A field experiment was conducted for two consecutive years to estimate the uptake of NPK by Trianthema
portulacastrum (Itsit) in cotton. N @170 kg ha-1 was applied in three splits. Six weed control treatments
were: two hoeings at 3 and 6 weeks after sowing (WAS); one hoeing at 3 WAS + one earthing-up at 6
WAS; S. metolachlor @ 2.4 kg a.i. ha-1 pre-plant incorporation (PPI); S. metolochlor @ 2.4 kg a.i.ha-1
PPI + one hoeing at 6 WAS and S. metolochlor @ 2.4 kg a.i. ha-1 PPI + one earthing-up at 6 WAS; along
with a weedy check. Effect of split application of N and weed control methods on NPK concentrations in
Itsit was non-significant but significant on uptake of NPK. Maximum nutrient uptake by Itsit was 36.16 kg
ha-1 N, 7.79 kg ha-1 P and 41.57 kg ha-1 K in the weedy check. S. metolochlor @ 2.4 kg a.i.ha-1 with one
earthing up at 6 WAS performed best in reducing the dry weight and NPK uptake by Itsit. Although the
concentration of NPK in the weed was non-significant but uptake was significant mainly due to rapid
growth and more dry matter accumulation during short available chance of growth period.
F.H. Anjum, A. Tanveer, M.A. Nadeem, M. Tahir, A. Aziz. (2007) Effect Of Split Application Of Nitrogen And Integrated Weed Management On Nutrient Uptake By Trianthema Portulacastrum (Itsit) In Cotton, , Volume-44, Issue-3.
