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Standardizing weed sampling procedures in transplanted rice.

Author(s)
M. Inayat Khan National Agricultural Research Centre (NARC), Islamabad, Pakistan
Naseer A Khan National Agricultural Research Centre (NARC), Islamabad, Pakistan
Abdul-Ghafoor National Agricultural Research Centre (NARC), Islamabad, Pakistan
R. A. Shad National Agricultural Research Centre (NARC), Islamabad, Pakistan
Abstract
The weed population in transplanted rice was estimated using various sampling frequencies and quadrat sizes and numbers. No functional relationship was determined between the quadrat size, quadrat number and coefficients of variation (CV) of weed data. When quadrat size was increased from 25 cm x 25 cm to 50 cm x 25 cm substantial decrease in the coefficient of variation was noticed when weeds were sampled at 30 days after tansplanting. The coefficients of variation (CV) of weed weight were found higher as compared to CVs of weed density for different quadrat sizes and quadrat numbers. The results show that at least one 25 cm x 50 cm quadrat per plot was necessary for weed population studies. Grasses and sedges must be sampled at 30 days after transplanting (DAT) whereas broadleaf weeds may be sampled at 90 DAT with two quadrats of 25 cm x 50 cm.
Publication Details
Page(s) 48-53
DOI DOI not available
Published Journal: Pakistan Journal of Weed Science Research, Volume: 3, Issue: 1, Year: 1990

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