Leaf phosphorus and sorghum yield under rainfed cropping of a Vertisol

Sahrawat, K L and Rahman, M H and Rao, J K (1999) Leaf phosphorus and sorghum yield under rainfed cropping of a Vertisol. Nutrient Cycling in Agroecosystems, 54 (1). pp. 93-98.

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A field experiment was conducted at Patancheru, Andhra Pradesh in 1987-89 to study the response of sorghum cv. CSH 6 to fertilizer P (0, 10, 20 and 40 kg/ha) on a Vertisol low in extractable P. One sorghum crop was grown each year during the rainy season (June to September). Tissue samples from the newest, fully-developed leaf were collected at 50% flowering stage to establish the relationship between leaf P concentration and grain yield. During the three years, sorghum grain yield and leaf P concentration increased in response to P application up to 40 kg/ha. Leaf P concentration was linearly related to grain yield (r² varied from 0.724 to 0.993). The critical leaf P concentration at 90% of the maximum grain yield was about 0.25% P. Phosphorus content in the grain was not significantly correlated to yield.

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 21 Sep 2011 10:16
Last Modified: 05 Jan 2015 03:39
URI: http://oar.icrisat.org/id/eprint/1822
Official URL: http://dx.doi.org/10.1023/A:1009780411676
Acknowledgement: UNSPECIFIED
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