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Integrated Weed Management in Upland Rice
A field experiment was conducted at the Instructional Farm, College of Agriculture, Vellayani, Thiruvananthapuram to evolve a suitable integrated weed management practice for upland rice. The study was conducted during the virippu season of 1999. The field experiment was laid out in split plot d...
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| Other Authors: | |
| Format: | Ph.D Thesis |
| Language: | Undetermined |
| Published: |
Vellayani
Department of Agronomy, College of Agriculture
2001
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| LEADER | 03208nam a2200181Ia 4500 | ||
|---|---|---|---|
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| 082 | |a 630 |b SHY/IN | ||
| 100 | |a Shyam Nair S | ||
| 245 | |a Integrated Weed Management in Upland Rice | ||
| 260 | |a Vellayani |b Department of Agronomy, College of Agriculture |c 2001 | ||
| 502 | |b MSc | ||
| 520 | 3 | |a A field experiment was conducted at the Instructional Farm, College of Agriculture, Vellayani, Thiruvananthapuram to evolve a suitable integrated weed management practice for upland rice. The study was conducted during the virippu season of 1999. The field experiment was laid out in split plot design having three replication with three main plot treatments and six subplot treatments. Three different spacings i.e., 15 x 10 cm 15 x 10 cm, 20 x 10 cm and 20 x 15 cm were the main plot treatments. Sub plot treatments were different weed management strategies consisting of three different herbicides in combination with one hand weeding, hand weeding alone twice, unweeded check and weed free check. Pendimethalin, Fluchloralin and Butachlor were the herbicides used in the experiment. The rice variety used for the experiment was Matta Triveni. The results of the study revealed that grasses, broadleaved weeds and sedges competed with the rice crop. Different weed management practices included in this experiment significantly influenced the intensity and distribution of the weeds, but the fluchloralin treatment (W2) resulted in phytotoxicity and affected the crop stand considerably. The application of butachlor + one hand weeding at three weeks after sowing (W3) and pendimethalin + one hand weeding at three weeks after sowing (wj ) showed very high control over weeds throughout the crop growth period. The plots hand weeded twice at 20 and 40 days after sowing also registered considerable reduction in weed growth. Among the spacings tried the medium spacing of 20 x 10 cm (S2) resulted in lowest absolute density of weeds. Although the application of Pendimethalin and Butachlor resulted in good control of grasses and broadleaved weed, their effect on sedges was meagre. All the weed management treatments except fluchloralin (W2) resulted in improved yield attributes and significantly higher yield compared to weedy check. Weed free check (S6) recorded the highest grain yield. Unweeded check recorded the lowest with 49.14 per cent yield reduction compared to weed free check. The various spacings tried did not result in significant difference in yield. No herbicide used in this experiment resulted in residual toxicity after the cropping season. Pendimethalin @ 1.5 kg a.i. ha-' + one hand weeding three weeks after sowing (w,) and Butachlor @ ] .25 kga.i. ha-' + one hand weeding three weeks after sowing (W3) were the most remunerative treatment and keeping the field weed free during the entire crop growth period was found to be not economic. | |
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