Category Archives: Volume 10 No. 1 (1988)

Note: Proctor Density of Uminan clay loam, Maasin clay and Malitbog clay


Author(s): Tomas D. Cardona and Alan L. Presbitero

Abstract

The proctor densities of Umingan clay loam, Maasin clay and Malitbog clay were 1,489.48, 1,444.61 and 1,527.49 kg/m3, respectively at the optimum soil moisture content of 25%, dry basis. These values are statistically different at 1% level based on Scheffe’s test.

Keywords : Proctor density. Optimum moisture content. Dry density. Umingan clay loam. Maain clay. Malitbog clay.

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Economic Analysis of Ipil-Ipil Feed Supplementation of native Caracows, Gandara, Samar


Author(s): Leonila S. Parilla, Oscar B. Posas and Rowena M. Ampong

Abstract

The average mild and cheese production was significantly higher in treated caracows than in untreated ones due to the increase in the protein intake of the treated animals thus increasing the solid content of the milk. Gathering and feedling ipil-ipil leaves to caracows, milking the caracows, and processing milk into cheese were the activities affected when ipil-ipil feed supplemented was introduced.
Partial budget analysis shows that net benefits derived from ipil-ipil feed supplementation were significantly higher in treated caracows than in the untreated ones. Marginal rate of return was very high indicating that ipil-ipil feed supplementation in Gandara, Samar is economically feasible, ceteris paribus. Sensitivity analysis gave an estimate of the benefits a carabao raiser gets as prices of output and cost of input change.

Keywords : Economic analysis. Fee supplementation. Leucaena leucocephala. Carabao production.

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Effect of Time and Frequency of Topping of Storage Root and Cutting Production of a Bushy Sweet Potato Cultivar


Author(s): Federico G. Villamayor, Jr. and Rudy D. Perez

Abstract

The effect of topping on storage root and apical stem cutting production of a bush sweet potato cultivar (VSP-2) was studied. In the first experiment, all terminal cuttings at least 16 cm long were cut either at 38, 45, 52, or 59 days after planting (DAP). Storage root yield was not significantly afftected by the time of topping. Meanwhile, the number of cuttings per plant (Y) is significantly related to the time of topping (X) by the equation Y = 0.31X-9.58 at 1% level (r=0997).
In the second experiment, the treatments were the frequencies of topping, i.e. one to five times. Topping started at 32 DAP and was repeatedly done at 2-week intervals depending on the topping frequency. Only terminal shoots reaching 25 cm long were cut. The number of cuttings produced per m2 (Y) is significantly related to the frequency of topping (X) by the equation Y= 7.70X -1.78 at 1% level (r=0.988). On the other hand, topping significantly reduced yield. The total storage root yield in t/ha (Y) is also significantly related to the frequency of topping by the equation Y= 18.45 -2.34X at 1% level (r=-0.985).

Keywords : Sweet potato [Ipamoea batatas(L) Lam], Topping. Pruning. Cutting production.

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Utilization of Cocoyam (Xantosoma sp.) Flour for Food


Author(s): Roberta Dizon-Lauzon and Linda B. Mabesa

Abstract

Cocoyam flour was prepared into cookies, chips and noodles and used as binder in meat loaf. The sensory attributes of the products were comparable to the same products produces from wheat flour and corn starch, and all the processed products were acceptable.
Product evaluation revealed that the level of cocoyam flour in meat loaf formulation is inversely related to the degree of shrinkage and volume of drippings. Cookie measurements showed that the height and weight of baked cookies were not significantly affected by the addition of cocoyam flour. However, the diameter and spread ratio of baked cookies decreased.

Keywords : Xanthosoma sp. Cocoyam flour. Cookies. Chips. Noodles. Meal loaf.

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Influence of Cultivar, Inoculum Density and Plant Age on the Incidence of Fusarium Root and Stem Rot in Cowpea


Author: Crisanta E. Sajise

Abstract

This study was undertaken to determine the effect of host genotype, inoculum density and plant age on the severity of Fusarium root and stem rot in cowpea (Vigna unguiculata). Different levels of Fusarium solani inculum, namely: 8 x 104, 2 x 106 and 4 x 108 conidia/mL were inoculated to 5-, 17- and 22-day old seedlings of TVX 289-4G, VCS 6-1 AND CES 42-2 cowpea cultivars. Among the cultivars tested, CES 42-2 was the most resistant since it exhibited a lower degree of infection in contrast to VCS 6-1 and TVX 289-4G. The degree of infection was not significantly affected by the different levels of inoculum used. However, plant age significantly affected the percentage of infected plants. Fusarium root and stem rot infection was higher in 22- than in 17-day old plants, and was completely suppressed in 5-day old seedlings. Significant interaction effects of inoculum density, cultivar and plan age as well as their combinations on disease severity were noted.

Keywords : Fusarium root and stem rot. Fusarium solani, Inocuum density. Cultivar. Cowpea (Vigna unguiculata).

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Reaction of Cassava Plants to Brown Leaf Spot Infection


Author(s): Manuel K. Palomar and Mario A. Martinez

Abstract

PRC 24 cassava plants inoculated with Cercospora henningsii at 8 weeks after planting manifested the earliest symptom and defoliation. Initial symptoms of cassava brown leaf spot disease are light green, round lesions about 3.5 mm in diameter which later turn greenish brown. These lesions then coalesce and result in blighting and subsequent defoliation. Out of the then coalesce and result in blighting and subsequent defoliation. Out of the 98 cassava accessions tested for susceptibility to the disease, 28 accessions were rated to be resistant with total lesion area ranging from 0 to 0.5 cm2.

Keywords : Cassava. Varietal resistance. Cercospora heningsii. Brown leaf spot disease. Susceptibility.

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