Determination of Critical Period of Weed Control in Kala Zeera (Buniumpersicum Bios) in Gurez Valley of Kashmir
Abstract
Critical Period of Weed Control (CPWC) is the period in crop growth cycle during which weeds must be controlled to prevent unacceptable yield losses.Two sets of treatments were imposed to represent both increasing duration of weed interference and the length of the weed-free period measured after germination. The first set of treatments consists of increasing duration of weed interference by delaying weed control from the time of crop emergence up to predetermined
week (weedy up to 2,4,6,8,10 and 12 weeks after germination (WAG) of Kala Zeera) . The second set of treatments established six levels of increasing length of the weed-free period (weed free upto 2, 4,
6, 10 and 12 WAG). Besides two controls (Weed free and weedy check). These comprised of 14 treatments which were laid out in randomized complete block design with three replication. It was
revealed that variation inKala zeera seed yield due to weeds is upto 88% and yield gets reduced as low as 48 % in weedy check plots. Early weed competition does not have have profound influence
in Kala zeera crop.According to average data of two years investigation, it was concluded that Weeds emerging between 6-12 WAG appear to be most detrimental to Kala zeera growth and yield
and hence qualifies critical stage for weed competition.
References
Cardina J, Regnier, E, Puettmann KJ. 1995. Using plant volumes to quantify interference in corn (Zea mays.) neighbourhoods. Weed Science. 41:594-599
Dieleman M, Hamill AS, Fox GC, Swanton CJ. 1996. Decision rules for post emergent control of pigweed (Amaranthus spp.) in soybean (Glycine max). Weed Science 44: 126-132
Hall, MR, Swanton, CJ, Anderson GW.1992. Critical period of weed control in grain corn(Zea mays). Weed Science. 40: 441-447
Kropff, MJ and Spitters, C. J. T 1992. An ecophysiological model of interspecific competition applied to the influence of chenopodium album L on sugarbeat 1. Model description and parameterization. Weed Research .32: 437-450
Lindquist, JI and Mortensen, DA and Westra P. 1999. Stability of corn (Zea mays)-foxtail (Setaria spp.) interference relationships. Weed Sci. 47: 195-200
Nadeem MA, Tanveer A, Naqqash T, Jhala AJ, and Mubeen K. 2013. Determining weed competition period for Black Seed. The Journal of Animal and Plant Sciences. 23(1):216-221
Panwar, K. 1992. Kala Zeera: A low volume, high price crop for dry temperate hills. Indian Farmers Digest 25(11):21-23
Swanton CJ, Nkoa R, and Blackshaw RE. 2015. Experimental methods for crop- weed competition studies. Weed Research.63: 2-11
Weaver SE, And Tan CS. 1987. Critical period of weed interference in transplanted tomatoes and its relation to water stress and shading. Canadian Journal of Plant Sciences. 67:575–583
