Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (7): 1690-1698.DOI: 10.3969/j.issn.1004-1524.20226908

• Environmental Science • Previous Articles     Next Articles

Nutrients characteristics of pig manure in large-scale farms and effect of filler addition during composting

PAN Yajie(), CHANG Huiqing(), SONG Panpan   

  1. College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
  • Received:2022-06-20 Online:2023-07-25 Published:2023-08-17
  • Contact: CHANG Huiqing

Abstract:

Based on the survey of nutrients contents in the pig manure of large-scale farms, the effect of fillers on nutrients changes during composting was investigated to provide basis for the maintenance of nutrients, especially nitrogen. The dehydrated pig manure from typical pig farms in the western Henan Province was selected, and its nutrients contents were consecutively monitored for 171 d. Then, the effects of fillers (calcium superphosphate, bentonite, humus) addition on nutrients changes during the 90-d composting were studied. It was shown that the contents of total nitrogen (TN), P2O5, K2O, and organic matter in the pig manure samples ranged from 0.54% to 1.52%, 1.20% to 3.35%, 0.31% to 0.84%, and 54.03% to 79.70%, respectively, and the pH and electrical conductivity (EC) were 6.79 to 8.14, and 0.59 to 2.62 mS·cm-1, respectively. Aerobic composting could achieve harmless composting of pig manure, as the period with temperature>50 ℃ exceeded 7 d. Addition of 3% calcium superphosphate or 3% humus could increase the reaction temperature during composting, as the maximum temperature reached 62.7 ℃ and 58.9 ℃, and the high temperature (>50 ℃) period lasted 15 d and 16 d, respectively. The contents of TN, P2O5, and K2O during composting increased, yet the organic matter content showed a decreasing trend. Compared with the other treatments, the addition of 3% calcium superphosphate or 3% humus better maintained nitrogen during composting, of which the TN content was 1.63% and 1.75%, respectively, after composting. It was concluded that fillers should be added according to the nutrients contents in pig manure for composting. Under the experiment conditions, humus and calcium superphosphate are recommended to preserve total nitrogen during composting.

Key words: large-scale pig farm, manure, nutrients, aerobic composting

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