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| Potential for the environmental carrying capacity of livestock and poultry breeding to substitute organic fertilizers in Hainan Province, China |
| Received:June 13, 2019 |
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| KeyWord:livestock manure;nutrients;agricultural land;carrying capacity;alternative fertilizer potential |
| Author Name | Affiliation | E-mail | | YANG Xu | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | | | HUANG Yan-yan | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | | | LIU Hai-lin | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | | | CHA Zheng-zao | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | | | LUO Wei | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | | | LIN Qing-huo | Rubber Research Institute, CATAS/State Key Laboratory Incubation Base for Cultivation&Physiology of Tropical Crops, Haikou 571101, China | qinghuol@163.com |
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| Abstract: |
| The objectives of the study are to evaluate the risks of fertilizers on agricultural lands, the potential of the environmental carrying capacity of livestock and poultry breeding, and the possible replacements for fertilizers in Hainan Province. Based on the 2017 breeding data measured in Hainan, the excretion coefficient method and crop grain ratio were used to calculate the total amounts of nitrogen, phosphorus, and potassium in livestock manure and straw. We analyzed the environmental carrying capacity, environmental pollution of livestock and poultry, and potential for organic fertilizers to replace chemical fertilizers with different returning proportions in Hainan. Results showed that in 2017 the total amount of livestock and poultry excrement in Hainan was 11.109 million tons. When the livestock manure was returned to agricultural fields, the aquaculture carrying capacity in the province was the equivalent of 675.15 million pigs. The pollution risks of the agricultural lands in Ding'an County and Haikou were relatively high at 0.98 and 0.81, respectively. The total nutrient content (nitrogen, phosphorus, and potassium) in the straw and livestock manure in Hainan was 145 000 tons. When the proportions of nutrients returning to fields were1/3,2/3,and 100%, respectively, the replacement potentials of the organic fertilizers were 4.2%, 7.1%, and 14.1%. The results have shown that currently there are no environmental pollution risks from livestock and poultry breeding in most areas in Hainan. In addition, there is a large breeding space and the potential for fertilizer replacement. |
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