Tillage and Rice-Wheat Cropping Sequence Influences on Some Soil Physical Properties and Wheat Yield under Water Deficit Conditions

Sandeep Kumar, Pradeep K. Sharma, Stephen H. Anderson, Kapil Saroch

Carbon Management & Sequestration Center, School of Environment & Natural Resources, Ohio State University, Columbus, USA;.
Department of Agronomy, Forage and Grassland Management, CSK HPKV, Palampur, India..
Department of Soil Science, CSK HPKV, Palampur, India;.
Department of Soil, Environmental and Atmospheric Sciences, University of Missouri, Columbia, USA; 4Department of Agronomy, Forage and Grassland Management, CSK HPKV, Palampur, India..

DOI: 10.4236/ojss.2012.22011                

Abstract

Adopting a better tillage system not only improves the soil health and crop productivity but also improves the environment. A field experiment was conducted to investigate the effects of tillage and irrigation management on wheat (Triticum aestivum L.) production in a post-rice (Oryza sativa L.) management system on silty clay loam soil (acidic Alfisol) for 2003-2006. Four irrigation levels (RF: rainfed; I₁: irrigation at crown root initiation (CRI); I₂: irrigation at CRI + flowering; I₃: irrigation at CRI + tillering + flowering), and two tillage systems (ZT: zero tillage and CT: conventional tillage) were tested. Zero tillage compared to CT, resulted in higher bulk density (1.34 vs 1.23 Mg ^–3), lower total porosity (48.7 vs 52.9%), higher penetration resistance (1.51 vs 1.37 MPa), lower saturated hydraulic conductivity (1.60 vs 92.0 mm h^–1), lower infiltration rate (9.40 vs 36.6 mm h^–1) and higher volumetric available water capacity (7.9 vs 7.5%) in the surface 0.15 m soil layer. Irrigation levels significantly affected crop water use, wheat yield, and water use efficiency (WUE). Average total water use was 461, 491, 534 and 580 mm under RF, I₁, I₂ and I₃ treatments, respectively. Grain and straw yield of wheat were statistically the same under ZT and CT during 2003-2004; the values, averaged over four irrigation levels were 2.10 and 2.38 Mg a^–1 for grain, and 3.46 and 3.67 Mg a^–1 for straw, respectively. Grain yield declined by 22%, 11% and 8% of I₃ (2.32 Mg ha–1) with RF, I₁ and I₂ treatments, respectively, under ZT; and by 13%, 8% and 5% of I₃ (2.61 Mg ha^–1) with RF, I₁ and I₂ treatments under CT. Average values of WUE were 4.33 kg ha^–1 m^–1 and 2.35 m³–1 grain for the ZT and CT treatments. Wheat yield increased with increased irrigation levels for all the cropping seasons. Results from this study concluded that ZT system was better compared to the CT system even with lower yields due to lower input costs for this treatment.

Keywords

Conventional Tillage; Soil Physical Properties; Infiltration; Water Retention; Water Use Efficiency; Zero Tillage

Conflicts of Interest

The authors declare no conflicts of interest.

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