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Weed competes with crops for water,
nutrients and light so weed infestation is one of the major threats to crop.
Present investigation was aimed to asses the comparative efficacy of different
herbicides for weed management in wheat crop under agro-climatic conditions of
Pakistan. This experiment was laid
out in a randomized complete block design (RCBD) design with five replications.
Different herbicides were used for weed management in wheat crop. The post emergence application of
herbicides included Aim 40 DF @ 0.02 kg a.i. ha-1, Agritop 500 GL-1 @ 0.43 kg a.i. ha-1, Isoproturon 50 WP @ 1 kg a.i. ha-1, Puma super 75 EW @ 0.75 kg,
Topik 15 WP @ 0.04 kg and Buctril super 60 EC @ 0.45 kg. For
comparison hand weeding and weedy check were also included. In each replication
six treatments of these six herbicides were kept. The significantly affected parameters were fresh weed biomass (kg·ha-1), thousand grain weight (g), number of
tillers m-2, weed
control efficiency (%) and grain yield (kg·ha-1). Statistical analysis showed that maximum weed efficiency (84%) was
recorded for Isoproturon 50 WP whereas minimum value (37%) was for Aim 40 DF.
Similarly maximum number of tillers m-2 (250) was recorded for
Isoproturon 50 WP and minimum (133) in weedy check. The herbicide Isoproturon 50 WP @ 1.0 kg a.i. ha-1 was applied at post emergence performed well
and exhibited effectively weed control and better yield in wheat.
It is proved here that if a planar graph has maximum
degree at least 6 and any 6-cycle contains at most one chord, then it is of