Influence of cultivar and weed control method on yield of dry-seeded and wet-seeded rice

Date

3-1980

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Keith Moody

Abstract

This study was conducted to determine the tolerance of IR36 and IR40 to butachlor, pendimethalin and thiobencarb, and to determine the effectiveness of these herbicides for weed control in rice dry seeded in rows or broadcast seeded on paddled soil.

Butachlor, pendimethalin and thiobencarb at 2.0 kg a.i./ha. Caused injury to IR36 in dry- and wet-seeded rice culture. At higher rates, more severe injury was observed. More phytoxicity was observed in dry-seeded rice. IR40 was generally more tolerant to the herbicides used than IR36.

All the herbicides applied gave fair control of grasses in dry seeded rice of broadleaf weeds and grasses in wet-seeded rice. Sedges were not effectively controlled in either rice culture, however, the time required for weeding was produced with the use of herbicides.

The yield of IR36 and IR40 were higher in wet-seeded than in dry seeded rice. Pendimethalin at 4.0 kg. a.i./ha markedly reduced the yield of IR36 and IR40, whereas, butachlor reduced IR40 yield for both dry- and wet-seeded rice. The yield reduction was due to crop injury caused by these herbicides. Thiobencarb, on the other hand, did not reduce the yield of IR36 when it was wet-seeded of the yield of IR40 when it was dry- or wet-seeded.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1980 A42 M36

Document Type

Thesis

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