Effects of defoliation, runner removal, and fertilization on tuber yield of gabi (Colocasia esculenta L. Schott) /
by Sergio Eder Abit.
- Los Baņos, Laguna : University of the Philippines, 1978.
- 62 pages : illustrations ; 28 cm.
Thesis (M.S. - - Agronomy) University of the Philippines, College, Laguna.
Includes bibliographical references.
ABIT , SERGIO EDER , University of the Philippines at Los Banos, October, 1978. Effects of Defoliation, Runner Removal, and Fertilization on Tuber Yield of Gabi ( Colocasia esculenta L.) Schott, Major Professor : Dr. Arturo C. Alferez .
This experiment was conducted at the Philippine Root Crop Research and Training Center, Visayas State College of Agriculture, Baybay, Leyte under lowland condition during wet season 1977 to determine the effects of the removal of runners, degree of defoliation and varying levels of complete fertilizer on tuber yield, tuber size, leaf area index, nurnber of leaves and plant height of gabi.
Light defoliation treatment did not affect the leaf area index but increased plant height at maturity, size of tubers and tuber yield compared to the undefoliated plants, and those subjected to heavy defoliation, Heavy defoliation on the other hand resulted to a significant decrease in plant height and tuber yield.
The removal of runners from the mother plant markedly enhanced better growth of plants and significantly increased tuber yield. Larger tubers were developed where runners were removed from the mother plants.
Tuber yield and other agronomic characters significantly increased with increasing levels of complete fertilizer applied from 50 to 150 kg/ha of each N, P20n5 and K,6. There was an increase of about 2 tons of tubers for every 50 kg/ha of NPK applied as the rate of fertilizer was increased from 50 kg to 150 kg per hectare.