The critical period for Weed Competition in Relation to Fibre Yield of Jute (Corchorusolitorius L.)
Abstract
Field experiment was carried to determine the critical time for weed competition in jute (Corchorus olitorius L.). Two set of treatments were applied in one set weeds were allowed to infest the crop and in second set crop was kept weed free for an increasing duration of time i.e.10,20,30,40,50 days after sowing (DAS) and up to harvest The beginning and the end of critical period of weed competition, were determined by fitting logistic and Gompertz equations, respectively. A total of 11 weed species were observed in experimental field, Grass weeds this Eleusine indica was the dominant with relative density of 32.9 % followed by Echinochloa colona (16.5 %). The reduction in fibre yield was recorded to be 74% when weed interference allowed up to harvest as compared to weed free period. The minimum days or start of critical period was 7 DAS which was calculate using logistic equation and end of critical period/time for weed free period was 42 DAS, which was calculated using Gompertz equation.References
Evans SP, Knezevic SZ, Lindquist JL, Shapiro CA and Blankenship EE. 2003. Nitrogen application influences the critical period for weed control in corn. Weed Science 51: 408–417.
Ghorai AK, Rajib De and Chowdhury H, Majumdar B, Chakraborty A and Kumar M. 2013. Integrated management of weeds in raw jute. Indian Journal of Weed Science 45 (1): 47-50.
Gogai AK and Kalita H. 1992. Crop weed competition in capsularis jute. Indian Journal of Weed Science 24 (2&3):74-76.
Hall MR, Swanton CJ and Anderson GW. 1992. The critical period of weed control in grain corn (Zea mays). Weed Science 40:441–447.
Knezevic SZ, Evans SP, Blankenship EE, Van Acker RC and Lindquist JL. 2002. Critical period for weed control: the concept and data analysis. Weed Science 50: 773–786.
Kumar P, Singh O and Ahlawat IPS. 2014. Weed dynamics, growth and yield of wheat crop as influenced by different tillage and herbicide management under rice-wheat cropping system. Journal of AgriSearch1(3): 161-167.
Lindquist JL, Mortensen DA and Westar P. 1999. Stability of corn (Zea mays) and foxtail (Setariaspp) interference relationships. Weed Science47: 195-200.
Martin SG, Van Acker RC, Friesen LF. 2001. Critical period of weed control in spring canola. Weed Science49:326-333.
Rao AN and Nagamani A. 2010 Integrated Weed Management in India–Revisited I. Indian Journal of Weed Science42 (3 & 4): 123-135.
Singh P, Singh L, Singh P, Lone BA, Qayoom S, Ahmad L, Ganai MA, Kanth RA and Fayaz A. 2015. Response of lentil (Lens culinaris Medik) and weeds to different weed management practices under temperate conditions. Journal of Agrisearch2 (1): 72-74.
Swanton CJ and Weise SF. 1991. Integrated weed management: The rationale and approach. Weed Technology. 5: 657–663.
