Tuesday, September 15, 2015
Organic Fertilizers, Organic Plant Growth Regulator, and Organic Plant Supplement as defined in the new Philippine National Standard for Organic Fertilizer
Sunday, December 19, 2010
A comparison of organic and conventional farming
1. Conventional and organic farming have much in common. They differ principally in the use of modern chemical technology. Conventional farmers use commercial inputs (fertilizers, pesticides, animal feed additives) to increase productivity while organic farmers prefer to use natural resources.
5. Urea is a natural organic waste product of human and animal metabolism. It is present in animal and human excreta and is therefore accepted as a natural and nonartificial nitrogen source in organic farming. However, the urea that is synthesized in factories which is chemically identical to the urea produced by human and animal metabolism (used as fertilizer in conventional farming), is not acceptable in organic farming. This is one of the inconsistencies in organic agriculture.
6. The urea produced by animals (present in excreta) or by factories (in commercial fertilizers) is transformed in the soil into ammonium and nitrate ions, the important forms of nitrogen taken up by plants. Both ions are inorganic, not organic. Therefore, in scientific terminology, the organically grown food produced with urea derived from animals is actually "inorganically grown."
Monday, October 11, 2010
Challenges and opportunities in agriculture
Senior Consulting Expert of Philippine Rice Research Institute (PhilRice)
I would like to share my thoughts about current challenges and opportunities in agriculture that institutions like Visayas State University (VSU) should be concerned. I could not over emphasize the fact that we are facing the problem of producing sufficient food to feed the ever increasing population of our country. Last census reported that our population is increasing by 2.3 percent, while our food production (particularly rice) is increasing by about 2.5 percent. The minimal growth difference between population and food production is not sufficient to provide the other requirements of small farmers to live a decent life. I hope the current census will show a
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*Excerpt of keynote speech delivered during the College of Agriculture Day, Visayas State University, Baybay, Leyte on July 2, 2010.
*Dr. Mamaril is a retired UP Los Banos soil science professor and International Rice Research Institute (IRRI) scientist. He is the son of Mr. Julian Mamaril, the first Superintendent of Visayas Agricultural College (forerunner of Visayas State University) in the early 1960s.
Sunday, August 29, 2010
Earthworms: the most important soil and ecosystem engineers

also able to translocate considerable amount of leaf-litter into the soil.
408-420.
Photo source:
Saturday, January 23, 2010
Response of corn to chicken dung and rice hull ash application and mycorrhizal fungi inoculation
We evaluated the growth and yield responses of corn to chicken dung and rice hull ash application a well as to mycorrhizal fungi inoculation. The experiment was laid out in a split-plot in Randomized Complete Block Design consisting of three replications. Vesicular-arbuscular mycorrhizal (VAM) inoculation served as the main plot while application of fertilizer was designated as the subplot. The fertilizer treatments included the following: To-control, T1-inorganic fertilizer (60-60-60 kg/ha N, P205, K20), T2-chicken dung alone (60 kg/ha N), T3-chicken dung (as in T2) + 30 kg/ha rice hull ash. The experimental area had an alluvial clay loam soil with pH of 5.8 and moderate fertility status.
Results showed that VAM inoculation significantly increased the total N but not the total P, K,

The inorganic fertilizer, chicken dung, and chicken dung plus rice hull ash significantly increased the number of ears per plant, ear length, number of grains per ear, weight of 1000 seeds, grain yield and harvest index. The use of chicken dung combined with rice hull ash for corn production is a good substitute for the inorganic fertilizer in increasing corn grain yield. (Above photo shows VAM infection in the root of corn from this study).
Reference
Luz Geneston-Asio and Alfredo B. Escasinas. 2006. Response of corn to chicken dung and rice hull ash application and mycorrhizal fungi inoculation. Annals of Tropical Research 26: 23-36
Thursday, May 21, 2009
Organic fertilization improves soil fungi population
While organic fertilization is now widely known to improve the general soil quality, more data from field experiments are still needed to support this notion. Cwalina-Ambroziak and Bowszys (2009) carried out a 3-year field experiment to determine the influence of organic fertilization on the community of soil fungi as compared to no fertilization and NPK fertilization only. Findings of the study revealed a significantly higher total number of fungal colony-forming units in soil applied with organic fertilizer than in soil without fertilizer application and the one applied with NPK mineral fertilizers. Moreover, pathogen population was highest in soil without fertilization and lowest in the soil added with organic fertilizer.
The study demonstrated that organic fertilization has a positive influence on the structure of soil fungi communities. This was particularly more observable in the qualitative changes in fungi composition than in the changes in fungi numbers. Results of the study support the findings of other researchers that organic fertilization stimulates the growth of soil microorganisms and that it protects the plants against pathogens of the genus Pythium and Phytophthora.
According to Terekhova (2007) fungal communities represent one of the most important functional and structural components of biological systems. Fungi affect the properties of the soil via the regulation of pedogenic processes; the composition of soil organic matter; the soil structure status; the soil acidity; the soil temperature characteristics; and certainly via the regulation of the functioning of soil microbiota.
References
Cwalina-Ambroziak B. and T. Bowszys. 2009. Changes in fungi communities in organically fertilized soil. Plant Soil Environ 55: 25-32.
Terekhova V.A. 2007. The importance of mycological studies for soil quality control. Eurasian Soil Science 40: 583-587.