TAILIEUCHUNG - THE MANUFACTURING AND APPLICATION OF ORGANIC COMPOUND FERTILIZERS

Transkei, Ciskei, rural, peri-urban and urban consumers on the reasons for not consuming organic products. The two main reasons advanced is that organic products are expensive according to 60% of the consumers in the Transkei, of consumers in the Ciskei, of peri-urban consumers and of urban consumers (see Table 1). The second reason advanced is that organic products are not readily available according to 60% of the consumers in the Transkei, of the consumers in the Ciskei, 80% of rural consumers, of peri-urban consumers and of urban consumers. | THE MANUFACTURING AND APPLICATION OF ORGANIC COMPOUND FERTILIZERS . Juang Department of Soil and Environment National Chung Hsing University Taichung Taiwan Republic of China ABSTRACT This Bulletin discusses several manufacturing processes for organic compound fertilizers overseas and in Taiwan. The different formulations of N-P2O5-K2O in the fertilizers are also reported. The yield response of different crops from the application of organic compound fertilizer reflects their superiority over organic fertilizers. Experiments also showed that the use of organic compound fertilizers improved the quality of tea and some orchard fruits. INTRODUCTION Early in the 1970s a South African fertilizer company Groeikrag Organic Fertilizers Co. began to produce an organic fertilizer which contained guano and ammonium carbonate as the main ingredients. It was widely used by South African farmers Botha 1982 . In the United States the Dickerson Composting Plant used sludge slurry composted together with coarse wood chips with lime or rock phosphate added to the final product depending on market requirements. The cost of the composting system was quite high and the Dickerson plant suffered a net loss . 7 millionper 100 000 mt in 1982. There are now many commercial compost plants in the United States processing poultry wastes corn residues livestock manure crop residues and sewage sludge. The average sale price of their compost was around US 25-30 mt plus US 5 delivery cost. Most compost plants lose money even when the products are used in plant nurseries or home gardens. If chemical N P and K is added the price can rise to US 31-50 mt . These are known as compost-NPK plus or organic compound fertilizers. Sometimes the added NPK exceeds 38 of the total present in the compost. In 1990 an activated sludge pasteurization process ASP was developed in South Africa. The activated sludge was enriched with N and P N P 11 18 through natural aerobic and anaerobic digestion. The .

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