ISHS Acta Horticulturae 367: VI International Symposium on Pear Growing
CHEMICAL WEED CONTROL IN PEAR ORCHARDS OF NORTHERN INDIA |
| Authors: | P.P.S. Minhas, D. Singh, A.S. Sandhu, S.S. Mann |
| Abstract:
The investigations on chemical weed control in pear (Pyrus pyrifolia (Burm) Nakai) cv. Patharnakh were conducted during the year 1990–91 in the Research Orchard of Punjab Agricultural University, Ludhiana. The herbicides, viz., atrazine @ 0.75+1.0+1.0, 1.25+1.5+1.5, 1.75+2.0+2.0, 2.0+2.5+2.5 and 2.5+3.0+3.0 and diuron @ 0.8+1.6+1.6, 1.6+2.4+2.4, 2.4+3.0+3.0, 3.0+3.6+3.6 and 3.6+4.2+4.2 kg a.i. ha-1 were applied as pre-emergence, whereas glyphosate @ 0.4+0.8+0.8, 0.8+1.2+1.2, 1.2+1.6+1.6, 1.6+2.0+2.0 and 2.0+2.4+2.4 l ha-1 was applied as post-emergence herbicide. All the herbicides were sprayed thrice a year, i.e. during fall, spring and summer and were compared with traditional hand weeding and control. The herbicides significantly reduced weed population and dry matter content of the weeds. Weed control efficiency was inversely proportional to dry matter accumulation. The higher doses of each herbicide were most effective in controlling both monocot and dicot weeds. There was significant improvement in fruit size, fruit weight, juice percentage, total soluble solids, acidity and total sugar content under all the herbicidal treatments as compared to control. The maximum improvement was recorded under cumulative dose of glyphosate @ 6.8 and 4.4 l ha-1, respectively. The cumulative dose of glyphosate @ 4.4 l ha-1 year-1 as post-emergence was found to be the most economical herbicide in controlling weeds in pear orchard. | |
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