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low dose. WS biochar− high dose. No amendment control. pH−adjusted control. WS biochar− low dose. WS biochar− hi
en

am

d co me nt nt ro l pH −a dj u co ste nt d ro l W S b lo ioc w ha do r− se W S hi bio gh ch do ar− se

o

N

en

am

d co me nt nt ro l pH −a dj u co ste nt d ro l W S b lo ioc w ha do r− se W S hi bio gh ch do ar− se

o

N

Nodule number per plant

Sand Yolo silt loam

Biochar dose (%)

100 0 1 2.5

Treatment

pH Adjusted No Yes

50

0