Phenological development and weeds dry matter production in canola asaffected by pre and post emergence herbicides and row spacing
2003
Amin, R.,NWFP Agricultural Univ., Peshawar (Pakistan). Dept. ofAgronomy
An experiment was conducted at Agricultural Research Farm of NWFPAgricultural University, Peshawar during 2000-01 to study the effect of rowspacing and different levels of Stomp 330 E and Puma super as pre and post-emergence herbicides on canola. Crop was sown according to randomizedcomplete block design with split plot arrangement replicated four times, usingthree row spacings (30, 45, 60 cm) and three levels of Stomp 330 E (1.75, 2.75,3.75 L ha-1) as pre-emergence and three levels of Puma super (1, 2 3 L ha-1)as post-emergence herbicides. Row spacing had non significant effect on allthe parameters except 50% flowering. Minimum (102.37) days to 50% floweringwere recorded for 45 cm apart rows. Weed control methods had a significanteffect on all the parameters studied. Lightest weeds weight at 30 cm height(12.87 g m2) was obtained from plots receiving 2 L Puma ha-1 while minimumweeds weight at flowering (15.42 g) was recorded from plots receiving 3.75 LStomp ha-1. Minimum (101.42) days to 50% flowering were noted for plotstreated with Stomp 3.75 L ha-1 while, minimum (163.17) days to maturity wererecorded for Stomp 2.75 L ha-1. Maximum plant height (1.55 m) and number ofbranches plant-1 (8.42) were recorded at Stomp 3.75 L ha-1. It was concludedthat Stomp 330E at the rates of 2.75 and 3.751 ha-1 as pre- emergencefollowed by Puma super at the rate of 2 L ha-1 as post- emergence were themost effective herbicides for weed control in canola.
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