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Influence of tillage, rate of seeding and weed control on wetseeded rice / Evelyn B. Tabelin.

By:

Tabelin, Evelyn B [author]

Contributor(s):

Mabbayad, Basilio B [adviser]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1982. Cavite State University- Main Campus,Description: 128 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

631.51 T11 1982

Online resources:

Click here to view thesis abstract and table of contents

Abstract: TABELIN, EVELYN BALTAZAR, University of the Philippines at Los Bafios, March 1982. Influence of Tillage, Rate of Seeding and Weed Control on Wet-Seeded Rice. Major Professor: Dr. Basilio B. Mabbayad Two field experiments were conducted at Midsayap Experiment Station, Bual, Midsayap, North Cotabato from February to June 1981 to evaluate the efficiency of different degrees of tillage as a substitute for conventional land preparation in growing wet-seeded rice, to determine the interaction between variety, degree of tillage and rate of Seeding and to determine the efficacy of chemicals plus hand weeding in the control of weeds under different degrees of tillage. In experiment 1, conventional tillage gave the highest grain yield and the lowest was from zero tillage. Yield reduction was accounted for by the reduction of crop establishment resulting from ineffective control of the pre-plant herbicides used on weeds prior to planting. TR 54, an early maturing and semi-dwarf variety, was found to perform better than IR 50, a very early maturing and dwarf variety under this particular set of conditions. Wet-seeded at the rate of 100 kg/ha was comparable to transplanting. Increasing the rate of seeding beyond 100 kg/ha was found to be wasteful since there was no appreciable yield increase. In experiment 2, the greatest number of Fimbristylis littoralis was observed on the tilled plots, but the highest weed weight was obtained from no-tilled plots. Grain yield under minimum tillage (MT) was comparable to conventional tillage. On weed control, butachlor / hand weeding (hw) was the same as 2. hw. - Further weeding at 3 days after spraying 2, 4-0 caused no significant increase in yield. Yield components and other agronomic characters under the conventional and minimum tillage (MT) were consistently better than the other tillage treatments. The results of these studies indicate that it is possible to practice minimum tillage (M71) as a substitute for conventional tillage on wet-seeded rice. However, success depends on the weed species and population present and other factors which may affect the efficiency of using the different degrees of tillage. Likewise, pre-emergence herbicide 7 1 hw was found to be effective in controlling weeds under the different degrees of tillage.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	631.51 T11 1982 (Browse shelf(Opens below))		Link to resource	Room use only	T-1552		00002386

Thesis (M.S. - - Agronomy) University of the Philippines, College, Laguna.

Includes bibliographical references.

TABELIN, EVELYN BALTAZAR, University of the Philippines at Los Bafios, March 1982. Influence of Tillage, Rate of Seeding and Weed Control on Wet-Seeded Rice. Major Professor: Dr. Basilio B. Mabbayad

Two field experiments were conducted at Midsayap Experiment Station, Bual, Midsayap, North Cotabato from February to June 1981 to evaluate the efficiency of different degrees of tillage as a substitute for conventional land preparation in growing wet-seeded rice, to determine the interaction between variety, degree of tillage and rate of Seeding and to determine the efficacy of chemicals plus hand weeding in the control of weeds under different degrees of tillage.

In experiment 1, conventional tillage gave the highest grain yield and the lowest was from zero tillage.

Yield reduction was accounted for by the reduction of crop establishment resulting from ineffective control of the pre-plant herbicides used on weeds prior to planting.
TR 54, an early maturing and semi-dwarf variety, was found to perform better than IR 50, a very early maturing and dwarf variety under this particular set of conditions.

Wet-seeded at the rate of 100 kg/ha was comparable to transplanting. Increasing the rate of seeding beyond 100 kg/ha was found to be wasteful since there was no appreciable yield increase.

In experiment 2, the greatest number of Fimbristylis littoralis was observed on the tilled plots, but the highest weed weight was obtained from no-tilled plots.

Grain yield under minimum tillage (MT) was comparable to conventional tillage. On weed control, butachlor / hand weeding (hw) was the same as 2. hw. - Further weeding at 3 days after spraying 2, 4-0 caused no significant increase in yield.

Yield components and other agronomic characters under the conventional and minimum tillage (MT) were consistently better than the other tillage treatments.

The results of these studies indicate that it is possible to practice minimum tillage (M71) as a substitute for conventional tillage on wet-seeded rice. However, success depends on the weed species and population present and other factors which may affect the efficiency of using the different degrees of tillage. Likewise, pre-emergence herbicide 7 1 hw was found to be effective in controlling weeds under the different degrees of tillage.

Submitted to the University Library 10/26/1993 T-1552