Effects of the application rate and time of the growth regulator trinexapac-ethyl in seed crops of Lolium perenne L. in relation to spring nitrogen rate

G.E.L. Borm, W. van den Berg

    Research output: Contribution to journalArticleAcademicpeer-review

    11 Citations (Scopus)

    Abstract

    To test the effects of the growth regulator trinexapac-ethyl (Moddus 250 EC) in the main seed crop of grasses in the Netherlands, 10 field trials were conducted in perennial ryegrass (Lolium perenne L.). These field trials were carried out in first and second seed harvest crops during 1999¿2002. Four rates of Moddus (untreated, 0.4, 0.8 and 1.6 L product ha¿1) were applied at the start of stem elongation (DC 30¿31, zero to one node) during the first two years. In addition, the effect of timing of the application of 0.8 L Moddus ha¿1 was studied (untreated, DC30¿31, DC31¿33, DC33¿37). In most trials, in addition to the normal amount, 45 kg N ha¿1 extra spring nitrogen was applied. The work reported is valuable, and has relevance to all areas of the globe where this perennial ryegrass is grown for seed, e.g., northern Europe, the US (particularly, Oregon), New Zealand, Australia, Chile and Argentina. Crop development in spring was partly affected by weather conditions during the previous autumn and winter, so while Moddus was applied at the same crop development stage, the calendar dates varied for the different harvest years. Temperature sum from 1 November accounted for only 51.4% of the variation. Applications at higher rates increased the reduction of stem length, lodging of the crop and the density of panicles. Application later than DC30¿31 resulted in shorter culm length and higher total dry matter weight of the crop. The application of the highest rate of Moddus (1.6 L ha¿1) at the crop development stage DC30¿31 never resulted in an unacceptable final phytotoxic effect. Effect of Moddus on seed yields was inconsistent; the potential seed yield increase was about 10%. In general, there was no significant interaction between the application of 0.8 L Moddus ha¿1 at the crop development stage DC30¿31 and the spring nitrogen rate. The results show that DC31¿33 is the best time to apply 0.8 L Moddus ha¿1. In second seed harvest crops of lawn types applying 0.8 L Moddus ha¿1 together with increasing the amount of spring nitrogen can be considered
    Original languageEnglish
    Pages (from-to)182-192
    JournalField Crops Research
    Volume105
    Issue number3
    DOIs
    Publication statusPublished - 2008

    Fingerprint

    growth regulator
    growth regulators
    Lolium perenne
    application rate
    seed
    crop
    nitrogen
    crops
    seeds
    seed yield
    field experimentation
    stem
    rate
    effect
    application timing
    lodging
    Northern European region
    stem elongation
    heat sums
    dry matter

    Keywords

    • yield

    Cite this

    @article{fce9366564c4466c860b0a1c20f3bc46,
    title = "Effects of the application rate and time of the growth regulator trinexapac-ethyl in seed crops of Lolium perenne L. in relation to spring nitrogen rate",
    abstract = "To test the effects of the growth regulator trinexapac-ethyl (Moddus 250 EC) in the main seed crop of grasses in the Netherlands, 10 field trials were conducted in perennial ryegrass (Lolium perenne L.). These field trials were carried out in first and second seed harvest crops during 1999¿2002. Four rates of Moddus (untreated, 0.4, 0.8 and 1.6 L product ha¿1) were applied at the start of stem elongation (DC 30¿31, zero to one node) during the first two years. In addition, the effect of timing of the application of 0.8 L Moddus ha¿1 was studied (untreated, DC30¿31, DC31¿33, DC33¿37). In most trials, in addition to the normal amount, 45 kg N ha¿1 extra spring nitrogen was applied. The work reported is valuable, and has relevance to all areas of the globe where this perennial ryegrass is grown for seed, e.g., northern Europe, the US (particularly, Oregon), New Zealand, Australia, Chile and Argentina. Crop development in spring was partly affected by weather conditions during the previous autumn and winter, so while Moddus was applied at the same crop development stage, the calendar dates varied for the different harvest years. Temperature sum from 1 November accounted for only 51.4{\%} of the variation. Applications at higher rates increased the reduction of stem length, lodging of the crop and the density of panicles. Application later than DC30¿31 resulted in shorter culm length and higher total dry matter weight of the crop. The application of the highest rate of Moddus (1.6 L ha¿1) at the crop development stage DC30¿31 never resulted in an unacceptable final phytotoxic effect. Effect of Moddus on seed yields was inconsistent; the potential seed yield increase was about 10{\%}. In general, there was no significant interaction between the application of 0.8 L Moddus ha¿1 at the crop development stage DC30¿31 and the spring nitrogen rate. The results show that DC31¿33 is the best time to apply 0.8 L Moddus ha¿1. In second seed harvest crops of lawn types applying 0.8 L Moddus ha¿1 together with increasing the amount of spring nitrogen can be considered",
    keywords = "yield",
    author = "G.E.L. Borm and {van den Berg}, W.",
    year = "2008",
    doi = "10.1016/j.fcr.2007.10.001",
    language = "English",
    volume = "105",
    pages = "182--192",
    journal = "Field Crops Research",
    issn = "0378-4290",
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    Effects of the application rate and time of the growth regulator trinexapac-ethyl in seed crops of Lolium perenne L. in relation to spring nitrogen rate. / Borm, G.E.L.; van den Berg, W.

    In: Field Crops Research, Vol. 105, No. 3, 2008, p. 182-192.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Effects of the application rate and time of the growth regulator trinexapac-ethyl in seed crops of Lolium perenne L. in relation to spring nitrogen rate

    AU - Borm, G.E.L.

    AU - van den Berg, W.

    PY - 2008

    Y1 - 2008

    N2 - To test the effects of the growth regulator trinexapac-ethyl (Moddus 250 EC) in the main seed crop of grasses in the Netherlands, 10 field trials were conducted in perennial ryegrass (Lolium perenne L.). These field trials were carried out in first and second seed harvest crops during 1999¿2002. Four rates of Moddus (untreated, 0.4, 0.8 and 1.6 L product ha¿1) were applied at the start of stem elongation (DC 30¿31, zero to one node) during the first two years. In addition, the effect of timing of the application of 0.8 L Moddus ha¿1 was studied (untreated, DC30¿31, DC31¿33, DC33¿37). In most trials, in addition to the normal amount, 45 kg N ha¿1 extra spring nitrogen was applied. The work reported is valuable, and has relevance to all areas of the globe where this perennial ryegrass is grown for seed, e.g., northern Europe, the US (particularly, Oregon), New Zealand, Australia, Chile and Argentina. Crop development in spring was partly affected by weather conditions during the previous autumn and winter, so while Moddus was applied at the same crop development stage, the calendar dates varied for the different harvest years. Temperature sum from 1 November accounted for only 51.4% of the variation. Applications at higher rates increased the reduction of stem length, lodging of the crop and the density of panicles. Application later than DC30¿31 resulted in shorter culm length and higher total dry matter weight of the crop. The application of the highest rate of Moddus (1.6 L ha¿1) at the crop development stage DC30¿31 never resulted in an unacceptable final phytotoxic effect. Effect of Moddus on seed yields was inconsistent; the potential seed yield increase was about 10%. In general, there was no significant interaction between the application of 0.8 L Moddus ha¿1 at the crop development stage DC30¿31 and the spring nitrogen rate. The results show that DC31¿33 is the best time to apply 0.8 L Moddus ha¿1. In second seed harvest crops of lawn types applying 0.8 L Moddus ha¿1 together with increasing the amount of spring nitrogen can be considered

    AB - To test the effects of the growth regulator trinexapac-ethyl (Moddus 250 EC) in the main seed crop of grasses in the Netherlands, 10 field trials were conducted in perennial ryegrass (Lolium perenne L.). These field trials were carried out in first and second seed harvest crops during 1999¿2002. Four rates of Moddus (untreated, 0.4, 0.8 and 1.6 L product ha¿1) were applied at the start of stem elongation (DC 30¿31, zero to one node) during the first two years. In addition, the effect of timing of the application of 0.8 L Moddus ha¿1 was studied (untreated, DC30¿31, DC31¿33, DC33¿37). In most trials, in addition to the normal amount, 45 kg N ha¿1 extra spring nitrogen was applied. The work reported is valuable, and has relevance to all areas of the globe where this perennial ryegrass is grown for seed, e.g., northern Europe, the US (particularly, Oregon), New Zealand, Australia, Chile and Argentina. Crop development in spring was partly affected by weather conditions during the previous autumn and winter, so while Moddus was applied at the same crop development stage, the calendar dates varied for the different harvest years. Temperature sum from 1 November accounted for only 51.4% of the variation. Applications at higher rates increased the reduction of stem length, lodging of the crop and the density of panicles. Application later than DC30¿31 resulted in shorter culm length and higher total dry matter weight of the crop. The application of the highest rate of Moddus (1.6 L ha¿1) at the crop development stage DC30¿31 never resulted in an unacceptable final phytotoxic effect. Effect of Moddus on seed yields was inconsistent; the potential seed yield increase was about 10%. In general, there was no significant interaction between the application of 0.8 L Moddus ha¿1 at the crop development stage DC30¿31 and the spring nitrogen rate. The results show that DC31¿33 is the best time to apply 0.8 L Moddus ha¿1. In second seed harvest crops of lawn types applying 0.8 L Moddus ha¿1 together with increasing the amount of spring nitrogen can be considered

    KW - yield

    U2 - 10.1016/j.fcr.2007.10.001

    DO - 10.1016/j.fcr.2007.10.001

    M3 - Article

    VL - 105

    SP - 182

    EP - 192

    JO - Field Crops Research

    JF - Field Crops Research

    SN - 0378-4290

    IS - 3

    ER -