ANALYSIS OF WHEAT CROP PARAMETERS UNDER ALLELOPATHIC WITH REDUCED DOSE OF HERBICIDE APPLICATION

Abstract

Water extracts from allelopathic plants like sorghum, sunflower and brassica especially when it is used in combination with reduced dose of herbicides. A field experiment was carried out to examine the feasibility of using sorghum water extract as a natural weedicide in rabi season crop (wheat) during 2015-2016 at Agronomy Research Form, Sorgaab sprays with three different concentration (1:3, 1:4,1:5) in combination with Weedicide (affinity) in three different levels (1/3,1/2 and 2/3 of the recommended dose), with three application timing (emergence, tillering, 50% at emergence and 50 % at tillering), were tested and compared with hand weeding, unweeded and with weedicide sole. Results of the study showed that the herbicide sole followed by hand weeded plots were more effective among all the treatments for controlling weed dry weight increased grain yield. Sorghum extract sprayed at 1:5 resulted in decreased dry weight (127.2 g m-2), more leaf area tiller-1 (101 cm2), more leaf area index (3.0) and higher grain yield (3727 kg ha-1). Herbicide (affinity) at the rate of 1317g ha-1 and increased leaf area tiller-1 (100 cm2), leaf area index (2.9) and higher grain yield (3665 kg ha-1). Sorghum extract concentration with combination sprayed at tillering stage gave reduced dry weight (132), increased leaf area tiller-1 (99 cm2), more leaf area index (2.9) and grain yield (3727 kg ha-1). It is concluded that sorghum extract concentration 1:5 with 1317g ha-1 of herbicide affinity applied at tillering stage is recommended for higher yield and yield components of wheat crop.