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Niche Relationships in Shore Bugs of the Genus Valleriola

Volume 2 No. 4 October – December 1980 / By

Antonio A. Barroso ABSTRACT Valleriola burnoi (Usinger) and Valleriola mindorana Drake were found to “coexist” on the same rock surfaces in the same area at the same time in Molawin Creek, Los Banos, Laguna. A closer examination of their niche relationships revealed varying degrees of habitat specialization in favorable areas. Differences in dispersion, behavioral patterns …

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Effect of Soil Depth on the Degree of Sweet Potato Weevil Infestation

Volume 2 No. 4 October – December 1980 / By

T. Burdeos and D. P. Gapasin ABSTRACT Soil depth affected the degree of sweet potato weevil infestation. Highest weight of infested tubers was obtained from the control (without soil added) while the lowest weight was obtained at 26 cm soil depth. Weevil population in tubers showed a similar trend. No infestation was recorded at 29 …

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Phytotoxicity of Profluralin to Rottboellia exaltata L.

Volume 2 No. 4 October – December 1980 / By

Marita Ignacio-Galinatospan style=”font-size: 70%; vertical-align: super;”> ABSTRACT The effect of a pre-emergence herbicide on the growth of Rottboellia exaltata L.F. was determined using different concentrations of profluralin or CGA-10832. Concentrations of 5. 10, 25 and 50 ppm induced inhibition of root and shoot growth accompanied by swelling of root tips and coleoptilar nodes. Abnormal enlargement …

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Green Manure and NPK Effects on the Yield of Sweet Potato in Eroded Soil

Volume 2 No. 4 October – December 1980 / By

Clement G. Sales and Reynaldo R. Javier ABSTRACT Green manure did not cause any significant effect on most of the yield and yield components of sweet potato variety BNAS-51; a significant decrease in the number of non-marketable tubers was observed. Highly significant differences among fertilizer treatments were obtained for yields of marketable tubers, total tuber …

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Growth and Yield of Soybean as Affected by Inoculation with Strains of Rhizobium japonicum

Volume 2 No. 4 October – December 1980 / By

A. Ritaga, R. G. Escaladaand A. S. Almendras ABSTRACT Three soybean varieties (Clark-63. UPLB Sy-2. and TK-5) were inoculated with strains of Rhizobium japonicum (TAL 102. TAL 103. TAL 377, and Allen 527) using broth culture. The inoculated plants grew taller and formed more nodules than the uninoculated ones but no significant differences on the …

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Determination of Constant Factor and Index Leaf for Rapid Leaf Area Estimation in Taro

Volume 2 No. 4 October – December 1980 / By

J. R. Pardales, Jr. ABSTRACT Five taro cultivars were selected from the germplasm at the Philippine Root Crop Research and Training Center in ViSCA, Baybay, Leyte to determine their estimated and actual leaf areas. Correlation analysis of the estimated and actual leaf areas revealed a high linear association between them. A general regression equation = …

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Soil Factors Affecting Zinc Availability in Sonic Alluvial Soils of Leyte and Southern Leyte

Volume 2 No. 3 July – September 1980 / By

Faustino P. Villamayor ABSTRACT Phosphorus (P) is generally considered to be the most limiting mineral nutrient in tropical soils. This study was conducted to determine the amounts of Pin various components of the rainforest ecosystem. Composite samples of rocks, soil, stream sediments, stream water, rainwater, leaves of dominant vegetation, forest litter, wood and moss were …

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Zinc Content of Alluvials As Affected by Residual Soil from the Upper Catchment Area

Volume 2 No. 3 July – September 1980 / By

Faustino P. Villamayor ABSTRACT Residual soils, whose geology is marine and terrestial sediments, have higher available zinc content than those whose geology is marine elastics. These residual soils come from the upper catchment areas of alluvial soil. Available zinc contents of four alluvial soil series, namely Palo, Umingan, San Manuel and Mattdaue, were observed to …

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Performance of Different Mungbean Varieties Grown in the Open Field

Volume 2 No. 3 July – September 1980 / By

Juanita B. Moulin and Rodolfo G. Escalada ABSTRACT Sixteen varieties of mungbean grown in ViSCA during the wet season were evaluated for their growth and yield performance In the open field. Their agronomic parameters measured such as seedling emergence, flowering, maturity, plant height, and number of nodules developed per plant differed significantly among varieties. Most …

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