Models for crop parameters due to normal load of tractor and number of passes


  • Sanjay Kumar Patel Dr
  • Indra Mani Division of Agril. Engg., ICAR-IARI, New Delhi, India
  • Pankaj Gupta Professor & HoD, FMPE, CAET, AAU, Godhra, India
  • Akhilendra P. Srivastava Division of Agril. Engg., IARI, New Delhi, India
  • Prem K. Sundaram ICAR-RCER, Patna, Bihar, India


Sub-soil compaction, Wheel trafficking, Normal load, Yield and crop model


Multiple passage of power machinery system particularly heavy machines with high wheel loads creates sub-soil compaction which results into increasing in soil bulk density & penetration resistance and reduction in water infiltration, crop germination, growth as well as yield. This study was conducted to determine the different crop growth and crop yield models could be developed to predict growth as well as yield of crop considering normal load and number of passes of tractor. A 36-plot experiment consisting of 12 treatments with three replications were set up using a randomized block design in a uniform field of Division of Agricultural Engineering, IARI, New Delhi during the period of 2007-08. Prediction models were developed between compaction parameters (normal loads and number of passes) and crop parameters like (a) plant height, (b) number of plants per meter, and (c) yield. In, other models a relation between crop yield and sub-soil bulk density and penetration resistance were established and their sensitivity analysis was done for developed models. The best fit model for plant height and number of plants per meter row was quadratic. However, the best fit model between yield vs soil bulk density and yield vs penetration resistance was exponential and quadratic, respectively. The developed model is not more sensitive for number of plants per meter row and yield vs soil bulk density. However, model was more sensitive to plant height model and yield vs soil penetration resistance is more sensitive.

Author Biographies

Sanjay Kumar Patel, Dr

Farm Machinery and Power Engineering

Indra Mani, Division of Agril. Engg., ICAR-IARI, New Delhi, India

Head of Division






I-Land and Water Engineering