摘要:

Résumé:Une méthode est décrite pour la mesure du coefficient de diffusion. Elle est simple à mettre en oeuvre et ne nécessite pas de molécules marquées par un isotope radioactif. Appliquée à l'atrazine en solution aqueuse, elle indique un coefficient d'autodiffusion d'environ 5,6. 10−6cm2s−1, légèrement inférieur à celui mentionné d

ISSN:0043-1737    

DOI:10.1111/j.1365-3180.1976.tb00378.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

Summary:The effect of five densities of annual ryegrass (Lolium rigidumGaud.) on the growth, moisture usage and grain yield of wheat at three sowing times was determined in the field. The presence of ryegrass reduced wheat dry matter production and grain yields by decreasing fertile tiller and fertile spikelet production. Ryegrass was more competitive in the later sown crops and its effect on wheat grain yield was directly proportional to the square root of its density. The relationship between ryegrass density and wheat yield reduction is quantitatively described.

ISSN:0043-1737    

DOI:10.1111/j.1365-3180.1976.tb00379.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0043-1737    

DOI:10.1111/j.1365-3180.1976.tb00380.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0043-1737    

DOI:10.1111/j.1365-3180.1976.tb00381.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

Book reviewed in this article:Malezas prevalentes de America Central (Common weeds of Central America)By J.G.L. Garcia; B. MacBryde; A.R. Molina and O. Herrera MacBryde.

ISSN:0043-1737    

DOI:10.1111/j.1365-3180.1976.tb00382.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY