PJB-2018-265
GROWTH DYNAMICS OF MAIZE (Zea mays L.) AND WEEDS IN RESPONSE TO DIFFERENT NITROGEN LEVELS AND WEEDING INTERVALS
Muhammad Saeed
Abstract
Field study was carried out during summer season 2014 and was repeated in 2015 at The University of Agriculture Peshawar farm. The design of the experiment was RCBD with split plot arrangement having three replications. An open pollinated maize variety “Azam†was used in the experiment. Four nitrogen levels (N0=0, N1=100, N2=150, and N3=200 kg ha-1) were applied to the main plots while seven weeding intervals (W0=Weed free throughout season, W1=15 DAS (days after sowing), W2=30 DAS, W3=45 DAS, W4=60 DAS W5=75 DAS, W6= weed infested throughout season) were applied to sub plots. In all sub plots weeds competed with maize for the above mentioned days and were then kept free for the rest of duration through regular hand weeding. Experimental data illustrated highest plant height (220.7 cm), biological yield (10189 kg ha-1) and grain yield (6268 kg ha-1) from the N @ 200 kg ha-1treated plots.. Furthermore, those plots which were kept weed infested up to 30 days caused severe yield losses. However, beyond 60 days after sowing no significant reduction was noticed in most of the yield related parameters. So it is recommended that weeding should be done before 30 DAS having nitrogen @ 200 kg ha-1 for enhancing grain yield in maize crop.
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