INTERACTION OFCULTIVAR, SOWING DATE AND SOWING RATE ON LODGING, YIELD AND SEED WEIGHT OF BUCKWHEAT

1977 ◽  
Vol 57 (2) ◽  
pp. 317-321 ◽  
Author(s):  
G. H. GUBBELS
Keyword(s):  
Seed Weight ◽  
Sowing Date ◽  
Fagopyrum Esculentum ◽  
The Third ◽  
Sowing Dates ◽  
Fagopyrum Esculentum Moench

Two buckwheat (Fagopyrum esculentum Moench.) cultivars, Tokyo and Tempest, were grown in 1971, 1972 and 1973 at 8.5, 17, 34 and 68 kg/ha sowing rates and at early, mid- and late June sowing dates. Tempest lodged more than Tokyo, particularly in 1971. Yield generally declined with each delay in sowing. In 1971, yield increased with each increase in sowing rate, while in 1972 there was no difference due to rate. In 1973, yield increased to the third rate and levelled out to the fourth. Therefore, a sowing rate of over 34 kg/ha may be required to assure good yields each year. Seed weight tended to decrease with delay in sowing but was not affected by sowing rate.

Variation in branch length in Fagopyrum esculentum in response to density and emergence date: No evidence for true plasticity

Botany ◽  
2009 ◽  
Vol 87 (9) ◽  
pp. 888-892 ◽  
Author(s):  
Wisdom Japhet ◽  
Daowei Zhou ◽  
Ping Wang
Keyword(s):  
Branch Length ◽  
Sowing Date ◽  
Fagopyrum Esculentum ◽  
Planting Density ◽  
Total Biomass ◽  
Heterogeneous Environments ◽  
Sowing Dates ◽  
Allometric Analysis ◽  
Fagopyrum Esculentum Moench ◽  
Emergence Date

Plasticity is an important attribute that enables plants to maintain fitness in heterogeneous environments. The objective of this study was to investigate plasticity in branch length in Fagopyrum esculentum Moench. Seeds of the species were sown under two contrasting conditions through the manipulation of planting density (inter-planting distances at 20, 15, 10, and 5 cm) and sowing date (25 July, 1 August, 5 August, and 15 August). Allometric analysis of the relationships between branch length and total biomass showed a significant (p < 0.05) departure from isometry. This indicates that branch length increased linearly as a function of size. However, branch length was smaller in the group of plants sown at higher densities and at late sowing dates. True plasticity, which would have been indicated by significant differences in allometric exponents within treatments, was not observed in this study. Our results suggest that the differences observed in branch length were due to the direct effect of size rather than as a result of true plastic investment in branches.

scholarly journals Stepwise regression and principal component analyses for quantitative traits of rapeseed genotypes at different sowing dates

2016 ◽  
Vol 61 (4) ◽  
pp. 323-332
Author(s):  
Valiollah Rameeh
Keyword(s):  
Regression Analysis ◽  
Seed Yield ◽  
Seed Weight ◽  
Stepwise Regression ◽  
Principal Component ◽  
Sowing Date ◽  
Days To Flowering ◽  
The Third ◽  
Sowing Dates ◽  
Principal Component Analyses

The present research was done to assess the best selection criteria for yield improvement in rapeseed (Brassica napus L.) using stepwise regression and principal component analyses at different sowing dates. All the traits except 1000-seed weight were significantly affected by sowing dates. The results of stepwise regression analysis revealed that seeds per pod had an important role at the first and second sowing dates, but at the third and fourth sowing dates, pods per plant and days to flowering were more important than other yield components for a seed yield prediction model. On the basis of a cumulative percent of variation, three principal components (PCs) were determined for each sowing date. The cumulative percentages of variation for three PCs at the first to fourth sowing dates were 0.97, 0.96, 0.89 and 0.95, respectively. At the first sowing date, the first principal component (PC1) had high positive and negative PC loading values for the studied traits such as days to flowering, days to the end of flowering, duration of flowering, pods per plant and harvest index. Therefore, there was high variation in these traits among the genotypes. PC2 of the first sowing date had also high PC loadings for pods on the main raceme, seeds per pod, 1000-seed weight, biological and seed yields, therefore the correlation of these traits with this PC will be high. In PC3 of the first sowing date, height, pods on the main raceme and pods per plant had the high value of PC loadings. Based on stepwise regression analysis, seeds per pod at the first and second sowing dates and days to flowering and pods per plant at the third and fourth sowing dates had an important role for improving seed yield.

scholarly journals Вплив строків сівби на продуктивність гречки

2018 ◽  
pp. 166-171
Author(s):  
М. С. Ульянченко
Keyword(s):  
Grain Size ◽  
Sowing Date ◽  
Fagopyrum Esculentum ◽  
Air Separation ◽  
Forest Steppe ◽  
Average Value ◽  
Sowing Dates ◽  
Fagopyrum Esculentum Moench ◽  
Exact Effect ◽  
Seed Yields

На фоні нестабільних погодних умов весняного періоду, що відмічаються останнім часом, встановлення оптимальних строків сівби районованих сортів гречки набуває актуального значення. У статті експериментальним шляхом вивчали шість сортів гречки (Fagopyrum esculentum Moench) вітчизняної селекції: Ярославна, Слобожанка, Руслана, Українка, Крупинка, СИН-3/02 залежно від строків сівби в умовах нестійкого зволоження центрального Лісостепу. Для проведення досліджень використовували загальноприйняті та спеціальні методики: продуктивність сортів гречки та аналіз зернового матеріалу за елементами продуктивності визначали після очищення зерна методом повітряної сепарації та перерахунку на стандартну 14 % вологість. Для умов 2015 року встановлено, що елементи продуктивності гречки (крупність та кількість зерен з рослини) мають суттєвий вплив на формування продуктивності культури. За масою 1000 зерен виокремилися сорт Крупинка за раннього строку сівби, суттєво менші значення отримали за цим показником у сортів Слобожанка та Українка, відповідно, за сівби в перший та другий строк. Усі інші сорти за крупністю зерна мали середнє значення. Строки сівби сорту СИН-3/02 не мали впливу на елементи продуктивності. В умовах 2016 року за крупністю зерна виокремилися сорти Ярославна, Руслана та Крупинка за раннього та середнього строків сівби. Всі сорти, що  вивчалися, забезпечили вищу крупність зерна за раннього строку сівби, за виключенням сортів Ярославна та Українка. За результатами дворічних досліджень визначено, що ранньостиглі сорти гречки Ярославна і Руслана доцільно висівати з середини першої декади травня. Сорти Слобожанка і Крупинка формують найбільшу продуктивність за сівби в перший та другий строк. Чіткого впливу терміну сівби на даний показник у сортів СИН-3/02 та Українка не виявлено. The set of optimal sowing dates of the buckwheat is to the actual value on the background of unstable weather of the springtime. In the article, six species of buckwheat (Fagopyrum esculentum Moench) of domestic breeding: Yaroslavna, Slobozhanka, Ruslana, Ukrainka, Krupynka, SIN-3/02 were studied experimentally, depending on the time of sowing in conditions of unstable moisture of the Central Forest-Steppe. For research, conventional methods and special methods were used: productivity of buckwheat varieties and analysis of grain material by the elements of productivity were determined after purification of the grain by air separation method and converted to a standard 14 % moisture content. For the 2015 conditions it has been established that the elements of the buckwheat productivity: the size and number of grains from the plant have a significant effect on the formation of the productivity of the crop. By weight of 1000 grains, Krupynka variety was distinguished at early term sowings; significant lower values ​​were obtained for this variety in Slobozhanka and Ukrainka, respectively for sowing in the first and second terms. All other varieties according to grain size had an average value. The lines of sowing of the variety SIN-3/02 did not influence the elements of productivity. In the conditions of 2016, the varieties Yaroslavna, Ruslana and Krupynka were distinguished by grain size for early and medium term sowing. All varieties put on the study ensured a higher grain size in early sowing, with the exception of Yaroslavna and Ukrainka varieties. According to the results of two-year studies, it has been determined that early varieties of buckwheat Yaroslavna and Ruslana should be sown from the middle of the first decade of May. Sloboda and Krupynka grades produce the highest seed yields in the first and second lines. The exact effect of the sowing date on this indicator in the varieties SIN-3/02 and Ukrainka was not detected.

scholarly journals Estimation of buckwheat leaf area by leaf dimensions

2021 ◽  
Vol 42 (3Supl1) ◽  
pp. 1529-1548
Author(s):  
Alberto Cargnelutti Filho ◽  
◽  
Rafael Vieira Pezzini ◽  
Ismael Mario Márcio Neu ◽  
Gabriel Elias Dumke ◽  
...  
Keyword(s):  
Leaf Area ◽  
Linear Model ◽  
Leaf Blade ◽  
Sowing Date ◽  
Quadratic Model ◽  
Digital Photo ◽  
Sowing Dates ◽  
Leaf Dimensions ◽  
Fagopyrum Esculentum Moench ◽  
Uniformity Trials

The objective of this work was to model and identify the best models for estimating the leaf area, determined by digital photos, of buckwheat (Fagopyrum esculentum Moench) of the cultivars IPR91-Baili and IPR92-Altar, as a function of length (L), width (W) or length x width product (LW) of the leaf blade. Ten uniformity trials (blank experiments) were carried out, five with IPR91-Baili cultivar and five with IPR92-Altar cultivar. The trials were performed on five sowing dates. In each trial and cultivar, expanded leaves were collected at random from the lower, middle and upper segments of the plants, totaling 1,815 leaves. In these 1,815 leaves, L and W were measured and the LW of the leaf blade was calculated, which were used as independent variables in the model. The leaf area of each leaf was determined using the digital photo method (Y), which was used as a dependent variable of the model. For each sowing date, cultivar and thirds of the plant, 80% of the leaves (1,452 leaves) were randomly separated for the generation of the models and 20% of the leaves (363 leaves) for the validation of the models of leaf area estimation as a function of linear dimensions. For buckwheat, IPR91-Baili and IPR92-Altar cultivars, the quadratic model (Ŷ = 0.5217 + 0.6581LW + 0.0004LW2, R2 = 0.9590), power model (Ŷ = 0.6809LW1.0037, R2 = 0.9587), linear model (Ŷ = 0.0653 + 0.6892LW, R2 = 0.9587) and linear model without intercept (Ŷ = 0.6907LW, R2 = 0.9587) are indicated for the estimation of leaf area determined by digital photos (Y) based on the LW of the leaf blade (x), and, preferably, the linear model without intercept can be used, due to its greater simplicity.

scholarly journals Effect of soybean cultivars sowing dates on seed yield and its correlation with yield parameters

2021 ◽  
Author(s):  
Magdalena Borowska ◽  
Janusz Prusiński
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Seed Weight ◽  
Sowing Date ◽  
Protein Yield ◽  
Total Precipitation ◽  
Area Index ◽  
Soybean Cultivars ◽  
Temperature And Precipitation ◽  
Sowing Dates

The article presents the effect of three sowing dates on the growth, development and yielding of four soybean cultivars of different earliness and under different temperature and precipitation conditions across the years. The seed yield from early sowing significantly correlated with the total precipitation in June and July, and at later dates, also with the total precipitation in August. The significantly highest soybean yields were collected from the sowing at a turn of April and May, and the highest seed and protein yield, as well as protein content in seed, were recorded for the mid-early Merlin cultivar. Neither the number and the seed weight per pod nor the 1 000-seed weight significantly depended on the sowing date. Over years, a significant, almost linear decrease in the plant height and the first pod setting height, the weight of nodules, the protein yield and the LAI (leaf area index) value was observed. High significant correlations were found between the seed yield and the plant height and the first pod setting height, as well as between the seed number and the seed weight per pod and the 1 000-seed weight as well as between the plant height and the first pod setting height.  

scholarly journals Reacción de variedades de frijol común a Fusarium spp. y Rhizoctonia solani en el altiplano de México.

2015 ◽  
Vol 10 (1) ◽  
pp. 37 ◽  
Author(s):  
Rosa Navarrete-Maya ◽  
Jorge Acosta-Gallegos
Keyword(s):  
Adventitious Roots ◽  
Sowing Date ◽  
Infested Soil ◽  
Fusarium Spp ◽  
The Third ◽  
Sowing Dates ◽  
Severity Scores ◽  
Lower Severity ◽  
Moderately Resistant ◽  
Resistant Genotypes

Two trials were carried out at Texcoco, State of Mexico: in the first one 32 bean genotypes were sowed under irrigation on April 24 and May 8, 1997, in order to study their reaction to Fusarium spp. in a naturally infested soil. In the second one, protection against Fusarium spp. y R. solani was evaluated by applying captan or benomyl to the seeds of eight genotypes. In the first trial most genotypes were susceptible to Fusarium spp., particularly in the third evaluation (R6), on both sowing dates; with the exception of Negro Tacana and Amarillo de Calpan, both of which showed an intermediate reaction in the second sowing date. Incidence of Fusarium spp. was higher than 80%. On the first sowing date the Pinto Villa and Negro Perla genotypes were moderately resistant. In the second experiment the chemical treatment produced more vigorous seedlings. Pinto Villa and BAT 477 genotypes showed lower severity scores when treated with benomyl and captan, respectively. It was observed that plants of resistant genotypes survived because they developed adventitious roots.

EFFECT OF SEEDING RATE ON HEIGHT, YIELD AND QUALITY OF LARGE-SEEDED AND SEMI-DWARF BUCKWHEAT GENOTYPES

1986 ◽  
Vol 66 (1) ◽  
pp. 61-66 ◽  
Author(s):  
G. H. GUBBELS ◽  
C. G. CAMPBELL
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Seed Weight ◽  
Fagopyrum Esculentum ◽  
Seed Density ◽  
Seeding Rate ◽  
Consistent Effect ◽  
Yield And Quality ◽  
Fagopyrum Esculentum Moench

Two large-seeded buckwheat (Fagopyrum esculentum Moench.) cultivars, Mancan and Manor, and semi-dwarf lines, were grown at Morden and Portage la Prairie in the years 1979–1982 at seeding rates of 15, 30, 45 and 60 kg/ha. There was no consistent effect of seeding rate on plant height, seed weight (g/1000 seeds) or seed density. In six of the eight location-years there was no interaction of genotype × seeding rate for seed yield, indicating that, generally, the cultivars and lines reacted similarly to differences in seeding rate. It was concluded that a seeding rate of from 30 to 45 kg/ha would ensure optimum yield in most years.Key words: Buckwheat, Fagopyrum esculentum Moench., seeding rates

scholarly journals Sowing dates and node emission in buckwheat cultivars

2021 ◽  
Vol 42 (1) ◽  
pp. 105-122
Author(s):  
Alberto Cargnelutti Filho ◽  
◽  
Ismael Mario Márcio Neu ◽  
Rafael Vieira Pezzini ◽  
Gabriel Elias Dumke ◽  
...  
Keyword(s):  
Linear Regression ◽  
Fagopyrum Esculentum ◽  
Main Stem ◽  
Vegetative Development ◽  
Final Number ◽  
Sowing Dates ◽  
Fagopyrum Esculentum Moench

The aim of this study was to determine the rate of node appearance (RNA), the final number of nodes (FNN) and the period of node emission (PNE) in two buckwheat cultivars (Fagopyrum esculentum Moench) for different sowing dates, and to check variability in the RNA, FNN and PNE between the cultivars and sowing dates. The IPR91-Baili and IPR92-Altar cultivars were evaluated for 29 and 31 sowing dates from October to May in the 2017/2018 and 2018/2019 agricultural years respectively. In each experiment, a completely randomised design with five replications was used. The number of nodes (NN) on the main stem was counted twice a week in each plant (replication), from emission of the first node until the end of the cycle. The linear regression (y = a + bx) of the number of nodes (NN, y) was adjusted for each plant based on the number of days after emergence (DAE, x). The rate of node appearance (RNA), in days node-1, was determined from the inverse of the slope of the linear regression between NN and DAE (RNA = 1/b). The RNA was calculated for the period of node emission (PNE, in days), i.e. from emergence to emission of the last node. The final number of nodes (FNN) was counted at the end of node emission. Variability was found in the rate of node appearance (RNA), the final number of nodes (FNN) and the period of node emission (PNE) between the cultivars and sowing dates. The rate of node appearance ranges between 2.20 and 8.23 days node-1, the final number of nodes between 2.20 and 17.20, and the period of node emission between 16.60 and 49.20 days. Plants of the IPR91-Baili and IPR92-Altar cultivars show better vegetative development (lower RNA, higher FNN and greater PNE) when sown in November, December, January and February, compared to those sown in October, March, April and May.

Effect of sowing date on yield and yield components of three oilseed rape varieties

2003 ◽  
Vol 51 (3) ◽  
pp. 249-255 ◽  
Author(s):  
G. Fathi ◽  
S. A. Siadat ◽  
S. S. Hemaiaty
Keyword(s):  
Oilseed Rape ◽  
Yield Components ◽  
Seed Weight ◽  
Oil Content ◽  
Seed Oil ◽  
Sowing Date ◽  
Seed Oil Content ◽  
Plant Seeds ◽  
Single Seed ◽  
Sowing Dates

In order to elucidate the effect of sowing date on the yield and yield components of oilseed rape (Brassica napus L.), three varieties - Tower, Rafal and Global - were sown from 7 November to 22 December 2000-01 on four dates at an interval of 15 days in the Dezful region of Iran. A split-plot design based on randomized complete blocks with four replications was used in the experiment, where the sowing dates and cultivars formed the main and subplots, respectively. Variables including plant height, axillary branches/plant, pods/plant, seeds/pod, single seed weight, biomass, seed oil content and seed yield were measured. The soil of the experimental site had a loamy clay texture. The site had 250 mm annual precipitation and was located in the semi-arid zone. The results showed that the sowing date had a highly significant effect on morphological characteristics, yield components, oilseed rape yield and seed oil content. A delay in the sowing date caused a reduction in all the yield components especially in pods/plant, and in oilseed yield, which dropped from 285 g m-2 when sown on 7 November to 135 g m-2 when sowing was delayed to 22 December. Variations in sowing dates had different effects on the individual yield components, with pods/plant, seeds/pod and single seed weight decreasing to the greatest extent. The significant effect of variety on all characters with the exception of single seed weight indicated that there were genetic differences between the studied cultivars. Oilseed yield showed significantly positive correlations with pods/plant (r=0.93), single seed weight (r=0.83) and seeds/pod (r=0.66). The results of path analysis showed that pods/plant and seeds/pod had the highest positive and negative effects on oilseed yield, respectively. Finally, considering the susceptibility of pods/plant to variations in sowing date and the importance of this character in the size of the oilseed yield, a delay in the planting date in the Dezful region was found to reduce the oilseed yield through a reduction in pods/plant.

Effect of sowing date and harvest time on longevity of rice seeds

1997 ◽  
Vol 7 (1) ◽  
pp. 13-20 ◽  
Author(s):  
N. Kameswara Rao ◽  
M. T. Jackson
Keyword(s):  
Indica Rice ◽  
Sowing Date ◽  
Rice Cultivar ◽  
Japonica Rice ◽  
Rice Cultivars ◽  
Harvest Time ◽  
The Third ◽  
Sowing Dates ◽  
Germination Ability ◽  
The Mean

AbstractChanges in germination ability and longevity were monitored during seed development in three japonica rice cultivars and one indica rice cultivar sown on three different dates, 14 October 1993, 24 November 1993 and 5 January 1994 at Los Baños, Philippines. Germinability of the seeds varied among cultivars in the early stages of development, but it was generally similar across sowing dates. The estimates of potential longevity (determined by storage at 40°C and 15% moisture and quantified by the values of the seed lot constant K1 of the viability equation) differed among cultivars and sowing dates. While the maximum potential longevity attained across different sowing dates was similar in the japonica cultivars Ju ku and Chianan 8, it was significantly higher in the first sowing than in the second or third sowings in cv. Akihikari. In the indica cultivar IR 58, maximum potential longevity attained in the second and third sowings was significantly greater than that in the first sowing. The mean potential longevity, averaged over cultivars and sowing dates, was marginally higher in the first sowing (K1=3.81) than in the second (3.65) and third (3.63); and averaged over cultivars and harvest times it was greatest at 34.8 days after flowering (DAF) in the first sowing, 31.8 DAF in the second and 28.3 DAF in the third. These results suggest that sowing in mid-October to allow seed ripening to coincide with the cooler and drier segment of the Los Baños dry season, and harvesting 35 DAF can improve the potential longevity of some japonica cultivars.

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