The climate induced probability distribution of short-term responses of a tropical grass to nitrogen fertilizer

Murtagh, G.J. (1977) The climate induced probability distribution of short-term responses of a tropical grass to nitrogen fertilizer. Australian Journal of Experimental Agriculture and Animal Husbandry, 17 (87). pp. 614-620.

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Abstract

The probability distribution of the DM response of a tropical grass to N fertilizer was calculated by applying previously-established relations between DM response and environmental conditions to long-term climate records. The analysis was made for Setaria anceps [= S. sphacelata] growing on an alluvial soil following an application of 112 kg N/ha. It included 6 application dates between 6 Aug. and 24 Dec. at 2 sites on the N. coast of New South Wales, Broadwater with a high (1396 mm) and Casino with a medium (1070 mm) mean annual rainfall. DM response usually increased with later fertilizer application dates because of increasing temp., but for any 2 application dates variation around the median DM response was largely determined by variation in the water supply. Such variation was generally greater and more symmetrically distributed at Broadwater than at Casino. The lower rainfall at Casino reduced the response and the overall median DM response 4 and 8 wk after top-dressing was 64 and 38% resp. of that at Broadwater. Both the soil m.c. at top-dressing and the follow-up rainfall contributed to the overall water supply. Consequently there was a trend for increasing DM response with increasing soil m.c. at top-dressing

Item Type:	Article
Author Affiliation:	Dep. of Agric., Wollongbar, N.S.W., Australia 2480.
Subjects:	Atmosperic Science > Climatology Plant Production Plant Protection
Divisions:	Other Crops
Depositing User:	Mr B Krishnamurthy
Date Deposited:	29 Jun 2012 14:10
Last Modified:	29 Jun 2012 14:10
URI:	http://eprints.icrisat.ac.in/id/eprint/6337

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