Effects of the different tillage techniques on the efficiency of weed control and nitrogen uptake in transplanted rice / by Yolanda Lamanug Castroverde.
Material type:
TextLanguage: English Publication details: Los Baños, Laguna : University of the Philippines, 1978.Description: 83 pages: illustrations ; 28 cmContent type: - text
- unmediated
- volume
- 633.18 C27 1978
| Item type | Current library | Collection | Call number | Materials specified | URL | Status | Notes | Date due | Barcode |
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Theses / Manuscripts
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Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 633.18 C27 1978 (Browse shelf(Opens below)) | Link to resource | Room use only | T-1132 | 00002153 |
Thesis (M.S. - - Agronomy) University of the Philippines, College, Laguna.
Includes bibliographical references.
CASTROVERDE, YOLANDA LUMANUG, University of the Philippines at Los Banos, October, 1978. Effects of the Different Tillage Techniques on the Efficiency of Weed Control and Nitrogen Uptake in Transplanted Rice. Major Professor: Dr. Basilio B. Mabbayad.
Two field experiments were conducted at the Central Experiment Station, University of the Philippines at Los Banos during the wet season of 1977 with the following objectives: (1) to find out the grain yield response of IR-36 to the different tillage techniques; (2) to evaluate the efficiency of chemicals as substitutes for land preparation of transplanted IR-36; and (3) to determine the effect of the different levels of nitrogen fertilizer applied at different times on the growth and yield of C168-134.
Experiment I was a comparative study of the six tillage techniques and their effect on the efficiency of weed control, yield and other agronomic characters of IR-36.
Results indicated that except for the grain yield, and number of filled grains per panicle, all of the yield components were not significantly affected by the different tillage techniques. The highest mean yield (5122 kg/ha) was obtained from the minimally tilled plote (dalapon applied 2.5 kg/ha 15 DBI; dalapon at 2.5 kg/ha after 5 days; paraquat at 0.5 kg/ha after 5 days; followed by one plowing and one harrowing), and the lowest from the no-till plots.
The yield reduction could be attributed to the presence of large regrowth of F. littoralis that were not controlled effectively by the preplant herbicide treatments. The mean yield obtained from the conventional-tilled plots was 5002 kg/ha.
Experiment 2 was a comparison of the three tillage techniques as affected by the time and rate of fertilizer application and their effect on the efficiency of weed control and nitrogen uptake, yield and other agronomic characters of C168-134, rice variety.
Statistical analysis revealed that tillage techniques and fertilizer treatments significantly affected grain yield. Among the tillage techniques used and the fertilizer treatments applied, minimal and zero tillage plots produced greater mean yields (4288 kg/ha and 4069 kg/ha, respectively). The mean yield of the conventionally-tilled plots was only 3825 kg/ha, The increased grain yield in the zero and minimal tillage plots was attributed to the presence of weeds which were small in size hence, less competitive as to reduce yield. Results of the study offer no
possible explanation for the yield reduction in the conventional tillage plots hence further study along this line is recommended.
The results of these studies indicated that it is possible to practice minimal tillage as a substitute for conventional tillage depending upon the weed species present, fertility status of the soil, and other production factors which may affect the efficiency of using the different tillage techniques.
Submitted to the University Library April 29, 1988 T-1132