Nitrogen studies inLolium perennegrown for seed. II. Timing of nitrogen application

Autor:	J. D. Ivins, P. D. Hebblethwaite
Rok vydání:	1978
Předmět:	Agronomy biology chemistry Perennial plant otorhinolaryngologic diseases food and beverages chemistry.chemical_element Management Monitoring Policy and Law biology.organism_classification Agronomy and Crop Science Lolium perenne Nitrogen Apex (geometry)
Zdroj:	Grass and Forage Science. 33:159-166
ISSN:	0142-5242
DOI:	10.1111/j.1365-2494.1978.tb00815.x
Popis:	The effects of applying nitrogen at different growth stages to S24 and S23 perennial ryegrass grown for seed were investigated in a series of field experiments from 1971 to 1976. These varieties of ryegrass were found to be insensitive to timing of nitrogen application from apex initiation to the stage when ears first emerged. However, if nitrogen application was delayed until about 30% or more of the ears had emerged, yields were lower compared with earlier applications, this effect being significant when nitrogen was delayed until 70–80% ear emergence because of a decrease in both numbers of fertile tillers and number of seeds per unit area. No advantages were found for splitting nitrogen applications between apex initiation and ear emergence.
Databáze:	OpenAIRE
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