STUDY OF RELATIONSHIP BETWEEN NATURAL WEED POPULATION DENSITIES AND WINTER CROPS SEQUENCE ON WHEAT PRODUCTIVITY. | ||||
| Journal of Plant Production | ||||
| Article 3, Volume 27, Issue 11, November 2002, Page 7215-7224 PDF (12.32 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.257024 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| I. M. Shrief,; A. N. M. Nassar | ||||
| Weed Research Central laboratory, Agrlc., Res., Center, Giza, Egypt. | ||||
| Abstract | ||||
| Three field experiments in 1998/1999 and 199912000 winter seasons were carried out at EI·Gimmeza Agricultural Research Station, El-Gharblea Governorate to estimate yield losses due to weed competition as well as to the role of preceding winter crops and preceding weed control treatments in wheat on weeds and wheat productivities. Polynomial regression was carried out to correlate the number and weight of total weeds/m2 to wheat productivities. Results indicate that 50 weedlm2 at one month from sowing decreased number of spikes by 5.4% and wheat production by 6.7% compared to the weed free treatment. meanwhile, 100 weed specieslm2 decreased number of spikes and wheat productivity by 14.6 and 14.0%, respectivelY2 compared to the weed free treatment. Results showed that one-kilogram of weedsl m decreased wheat yield by 24.0% compared to the weed free treatment. Preceding winter crops or preceding weed control treatments can playa role in decreasing weed population in succeeding wheat where Clover as a forage crop accounted for the significant reduction in fresh weight of broad-leaved and grassy weeds by 58.7and 39.1%, respectively, and increased wheat grain yield by 156.7% compared to untreated check. Preceding weed control treatments by isoproturon at rate of 1.25 Ufed. with one hand weeding after 45 days from sowing reduced significantly fresh weight of annual broad-leaved and grassy weeds by 42.7 and 54.3%, respectively and increased yield of wheat by 83.0% compared to check. Thus, it is recommend to take in consideration the role of preceding clover and preceding weed control treatments in wheat for improving production. | ||||
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