Long-term effects of grain legumes on rainy-season sorghum productivity in a semi-arid tropical Vertisol

Rego, T J and Nageswara Rao, V (2000) Long-term effects of grain legumes on rainy-season sorghum productivity in a semi-arid tropical Vertisol. Experimental Agriculture, 36 (2). pp. 205-221.

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In southern and central India, farmers crop Vertisols only in the post-rainy season, to avoid land management problems in the rainy season. In 1983 ICRISAT established a long-term trial seeking to intensify cropping. The trial included intercrops, sequential crops and appropriate Vertisol management technology to allow consecutive rainy-season and post-rainy season crops to be grown. Benefits provided by legumes to succeeding rainy-season sorghum (Sorghum bicolor) were analysed in relation to a non-legume system of sorghum + safflower (Carthamus tinctorius). Rainy-season sorghum grain yield production was sustained at about 2.7 t ha-1 over 12 years within a continuous sorghum-pigeonpea (Cajanus cajan) intercrop system. With a cowpea-pigeonpea intercrop system, succeeding sorghum benefited each year by about 40 kg N ha-1 (fertilizer nitrogen (N) equivalent). Without N fertilizer application the sorghum grain yield was around 3.3 t ha-1. Legume benefits were less marked in the chickpea (Cicer arietinum)-based rotation than in the pigeonpea system, in which a 12-year build up of soil total N (about 125 µg g-1) was observed. Although sorghum benefited from this system, pigeonpea yields declined over time due to soil-borne fungi and nematodes. Wider rotations of crops with pigeonpea may help to overcome these problems, while sustaining sorghum production.

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 26 Sep 2011 03:02
Last Modified: 19 Dec 2013 03:59
URI: http://oar.icrisat.org/id/eprint/1870
Official URL: http://journals.cambridge.org/action/displayAbstra...
Acknowledgement: UNSPECIFIED
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