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