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close this bookAbstracts on Sustainable Agriculture (GTZ; 1992; 423 pages)
Open this folder and view contentsAbstracts On Traditional Land-Use Systems
Open this folder and view contentsAbstracts on farming systems research and development
Open this folder and view contentsAbstracts on integrated systems
Open this folder and view contentsAbstracts on cropping system
Open this folder and view contentsAbstracts on agroecology
Open this folder and view contentsAbstracts on agrometeorology
Open this folder and view contentsAbstracts on agroforestry
Open this folder and view contentsAbstracts on homegardens
Open this folder and view contentsAbstracts on seed production
close this folderAbstracts on plant protection
View the documentAcknowledgements
View the document1. Designing integrated pest management for sustainable and productive futures.
View the document2. Biotechnology's bitter harvest: herbicide-tolerant crops and the threat to sustainable agriculture.
View the document3. Chemistry, agriculture and the environment.
View the document4. Mise au point de techniques appropriées de lir qui seront utilisés par les petits agriculteurs traditionnels d'Afrique tropicale.(developing appropriate ipm technology for the traditional small-scale farmer in tropical Africa).
View the document5. Biological control in developing countries: towards its wider application in sustainable pest management.
View the document6. Transforming plants as a means of crop protection against insects.
View the document7. Utilization of va-mycorrhiza as a factor in integrated plant protection.
View the document8. Activity of four plant leaf extracts against three fungal pathogens of rice.
View the document9. A useful approach to the biocontrol of cassava pathogens.
View the document10. Evaluation of the biological activity of flax as a trap crop against orobanche parasitism of vicia faba.
View the document11. Insect pest management.
View the document12. Economic contributions of pest management to agricultural development.
View the document13. The effects of intercropping and mixed varieties of predators and parasitoids of cassava whiteflies (hemiptera: aleyrodidae) in Colombia.
View the document14. Prospects for traditional and cultural practices in integrated pest management of some root crop diseases in rivers state, Nigeria.
View the document15. Studies on cowpea farming practices in nigeria, with emphasis on insect pest control.
View the document16. Effect of various fertilizers and rates on insect pest/pearl millet relationship in Senegal.
View the document17. Insect pests of intercrops and their potential to infest oil palm in an oil-palm-based agroforestry system in India.
View the document18. Using weather data to forecast insect pest outbreaks.
View the document19. Insect pest management and socio-economic circumstances of small-scale farmers for food crop production in western Kenya: a case study.
View the document20. Rodent communities associated with three traditional agroecosystems in the San Luis potosi plateau, Mexico.
View the document21. Grain storage losses in Zimbabwe.
View the document22. Controlling weeds without chemicals.
View the document23. Weed management in agroecosystems: ecological approaches.
View the document24. Manual on the prevention of post-harvest grain losses.
View the document25. Evaluation of efficient weed management systems in pigeonpea (cajanus cajan l.)
View the document26. Weed management in a low-input cropping system in the Peruvian Amazon region.
View the document27. Poblaciones, biomasa y banco de semillas de arvenses en cultivos de maiz zea mays l. Y frijol phaseolus vulgaris l. Efecto de m+todos de control y rotaciones. (Weed population, biomass, and seed bank in maize and bean crops. Effects of control methods and crop rotations).
View the document28. Effects of groundnut, cowpea and melon on weed control and yields of intercropped cassava and maize.
View the document29. Intercropping and weeding: effects on some natural enemies of African bollworm, heliothis armigera (hbn.) (lep., Noctuidae), in bean fields.
Open this folder and view contentsAbstracts on water management
Open this folder and view contentsAbstracts on soil fertility
Open this folder and view contentsAbstracts on erosion and desertification control
Open this folder and view contentsAbstracts on potential crops for marginal lands

25. Evaluation of efficient weed management systems in pigeonpea (cajanus cajan l.)

J. Agronomy & Crop Science, 168, 1992, pp. 65-68

An investigation was undertaken to evolve effective and economic weed management practices for the sole and for intercropping systems involving pigeonpea. Field experiments were conducted to evaluate the different systems of weed management in pigeonpea.

Treatments consisted of three weed management systems namely manual (hand hoeing twice at 20 and 40 DAS) chemicals (fluchloralin, pendimethalin and oxadiazon) supplemented with one hand hoeing and biological (growing inter crops) combined with one hoeing along with unweeded check numbering twelve treatments replicated four times in randomized block design.

The results clearly show that the unweeded check plots recorded the highest total weed population of 132 and 165 m-2 respectively. At the early stages of observations there was significant reduction in weed population over unweeded check under the treatments receiving herbicides. The manual method of weed control was consistently weed free throughout the crop period. Among the three herbicides pendimethalin 0.50 kg ai ha-1 was superior to fluchloralin and oxadiazon in reducing the total weed population. Intercropping combined with one hand hoeing significantly reduced the weed population over intercropping alone.

The results clearly indicate that the highest grain yield was recorded under herbicide treated plots over unweeded check.

The severe weed competition in the unweeded check was responsible for the low yield in pigeonpea. Manual weed control method is as effective as chemical methods. However, the herbicides are more effective in controlling the weeds at the early stages of the crop growth.

Pre-emergence application of pendimethalin 0.50 kg ha-1 with hand hoeing registered the highest grain yield compared with other herbicides.

The highest net return of Rs. 6483 and Rs. 5231 was realised by the intercropping of pigeonpea coupled with one initial hoeing. Among the herbicides tested pendimethalin 0.50 kg ha-1 supplemented with one hand hoeing fetched the net return of Rs. 5024 and Rs. 4450 ha-1 during two seasons respectively.

1219 92 - 10/146

Plant protection

Latin America, Peru, humid tropics, study, weed management, cropping systems, low-input system, herbicides, mulches, shifting cultivation, forest clearing


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