Some half century ago Taiwan experienced industrialization that brought economic prosperity to the small island. Nevertheless, the expense that the whole society pays today for such social development including environmental pollution and degraded soil in agricultural system is uncalculatable. Some well-known events of chemical pollution are dioxin contamination caused by Tainan Anshun factory of CNPC (China National Petroleum Corporation), and arsenic pollution at Beimen District where thousands of people suffered the Blackfoot disease.
Sadly, in the 21st Century, environmental pollutions have never stopped. A recent report about dumping and burying hundreds of tons of waste slag deeply in lands at Xuejia District discomforted residents and aroused their concerns about the possibility of underground water and soil contamination (https://tw.appledaily.com/local/20200926/WBP47M27OBDLVLYJHDRRY55YGE/).
Compare to industrial contaminations that are sporadically distributed, traditional agriculture that unlimitedly uses chemical fertilizers, pesticides and herbicides often create a huge area of soil deterioration, which subsequently causes biodiversity loss in the soil microbes, thereby damaging the health of crop roots. In 2018, heavy rain and floods in southern Taiwan led to toppling of rice plants (Strain Tainan 16), and the following high temperatures induced serious rice blasts (https://www.youtube.com/watch?v=CvGSo-xOtD8#action=share), both causing a huge agricultural loss. Infection of rice blast is highly associated with the uptake of high levels of nitrogen from chemical fertilizers. Chemical fertilizers promote fruiting, while weakening the shoot and root developments. When grains absorb rainwater and gain weights exceeding the extent of root supports, rice individuals finally fall. Besides, misuse of pesticides and herbicides causes loss of beneficial bacteria and fungi, which are supposed to be symbiotic with endophytes, inevitably damaging the crop health. Especially when raining season brings heavy moisture, the rice blast pathogens disperse in the air and infect rice.
In contrast, at the same sites with serious rice falling and blast, natural farming using microbial materials provided by our USR team escaped the environmental disasters in 2018. The mechanisms of reducing the risks of rice falling and blast are attributable to the existence of soil biodiversity, which is fostered when farmers stop using chemical fertilizers and pesticides. In addition, beneficial microbes applied in the fields promote the growth and development of roots and shoots, subsequently fostering the health of the rice plant and the grain yields.
In Taiwan, there are at least two challenges to the natural farming. First, traditional agriculture receives more supports from governments than natural farming, inevitably lowering down the participation willingness for natural farming. Second, farmers concern if microbial solution is affordable and efficient for crop growth. Experiments conducted by our USR team revealed low cost of microbial materials, 300 NT dollars per 1000 m2 vs. 3000 NT dollar using traditional agriculture. Furthermore, crop yield of natural farming approximates that in traditional agriculture (13.8 vs. 14 units). Further considering the loss caused by rice blast, natural farming would be a better option.
However, the challenge to the natural farming did not stop; marketing of the high quality crop is the next concern. For promoting the natural farming, sales would be one of the key issues. Rice contest held in 2019 and 2020, supported by the USR grant, provided an efficient way for promoting the marketing of natural farming rice. Quality of rice produced by natural farming was judged by scientific analyses. Examination of levels of heavy metals (copper, lead, and cadmium), inorganic arsenic, total proteins (for checking the possibility of misuse of nitrogen), and palatability characteristics, determined the quality without any prejudice. Interestingly, competing rice was all of high quality. More importantly, sales in the past two years were thereby promoted.
Going back to the chemical pollution in soil, it has been known that inorganic arsenic often surpasses the nation’s standards, mostly due to the geological history of Taiwan. That is, the background level of arsenic, usually dissolved in water, in Taiwan’s environments tends to be high. For water growing rice, proper management is required. A USR class, in cooperating with the Dongshan Elementary School, invited Mr. Rongzong Li to demonstrate the water management in rice cultivation. The usefulness of the skills was revealed by the rice examined in the contest.
Natural farming with rice was mostly realized in the fields of Houbi District. Many young farmers joined the USR project and used the microbial materials developed by our team. At these farms, chemical fertilizers and pesticides are no more used. Nurtured with diverse bacteria and fungi, the soil has become soft, rich, and healthy, as further indicated by the increasing populations of earthworms and insects.
In addition, natural farming was also applied to the coffee farm in Dongshan District, where not only coffee but also oranges and longan are grown. After stopping the use of chemical fertilizers and herbicides, biodiversity has been recovered gradually. Quite many native, rare species were discovered in this area, including chrysidids, Eumenidae, pompilidae, Oxya chinesis, Odontomantis planiceps, Swinhoe's japalura, Sympis rufibasis. Most of them have been lost in farms of traditional agriculture for decades. Interestingly, chrysidids, an ancient insect, is an indicator of the ecological recovery.
(https://udn.com/news/story/7326/4786385?fbclid=IwAR0JeRlW45nY3fesosk9kQpNLm1bkLZL2-aB_ULrAklLcSAKGAPLB4-1YHo)
Members of our “food and agriculture education” class appreciated the diversity of plants, insects, and birds at the lands of natural farming. Surrounding by diverse insects and crested Serpent-eagle, members started to learn the harmony between human beings and environments.