The organic challenge
In farming, certain difficulties are to be expected, but the challenges Feng Hsiao-fei had to face far surpassed her expectations.
Due to their fragrant, sweet flavor and ten-month-long growing season, citrus trees are highly susceptible to pests and diseases. Taiwan's hot, humid climate and poor pest management only make it harder. In general, organic farming is only suitable in soil which contains at least 5% organic matter, but 65% of the soil in Taiwan contains less than 2% organic matter, and in Chungliao the figure is only 0.9%.
On the advice of Professor Cheng Cheng-yung of National Taiwan University's Department of Horticultural Science and his wife, Lin Pi-hsia, as well as Professor Tsai Tung-tsuan of Chunghsing University's Department of Plant Pathology, they started by adopting the minimum standard, known as "no pesticide residue." According to this standard, small amounts of pesticides can be applied to the crop during its initial growing period, but after harvesting, the crop has to pass an inspection to assure that no residue remains. Their plan was to first revive the fertility of the soil and then continue to work toward going "pure organic."
But this doesn't mean that insects were no longer a threat, since none of the pesticides that do not leave behind residues is effective in warding off long-horned beetles (Anoplophora sp.)--the greatest headache of citrus farmers. According to Professor Lin, who has been doing research on organic farming for many years, every year, around April or May, long-horned beetles lay their eggs near the base of tree trunks. As soon as the larvae hatch they begin to bore into the trunk, and continue eating until they have devoured the entire pith of the tree. The conventional way of dealing with them is to spray a highly toxic systemic pesticide around the base of the tree. This gets absorbed by the tree's roots and is circulated throughout the entire tree; even the fruit at the tree's extremities absorbs it, so that it can't be removed even by washing or peeling.
At Hsitiyao, instead of spraying pesticides, they wrap the base of the tree in a plastic net which prevents the adult beetles from laying their eggs in the trunk. In the first year, unfortunately, they were still unclear about the proper timing, so by the time they began to put up the nets, the beetles were already boring their way into the trees. Feng was obliged to hire other farmers to help her inspect each tree for holes. When they found a hole, they applied rags soaked in camphor oil and secured with metal wire in order to drive out the beetles. "One day I would go out on inspection and not find any holes, but the next day there would be new holes; you just never know where these beetles will bore next," Feng recollects with a shudder the two or three months she spent continuously catching beetles.
In addition to pesticides, excessive use of fertilizers is also a big problem.
"As soon as a farmer sees that a tree isn't growing well, the first thing he does is apply some fertilizer," explains Lin Pi-hsia. Sometimes it's a transient physiological phenomenon, or it may be that the roots are damaged, so it's necessary to use the right remedy. It's the same with humans; nutritional intake has to be properly balanced. How can overeating lead to good health? Moreover, overuse of fertilizers also does much damage by making the soil acidic. But farmers have become so accustomed to using fertilizers that they don't even question it any more, and it's very hard for them to change their views. Thus, how to use fertilizers judiciously has become a contentious issue between Feng and the farmers who have been assisting her.
Growing organic oranges at Hsitiyao is labor intensive. For example, after the trees are pruned, the clippings have to be collected and hauled away in order to avoid damage due to the pathogens which proliferate in rotting foliage. (facing page, lower right:) In order to prevent long-horned beetles from laying their eggs near the base of the tree trunks, it is necessary to put up posts and wrap nets around each tree, and then continuously inspect and repair them.