Effect of Integrated Application of Canola (Brassica napus L.) Green Manure and Planting Density on Weeds Control and Sunflower (Helianthus annuus L.) Yield

پژوهش های حفاظت گیاهان ایران

Article 8, Volume 34, Issue 4 - Serial Number 50, March 2021, Pages 501-514   

Document Type: Research Article

DOI: 10.22067/jpp.2020.32812.0

Authors

J. Hamzei^{* 1}; H. Khani²; S.F. Hosseini³; R. Saberfar⁴

¹Associate Professor in Crop Ecology, Department of Crop Production and Plant Breeding, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran

²Master of Science in Weed Science, Department of Crop Production and Plant Breeding, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran

³Ph.D. Student Department of Crop Production and Plant Breeding, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran

⁴M.Sc. Student in Crop Ecology Department of Crop Production and Plant Breeding, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran

Abstract

Introduction: Weeds are the most important limiting factor in agricultural systems and if they are not controlled, crop yields can be reduced up to 90% depending on the competitiveness of weeds and between 10 and 100% according to some literatures. One of the benefits of green manures is their ability to suppress weeds. Also, a higher crop density can reduce the biomass of weeds by reducing the amount of available light. Green fertilizers are plants cultivated in order to improve physical, chemical and biological soil properties and provide the necessary nutrients for the optimal crop growth. The use of different types of green manure is a suitable management for sustainable production in all agricultural ecosystems. In this way, the highest amount of light reaches to the crop and the least amount reaches to the competing weed. Increasing crop density can be an effective way to increase crop share of total source inventory and reduce weed dry weight. Rapeseed plant with allopathic substances in addition to food and medicinal uses, is also known as a weed controller providing a suitable environment for growing other plants by controlling weeds. This experiment was, therefore, performed to investigate the effect of canola green manure and planting density on weed control and sunflower yield.
Materials and Methods: the present study was conducted as split-plot design based on randomized complete block with three replications at the Research Farm of the Bu-Ali Sina University in 2015-2016 growing season, to evaluate the effect of canola green manure and crop density on weeds dynamic and sunflower yield. Weed free, using and non-using canola green manure were set as main-plots and sunflower densities (6, 8 and 10 plants.m^-2) were considered as sub-plots. Rapeseed was mixed with soil at the beginning of flowering stage and after two weeks, sunflower was planted in the main plots with the desired planting densities. The amount of rapeseed biomass at the time of return to the soil was about 6250 kg of shoot dry matter per hectare. In each sub-plot, six rows with five meters long were planted. Weeds were sampled to determine their density and dry weight in three stages (three weeks after emergence, flowering and physiological maturation of sunflower) with three replications by 1 × 1 m² quadrat. Weeds were counted by species and their biomass was measured after drying for 72 hours in an oven at 80 °C. Also, two square meters were taken from each experimental plot after applying the margin effect (one row on both sides and half a meter from the top and bottom of the planting row) so as to measure the yield of sunflower seeds. Weed control efficiency index was used to evaluate the ability of green manure and plant density in controlling weed of sunflower field. Data analysis was done by SAS ver. 9.1 and comparison of means was performed using LSD test at the significance level of 95%.
Results and Discussion:Maximum weeds density and biomass were found at the treatment of 6 plants.m^-2 under non-using green manure. In comparison with this treatment, cultivation of sunflower with 10 plants.m^-2 under using green manure increased weed control efficiency (WCE) up to 79% and decreased biomass of Amaranthus retroflexus, Chenopodium album, Setaria viridis, Convolvulus arvensis and total weeds up to 70, 76, 99, 92 and 72 %, respectively. Sunflower yield at the 10 plants.m^-2 density was the highest and the same under weed free and weed infested by using green manure. The interaction effect of treatments on density and biomass of sunflower field weeds was significant. The highest and lowest density and biomass of weeds were obtained from uncontrolled at a density of six plants and green manure at a density of 10 plants, respectively. Also, the highest yield of sunflower seeds (411 g.m^-2) was attributed to the density of 10 plants in weed control treatment, which was insignificantly different with the density of 10 sunflower plants in the application of green manure, which had a yield of 379 g.m^-2. This can be attributed to the role of green manure in controlling weeds, increasing microbial activity, increasing food mobility and better use of water and nutrients. It seems that at low densities, the absorption of solar radiation and dry matter production are lower due to the low leaf area. Other researchers have attributed increased corn yield at high densities to greater uptake of solar radiation by the canopy.
Conclusion: Since the goal of sustainable agriculture is applying minimum herbicides and alternative management methods to control weeds, application of green manure and normal crop density can be a good strategy in this regard. Therefore, sunflower cultivation with density of 10 plant.m^-2 and using green manure suppressed weeds and produced the highest yield. Therefore, this treatment can help to reduce herbicide application, and it will be an effective step for promotion of sustainable agriculture.

Keywords

Agronomical methods of weed control; Sustainable agriculture; Mulch; Integrated weed management

References

1. Sparks D.L., Thompson H.A., and Gupta H.V. 2009. Visible changes in macro mica particles that occur with nickel depletion. Water Air and Soil Pollution 31: 217-230.
2. Akbari M., and Afshari H.R. 2014. Comparison of synthetic chelates and compost for phytoremediation of Cd, Ni and Pb from contaminated soil. Journal of Water and Soil 28(4): 217-230. (In Persian with English abstract)
3. Auskarniene O., Psibisauskiene G., Auskalnis A., Kadzys, A.K. 2010. Cultivar and plant density influence on weediness in spring barely crops. Zemdirbyste -Agriculture 97: 53- 60.
4. Bahadur S., Verma S.K., Prasad S.K., Madane A.J., Maurya S.P., Verma V.K., and Sihag S.K. 2015. Eco-friendly weed management for sustainable crop production-A review. Journal of Crop and Weed 11(1): 181-189.
5. Campiglia E., Paolini R., Colla G., and Mancinelli R. 2009. The effects of cover cropping on yield and weed control of potato in a transitional system. Field Crops Research 112: 16–23.
6. Francis C.A. 2019. Integrated weed management for sustainable agriculture. Agroecology and Sustainable Food Systems 43(3): 358-360.
7. Cherr C.M., Scholberg J.M.S., and McSorley R. 2006. Green manure approaches to crop production: A Synthesis. Agronomy Journal 98: 302–319.
8. Dhima K.V., Vasilakoglou I.B., Eleftherohorinos I.G., and Lithourgidis A.S. 2006. Allelopathic potential of winter cereals and their cover crop mulch effects on grass weed suppression and corn development. Crop Science 46: 345-352.
9. Egodawatta W.C.P., Sangakkara U.R., Wijesinghe D.B., and Stamp P. 2011. Impact of green manure on productivity patterns of home-gardens and fields in a Tropical Dry Climate, Trop. Agricultural Research 22(2): 172-182.
10. Glab T., and Kulig B. 2008. Effect of mulch and tillage system on soil porosity under wheat (Triticum aestivum). Soil and Tillage Research 99: 169-178.
11. Gnanavel I., and Natarajan S.K. 2014. Eco-friendly weed control option for sustainable Agriculture- A review. Agricultural Review 35: 172-83.
12. Hamzei J., and Ghamari Rahim N. 2014. Evaluation of corn-soybean intercropping advantages using agronomic and weed control efficiency indices.  Agricultural Science and Sustainable Production 24(3): 61-73. (In Persian with English abstract)
13. Haramoto E.R., and Gallandt E.R. 2005. Brassica cover cropping: II. Effects on growth and interference of green bean (Phaseolus vulgaris) and redroot pigweed (Amaranthus retroflexus). Weed Science 53: 702-708.
14. Kaur H., Singh G., and Pandurang P. 2019.  A Review on Different Weed Management Approaches. International Journal of Current Microbiology and Applied Sciences 8(8): 2854-2859.
15. Kolb L.N., Gallandt E.R., and Mallory E.B. 2012. Impact of spring wheat planting density, row spacing, and mechanical weed control on yield, grain protein, and economic return in maize. Weed Science 60: 244-253.
16. Kumar R., Mahajan G., Srivastava S., and Sinha A. 2014. Green manuring: A boon for sustainable agriculture and pest management – a review. Agricultural Review 35(3): 196-206.
17. Larkin R.P., and Griffin T.S. 2007. Control of soilborne potato diseases using Brassica green manures. Crop Protection 26(7): 1067-1077.
18. Maitra S., Zaman A., Mandal T.K., and Palai J.B. 2018. Green manures in agriculture: A review. Pharmacognosy and Phytochemistry 7(5): 1319-1327.
19. Mohler C.L., Dykeman C., Nelson E.B., and Ditommaso A. 2012. Reduction in weed seedling emergence by pathogens following the incorporation of green crop residue. Weed Research 52: 467-477.
20. Nordby D., Hartzler E., and Robert G. 2005. Influence of corn on common waterhemp (Amaranthus rudis) growth and fecundity. Weed Science 52: 255-259.
21. Rajcan I., and Swanton C.J. 2010. Understanding maize weed competition: resource competition, light quality and whole plant. Field Crops Research 71: 139-150.
22. Salahin N., Alam M.K., Islam M.M., Naher L., and Majid N.M. 2013. Effects of green manure crops and tillage practice on maize and rice yields and soil properties. Australian Journal of Crop Science 7(12): 1901-1911.
23. Singh RK., and Singh SRK Gautam US. 2013. Weed control efficiency of herbicides in irrigated wheat (Triticum aestivum). Indian Research Journal of Extension Education 13(1): 126-128.
24. Shah Z., Ahmad S.R., and Rahman H.U. 2010. Soil microbial biomass and activities as influenced by green manure legumes and N fertilizer in rice-wheat system. Pakistan Journal of Botany 42: 2589-2598.
25. Tejada M., Gonzalez J.L., GarcMartınez A.M., and Parrado J. 2008. Effects of different green manures on soil biological properties and maize yield. Bioresource Technology 99: 1758–1767.
26. Yadavi A.R., Ghalavand A., Aghaalikhani M., Zand E., and Fallah S. 2007. Effect of corn density and spatial arrangement on redroot pigweed (Amaranthus retroflexus L.) growth indices. Pajouhesh and Sazandegi 75: 33-42. (In Persian with English abstract)
27. Mohler C.L. 1996. Ecological bases for the cultural control of annual weeds. Production Agriculture, 9:468–474.
28. Westoby M., Leishman M., and Lord J. 1996. Comparative ecology of seed size and dispersal. Philosophical Transactions of the Royal Society B: Biological Sciences 351: 1309–1318.