Data/hora: 04/06/2024 17:58:40

Biblioteca(s): | Embrapa Trigo.
Data corrente: | 16/04/2021
Data da última atualização: | 10/12/2021
Autoria: | LOLLATO, R. P.; JAENISCH, B. R.; SILVA, S. R.
Afiliação: | ROMULO P. LOLLATO, Dep. of Agronomy, Kansas State Univ., 2004 Throckmorton Bld., 1712 Claflin Rd., Manhattan, KS 66506, USA; BRENT R. JAENISCH, 1 Dep. of Agronomy, Kansas State Univ., 2004 Throckmorton Bld., 1712 Claflin Rd., Manhattan, KS 66506, USA; SERGIO RICARDO SILVA, CNPT.
Título: | Genotype-specific nitrogen uptake dynamics and fertilizer management explain contrasting wheat protein concentration.
Ano de publicação: | 2021
Fonte/Imprenta: | Crop Science, p. 1-19, Dec. 2021.
DOI: | 10.1002/csc2.20442
Idioma: | Inglês
Conteúdo: | Increasing yield and grain protein concentration (GPC) in wheat (Triticum aestivum L.) without excessive nitrogen (N) rates requires increasing N use efficiency (NUE, yield per available N). We assessed the effects of N rate and timing on yield, GPC, and N nutritional indices of two winter wheat genotypes with similar yield but contrasting GPC. Factorial field experiments evaluated the wheat genotypes ?LCS Chrome? (high GPC) and ?WB?Grainfield? (low GPC), three N rates, and four N timings (?Fall?, 100% of N rate applied at Zadoks GS20; ?Spring?, 100% at GS25; ?Split?, 40% Fall plus 60% Spring; and ?Anthesis?, 40% fall, 50% spring, and 10% at GS61) in six Kansas environments. Yield ranged from 2,853 to 8,023 kg ha-1 and GPC from 88 to 152 g kg-1. Fall and spring N timing had the lowest and greatest yield difference from the zero-N control and showed linear, linear-plateau or no responses to N rate. ?LCS Chrome? had 5 to 19 g kg-1 greater GPC than ?WB?Grainfield?, which was associated with greater post-anthesis N uptake (24 vs 15% of maturity-N uptake), a greater spike N gain between anthesis and maturity (7.4 vs 6.5 g m-2), and greater N recovery efficiency (0.34 vs 0.28 kg kg-1). Greater N rates and Anthesis or Spring N timings increased GPC. The NUE (range: 20?311 kg kg-1) was inversely related to N availability, and Fall N timing had the lowest NUE. Our results highlighted physiological reasons for genotype-specific GPC performance and suggested agronomic opportunities to simultaneously improve wheat yield and GPC.
Palavras-Chave: | Grain protein concentration (GPC); Wheat (Triticum aestivum L).
Thesagro: | Trigo; Triticale.
Thesaurus Nal: | Wheat.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Trigo (CNPT)
Exemplares: | CNPT - (45094-1) - UPC - AP - DD -  -  -  - DIS