Differences in Weed Suppression between Two Modern and Two Old Wheat Cultivars at Different Sowing Densities

Wu, Yue; Xi, Nianxun; Weiner, Jacob; Zhang, Dayong

doi:10.3390/agronomy11020253

Cited by 10 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the study by Hussain et al [13] among the yield components, only the number of generative tillers per m −2 increased in proportion to the increase in the grain yield at higher seed rates. According to Wu et al [41], high sowing density as a purposeful agricultural practice increases yields, reduces weed infestation and increases sustainability by increasing biomass and soil cover during the growing season of the plants, which reduces nutrient loss and erosion. In 2019, there was a significant increase in the straw weight of Indian dwarf wheat at the sowing density of 600 pcs.…”

Section: Morphological and Agronomic Traitsmentioning

confidence: 99%

Response of Indian Dwarf Wheat and Persian Wheat to Sowing Density and Hydrothermal Conditions of the Growing Seasons

et al. 2022

View full text Add to dashboard Cite

The need for foods with high nutritional value has led to the rediscovery of ancient wheat species Triticum sphaerococcum and T. persicum as raw materials with valuable consumption properties, but their reintroduction requires assessment of their productivity under different agricultural practices. The field experiments were carried out for three years (2018–2020) to test the hypothesis that the sowing density of T. sphaerococcum and T. persicum (400, 500 and 600 no m−2) will affect their agronomic traits, yield and occurrence of diseases, but the response will depend on the hydrothermal conditions of the growing seasons. In this study, a significant correlation of the grain yield with the amount of precipitation in tillering, and from booting to the beginning of fruit development was demonstrated. The sowing density of T. sphaerococcum had an impact on the grain yield only under moderate drought stress during the growing season (2019), when the highest yield was obtained at a sowing density of 600 m−2. In 2019, the most favorable sowing density was also the highest for T. persicum. In the year with the lowest amount of rainfall during the growing season (2018), the yield of T. persicum was the highest in the lowest sowing density. At the shooting stage, a greater intensity of powdery mildew was observed on T. persicum, especially with higher sowing densities. Increasing the sowing density also increased the occurrence of root rot symptoms in both wheat species in the year that favored the occurrence of this disease (2018). It can be concluded that in the integrated low-input cultivation of T. sphaerococcum and T. persicum, it is justified to use a sowing density of 600 pcs. m−2, in an agroclimatic zone with moderate droughts during the growing season.

show abstract

Section: Morphological and Agronomic Traitsmentioning

confidence: 99%

Response of Indian Dwarf Wheat and Persian Wheat to Sowing Density and Hydrothermal Conditions of the Growing Seasons

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Thus, one can envision crop cultivars that have initial vigour and size, such that they can suppress weeds at high crop density, but do not show as much growth in height as other cultivars later in the season after the weeds have been suppressed and can therefore use more resources for yield production. A recent study comparing crop‐weed competition in two old and two new cultivars of spring wheat, grown in a uniform pattern at four densities under high weed pressure, provides support for this idea (Wu et al, 2021). Weed suppression increased with density for all four cultivars.…”

Section: The Example Of Crop Density and Spatial Uniformitymentioning

confidence: 92%

Weed suppression by cereals: Beyond ‘competitive ability’

Weiner

2023

Weed Research

Self Cite

View full text Add to dashboard Cite

Much research on cereal-weed competition has been directed towards finding cultivars that have high 'competitive ability' with weeds. I argue that this objective is insufficient, because weed suppression is usually the result of interactions among genotype, environment and management rather than direct effects of genotype, and this limits the usefulness of competitive ability as a general concept. The clearest example of this is the effect of cereal crop density. Cultivars of wheat and maize that compete best with weeds are often different at high versus low crop density. This is especially relevant because effective weed suppression, a reduction of weed growth to very low levels by competition from the crop, is only possible at high crop density and spatial uniformity. The potential for improving weed suppression by crops under standard regional management practices, which are usually based on weed-free conditions, is limited, and there is likely to be a significant cost in yield. To make major improvements in weed suppression and thereby reduce greatly our dependence on chemical weed control, researchers should focus more on management strategies that benefit the crop in competition with weeds, and then on traits that improve weed suppression under the relevant management regime, rather than considering differences in management as a form of environmental variation and looking for traits promoting general competitive ability.

show abstract

“…Accelerated vertical growth might provide an additional advantage for outcompeting neighbours, yet plant height has been strongly selected against during the green revolution of most cereals, including rice. Indeed, increased shading potential of the crop has a clear potential for improvement towards sustainable weed suppression (Pantazopoulou et al, 2021;Peerzada et al, 2017;Seavers & Wright, 1999), which also applies for cereal canopies, as has been shown for wheat and other cereals where a rapidly closing crop canopy achieved through higher planting density and/or uniform planting pattern depleted weeds from access to light (Chauhan & Abugho, 2013;Marín & Weiner, 2014;Ottis & Talbert, 2007;Park et al, 2003;Weiner et al, 2010;Wolfe et al, 2008;Wu et al, 2021). The critical period of weed competition in rice is from the moment of sowing up to at least six weeks after sowing in a DSR system (Abdullah Al Mamun, 2014;Azmi et al, 2007;Mennan et al, 2012;Raj & Syriac, 2017).…”

Section: Introductionmentioning

confidence: 98%

Towards increased shading capacity: A combined phenotypic and genetic analysis of rice shoot architecture

Huber,

Julkowska,

Snoek

et al. 2023

Plants People Planet

View full text Add to dashboard Cite

Societal Impact StatementRice farming is transitioning from transplanting rice seedlings towards the less labour‐intensive and less water‐demanding method of directly seeding rice. This, however, is accompanied by increased weed proliferation. To tackle this issue, this study seeks to identify how the crop itself can better suppress weeds, with a focus on light competition via shading. Using a rice diversity panel, traits were identified that contribute to enhanced shading capacity, and these traits were encapsulated into a single shading capacity metric. This was followed by the identification of the genetic loci underpinning variation in the core traits. The identified haplotypes can be used in breeding programmes to improve weed suppression by rice, thus contributing to sustainable agriculture.Summary In modern rice farming, one of the major constraints is weed proliferation and the entailed ecological impact of herbicide application. This requires increased weed competitiveness in current rice varieties, achieved via enhanced shade casting to limit the growth of shade‐sensitive weeds. To identify traits that increase rice shading capacity, we exhaustively phenotyped a rice diversity panel of 344 varieties at an early vegetative stage. A genome‐wide association study (GWAS) revealed genetic loci underlying variation in canopy architecture traits linked with shading capacity. The screen shows considerable natural variation in shoot architecture for 13 examined traits, of which shading potential is mostly determined by projected shoot area, number of leaves, culm height and canopy solidity. The shading rank, a metric based on these core traits, identifies varieties with the highest shading potential. Five genetic loci were found to be associated with canopy architecture, shading potential and early vigour. Identification of traits contributing to shading capacity and underlying allelic variation will serve future genomic‐assisted breeding programmes. Implementing the presented genetic resources for increased shading and weed competitiveness in rice breeding will make its farming less dependent on herbicides and contribute towards more environmentally sustainable agriculture.

show abstract

Differences in Weed Suppression between Two Modern and Two Old Wheat Cultivars at Different Sowing Densities

Cited by 10 publications

References 31 publications

Response of Indian Dwarf Wheat and Persian Wheat to Sowing Density and Hydrothermal Conditions of the Growing Seasons

Response of Indian Dwarf Wheat and Persian Wheat to Sowing Density and Hydrothermal Conditions of the Growing Seasons

Weed suppression by cereals: Beyond ‘competitive ability’

Towards increased shading capacity: A combined phenotypic and genetic analysis of rice shoot architecture

Contact Info

Product

Resources

About