Length to weight ratio of chickpea roots under progressively receding soil moisture conditions in a Vertisol

Krishnamurthy, L and Ito, O and Johansen, C and Saxena, N P (1998) Length to weight ratio of chickpea roots under progressively receding soil moisture conditions in a Vertisol. Field Crops Research, 58 (3). pp. 177-185.

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Experiments were conducted in a Vertisol near Patancheru, Andhra Pradesh, under decreasing soil moisture conditions with five chickpea (Cicer arietinum) genotypes during the 1992-93 and 1993-94 post-rainy seasons. Roots were sampled at 14-day intervals using a monolith method. Changes in length-to-weight ratio (LWR) across genotypes, in general, were not significant as the genotypes had similar growth duration. With increasing age, root LWR declined gradually in the 0-10 cm depth and remained nearly unchanged in the 10-30 cm soil layer. It showed an apparent increasing trend at 30-135 cm soil depths, contrary to the observations made in other crops. Between the two seasons, root LWR was the lowest at all times and depths during the relatively wet 1992-93 season. The changes in LWR with increasing soil depth exhibited lowest values at the soil surface with steep increases in the middle layers and a constant or declining pattern in deeper layers. There was a clear negative relationship between available soil moisture and LWR in the lower half of the rooting zone at all stages of crop growth in both years, a possible effect of oxygen deficiency caused by excessive soil water status. Changes in root morphology over depth indicated that poor soil aeration decreased LWR in Vertisols.

Item Type: Article
Subjects: Mandate crops > Chickpea
Depositing User: Library ICRISAT
Date Deposited: 17 Sep 2011 08:29
Last Modified: 17 Sep 2011 08:29
URI: http://oar.icrisat.org/id/eprint/1714
Official URL: http://dx.doi.org/10.1016/S0378-4290(98)00093-8
Funders: Japan International Science and Technology Exchange Center, Research Development Corporation of Japan
Acknowledgement: The senior author is grateful to the Japan International Science and Technology Exchange Center and Research Development Corporation of Japan for awarding a Science and Technology Agency Fellowship. We thank the Japan International Research Center for Agricultural Research (JIRCAS) for providing 184 L. Krishnamurthy et al. / Field Crops Research 58 (1998) 177±185 the computing facilities. We thank Dr. K. Kainuma, Director General, JIRCAS and Dr K. Minami, Director, Environmental Resources Division, JIRCAS for their interest and encouragement in this work
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