
Dry Mass ◽  
Leaf Nitrogen ◽  
Agronomic Performance ◽  
Application Methods ◽  
Bovine Gelatin ◽  
Plant Plant

Nitrogen supplementation becomes necessary when trying to increase yields of off-season corn crop grown in rotation with early-maturing soybean crop. Biological nitrogen fixation helps reduce the use of nitrogen fertilizers through the inoculation of nitrogen-fixing associative bacteria, such as those of the genus Azospirillum. This study aimed to evaluate the agronomic performance of corn hybrid DKB390Y in response to different application methods as the inoculant and doses of inoculant with Azospirillum brasiliense. The experiment was conducted in a property adjacent to Federal University of Mato Grosso (Sinop campus), between February and July 2018. The experimental design included randomized blocks in a 3×5 factorial arrangement, replicated four times, thereby totaling 60 plots (with three application methods: foliar spraying, spraying foliar with bovine gelatin, and with a paint roller [Black Decker Rapid Roller BDPR400-wool] and five doses of inoculant: 0, 100, 200, 400 and 800 mL ha-1). No differences in chlorophyll content at the bottom of the plant, plant height, and leaf area index were observed when varying the application methods. However, leaf nitrogen level, dry mass and grain yield changed when the application method used for inoculation changed. When evaluating doses, the control was found to be superior to the other treatments based on chlorophyll content at the bottom of the plant, plant height,leaf area, leaf nitrogen, and dry mass values. Grain yield was found to be superior with foliar inoculation at 100 mL ha-1 method foliar spray and 200 mL ha-1 methods foliar application with bovine gelatin.

scholarly journals Initial growth and agronomic performance of some important North American safflower cultivars

2019 ◽  
pp. 726-731
Author(s):  
Claudia Luiza Maziero ◽  
Reginaldo Ferreira Santos ◽  
Doglas Bassegio ◽  
Cristiano Fernando Lewandoski ◽  
Paulo de Lima Bueno ◽  
...  
Keyword(s):  
Grain Yield ◽  
Protein Content ◽  
Plant Height ◽  
North American ◽  
Oil Content ◽  
Dry Mass ◽  
Initial Growth ◽  
Agronomic Performance ◽  
Root Mass ◽  
Number Of Leaves

North American safflower cultivars can be considered as alternatives for cultivation in light of the limited improvement in the commercially grown and registered cultivars in Brazil. This study aimed to evaluate the initial growth and agronomic performance of North American safflower cultivars in Brazil. The experimental design for North American cultivars included random blocks with six cultivars (S-351, 3307, 8311, 0260, 0210 and S-323) and six replicates. The emergence percentage, emergence speed index, average emergence time, and average emergence speed were determined at 15 days after emergence (DAE). Plant height, stem diameter, number of leaves per plant, fresh plant mass, and dry plant mass were determined at 30 DAE. Plant height, stem diameter, number of branches, number of chapters, number of leaves, fresh plant mass, dry plant mass, fresh root mass, and dry root mass were determined at the flowering stage. The final plant density, number of chapters per plant, 100-grain weight, grain yield, oil content, and protein content were determined at the harvest stage. Cultivar S-351 had the greatest initial growth and exhibited greater emergence and emergence speed index. At 30 DAE, the cultivars did not differ with respect to the accumulation of dry mass and number of leaves. During flowering, cultivars S-323 and 8311 had greater accumulation of plant and root dry mass, as well as a greater number of leaves, branches, and chapters. Cultivars 210 and 260 had higher grain yield, whereas cultivars 3307 and S-323 had higher oil content, and cultivar S-351 had higher protein content.

scholarly journals Path analysis for morphological traits in maize (Zea mays L.)

Genetika ◽  
2015 ◽  
Vol 47 (1) ◽  
pp. 295-301 ◽  
Author(s):  
Jovan Pavlov ◽  
Nenad Delic ◽  
Ksenija Markovic ◽  
Milos Crevar ◽  
Zoran Camdzija ◽  
...  
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Indirect Effects ◽  
Morphological Traits ◽  
Path Coefficient ◽  
Direct Effects ◽  
Coefficient Corrélation ◽  
Number Of Leaves ◽  
Positive Direct ◽  
Positive Effect

Six inbred lines were crossed according to incomplete diallel method. In this way fifteen hybrid combinations were obtained. Hybrid combinations derived from these parental components were used in this work. The objective of study was to estimate direct and indirect effects of five morphological traits on grain yield by the application of the simple coefficient correlation and path coefficient analysis. The trait number of leaves above the top ear with the value of 0.736 has the strongest direct positive effect on grain yield. Positive direct effects on grain yield were also observed for height to tassel base and plant height, while negative direct effects were observed for ear height and total number of leaves. As far as indirect effects were considered, a positive effect of the ear position height on yield over the total plant height stands out. The evaluation of the proportion of mutual effects of five observed morphological traits on grain yield, expressed by the coefficient of multiple determination (R2y12345) amounted to 0.7881.

EFFECT OF SOWING DATE ON GRAIN YIELD OF CRAB GRASS

2001 ◽  
Vol 49 (3) ◽  
pp. 293-297
Author(s):  
S. O. Bakare ◽  
M. G. M. Kolo ◽  
J. A. Oladiran
Keyword(s):  
Grain Yield ◽  
Interaction Effect ◽  
Significant Interaction ◽  
Sowing Date ◽  
Yield Data ◽  
Significant Interaction Effect ◽  
Sowing Dates

There was a significant interaction effect between the variety and the sowing date for the number of productive tillers, indicating that the response to sowing date varied with the variety. A significant reduction in the number of productive tillers became evident when sowing was delayed till 26 June in the straggling variety as compared to sowing dates in May. Lower numbers of productive tillers were also recorded when the sowing of the erect variety was further delayed till 10 July. The grain yield data showed that it is not advisable to sow the straggling variety later than 12 June, while sowing may continue till about 26 June for the erect variety in the study area.

Utilizing Grain Yield Data from Wheat Demonstration Plots

1990 ◽  
Vol 19 (2) ◽  
pp. 164-166 ◽  
Author(s):  
Liu Ben-Hui ◽  
J. P. Shroyer ◽  
T. S. Cox
Keyword(s):  
Grain Yield ◽  
Yield Data
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