Correlation analysis of growth, yield and yield components of wheat (Triticum aestivum) under varying weed densities

RAMANJIT KAUR; MANPREET JAIDKA; P K KINGRA

doi:10.56093/ijas.v87i6.70951

Authors

RAMANJIT KAUR ICAR-Indian Agricultural Research Institute, New Delhi 110 012
MANPREET JAIDKA ICAR-Indian Agricultural Research Institute, New Delhi 110 012
P K KINGRA ICAR-Indian Agricultural Research Institute, New Delhi 110 012

https://doi.org/10.56093/ijas.v87i6.70951

Keywords:

Correlation matrix, Crop growth rate, Heat units, Malva neglecta, Rumex spinosus, Wheat, Yield

Abstract

A study was carried out at Student's Farm, Department of Agronomy, Punjab Agricultural University, Ludhiana during rabi 2010-11 and 2011-12. The experimental site was sandy loam, with normal soil pH and electrical conductivity, low in organic carbon and available N and medium in available P and K. The investigation consisted of 11 treatments each having different population levels of button weed (Malva neglecta) and kandyali palak (Rumex spinosus), viz 0,3,6,9,12 plants/m² and two treatments having pure populations of each weed. Wheat crop accumulated more heat units (AGDD, AHTU, APTU) during the year 2011-12 as compared to the crop year 2010-11. Increase in population levels of both weed species significantly decreased the crop growth rate (CGR) and relative growth rate (RGR) of wheat crop. The results showed a significant decrease in number of tillers, effective tillers, number of grains/ear, 1 000-grain weight and grain yield of wheat with increasing population densities of Malva neglecta and Rumex spinosus (from 3 to 12 plants/m²). Highest grain yield of wheat (57.54 q/ha) was recorded under pure wheat treatment and lowest grain yield was recorded in treatments T₅ and T₁₀ having 12 plants of Malva neglecta and Rumex spinosus, respectively. Highest heat use efficiency (HUE) was recorded in pure wheat treatment in contrast to all other treatments. Determination of correlation matrix revealed that crop yield was perfectly negatively correlated with population densities of Malva neglecta and Rumex spinosus while there was highly significant direct relationship with other crop growth parameters like dry matter accumulation, LAI, tiller number/m², effective tillers/m², ear length, and number of grains/ear etc. Regression analysis interpreted positive relation of grain yield with growth parameters and negative with both weed population densities. From the study it was concluded that higher weed infestation enhances inhibitory influence on the growth rate, heat use efficiency and yield of wheat crop.

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