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Effect of Delayed Processing on Alcohol Yield of Fresh Root Crops

Volume 9 No. 4 October – December 1987 / By

Edgardo E. Tulin and Emma S. Data ABSTRACT Delayed processing significantly affected the starch and total sugar contents of cassava and sweet potato roots. However, these is no apparent trend to show the relationship between delayed processing and starch or sugar content of the roots. Alcohol production was significantly influenced by late processing in sweet …

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Effects of Land Preparation and Postplanting Tillage on Weed Control and Cassava Yield

Volume 9 No. 4 October – December 1987 / By

Federico G. Villamayor, Jr. and Veronica L. Reoma ABSTRACT Two experiments were conducted to determine the effect of land preparation and postplanting tillage on weed control and cassava yield. The first experiment showed that weed biomass and cassava yield were not affected by the method of land preparation. Postplanting tillage, however, significantly affected weed biomass …

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Note: Use of Paraaminobenzoic Acid to Improve Yield of Silkworm (Bombyx mori L.)

Volume 9 No. 3 July – September 1987 / By

I.K. Pai, S.N Hegde and N.B Krishnamurthy ABSTRACT Paraaminobenzoic acid (PABA) at 50, 100, 200 and 400 ppm concentration were administered to third instar larvae of silkworm (Bombyx mori L.) by leaf dip method. Results showed marked improvement of the silk percentage at low concentrations of 50-100 ppm. The use of appropriate PABA concentrations in …

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Breeding Season, Sexual Maturity and Fecundity of the Blue Crab, Portunus pelagicus (L.) in Selected Coastal Waters in Leyte and Vicinity, Philippines

Volume 9 No. 3 July – September 1987 / By

Corazon B. Batoy, Josephine F. Sarmago and Bernadita C. Pilapil ABSTRACT Breeding activity of the blue crab Portunus pelagicus (L.) was found to be continuous all throughout the year with peak periods during the first and last quarters of the year. Fluctuations in gonad indices of males and females do not necessarily follow the same …

Breeding Season, Sexual Maturity and Fecundity of the Blue Crab, Portunus pelagicus (L.) in Selected Coastal Waters in Leyte and Vicinity, Philippines Read More »

Incidence of Aflatoxin Contamination in Cassava (Manihot esculenta Crantz)

Volume 9 No. 3 July – September 1987 / By

Crisanta E. Sajise and Lina L. Ilag ABSTRACT The incidence of aflatoxin contamination in cassava roots at different stages of maturity and during processing and storage was determined. No aflatoxin was obtained from 7- to 14- month old cassava roots. During storage, however, trace amounts of aflatoxin B1 were observed in stored cubes but not …

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Contact Toxicity of Decamethrin and Permethrin on Black Bean Aphid and Two of Its Coccinellid Predators

Volume 9 No. 3 July – September 1987 / By

Erlinda A. Vasquez, Emiliana N. Bernardo and Ma. Flerida A. Carino ABSTRACT The contact toxicity of decamethrin and permenthrin was evaluated on adult black bean aphids. (Aphis craccivora Koch) and third instar larvae and aults of its coccinellid predators. Chilomenes sexmaculata Fabr. and Coleophora inaequalis Fabr. Based on LC50 , decamethrin is more toxic to …

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Effects of Nitrogen Level and Row Spacing on the Growth and Yield of Flint Corn

Volume 9 No. 2 April – June 1987 / By

Berta Catingan-Ratilla and Victor P. Briones ABSTRACT Application of nitrogen fertilizer up to 90 kg/ha with 30 kg each of P2O5 and K2O did not remarkably affect the growth and yield parameters of flint corn. However, visual observation indicated that fertilization resulted in the development of sturdier corn plants with darker green and broader leaves. …

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Comparative Evaluation of Traditional Methods and Recommended Practice of Planting Sweet Potato

Volume 9 No. 2 April – June 1987 / By

Paz Saladaga-Eronico and Rodolfo G. Escalada ABSTRACT Generally, no significant differences in agronomic characters and yield components of sweet potato were observed using either the traditional methods or the recommended practice of planting. Varying the number of cutting per hill significantly influenced only the fresh vine weight of Kaimay, BNAS-51 and Samar Big Yellow sweet …

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Influence of Planting Date on Corn Grown in an Aquic Eutropept

Volume 9 No. 2 April – June 1987 / By

Emmanuel M. Cabia and Eduardo Paningbatan ABSTRACT Date of planting significantly influenced growth and development of corn. Corn first planted on the last week of April and those planted 3 and 5 weeks later (May 16 and May 29) exhibited superior growth and ear yields over those planted 7 and 9 weeks later (June 12 …

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Effects of Gamma Radiation on Some Morphological Characters of Sweet Potato

Volume 9 No. 2 April – June 1987 / By

Nestor L. Pido and Liwayway M. Engle ABSTRACT Inherent variations were observed in the lead shape of sweet potato cultivars Kinabakab and UPLB Acc. 624 and in the root skin pigmentation of BNAS-51 cultivar. Doses of 2000 and 3000 rads produced wrinkled and deformed leaves in vM1 plants of all three cultivars with the latter …

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