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Response to fertilizer nitrogen and water of post-rainy season sorghum on a Vertisol. 1. Biomass and light interception

OAR@ICRISAT

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Relation http://oar.icrisat.org/1733/
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7229
 
Title Response to fertilizer nitrogen and water of post-rainy season sorghum on a Vertisol. 1. Biomass and light interception
 
Creator Rego, T J
Monteith, J L
Singh, P
Lee, K K
Nageswara Rao, V
Srirama, Y V
 
Subject Sorghum
 
Description Sorghum cv. SPH-280 was grown in the post-rainy season at ICRISAT (Andhra Pradesh, India) with and without irrigation and at six rates of nitrogen from zero to 150 kg/ha applied before sowing. The biomass of top components was measured weekly and of roots every 2 weeks. Interception of solar radiation was monitored continuously in all treatments. Leaf expansion was strongly influenced both by water and by N, whereas specific leaf area was almost independent of treatment. In the irrigated treatment, the Biomass Radiation Coefficient (e) for the main growth period was almost independent of N application at 1.3-1.4 g/MJ and was also independent of leaf N. In consequence, the main source of differences in yield was a decrease in radiation interception with decreasing N. In contrast, without irrigation, biomass, yield, e and leaf N were all maximal at 60 kg/ha N. At 33 days after emergence (DAE), root mass was almost independent of N whether water had been applied or not, but was somewhat smaller with irrigation. Later, root, leaf, and panicle mass all responded to N and to water, but stem mass was unresponsive to N with irrigation. There was evidence of translocation from stem to grain in most treatments. With irrigation, a maximum grain yield of 4.8 t/ha was obtained at 150 kg/ha N and without irrigation the maximum was 3.2 t/ha at 90 kg/ha.
 
Publisher Cambridge University Press
 
Date 1998
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1733/1/JAgriSci131%28417-428%29_1998.pdf
Rego, T J and Monteith, J L and Singh, P and Lee, K K and Nageswara Rao, V and Srirama, Y V (1998) Response to fertilizer nitrogen and water of post-rainy season sorghum on a Vertisol. 1. Biomass and light interception. The Journal of Agricultural Science, 131 (4). pp. 417-428.