Correlation and Regression Analysis of rabi Maize - Weed Ecosystem

A field experiment was conducted at AICRP - WM, B. A. College of Agriculture, Anand Agricultural University, Anand during rabi 2019-20 and 2020-21 in lomy sand soils to study the correlation of the grain yield of maize on certain weed and crop parameters in middle Gujarat conditions. The experiment consisted ten treatments laid out in a randomized block design with three replications. After harvest, correlation and regression analysis were studied between grain yield as the dependent variable and each of the following traits as independent variables (Monocot weed density (no/m2) at 25, 50 DAS and at harvest, Dicot weed density (no/m2) at 25, 50 DAS and at harvest, Total weed density (no/m2) at 25, 50 DAS and at harvest, Monocot weed dry biomass (g/m2) at 25, 50 DAS and at harvest, Dicot weed dry biomass (g/m2) at 25, 50 DAS and at harvest, Total weed dry biomass (g/m2) at 25, 50 DAS and at harvest, Weed control efficiency at 25, 50 DAS and at harvest, Straw yield, Plant stand at 30 DAS and at harvest and Plant height at 30 DAS, 60 DAS and at harvest) The results revealed that grain yield was highly negatively correlated with density and dry biomass of weeds at 25and 50 DAS as well as at harvest in pooled analysis, while non-significant positive correlation was observed with weed control efficiency at 25 and 50 DAS but, highly significant positive correlation was found with weed control efficiency at harvest in pooled analysis. The correlation coefficient between grain yield and periodical plant height, straw yield and plant stand at harvest were highly significant positive correlation in pooled analysis, while plant stand at 30 DAS showed non-significant positive correlation.