https://hdl.handle.net/20.500.12852/263 Sun, 05 Apr 2026 16:06:46 GMT 2026-04-05T16:06:46Z https://hdl.handle.net/20.500.12852/1233 Influence of nitrogen and zinc fertilization on the agronomic performance and on the crude protein and zinc concentration of IPB Var 1 corn variety Suriyo, Worawat The effects of zinc and nitrogen fertilization on the agronomic characteristics of corn; the relationship between nitrogen and zinc fertilization, and the uptake of nitrogen and zinc by the plant as indicated by the concentrations of protein and zinc in leaves and grain; and the effects of nitrogen and zinc fertilization on zinc concentrations in leaves and grain at different growth stages were studied at the experimental field and the chemical laboratory of the College of Agriculture, Central Philippine University, Iloilo City, Philippines, from December 12, 1981 to April 12, 1982. The results of the study revealed that except on the number of days from planting to seedling emergence, number of days from seedling emergence to tasseling and silking, plant height and zinc concentrations in flag leaf and grain, the levels of applied nitrogen significantly affected the agronomic characteristics of corn, such as the number of days from seedling emergence to maturity, length and weight of cobs, shelling percentage, stover and root weight, grain yield, and protein concentration of ear leaf at silking and maturity and of the grains. However, varying levels of applied zinc did not show any significant effect on the above-mentioned agronomic characteristics except on shelling percentage. Statistical analyses further showed that except on length of cob and shelling percentage, the levels of nitrogen and zinc had no interaction effects on the other agronomic characteristics of IPB 1 corn variety. The results of the cost and return analysis further revealed that regardless of applied zinc levels, the net returns obtained and the corresponding return on investment increased continuously with increasing levels of applied nitrogen. At increasing levels of applied zinc, the net returns and return on investment decreased continuously because zinc levels did not have any significant effect on yield. Abstract only Thu, 01 Jan 1987 00:00:00 GMT https://hdl.handle.net/20.500.12852/1233 1987-01-01T00:00:00Z https://hdl.handle.net/20.500.12852/1228 Graftability of 'Carabao' mango (Mangifera indica linn.) scions as affected by modes of packaging and storage durations Yonder, Yondre Jaen The study was conducted at the nursery of the Bureau of Plant Industry - National Mango Research and Development Center, San Miguel, Jordan, Guimaras from March to May 2003. This study aimed to determine the effect of modes of packaging and different storage durations on graftability of 'Carabao' mango scions. It also determined the interaction effect of modes of packaging and storage durations on graftability of 'Carabao' mango scions. It also measured the association between survival as manifested by bud emergence of grafted mango scions as a function of storage duration and modes of packaging on bud emergence or survival of scions. It also aimed to describe storage temperature and relative humidity on storage boxes where scions were packed at different modes and to describe agro-climatic data after grafting of scions that could affect success in grafting. Results of the study showed that graftability of 'Carabao' mango scions based on percentage viability, mortality, bud emergence and growth parameters was significantly affected by different storage durations and modes of packaging. A highly significant interaction was also observed between these two factors. Almost all data except on percentage of mortality of grafted scions observed at 25 to 50 days after grafting (DAG) and percentage of bud emergence at 5 to 20 DAG. In general, shorter durations of storage resulted in higher percentage of viability and bud emergence of grafted scions. Storage of more than 5 days resulted in a lower percentage. However, when scions were packed at 50 to 100 pieces, there was an increase in survival rate. In all instances, scions stored for 9 day regardless of modes of packaging died and only one plant survived out of the ten samples in replication 3. More vigorous grafted seedlings were achieved when grafting of stored scions was done at 1 to 5 days after collection, regardless of the modes of packaging used. When storage of scions was extended up to 7 days, more scions should be packed at 50 to 100 pieces to achieve moderately vigorous grafted seedlings. The combined linear effects of storage duration and mode of packaging contributed significantly to the variation in bud emergence of grafted scions. Almost 93 percent of the variations in bud emergence can be explained by the linear function involving storage duration and mode of packaging. Temperature and relative humidity in storage boxes had minimal variations that ranged from 28.20 to 28.37° C and 84.03 to 84.75 percent, respectively. Boxes where scions were stored for shorter duration had higher relative humidity, because evaporationx ii of moisture were still minimal. Combined effect of agro-climatic factors contributed on the success of grafted scions regardless of the different treatments used. From the results of the study, it can be concluded that scions should be grafted not more than 5 days after collection regardless of the modes of packaging used. Should grafting activity be extended up to 7 days, the number of scions should be increased from 50 to 100 pieces per pack to trap more moisture and delay drying up of scions. Wrapping materials should be moistened or properly maintain sufficient moisture and allow exchange of gasses within the scions in the storage containers. Abstract only Thu, 01 Jan 2004 00:00:00 GMT https://hdl.handle.net/20.500.12852/1228 2004-01-01T00:00:00Z https://hdl.handle.net/20.500.12852/980 The effect of different light intensities on the growth and flowering of potted mini chrysanthemum Genova, Regina C. Chrysanthemum or Mums is one of the major cutflower cultivars produced in the Philippines. It is considered a short-day crop, that is, the plant sets flower buds and blooms only when nights are long and days are short unless lighting is regulated. The aim of the study was to determine the effect of different light intensities on the agronomic characteristics and flowering of chrysanthemum. The study was conducted from March 20 to May 2010 at Canaan Farm, Salngan Purog, Pototan, Iloilo. The treatments consisted of different light intensities such as 50W, 75 W, 100W, 150W and no light. Results of the study showed that supplemental lighting of different wattages on potted chrysanthemum did not significantly influence the height of the plants, number of branches per plant, average number of flower buds and full bloom flowers per plant. However the number of days from transplanting to bud formation and to full bloom flowers significantly p<0.01) varied among treatments. Those plants provided with additional lighting of 50,75, 100 and 150 watts were delayed in the blooming of their flowers by an average of 6, 15, 19 and 24 days over that of the control plants. Abstract only Sat, 01 Jan 2011 00:00:00 GMT https://hdl.handle.net/20.500.12852/980 2011-01-01T00:00:00Z https://hdl.handle.net/20.500.12852/797 A comparative study on the cadmium and zinc uptake by kangkong (Ipomoea aquatica forsk.) and pechay (Brassica chinensis l.) grown in natural soil and coconut coir dust treated with cadmium sulfate or zinc sulfate Guzman, Jesus G. Jr. The study was conducted at Ungka I, Pavia, Iloilo from May to June 2006. The plant tissue samples were prepared at Central Philippine University and then analyzed by atomic absorption spectroscopy at the University of the Philippines Visayas. This study aimed to determine the effects of zinc and cadmium treatments on pechay and kangkong and to compare the results from the two experimental plants. It also aimed to study coir dust as a soil substitute. Results of the study showed that pechay and kangkong can grow without showing any serious symptoms of toxicity in growing media containing toxic levels of zinc (100 ppm) and cadmium (8 ppm). The negligible insect damage observed on cadmium treated plants supports the theory that certain plants hyper-accumulate heavy metals for defense. Data on biomass production show that coir dust can be a good substitute for soil in potted plants especially for plants that respond to high levels of organic matter like kangkong. Data reveal a few similarities in the uptake of zinc and cadmium by pechay and kangkong. Literature identify pechay as a hyper-accumulator with the characteristic shoot > root trend in its uptake of metals. But in this study, pechay manifested this trend only in its zinc levels for plants grown in artificial medium. On the other hand, kangkong grown in soil showed the shoot > root trend. Results contradicted cited literature about the competition of zinc and cadmium in plant uptake. Zinc levels of cadmium treated plants were relatively high implying an enhancement of zinc uptake rather than competition. Although the shoot > root trend was not consistently observed in kangkong, data show that it can hold high levels of cadmium and especially zinc in its root even with the short growing period involved. The tolerant and hardy characteristics observed plus the high levels of the metals in its root make kangkong a potential material for rhizo-absorption. Abstract only Sun, 01 Jan 2006 00:00:00 GMT https://hdl.handle.net/20.500.12852/797 2006-01-01T00:00:00Z