1Indian Agricultural Statistics Research Institute, Pusa, New Delhi-110012%. e-mail: akumar@iasri.res.in
2Indian Council of Agricultural Research, Krishi Bhawan, New Delhi-110014
3Project Directorate for Farming Sysyems Research, Modipuram, Meerut, 250110
4Central Potato Research Stations, Modipuram, Meerut, 250110
A long-term experiment was initiated Under All India Co-ordinated Research Project on Cropping Systems during 1977–2003 to study the long range effect of a crop sequence with high yielding varieties at graded fertilizer levels on yield stability and soil fertility. Under this broad objective a study was undertaken to predict and estimate the grain yield based upon best fitted linear/nonlinear models. For all the nineteen treatments, linear/nonlinear models was being fitted to obtain the estimated yield as well as predicted yield for further three years. This paper presents linear/nonlinear models for the estimation of grain yield over time and discusses the results of applying these models to grain yield values under RWCS from LTE.
