Adu-Gyamfi, J J and Ito, O (1997) Nitrogen Management in Sorghum/Pigeonpea Intercrop. In: Extending nitrogen fixation research to farmers' fields: proceedings of an International Workshop on Managing Legume Nitrogen Fixation in the Cropping Systems of Asia, 20-24 Aug 1996, ICRISAT Asia Center, Patancheru, Andhra Pradesh, India.
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Abstract
Conriderable gaps remain in our undmtanding of the extent to which nitrogen IN) fertilizer application in cereal/legume intercropping sytems could be synergistic in term of maximizing biological nitrogm fixation (BNF) by the le. gurne, and optimizing grain yield of the cereal component. There is a high potential to inneuse the grain yield of ~orghuma nd enhance BNF by pigeonpea through intercropping, without greatly innearing the use of fertilizer N. This review suggesrs thut: ( I ) Medium-durotion pigeonpea can reduce t k Kr; ferrtlization needs of sorghum bv 50% in a sorghum/pigeonpea intercrop. (2) Split- &&? of modest N rates is a sound strategy to increme X-use efficienq, and to enhance BNF by pigeonpea in the semi-arid tropics. This is because of the k t yr a i t~ha t a no cwr at the owet ofthe rainy season, leading to a substantbl downward water Pou, coupled with the innensed chance of water deficits during the growing searon. (3) In areas where soil mineral ?\: is relaricely high so as to suppress BNF by legumes, interrropping cereals with legumes is rtital to reduce the inhibitoh. effects of soil Tu' on BNF. This is supported by the experimental evidence that starter doses of 20-25 kg N ha.' suppressed BNF by sole-cropped, but nor ~nterc~oppepdi geonpea. (4) lnternopped legumes removed less N from the soil than their respectitle sole crops, suggesting the potential of reducing N mrning from rhr soil through interflopping. (5) For more efficient use of X b> interflopping sperm, companion naps that exhibit different root system architecture are vi:al to prevent competition for uutrr and N by roots
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Divisions: | UNSPECIFIED |
| CRP: | UNSPECIFIED |
| Subjects: | Mandate crops > Pigeonpea Mandate crops > Sorghum |
| Depositing User: | Library ICRISAT |
| Date Deposited: | 03 Dec 2011 12:43 |
| Last Modified: | 03 Dec 2011 12:43 |
| URI: | http://oar.icrisat.org/id/eprint/4769 |
| Acknowledgement: | UNSPECIFIED |
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