Nitrogen studies in Lolium perenne grown for seed I. Level of application

Autor:	P. D. Hebblethwaite, J. D. Ivins
Rok vydání:	1977
Předmět:	Crop Perennial plant Dry weight Agronomy chemistry Yield (wine) chemistry.chemical_element Management Monitoring Policy and Law Biology biology.organism_classification Agronomy and Crop Science Lolium perenne Nitrogen
Zdroj:	Grass and Forage Science. 32:195-204
ISSN:	1365-2494 0142-5242
DOI:	10.1111/j.1365-2494.1977.tb01434.x
Popis:	In field trials in 1971–73, perennial ryegrass cv. S23 and S24 were given up to 200 kg ha−1 nitrogen (N) and dry weight, seed yields and seed yield components measured. Optimum levels of applied N ranged from 80 kg ha−1, where livestock had grazed the crop in the establishment year or where residual N levels were about 70 kg ha−1, to 120 kg ha−1 where residual N was low. Application of more than 120 kg ha−1 did not increase yields further because of increased lodging and increased production of vegetative tillers. Seed set was 37–55% in S24 and 25–29% in S23 and was decreased by lodging.
Databáze:	OpenAIRE
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