Seeding Rate for Dryland Wheat (original) (raw)
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Preliminary Results Regarding the Optimal Seed Rates of Some Winter Wheat Varieties
LIFE SCIENCE AND SUSTAINABLE DEVELOPMENT, 2023
Before to extended on large surfaces, the new wheat varieties need to be examinate to finding their requirements regarding technological components, like planting density. In accord with this demand, during the agricultural year 2021-2022 were tested at Oradea, in northwest of Romania, our news registered varieties Dacic and Biharia, beside of other 23 Romanian or foreign varieties of wheat, at seven seeding rates:200, 300, 400, 500, 600, 700 and 800 seeds/m 2. Statistical processing of the yield and wheat features were dan by usual correlation (Pearson), Spearman rank correlations, the calculations of linear and quadratic equations of correlations between grain yield and seeding rate and calculation of linear, quadratic, exponential and logarithmic trend between the same characters, the trend of the most significant determination coefficient being utilised in graphical transpositions. Some genotypes (Voinic, Bogdana, Dacic, Cezara and Crisana) have their best ranks of yield at low densities while other (Gabrio, Consecvent, Anapurna and Abundent) at the greatest ones. Taking in consideration the average of ranks, the genotype Consecvent has the best average position, followed by Gabrio, Abundent, Bogdana and Voinic. These five genotypes have a good capability to adjust their yields components to vary densities of plants. At low densities (200, 300, 400 and 500 germinal seeds/m 2), the genotypes yield ranks are comparable but at high densities (more than six hundred seeds/m 2), the ranks are stronger effected by density. Every genotype has an optimum seed density, depending on its capacity to tolerate or no high density: Crisana-500 seed/m 2 , Biharia-600 seed/m 2 , Consecvent-600 to 700 seed/m 2 , Anapurna-800 seed/m 2 , etc. Some varieties, like Voinic, have a pour response to seeding rate, they yielded well even at small density, being able to compensate the reduced density by tillering capacity, number of grains/spikes, better test weight and bigger grain size.
Response of different wheat varieties to various seed rates
Experiment was conducted to study the response of different wheat varieties to various seed rates. The experiment consists of five different wheat varieties (V1 = Nasir-2k, V2 = Salim-2k, V3 = Bakhtawar-92, V4 = Fakhre-e-Sarhad and V5 = Lucky J-03) were sown at five various seed rates (S1 = 60 kg ha-1 , S2 = 80 kg ha-1 , S3 = 100 kg ha-1 , S4 = 120 kg ha-1 and S5 = 140 kg ha-1). Data recorded from the varieties treatments revealed that maximum tillers m-2 (377), leaf area index (4.10), grains spike-1 (68), 1000-grain weight (45.24 g), grain yield (4022 kg ha-1), biological yield (16660 kg ha-1), net income (Rs. 61921), BCR (4.99 %) and MRR % (499.49) was noted from the plots sown with variety Fakhr-e-Sarhad. Statistical analysis of the data also revealed that seed rates were significantly affected all parameters except biological yield and harvest index. It can be inferred from the data showed that maximum ((369) tillers m-2 , grains spike-1 (65), leaf area index (4.03), 1000-grain weight (45.30 g), grain yield (4222 kg ha-1), biological yield (15030 kg ha-1), net income (Rs. 62119), BCR (5.18 %) and MRR % (518.03) was noted from the plots seeded with 120 kg ha-1. In case of interaction between varieties and seed rate it was observed that maximum (420.25) tillers m-2 , leaf area index (4.79), grains spike-1 (74), 1000-grain weight (47.33 g), grain yield (4676 kg ha-1), biological yield (19535 kg ha-1), net income (Rs. 66863), BCR (5.47 %) and MRR % (546.95) was noted from the plots sown with FakhreSarhad and seed rate was used at120 kg ha-1 .
Determination of seed rate of wheat (Triticum aestivum L.) varieties with varying seed size.pdf
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Winter Wheat Cropping System Response to Seed Treatments, Seed Size, and Sowing Density
Agronomy Journal, 2016
W inter wheat production has yet to reach its full potential in the Canadian prairies. While the area sown to winter wheat has increased recently to fi nally eclipse plantings from the previous production peak in 1987, it remains variable ranging from 50,000 to 600,000 ha (Anonymous, 2015a). Compared to other wheat classes, the relatively low winter wheat production area (255,000 ha in 2010-2011) suggests that producers consider other crops more attractive or that there are management impediments to growing winter wheat. An informal survey of producers (Paul Th oroughgood, personal communication, 2010) identifi ed poor stand establishment, and consequent lower than ideal yield, as an impediment to existing and especially to new winter wheat growers. Traditionally, successful winter wheat production generally required direct seeding from late August to early September into standing canola (Brassica spp.) and mustard (B. juncea L.) stubble (Fowler, 2002a). Th ese crop stubbles trap snow to provide the requisite insulation that moderates soil temperature, leading to optimum winter survival. Harvesting a canola crop early enough to consistently seed winter wheat in this time frame is diffi cult as newer hybrids with higher yield potential also generally have longer growing degree-day requirements, which results in later harvests. Research into alternative stubble indicates that Brassica spp. crops are not an exclusive prerequisite. Irvine et al. (2013) reported similar winter wheat yield was produced from winter wheat planted onto canola, pea (Pisum sativum L.), or barley (Hordeum vulgare L.) silage stubble. Th e results of this study demonstrate that alternatives to canola stubble exist without introducing any impediments to stand establishment provided correct seeding depths and planting dates are adopted (Fowler, 1982, 1983a, 1983b, 1986). Stand establishment issues can also be an artifact of sowing density. Th e seeding rate recommended in a mid-1970s production guide specifi ed 67 to 78 kg ha-1 (<200 seeds m-2) (Grant et al., 1974). Studies by Entz and Fowler (1991) and
Seeding density in wheat: the more, the merrier?
Scientia Agricola, 2013
Adjustment of seeding schemes is one of the crop management techniques that most influences grain yield components. This work aimed to characterize the potential grain yield and its components in wheat (Triticum aestivum L.) genotypes with contrasting tillering ability under different seeding densities and environments. Five experiments were conducted in split-plot design, each with ten cultivars (main plot), sown in five distinct seeding densities (subplots). Experiments were sown in three locations in southern Brazil in the years 2005, 2006 and 2007. The grain yield per plot and its yield components: number of fertile tillers, weight of 1,000 grains, ear weight and number of grains per ear were evaluated. Genotypes with reduced tillering ability expressed an increase in grain yield with an increase in seeding densities, however
Journal of Agronomy and Crop Science, 2006
Growth and yield of wheat are affected by environmental conditions and can be regulated by sowing time and seeding rate. In this study, three sowing times [winter sowing (first week of September), freezing sowing (last week of October) and spring sowing (last week of April)] at seven seeding rates (325, 375, 425, 475, 525, 575 and 625 seeds m−2) were investigated during the 2002–03 and 2003–04 seasons, in Erzurum (Turkey) dryland conditions, using Kirik facultative wheat. A split-plot design was used, with sowing times as main plots and seeding rates randomized as subplots. There was a significant year × sowing time interaction for grain yield and kernels per spike. Winter-sown wheat produced a significantly higher leaf area index, leaf area duration, spikes per square metre, kernel weight and grain yield than freezing- and spring-sown wheat. The optimum time of sowing was winter for the facultative cv. Kirik. Grain yields at freezing and spring sowing were low, which was largely the result of hastened crop development and high temperatures during and after anthesis. Increasing seeding rate up to 525 seeds m−2 increased the spikes per square metre at harvest, resulting in increased grain yield. Seeding rate, however, was not as important as sowing time in maximizing grain yield. Changes in spikes per square metre were the major contributors to the grain-yield differences observed among sowing times and seeding rates. Yield increases from higher seeding rates were greater at freezing and spring sowing. We recommended that a seeding rate of 525 seeds m−2 be chosen for winter sowing, and 575 seeds m−2 for freezing and spring sowing.
Effect of seeding rate on grain quality of winter wheat
Chilean journal of agricultural research, 2014
Planting density is important factor which influence yield and quality of wheat (Triticum aestivum L.) For this reason, in scientific investigations is constantly investigated optimization of plant number per unit area. The objective of this study was to determine the influence of seeding rate in grain quality of winter wheat cultivars. The experiment was conducted with four winter wheat genotypes ('Ana Morava', 'Vizija', 'L-3027', and 'Perla') at the Small Grains Research Centre of Kragujevac, Serbia, in 3 yr at two seeding rates (SR1 = 500 and SR2 = 650 germinating seeds m-2). The 1000-kernel weight, Zeleny sedimentation, and wet gluten content in divergent wheat genotypes were investigated depending on the seeding rate and ecological factors. Significant differences in quality components were established between investigated seeding rates. The highest values of all investigated quality traits were established in SR2 variant when applied 650 seeds m-2. Genotypes reacted differently to seeding rate. 'Perla' in average had the highest mean sedimentation value (42.2 mL) and wet gluten content (33.76%) in SR2 variant and this cultivar responded the best to seeding rate. Significant differences for sedimentation value and wet gluten content were found among cultivars, years, seeding rate, and for all their interactions. Also, ANOVA for 1000-kernel weight showed highly significant differences among investigated varieties, seeding rate and growing seasons, but all their interactions were not significant. In all investigated genotypes, better quality was established in SR2 variant when applied 650 seeds m-2 .
Australian Journal of Experimental Agriculture, 2004
Seventeen experiments were conducted in 1996, 1997 and 1998 in the central and northern wheatbelt of Western Australia, covering a range of soil types, seasonal rainfall, cultivars and sowing times. The objective of the experiments was to investigate how these factors affect the range of optimum seed rates derived from seeding rate experiments and, thus, to improve advice to farmers. Our results suggest that soil type and seasonal rainfall were the major factors influencing the differences in optimum seed rate. Regression tree methods were used to show that experiments in clay loam soils had higher optimum seed rates (52–76 kg/ha, depending on the cultivars used). In sandier soils, the optimum seed rate was lower (35–60 kg/ha, depending on cultivar and sowing time) but higher (67�kg/ha) at higher seasonal rainfall (>450 mm). We found some cultivars were grouped into consistent response patterns. Sowing time also influenced optimum seed rate; later sowing required higher seed rate...