Volume 2 No. 2 April – June 1980

Varying lnoculum Levels of Bacteria-Nematodes and the Severity of Tomato Bacterial Wilt

Volume 2 No. 2 April – June 1980 / By

C. M. Napiere ABSTRACT Development of bacterial wilt was consistently earlier on plants inoculated with both bacterium (Pseudomonas solanacearum E.F. Smith) and nematode Meloidogyne incognita Chitwood) compared to those inoculated with the bacterium alone. The percentage mortality also increased with increasing nematode population in the bacterium-infested soil. The presence of M. incognita enhanced the development …

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Effects of Ipil-lpil and Ammonium Sulfate As Nitrogen Sources of Sweet Potato

Volume 2 No. 2 April – June 1980 / By

Leonila A. Urdaneta and Reynaldo R. Javier ABSTRACT Nitrogen application, either with the use of ammonium sulfate or ipil-ipil leaves, significantly improved the yield and yield components of the three varieties of sweet potato. except in the number of non-marketable tubers. Among the varieties tested, BNAS-51 yielded the highest amount of marketable tubers with an …

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Growth and Yield of Sorghum as Influenced by Green Manure and Soil Organic Matter Content

Volume 2 No. 2 April – June 1980 / By

R. B. Capuno, B. E. Fabre and R. G. Escalade ABSTRACT Green manure increased the organic matter content of the soil. Soybeans, as green manure, provided the highest organic matter content (3.796%), followed by mungbean (3.268%) and bushbean (2.836%). The plot without green manure had the lowest organic matter content of 1.740%. The nutrients from …

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Structure and Diversity of Arthropods at Wahila Ridge, Hawaii

Volume 2 No. 2 April – June 1980 / By

Nelson M. Esguerra and Patrick R. Jackson ABSTRACT Arthropod populations and their structure in soil and litter at three elevations were studied at Wahila Ridge, Hawaii. Berlese funnel was used to extract the fauna from soil and litter samples. More species and higher population of arthropods were recovered in stream soil and litter than in …

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Response of Coconut Seedlings to Spacing and Application of Nitrogen and Potassium

Volume 2 No. 2 April – June 1980 / By

Eufemia A. Almaden and Rebecco M. Santiago ABSTRACT Significant variations in the effects of spacing were observed on the vegetative growth and overall vigor of coconut seedlings in the nursery. Plants grown at a distance of 40 cm and farther (60 and 80 cm) had bigger girth diameter, more split leaves, and greater vigor index …

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Stems and Tubers for Rearing Sweet Potato Weevil

Volume 2 No. 2 April – June 1980 / By

E. A. Vasquez and D. P. Gapasin ABSTRACT Sweet potato weevil, Cylas formicarius elegantulus Fabr. was successfully reared on mature stems using longitudinal halves and on tubers using thin chips held between plastic rearing blocks. There were no differences in size and behavior of larvae, pupae and adults but there was only slight difference in …

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Residual Nitrogen From Legumes and Its Effect on the Succeeding Crop of Sweet Potato

Volume 2 No. 2 April – June 1980 / By

Antonio L. Acedo, Jr. and Reynaldo R. Javier ABSTRACT Three legumes (mungbean, bushbean, and soybean) and sweet potato (control) were planted during the first cropping. After harvesting each crop, the residues except those of sweet potato were plowed under and incorporated into soil. The final planting of sweet potato was done subsequently after the legume …

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