Soybean-chickpea rotation on Vertic Inceptisols II. Long-term simulation of water balance and crop yields

Singh, P and Alagarswamy, G and Hoogenboom, G and Pathak, P and Wani, S P and Virmani, S M (1999) Soybean-chickpea rotation on Vertic Inceptisols II. Long-term simulation of water balance and crop yields. Field Crops Research, 63 (3). pp. 225-236. ISSN 0378-4290

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A field study was conducted on a Vertic Inceptisol during 1995-1997 seasons at the ICRISAT Centre, Patancheru, India, to study the effect of two landforms (broadbed-and-furrow (BBF) and flat) and two soil depths (shallow and medium-deep) on crop yield and water balance of a soyabean-chickpea rotation. Using two seasons experimental data, a soyabean-chickpea sequencing model was evaluated and used to extrapolate the results over 22 years of historical weather records. The simulation results showed that in 70% of years total runoff for BBF was >35 mm (range 35-190 mm) compared with >60 mm (range 60-260 mm) for flat on the shallow soil. In contrast on the medium-deep soil it was >70 mm (range 70-280 mm) for BBF compared with >80 mm (range 80-320 mm) for the flat landform. The decrease in runoff on BBF resulted in a concomitant increase in deep drainage for both soils. In 70% of years, deep drainage was >60 mm (range 60-390 mm) for the shallow soil and ranged from 10 to 280 mm for the medium-deep soil. In 70% of years, the simulated soyabean yields were >2.2 t/ha (range 2.2-3.0 t/ha) and were not influenced by landform or soil depth. In the low rainfall years, yields were marginally higher for the BBF than for the flat landform, especially on the shallow soil. Simulated chickpea yields were higher for the medium-deep soil than for the shallow soil. In most years, marginally higher chickpea yields were simulated for the BBF than for the flat landform on both soil types. In 70% of years, the chickpea yields were >0.5 t/ha (range 0.5-1.5 t/ha) for the shallow soil, and >0.8 t/ha (range 0.8-1.96 t/ha) for the medium-deep soil. Total productivity of a soyabean-chickpea rotation was >3.0 t/ha (range 3.0-4.15 t/ha) for the shallow soil and >3.45 t/ha (range 3.45-4.7 t/ha) for the medium-deep soil in 70% of years. These results showed that in most years BBF increased rainfall infiltration into the soil and had marginal effect on yields of soyabeans and chickpeas. Crop yields on Vertic Inceptisols can be further increased and sustained by adopting appropriate rain water management practices for exploiting surface runoff and deep drainage water as supplemental irrigation to crops in a watershed setting.

Item Type: Article
Subjects: Mandate crops > Chickpea
Depositing User: Library ICRISAT
Date Deposited: 22 Sep 2011 04:05
Last Modified: 08 Jun 2012 10:27
Official URL:
Acknowledgement: UNSPECIFIED
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