Author(s) Prabhakar Pathak^*, Suhas P. Wani, Raghavendra Sudi, Nagaraju Budama

Affiliation(s)
Resilient Dryland Systems, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India;.

ABSTRACT

In the semi-arid tropics (SAT),33% areas are occupied by Alfisols and related soils. In SAT these soils have low structural stability and thereby tend to form seal and crusts at the surface. Due to this a large proportion of the rain that falls on Alfisols during the early part of the rainy season,is normally lost as runoff thus causing high soil loss as well as moisture stress to crops. Two tillage studies were conducted first at plot scale (320 m²) during 1991-95 and second at small watershed scale (1.45 ha) during 2007-10,at ICRISAT research station,Hyderabad,India. These studies were conducted to find out whether the problem of excessive runoff and soil loss during the early part of the rainy season can be controlled by various inter-row tillage systems in addition to normal intercultivation by breaking the crust or seal and thereby improving infiltration and soil moisture and reducing runoff and soil loss. The observations on rainfall,runoff,soil moisture,soil loss,soil surface roughness and crop yields were collected from both the studies. Results from these studies have shown that inter-row tillage in addition to normal intercultivation is found effective in controlling early season runoff and soil loss and increasing crop yields. The additional tillage systems are found most effective during low and medium rainfall years and not so much during high rainfall years. The additional tillage with shoe cultivators,which creates rough soil surface (11 mm depression storage),is found most effective in increasing crop yields and reducing runoff and soil loss. The additional tillage with blade harrow which generates smooth soil surface is relatively less effective. In most rainfall conditions,the normal intercultivation with one additional tillage is found adequate for controlling early season runoff and improving soil moisture and crop yields.

KEYWORDS
Runoff; Soil Loss; Crusting; Sealing; Semi-Arid Tropics; Alfisols; Soil Surface Roughness

Cite this paper
Pathak, P. , Wani, S. , Sudi, R. and Budama, N. (2013) Inter-row tillage for improved soil and water conservation and crop yields on crusted Alfisols. Agricultural Sciences, 4, 36-45. doi: 10.4236/as.2013.48A006.

References
[1]   Hussein, M.H., Awad, M.M. and Abdul-Jabbar, A.S. (2010) Effect of surface crust on rainfall infiltration in an Aridisoil in northern Iraq. European Water, 32, 25-34.

[2]   Philip, J.R. (1998) Infiltration into crusted soils. Water Resources Research, 34, 1919-1927. doi:10.1029/98WR01207

[3]   Cary, J.W. and Evans, D.D. (1974) Soil crusts. In: Cary, J.W. and Evans, D.D., Eds., Technical Bulletin, University of Arizona, Agricultural Experiment Station, Tuscon, 58 pp.

[4]   Assouline, S. (2004) Rainfall-induced soil surface sealing: A critical review of observations, conceptual models and solutions. Vadose Zone Journal, 3, 570-591. doi:10.2113/3.2.570

[5]   Assouline, S. and Mualem, Y. (2003) Effects of rainfallinduced soil seals on the soil water regime: Drying intervals and subsequent wetting. Transport in Porous Media, 53, 75-94. doi:10.1023/A:1023583808812

[6]   Tarchitzky, J., Banin, A., Morin, J. and Chen Y. (1984) Nature, formation and effects of soil crusts formed by water drop impact. Geoderma, 33, 135-155. doi:10.1016/0016-7061(84)90025-9

[7]   Valentin, C. and Bresson, L.M. (1992) Soil crust morphology and forming processes in loamy and sandy soils. Geoderma, 55, 225-245. doi:10.1016/0016-7061(84)90025-9

[8]   Wakindiki, I.I.C. and Ben-Hur, M. (2002) Soil mineralogy and texture effects on crust micromorphology, infiltration and erosion. Soil Science Society of America Journal, 66, 897-905. doi:10.2136/sssaj2002.0897

[9]   El-Swaify, S.A., Walker, T.S. and Virmani, S.M. (1984) Dryland management alternatives and research needs for Alfisols in the semi-arid tropics. Consultant’s Workshop on the State of the Art and Management Alternatives for Optimizing to Productivity of SAT Alfisols and Related Soils, ICRISAT Center, 1-3 December 1983, 44 pp.

[10]   Pathak, P., Sudi, R., Wani, S.P. and Sahrawat, K.L. (2013) Hydrological behavior of Alfisols and Vertisols in the semi-arid zone: Implications for soil and water management. Agricultural Water Management, 118, 12-21. doi:10.1016/j.agwat.2012.11.012

[11]   Stolte, J., Ritsema, C.J. and Roo, A.P.J. (1997) Effects of crust and cracks on simulated catchment discharge and soil loss. Journal of Hydrology, 195, 279-290. doi:10.1016/S0022-1694(96)03249-0

[12]   Pathak, P. and Sudi, R. (2004) Manual of operation and instruction: Microprocessor-based automatic sediment sampler. Global Theme on Agroecosystems, ICRISAT, Patancheru.

[13]   Pathak, P., Laryea, K.B. and Sudi, R. (1989) A runoff model for small watersheds in the semi-arid tropics. Transactions of the ASAE, 32, 1919-1624.

[14]   Ritchie, J.T. (1998) Soil water balance and plant water stress. In: Tsuji, G.Y., Hoogenboom, G. and Thornton, P.K., Eds., Understanding Options for Agricultural Production, Kluwer Academic Publishers, London, 41-54. doi:10.1007/978-94-017-3624-4_3