The start date of this plan is March 31, 2011, and the plan’s recurring deadline is November 30, 2011. This year, 31 companies have been matched to give priority to promoting the use of biogas residue and biogas slurry as farmland fertilizer, and completed Submit 31 applications for biogas slurry and residue as farmland fertilizer to the Bureau of Agriculture for review, of which 22 are pig farms and 9 are cattle farms. In addition, 11 farms are located in the upper reaches of key measuring stations in the river basin under its jurisdiction (accounting for 35% of the total), including 6 cattle farms located in the Baweng dairy farming area, with a total irrigated area of 39.6789 hectares and an irrigation volume of 44,087 metric tons.
In 110 years, the groundwater demonstration households monitored 97 livestock farms, and the soil demonstration households monitored 98 livestock farms. The groundwater quality background value detection operation in the irrigated agricultural land area has completed 98 demonstration households (153 points), and the soil quality monitoring operation has been completed. 153 pieces of soil have been collected, of which 153 pieces of monitoring reports have been obtained. The monitoring results of the issued monitoring report show that the soil heavy metal - copper (Cu) meets or falls below the "85% limit of soil pollution monitoring standard (edible crop land)": 102 mg/kg; soil heavy metal - zinc (Zn) All met or were lower than the 85% limit of "Soil Pollution Monitoring Standard (Food Crops Farmland)": 221mg/kg. The results of soil conductivity monitoring, and this year, the second farm of Yongheng Livestock Farm (No. 180) is located in Qigu District, and the soil conductivity is affected by topography or regional factors, such as Qigu, Beimen and other coastal areas. , the background value before irrigation exceeds the irrigation stop benchmark. The team suggests that the livestock farm should first be required to reduce the irrigation amount (estimating the irrigation amount based on the minimum nitrogen demand of the crop), or increase the mixed irrigation ratio of groundwater to avoid soil Salinization, as a response measure, will continue to regularly monitor the changes in the soil conductivity concentration. If the farm has implemented reduced irrigation, but the soil conductivity is still on the rise, the relevant test data will be submitted to the Bureau of Agriculture for evaluation. Fill as.
At present, the groundwater quality background value of 98 fertilizer use plans has a total of 159 monitoring wells. As of November 17, 2010, a total of 159 monitoring wells have been monitored for investigation operations. The average concentration of ammonia nitrogen in Tainan groundwater is 2.29mg/L, the maximum The value is 16.4mg/L, and the minimum value is 0.03 mg/L. Among them, 19 groundwater wells have exceeded the standard for stopping irrigation as stipulated in the application letter. Further tracking and analysis, the average concentration of ammonia nitrogen in groundwater in recent years is 2.53mg/L, which is higher than the second category. Groundwater monitoring standard (0.25mg/L), especially in Yunlin, Chiayi, Tainan and other places that belong to the Jianan groundwater division, the ammonia nitrogen concentration in the groundwater is obviously high, and the ammonia nitrogen pollution potential in Tainan City and Kaohsiung City is much higher than other places area high.
From January to November this year, the total amount of irrigation applied was 188,294.77 metric tons, and the approved application for irrigation in the whole year was 264,217.9 metric tons per year. However, because most crops such as feed corn, rice, pomegranate and sweet potato, the fertilization period mostly falls in the Between summer and autumn, most of the crops in the first half of the year are in the fallow or harvest period, so the frequency and amount of irrigation are not high, and the amount of irrigation in the basal fertilizer period in May and June has an upward trend, but because the rainy season begins at the end of June, There is a lot of rainfall and the rainy season is long, so the increase in the amount of biogas slurry and residue irrigation in the second half of the year has slowed down. In the future, the industry and farmers will still be tracked regularly, and they will be required to fill in the irrigation record form.
Collected statistics from 2015 to 2019 Tainan has currently approved 118 biogas slurry and residue farmland fertilizer demonstration households, of which 58 are pig farms and 60 are cattle farms. Analysis of the watershed and administrative area distribution of 98 application farms, Tainan City currently has a total approved irrigation area of 188.97 hectares, with an irrigation volume of 264,217.9 metric tons per year, and about 11,173 pigs and 4,656 cattle. It is estimated that biological oxygen demand (BOD) and suspended solids (SS) can be reduced. ), ammonia nitrogen (NH3-N) and other pollutants, BOD is reduced by about 1,253.16 metric tons/year, SS is reduced by about 2,732.41 metric tons/year, and NH3-N is reduced by about 188.36 metric tons/year, which helps to improve river pollution; irrigation The crops on the farmland are mainly pennisetum, green cut corn and fodder corn.