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. 2014 Sep 29;9(9):e108594. doi: 10.1371/journal.pone.0108594

Table 1. Mean application rates of mineral and organic fertilizers (kg/ha/yr) per treatment.

Treatment N P2O5 K2O Wheat straw Pig manure Cattle manure
CK 0 0 0 0 0 0
NPK 180 90 135 0 0 0
NPKW1/2 180 90 135 2500 0 0
NPKW 180 90 135 5000 0 0
NPKPM 180 90 135 0 7800 0
NPKCM 180 90 135 0 0 12500

Treatments were no fertilization (CK), mineral NPK fertilizers alone (NPK), mineral NPK fertilizers combined with 2.5 ton/ha/yr of wheat straw (NPKW1/2), mineral NPK fertilizers combined with 5.0 ton/ha/yr of wheat straw (NPKW), mineral NPK fertilizers combined with pig manure (NPKPM), and mineral NPK fertilizers combined with cattle manure (NPKCM).