Time to stop using inorganic fertilizers. Natural sources of plant nutrients are everywhere. All we need to do is get them and put it into use. Ipil-ipil leaves is a good example to start with. Using it has some advantages: 
1) Ipil-ipil leaves are natural and good source of nitrogen. It is comparable to ammonium sulfate in supplying needed nitrogen to soils. Good for rice and corn plants. Good for other crops as well.
2) Every ipil-ipil you grow is an added tree. Tree numbers is declining fast due to urbanization, illegal logging activities and mass farming methods.
3) It helps improve soil texture.
4) Never make the soil acidic.
5) Cheap. You just need to grow several giant ipil-ipil trees to support you needs.
Disadvantage: Chemical fertilizer manufacturer and supplier will have lower income.
image courtesy of agricultural research service
