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Growth and water relations of cacao seedlings raised in different soil media and varying degrees of shade / by Richard T. Agbisit

By:

Agbisit, Richard T [author]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1980. Cavite State University- Main Campus,Description: 119 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

633.84 Ag1 1980

Online resources:

Click here to view thesis abstract and table of contents

Abstract: AGBISIT, RICHARD T., University of the Philippines at Los Banos, May, 1980. GROWTH AND WATER RELATIONS OF CACAO SEEDLINGS RAISED IN DIFFERENT SOIL MEDIA AND VARYING DEGREES OF SHADE. Major Professor: Dr. Rafael P. Creencia An experiment on cacao seedlings using Amelonado cacao variety was conducted to assess the growth and moisture status of cacao seedlings grown in three soils media under four degrees of shade. The soil media used were compost, basaltic clay and an equal proportion of compost, basaltic clay and fine river sand, while the Shade treatments used were 0%, 25%, 50% and 75%. This was performed at the Experiment Station, Plantation Crops Division, Department of Horticulture. Plant height was maximum under 50% shade while Stem diameter was maximum under 25% shade. The dry matter produced under these two shade regimes were not significantly different although a 25% shade seems to have produced more dry matter. The permanent wilting percentage obtained by growing cacao seedlings in containers is very much lower than the values obtained in the laboratory. The number of days to reach this point increased with shading varying from 6.4 days under full daylight to 9.9 days under 75% shade. The relative water content (RWC) of cacao seedlings was better conserved under 50% shade compared to the other treatments. The fluctuation in RWC during the day is closely associated with radiation levels and temperature and inversely related to the relative humidity of the air. The osmotic potential of the leaf seem to follow the same trend of the RWC of the leaf. The effect of the different soil media on the growth of cacao seedlings were not very evident except that compost (S1) seem to have produced seedlings which were consistently inferior than those seedlings produced in the other two soils. A mixture of compost, basaltic clay and fine river sand (S3) tended to produce better seedlings than basaltic Clay (S2) although in most instances the differences were not significant. There was no significant interaction between the shade and soil that was detected on the growth parameters measured except on the shoot/root ratio. A significant interaction was also observed between Shade and soil in the relative water content of the leaf.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	633.84 Ag1 1980 (Browse shelf(Opens below))		Link to resource	Room use only	T-1563		00002391

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

Includes bibliographical references.

AGBISIT, RICHARD T., University of the Philippines at Los Banos, May, 1980. GROWTH AND WATER RELATIONS OF CACAO SEEDLINGS RAISED IN DIFFERENT SOIL MEDIA AND VARYING DEGREES OF SHADE. Major Professor: Dr. Rafael P. Creencia

An experiment on cacao seedlings using Amelonado cacao variety was conducted to assess the growth and moisture status of cacao seedlings grown in three soils media under four degrees of shade. The soil media used were compost, basaltic clay and an equal proportion of compost, basaltic clay and fine river sand, while the Shade treatments used were 0%, 25%, 50% and 75%. This was performed at the Experiment Station, Plantation Crops Division, Department of Horticulture.

Plant height was maximum under 50% shade while Stem diameter was maximum under 25% shade. The dry matter produced under these two shade regimes were not significantly different although a 25% shade seems to have produced more dry matter.

The permanent wilting percentage obtained by growing cacao seedlings in containers is very much lower than the values obtained in the laboratory.

The number of days to reach this point increased with shading varying from 6.4 days under full daylight to 9.9 days under 75% shade.

The relative water content (RWC) of cacao seedlings was better conserved under 50% shade compared to the other treatments. The fluctuation in RWC during the day is closely associated with radiation levels and temperature and inversely related to the relative humidity of the air. The osmotic potential of the leaf seem to follow the same trend of the RWC of the leaf.

The effect of the different soil media on the growth of cacao seedlings were not very evident except that compost (S1) seem to have produced seedlings which were consistently inferior than those seedlings produced in the other two soils. A mixture of compost, basaltic clay and fine river sand (S3) tended to produce better seedlings than basaltic Clay (S2) although in most instances the differences were not significant.

There was no significant interaction between the shade and soil that was detected on the growth parameters measured except on the shoot/root ratio.

A significant interaction was also observed between Shade and soil in the relative water content of the leaf.

Submitted to the University Library 10/26/1993 T-1563