摘要:

ABSTRACTThe uptake of N was measured in 2 successive regrowths harvested on 12 June and 13 Aug. following harvests of primary growths 8, 12, 16, 23, 29, 45 and 57 (12 June) days after applying N at 59, 118 or 177 kg N/ha on 16 Apr.Residual responses were obtained to both increments of N, leading to high apparent recoveries of fertilizer N, especially to the higher increment. This increased availability of soil N when high rates of N are applied is shown to vary with date of harvest of primary growth, reaching a maximum equivalent to 151% apparent fertilizer N recovery 23 days after N application.In the second regrowth, percentage N in the herbage showed a negative response to N applied to the primary growth. This appears to reflect a reduction in available soil N brought about by its increased availability and uptake in primary growth and first regrowth.The possibilities of improving the efficiency of fertilizer N by exploiting soil N are considered against the possible reduction in available N for future regrowths.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1974.tb01230.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1974.tb01231.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Book reviewed in this article:LANGER, R. H. M. (Editor) Pastures and pasture plants.TOTHILL, J. C.&HACKER, J. B. The grasses of Southeast Queensland.TOOSEY, R. D. Profitable fodder cropping.KÖHNLEIN, J. [Basis of fodder production teaching.] Grundriss der Futterbaulehre.WIENEKE, F. [Techniques of fodder conservation.] Verfahrenstechnik der Halmfutterproduktion.VALLENTINE, J. F. Range development and improvements.FRYER, J. D.; MAKEPEACE, R. J. (Editors) Weed control handbook.MARTIN, H. (Editor) Insecticide and fungicide handbook for crop protection

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1974.tb01232.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY