[A long-term field trial on fertilization and on use of recycled nutrients in farming systems III. Recycling rate of P and N through a composting cycle and recoveries of P and N in organic manure].
The results from a nine years experiment indicated that the average loss rate of N and P contained in harvest products through a feeding-composting cycle was about 30%. Under high yield conditions, the amount of recycled N and P from 60% of harvested products and through a composting cycle in a farming system were about 55-70 kg.hm-2 and 9-11 kg.hm-2, respectively, equivalent to 37%-47% of N and 36%-44% of P from fertilizers applied every year to the system.
Yu
Wantai
W
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016. yuwantai@yahoo.com.cn
Zhang
Lu
L
Shen
Shanmin
S
Lian
Hongzhi
H
D000383:Agriculture / Q000379:methods*; D001673:Biodegradation, Environmental; D003247:Conservation of Natural Resources; D005308:Fertilizers; D008372:Manure / Q000032:analysis; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D012987:Soil / Q000032:analysis
D005308:Fertilizers; D008372:Manure; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen