000			03144nab a2200361 i 4500
003			BR-BrBNA
005			20230921160341.0
008			230808b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60 _b0120
100			_aRehman, A.
100			_aQamar, R.
100			_aSafdar, M.E.
100			_aAtique-ur-Rehman
100			_aJaveed, H.M.R.
100			_aMaqbool, R.
100			_aFarooq, N.
100			_aShahzad, M.
100			_aAli, M.
100			_aTarar, Z.H.
245			_aCritical competition period of Parthenium hysterophorus L. in spring maize (Zea mays L.)
500			_aPublicação on-line; 43 ref. 4 tables; 3 illus.; Summary (En)
520			_a ABSTRACT Background: Parthenium hysterophorus L., commonly known as parthenium weed, poses severe economic and environmental hazards to the agro-ecosystems of Pakistan. Objective: To estimate the yield loss and critical competition period of this weed in the spring sown maize crop. Method: Field studies were conducted at an agronomic research area in the College of Agriculture at the University of Sargodha in PunjabPakistan during two consecutive year spring seasons (2014 and 2015). Treatments were comprised of viz., control plots (weed free), and parthenium competition durations of 2, 3, 4, 5 and 6 weeks after crop emergence (WAE), as well as weedy check for the full growing season of the crop. Results: Study results showed that the prolongation in parthenium competition duration from 2 WAE to the full crop season resulted in an increase in dry weight up to 541% and 450% in the years 2014 and 2015, respectively. Plant height, stem diameter, biological yield, 1000 grain weight and grain yield decreased significantly at 2 or more WAE parthenium competition periods. The maximum reduction in plant height (8.8 and 11.3%), stem diameter (30.6 and 12.7%), cob number m-2 (35.8 and 33.9%), grain rows cob-1 (26.6 and 29.4%), 1000 grain weight (15 and 9.8%), grain (34.1 and 39.1%) and biological yield (31.4 and 27.9%) were recorded with the longest parthenium competition duration (6 WAE) during the years 2014 and 2015, respectively. Conclusion: Based upon the results above, it is concluded that the critical competition period of parthenium in spring maize, as determined by a three-parameter logistic model, is 17 to 28 and 16 to 26 days after crop emergence during the years 2014 and 2015, respectively. Therefore, this weed must be controlled during these periods in order to avoid significant grain yield loss. Keywords: competition duration parthenium spring maize yield loss logistic model.
650			_aERVA DANINHA
650			_aZEA MAYS
650			_aMILHO
650			_aPERDA
650			_aRENDIMENTO
773	0		_0886 _91817 _dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978 _o2023-031024 _tPlanta Daninha (Brazil) _x0100-8358; 1806-9681 (on-line) _gv. 38 p. 1-9; (2020) _wBR2023000850
856			_uhttps://www.scielo.br/j/pd/a/ZStZLB4zG3w6sKdLgxqBVMp/?format=pdf&lang=en
942			_cAnalítica
999			_c9764 _d9764