Management of maize stand height using growth regulators

Spitzer, T.; Míša, P.; Bílovský, Jan; Kazda, Jan

doi:10.17221/105/2014-pps

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…Thus, a hypothesis could be made, that the internodes positioned above the ear and which were smaller would be the ones that had their respective diameters changed by the growth regulator. Some evidences indicate that, in maize, the position of the internode on the stalk that will be affected by the exogenous application of growth regulator is dependent on the ear differentiation, i.e., if the ear is not differentiated, the affected internodes will be those below the ear, and if the ear is already differentiated, the affected internodes will be positioned above this organ (Spitzer et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

“…Higher auxin concentration favors formation of xylem vessels, and higher gibberellin levels favor production of phloem vessels (Aloni, 1987). Other potential consequence may be an accelerated elongation of metaxylem, epidermal and cortical cells, with consequent increase of vacuolization of cells (Spitzer et al, 2015). Thus, it is possible that more differentiation of the xylem vessels to the detriment of the phloem vessels may likely have occurred in the plants that were subjected to product application.…”

Section: Resultsmentioning

confidence: 99%

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Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

et al. 2020

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ABSTRACT: High nitrogen rates favor maize vegetative growth and grain yield losses due to stem lodging. The use of growth regulators can mitigate such effect. This work was carried out aiming to evaluate the effect of trinexapac ethyl on maize hybrids response to side-dress nitrogen rates. The experiment was carried out in Lages, Santa Catarina State, South of Brazil, during two growing seasons with two hybrids (P1680 and P30F53), and four nitrogen rates (0, 150, 300 and 450 kg N ha-1) were tested, with and without the presence of trinexapac ethyl. The experimental design was in randomized blocks arranged in split-split plots, with three replications per treatment. The plants height and ear insertion height, plant lodging and breaking, grain yield and yield components were evaluated. Grain yield increased in a quadratic way with increased nitrogen rate. The highest grain yields were 15,784 and 15,257 kg ha-1, in 2014/15 and 2015/16, respectively. Application rates higher than 150 kg of N ha-1, regardless of the use of the plant growth regulator, promoted maximum grain yield increases, ranging from 14.7 to 18.1%. The application of trinexapac-ethyl reduced the upper stem internode length, 1000-grain dry weight and did not affect the percentage of lodged plants and grain yield of both hybrids. Therefore, the use of trinexapac-ethyl did not enhance the maize grain yield response to increased rates of side-dress nitrogen.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

et al. 2020

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“…Under semiarid conditions with frequently occurring water limitations, grain yield could be improved with PAC or UCZ application (Ahmad et al., 2018, 2019; Kamran et al., 2018a,2018b; 2020). On the other hand, well‐watered maize plants, grown either under conditions in a greenhouse or in humid areas, mainly showed grain yield depressions due to treatments with growth regulators (Hütsch & Schubert, 2018; Schluttenhofer et al., 2011; Spitzer et al., 2015). In the present container experiment, soil water content was adjusted to 60% max.…”

Section: Discussionmentioning

confidence: 99%

“…UCZ application even in small dosages significantly decreased main cob grain weight in comparison with the untreated control (Schluttenhofer et al, 2011). In a maize field study under humid conditions, where chlorocholine chloride (CCC) and other growth regulators were applied in various dosages and at different growth stages, grain yield losses of 0.6 t ha -1 were obtained (Spitzer et al, 2015). In contrast, Xu et al (2004) found an increase in cob size when UCZ was applied at early growth stages, pointing to the impact of application time on yield performance.…”

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confidence: 99%

Water‐use efficiency of maize may be increased by the plant growth regulator paclobutrazol

Hütsch

Schubert

2020

J Agronomy Crop Science

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“…The effects depended on the growth stage when CCC was applied. However, in other studies, CCC application displayed either no influence on maize yield (Spitzer, M ı sa, B ılovsky, & Kazda, 2015) or significantly decreased kernel number per cob and kernel weight, resulting in yield decrease (Wang et al, 2016). In conclusion, the results of growth regulator application on maize vegetative development and grain yield performance are contradictory.…”

Section: Introductionmentioning

confidence: 91%

Maize harvest index and water use efficiency can be improved by inhibition of gibberellin biosynthesis

Hütsch

Schubert

2017

J Agronomy Crop Science

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Possibilities to improve maize harvest index and nutrient utilization efficiency by application of plant growth regulators were investigated. In container experiments, the effects of different growth regulators on the development of the maize (Zea mays L.) cultivars Pioneer 3906 and Fabregas were tested. Paclobutrazol (PAC) and chlorocholine chloride (CCC), two inhibitors of gibberellin biosynthesis, as well as gibberellic acid (GA3) were applied at growth stage V5. Three weeks after application of PAC, shoot growth of both maize cultivars was strongly affected with a significant decrease in plant height in the PAC treatment by 44% and 36% for Pioneer 3906 and Fabregas, respectively. The growth‐retarded plants had higher leaf areas and reduced transpiration rates. The higher shoot growth after GA3 application was accompanied by a reduction in leaf area and an increase in transpiration rate during 1 week before anthesis. CCC treatment showed no significant effects on plant height, leaf area and transpiration rate. The PAC‐treated cultivar Pioneer 3906 produced several cobs per plant, which were mainly barren at maturity. However, PAC application to Fabregas resulted in just one cob per plant with good kernel development and a grain yield, which was not significantly reduced in comparison with the control. With this similar grain yield in combination with a straw yield decrease of 32%, the harvest index was significantly improved by 12%. In addition, with PAC‐treated Fabregas plants, a 19% increased water use efficiency of the grain (WUEgrain) during the critical period of kernel setting was achieved. In this maize cultivar, CCC application also improved harvest index by 5%, but no effect on WUEgrain occurred. GA3 treatment decreased harvest index of both maize cultivars, and it either reduced WUEgrain (Pioneer 3906) or showed no effect (Fabregas). Utilization efficiencies of N, P and K were not increased with growth regulator application, even in the PAC‐treated Fabregas plants with a significantly improved allocation of assimilates to the grain, mirrored by the higher harvest index. The results indicate that fertilizer applications must be adjusted to the reduced demand of growth‐retarded plants, most likely leading to higher nutrient utilization efficiencies.

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Management of maize stand height using growth regulators

Cited by 11 publications

References 21 publications

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

Water‐use efficiency of maize may be increased by the plant growth regulator paclobutrazol

Maize harvest index and water use efficiency can be improved by inhibition of gibberellin biosynthesis

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