Comparison of models for describing weed: crop competition

2020 ◽  
Author(s):  
José Mansilla MARTÍNEZ ◽  
María Raquel Picornell BUENDÍA ◽  
Alfonso Domínguez PADILLA ◽  
José Arturo de Juan VALERO
Keyword(s):  
Crop Competition

Weed Management in Small Grains Harvested for Grain

EDIS ◽  
2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
Jason Ferrell ◽  
Gregory MacDonald ◽  
Pratap Devkota
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Chemical Control ◽  
Management Practices ◽  
Good Management ◽  
Small Grains ◽  
Crop Competition

Successful weed control in small grains involves using good management practices in all phases of production. In Florida, winter weeds compete with small grains for moisture, nutrients, and light, with the greatest amount of competition occurring during the first six to eight weeks after planting. Weeds also cause harvest problems the following spring when the small grain is mature. This 4-page publication discusses crop competition, knowing your weeds, and chemical control. Written by J. A. Ferrell, G. E. MacDonald, and P. Devkota, and published by the UF/IFAS Agronomy Department, revised May 2020.

scholarly journals Modeling the Competitive Effect of Euphorbia dracunculoides and Astragalus sp. in Zero Input Rainfed Chickpea

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
R.M. IKRAM ◽  
A. TANVEER ◽  
R. MAQBOOL ◽  
M.A. NADEEN
Keyword(s):  
Protein Content ◽  
Critical Period ◽  
Field Experiments ◽  
Seed Protein ◽  
Yield Loss ◽  
Seed Protein Content ◽  
Yield Losses ◽  
Competition Period ◽  
Crop Competition ◽  
Weed Removal

ABSTRACT: Brown chickpea (Cicer arietinum L.) is one of the two chickpea types grown in Pakistan and other countries. The critical period for weed removal in a rainfed chickpea system is an important consideration in devising weed management strategies. Field experiments were conducted in the winter season of 2011 and 2012 to determine the extent of yield loss with different periods of weed crop competition. Seven weed crop competition periods (0, 45, 60, 75, 90, 105 and 160 days after sowing - DAS) were used to identify the critical period for weed removal in rainfed chickpea. Experimental plots were naturally infested with Euphorbia dracunculoides and Astragalus sp. in both years. Individual, composite density and dry weights of E. dracunculoides and Astragalussp. increased significantly with an increase in the competition period. However, yield and yield-contributing traits of chickpea significantly decreased with an increase in the competition period. Chickpea seed yield loss was 11-53% in different weed crop competition periods. Euphorbia dracunculoides and Astragalus sp. removed 39.9 and 36.9 kg ha-1 of N, 9.61 and 7.27 kg ha-1 of P and 38.3 and 36.9 kg ha-1 of K, respectively. Season long weed competition (160 days after sowing) resulted in 19.5% seed protein content compared with 24.5% seed protein content in weed-free chickpea. A Logistic equation was fitted to yield data in response to increasing periods of weed crop competition. The critical timing of weed removal at 5 and 10% acceptable yield losses were 26 and 39 DAS, respectively. The observed critical period suggests that in rainfed chickpea, a carefully timed weed removal could prevent grain yield losses.

scholarly journals A Competitive Ratio for Quantifying Competition Between Intercrops

1980 ◽  
Vol 16 (2) ◽  
pp. 117-125 ◽  
Author(s):  
R. W. Willey ◽  
M. R. Rao
Keyword(s):  
Competitive Ratio ◽  
Competitive Ability ◽  
Maximum Yield ◽  
The Other ◽  
Competitive Balance ◽  
Crop Competition

SUMMARYA simple competitive ratio (CR) is proposed as a measure of intercrop competition, to indicate the number of times by which one component crop is more competitive than the other. Intercropping data show that this CR term could be useful in (i) comparing the competitive ability of different crops, (ii) measuring competitive changes within a given combination, (iii) identifying which plant characters are associated with competitive ability, and (iv) determining what competitive balance between components is most likely to give maximum yield advantages.

scholarly journals Crop competition in winter wheat has a higher potential than farming practices to regulate weeds

Ecosphere ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. e02413 ◽  
Author(s):  
Sabrina Gaba ◽  
Jacques Caneill ◽  
Bernard Nicolardot ◽  
Rémi Perronne ◽  
Vincent Bretagnolle
Keyword(s):  
Winter Wheat ◽  
Farming Practices ◽  
Crop Competition

scholarly journals Weed management using crop competition in the United States: A review

2017 ◽  
Vol 95 ◽  
pp. 31-37 ◽  
Author(s):  
Prashant Jha ◽  
Vipan Kumar ◽  
Rakesh K. Godara ◽  
Bhagirath S. Chauhan
Keyword(s):  
United States ◽  
Weed Management ◽  
The United States ◽  
Crop Competition

A review of weed management in wheat using crop competition

2017 ◽  
Vol 95 ◽  
pp. 38-44 ◽  
Author(s):  
Annemieke van der Meulen ◽  
Bhagirath Singh Chauhan
Keyword(s):  
Weed Management ◽  
Crop Competition

Weed management in maize using crop competition: A review

2016 ◽  
Vol 88 ◽  
pp. 28-36 ◽  
Author(s):  
Blessing Mhlanga ◽  
Bhagirath Singh Chauhan ◽  
Christian Thierfelder
Keyword(s):  
Weed Management ◽  
Crop Competition
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